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Message-ID: <20140922110254.GA4510@pd.tnic>
Date: Mon, 22 Sep 2014 13:02:54 +0200
From: Borislav Petkov <bp@...en8.de>
To: Sasha Levin <sasha.levin@...cle.com>
Cc: Al Viro <viro@...IV.linux.org.uk>,
linux-fsdevel <linux-fsdevel@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Dave Jones <davej@...hat.com>, x86-ml <x86@...nel.org>,
Peter Zijlstra <peterz@...radead.org>
Subject: Re: fs: INFO: possible irq lock inversion dependency detected in
kill_fasync
On Thu, Sep 18, 2014 at 04:17:28PM -0400, Sasha Levin wrote:
> Ping?
>
> On 09/03/2014 08:52 AM, Sasha Levin wrote:
> > Ping? Still seeing it in -next.
> >
> > On 08/18/2014 08:24 PM, Sasha Levin wrote:
> >> Hi all,
> >>
> >> While fuzzing with trinity inside a KVM tools guest running the latest -next
> >> kernel, I've stumbled on the following spew:
I get a similar splat with rc5+ + tip/master during simple boot. Adding
more people to CC and leaving in the rest for reference.
[ 13.627241] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 17.598601] sha256_ssse3: Using AVX optimized SHA-256 implementation
[ 36.527009] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 54.867814] tun: Universal TUN/TAP device driver, 1.6
[ 54.872924] tun: (C) 1999-2004 Max Krasnyansky <maxk@...lcomm.com>
[ 646.712953]
[ 646.714454] =========================================================
[ 646.720887] [ INFO: possible irq lock inversion dependency detected ]
[ 646.727326] 3.17.0-rc5+ #1 Not tainted
[ 646.731076] ---------------------------------------------------------
[ 646.737511] swapper/6/0 just changed the state of lock:
[ 646.742733] (tasklist_lock){.?.+..}, at: [<ffffffff811894eb>] send_sigio+0x5b/0x1b0
[ 646.750539] but this lock took another, HARDIRQ-unsafe lock in the past:
[ 646.757233] (&(&p->alloc_lock)->rlock){+.+...}
[ 646.757233]
[ 646.757233] and interrupts could create inverse lock ordering between them.
[ 646.757233]
[ 646.767783]
[ 646.767783] other info that might help us debug this:
[ 646.774306] Possible interrupt unsafe locking scenario:
[ 646.774306]
[ 646.781088] CPU0 CPU1
[ 646.785619] ---- ----
[ 646.790147] lock(&(&p->alloc_lock)->rlock);
[ 646.794550] local_irq_disable();
[ 646.800465] lock(tasklist_lock);
[ 646.806406] lock(&(&p->alloc_lock)->rlock);
[ 646.813302] <Interrupt>
[ 646.815926] lock(tasklist_lock);
[ 646.819530]
[ 646.819530] *** DEADLOCK ***
[ 646.819530]
[ 646.825447] 7 locks held by swapper/6/0:
[ 646.829369] #0: (&(&dev->event_lock)->rlock){-.....}, at: [<ffffffff8149959d>] input_event+0x4d/0x90
[ 646.838752] #1: (rcu_read_lock){......}, at: [<ffffffff814986f5>] input_pass_values.part.3+0x5/0x360
[ 646.848175] #2: (rcu_read_lock){......}, at: [<ffffffff8149e995>] evdev_events+0x5/0x2d0
[ 646.856524] #3: (&(&client->buffer_lock)->rlock){-.....}, at: [<ffffffff8149db3c>] evdev_pass_values+0x5c/0x1c0
[ 646.866868] #4: (rcu_read_lock){......}, at: [<ffffffff8118964f>] kill_fasync+0xf/0x290
[ 646.875140] #5: (&(&new->fa_lock)->rlock){-.....}, at: [<ffffffff811896d6>] kill_fasync+0x96/0x290
[ 646.884365] #6: (&f->f_owner.lock){.-....}, at: [<ffffffff811894b4>] send_sigio+0x24/0x1b0
[ 646.892889]
[ 646.892889] the shortest dependencies between 2nd lock and 1st lock:
[ 646.900758] -> (&(&p->alloc_lock)->rlock){+.+...} ops: 46581 {
[ 646.906773] HARDIRQ-ON-W at:
[ 646.910013] [<ffffffff81099dc3>] __lock_acquire+0x973/0x23e0
[ 646.917602] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 646.924842] [<ffffffff8162cbb1>] _raw_spin_lock+0x41/0x80
[ 646.932169] [<ffffffff8117da99>] __set_task_comm+0x39/0x180
[ 646.939664] [<ffffffff810732d5>] kthreadd+0x45/0x150
[ 646.946556] [<ffffffff8162de6c>] ret_from_fork+0x7c/0xb0
[ 646.953790] SOFTIRQ-ON-W at:
[ 646.957037] [<ffffffff81099dfb>] __lock_acquire+0x9ab/0x23e0
[ 646.964618] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 646.971859] [<ffffffff8162cbb1>] _raw_spin_lock+0x41/0x80
[ 646.979188] [<ffffffff8117da99>] __set_task_comm+0x39/0x180
[ 646.986688] [<ffffffff810732d5>] kthreadd+0x45/0x150
[ 646.993583] [<ffffffff8162de6c>] ret_from_fork+0x7c/0xb0
[ 647.000824] INITIAL USE at:
[ 647.003987] [<ffffffff81099879>] __lock_acquire+0x429/0x23e0
[ 647.011487] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.018634] [<ffffffff8162cbb1>] _raw_spin_lock+0x41/0x80
[ 647.025875] [<ffffffff8117da99>] __set_task_comm+0x39/0x180
[ 647.033290] [<ffffffff810732d5>] kthreadd+0x45/0x150
[ 647.040097] [<ffffffff8162de6c>] ret_from_fork+0x7c/0xb0
[ 647.047244] }
[ 647.049003] ... key at: [<ffffffff81cc99b8>] __key.47962+0x0/0x8
[ 647.055638] ... acquired at:
[ 647.058694] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.064283] [<ffffffff8162cbb1>] _raw_spin_lock+0x41/0x80
[ 647.069964] [<ffffffff81066465>] do_prlimit+0x205/0x250
[ 647.075473] [<ffffffff810664da>] SyS_getrlimit+0x2a/0x70
[ 647.081058] [<ffffffff8162df16>] system_call_fastpath+0x16/0x1b
[ 647.087252]
[ 647.088744] -> (tasklist_lock){.?.+..} ops: 25047 {
[ 647.093714] IN-HARDIRQ-R at:
[ 647.096867] [<ffffffff81099ff9>] __lock_acquire+0xba9/0x23e0
[ 647.104275] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.111341] [<ffffffff8162d104>] _raw_read_lock+0x44/0x80
[ 647.118489] [<ffffffff811894eb>] send_sigio+0x5b/0x1b0
[ 647.125384] [<ffffffff81189704>] kill_fasync+0xc4/0x290
[ 647.132365] [<ffffffff8149db6d>] evdev_pass_values+0x8d/0x1c0
[ 647.139865] [<ffffffff8149eb9c>] evdev_events+0x20c/0x2d0
[ 647.147012] [<ffffffff81496a01>] input_to_handler+0x91/0x100
[ 647.154427] [<ffffffff814989b4>] input_pass_values.part.3+0x2c4/0x360
[ 647.162621] [<ffffffff814990ba>] input_handle_event+0xda/0x570
[ 647.170207] [<ffffffff814995b0>] input_event+0x60/0x90
[ 647.177094] [<ffffffff814cf86f>] hidinput_report_event+0x3f/0x50
[ 647.184847] [<ffffffff814cd9fe>] hid_report_raw_event+0x29e/0x440
[ 647.192687] [<ffffffff814cdcc1>] hid_input_report+0x121/0x1a0
[ 647.200188] [<ffffffff814db920>] hid_irq_in+0x80/0x1f0
[ 647.207073] [<ffffffff81455738>] __usb_hcd_giveback_urb+0x68/0x100
[ 647.214999] [<ffffffff8145581a>] usb_hcd_giveback_urb+0x4a/0x140
[ 647.222751] [<ffffffff81471d2b>] finish_urb+0x8b/0x150
[ 647.229638] [<ffffffff81473325>] ohci_work.part.32+0x345/0x5c0
[ 647.237216] [<ffffffff81476f10>] ohci_irq+0x200/0x280
[ 647.244017] [<ffffffff81454d45>] usb_hcd_irq+0x25/0x40
[ 647.250913] [<ffffffff810af669>] handle_irq_event_percpu+0x39/0x350
[ 647.258933] [<ffffffff810af9c8>] handle_irq_event+0x48/0x70
[ 647.266251] [<ffffffff810b2790>] handle_fasteoi_irq+0xa0/0x180
[ 647.273832] [<ffffffff81005692>] handle_irq+0x22/0x40
[ 647.280639] [<ffffffff81630908>] do_IRQ+0x68/0x110
[ 647.287181] [<ffffffff8162ebac>] ret_from_intr+0x0/0x13
[ 647.294162] [<ffffffff814c72a7>] cpuidle_enter+0x17/0x20
[ 647.301228] [<ffffffff810905e1>] cpu_startup_entry+0x461/0x570
[ 647.308809] [<ffffffff810360ed>] start_secondary+0x18d/0x1a0
[ 647.316224] HARDIRQ-ON-R at:
[ 647.319384] [<ffffffff810997c3>] __lock_acquire+0x373/0x23e0
[ 647.326790] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.333884] [<ffffffff8162d104>] _raw_read_lock+0x44/0x80
[ 647.341031] [<ffffffff810528f9>] do_wait+0xe9/0x370
[ 647.347656] [<ffffffff81052f95>] SyS_wait4+0x75/0xf0
[ 647.354369] [<ffffffff8162df16>] system_call_fastpath+0x16/0x1b
[ 647.362036] SOFTIRQ-ON-R at:
[ 647.365190] [<ffffffff81099dfb>] __lock_acquire+0x9ab/0x23e0
[ 647.372605] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.379671] [<ffffffff8162d104>] _raw_read_lock+0x44/0x80
[ 647.386842] [<ffffffff810528f9>] do_wait+0xe9/0x370
[ 647.393470] [<ffffffff81052f95>] SyS_wait4+0x75/0xf0
[ 647.400183] [<ffffffff8162df16>] system_call_fastpath+0x16/0x1b
[ 647.407850] INITIAL USE at:
[ 647.410932] [<ffffffff81099879>] __lock_acquire+0x429/0x23e0
[ 647.418253] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.425233] [<ffffffff8162d5c7>] _raw_write_lock_irq+0x47/0x80
[ 647.432726] [<ffffffff8104d3df>] copy_process.part.49+0xe7f/0x19f0
[ 647.440564] [<ffffffff8104e117>] do_fork+0xe7/0x770
[ 647.447114] [<ffffffff8104e7c6>] kernel_thread+0x26/0x30
[ 647.454087] [<ffffffff81621453>] rest_init+0x23/0x140
[ 647.460800] [<ffffffff81b9fe64>] start_kernel+0x404/0x411
[ 647.467867] [<ffffffff81b9f469>] x86_64_start_reservations+0x2a/0x2c
[ 647.475878] [<ffffffff81b9f562>] x86_64_start_kernel+0xf7/0xfb
[ 647.483374] }
[ 647.485045] ... key at: [<ffffffff8190f098>] tasklist_lock+0x18/0x80
[ 647.491940] ... acquired at:
[ 647.494911] [<ffffffff81095eb2>] check_usage_forwards+0x152/0x160
[ 647.501285] [<ffffffff81096c68>] mark_lock+0x3d8/0x760
[ 647.506700] [<ffffffff81099ff9>] __lock_acquire+0xba9/0x23e0
[ 647.512642] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.518236] [<ffffffff8162d104>] _raw_read_lock+0x44/0x80
[ 647.523910] [<ffffffff811894eb>] send_sigio+0x5b/0x1b0
[ 647.529324] [<ffffffff81189704>] kill_fasync+0xc4/0x290
[ 647.534833] [<ffffffff8149db6d>] evdev_pass_values+0x8d/0x1c0
[ 647.540852] [<ffffffff8149eb9c>] evdev_events+0x20c/0x2d0
[ 647.546526] [<ffffffff81496a01>] input_to_handler+0x91/0x100
[ 647.552460] [<ffffffff814989b4>] input_pass_values.part.3+0x2c4/0x360
[ 647.559174] [<ffffffff814990ba>] input_handle_event+0xda/0x570
[ 647.565287] [<ffffffff814995b0>] input_event+0x60/0x90
[ 647.570701] [<ffffffff814cf86f>] hidinput_report_event+0x3f/0x50
[ 647.576981] [<ffffffff814cd9fe>] hid_report_raw_event+0x29e/0x440
[ 647.583349] [<ffffffff814cdcc1>] hid_input_report+0x121/0x1a0
[ 647.589376] [<ffffffff814db920>] hid_irq_in+0x80/0x1f0
[ 647.594791] [<ffffffff81455738>] __usb_hcd_giveback_urb+0x68/0x100
[ 647.601244] [<ffffffff8145581a>] usb_hcd_giveback_urb+0x4a/0x140
[ 647.607523] [<ffffffff81471d2b>] finish_urb+0x8b/0x150
[ 647.612938] [<ffffffff81473325>] ohci_work.part.32+0x345/0x5c0
[ 647.619054] [<ffffffff81476f10>] ohci_irq+0x200/0x280
[ 647.624388] [<ffffffff81454d45>] usb_hcd_irq+0x25/0x40
[ 647.629803] [<ffffffff810af669>] handle_irq_event_percpu+0x39/0x350
[ 647.636350] [<ffffffff810af9c8>] handle_irq_event+0x48/0x70
[ 647.642198] [<ffffffff810b2790>] handle_fasteoi_irq+0xa0/0x180
[ 647.648312] [<ffffffff81005692>] handle_irq+0x22/0x40
[ 647.653632] [<ffffffff81630908>] do_IRQ+0x68/0x110
[ 647.658718] [<ffffffff8162ebac>] ret_from_intr+0x0/0x13
[ 647.664217] [<ffffffff814c72a7>] cpuidle_enter+0x17/0x20
[ 647.669812] [<ffffffff810905e1>] cpu_startup_entry+0x461/0x570
[ 647.675920] [<ffffffff810360ed>] start_secondary+0x18d/0x1a0
[ 647.681862]
[ 647.683359]
[ 647.683359] stack backtrace:
[ 647.687718] CPU: 6 PID: 0 Comm: swapper/6 Not tainted 3.17.0-rc5+ #1
[ 647.694065] Hardware name: To be filled by O.E.M. To be filled by O.E.M./M5A97 EVO R2.0, BIOS 1503 01/16/2013
[ 647.703968] ffffffff82814600 ffff88042e203648 ffffffff816257dc 0000000000000007
[ 647.711467] ffffffff82814600 ffff88042e203698 ffffffff81624b56 0000000000000002
[ 647.718933] ffffffff8184a8e7 ffff88042e203698 ffff88042b9ed678 ffff88042b9ecdc0
[ 647.726383] Call Trace:
[ 647.728828] <IRQ> [<ffffffff816257dc>] dump_stack+0x4f/0x7c
[ 647.734608] [<ffffffff81624b56>] print_irq_inversion_bug.part.31+0x1ba/0x1c9
[ 647.741737] [<ffffffff81095eb2>] check_usage_forwards+0x152/0x160
[ 647.747915] [<ffffffff81096c68>] mark_lock+0x3d8/0x760
[ 647.753135] [<ffffffff81095d60>] ? print_shortest_lock_dependencies+0x1d0/0x1d0
[ 647.760525] [<ffffffff81099ff9>] __lock_acquire+0xba9/0x23e0
[ 647.766268] [<ffffffff81099a13>] ? __lock_acquire+0x5c3/0x23e0
[ 647.772185] [<ffffffff8109c02e>] lock_acquire+0xbe/0x230
[ 647.777580] [<ffffffff811894eb>] ? send_sigio+0x5b/0x1b0
[ 647.782978] [<ffffffff8162d104>] _raw_read_lock+0x44/0x80
[ 647.788457] [<ffffffff811894eb>] ? send_sigio+0x5b/0x1b0
[ 647.793854] [<ffffffff811894eb>] send_sigio+0x5b/0x1b0
[ 647.799078] [<ffffffff811896d6>] ? kill_fasync+0x96/0x290
[ 647.804562] [<ffffffff81189704>] kill_fasync+0xc4/0x290
[ 647.809870] [<ffffffff8118964f>] ? kill_fasync+0xf/0x290
[ 647.815268] [<ffffffff8162cbdd>] ? _raw_spin_lock+0x6d/0x80
[ 647.820924] [<ffffffff8149db6d>] evdev_pass_values+0x8d/0x1c0
[ 647.826754] [<ffffffff8149eb9c>] evdev_events+0x20c/0x2d0
[ 647.832236] [<ffffffff8149e995>] ? evdev_events+0x5/0x2d0
[ 647.837719] [<ffffffff81496a01>] input_to_handler+0x91/0x100
[ 647.843462] [<ffffffff814989b4>] input_pass_values.part.3+0x2c4/0x360
[ 647.849984] [<ffffffff814986f5>] ? input_pass_values.part.3+0x5/0x360
[ 647.856509] [<ffffffff8162cda5>] ? _raw_spin_lock_irqsave+0x25/0x90
[ 647.862856] [<ffffffff8149959d>] ? input_event+0x4d/0x90
[ 647.868253] [<ffffffff814990ba>] input_handle_event+0xda/0x570
[ 647.874167] [<ffffffff8149959d>] ? input_event+0x4d/0x90
[ 647.879566] [<ffffffff814995b0>] input_event+0x60/0x90
[ 647.884788] [<ffffffff814cf86f>] hidinput_report_event+0x3f/0x50
[ 647.890878] [<ffffffff814cd9fe>] hid_report_raw_event+0x29e/0x440
[ 647.897053] [<ffffffff8162d011>] ? _raw_spin_unlock_irqrestore+0x41/0x90
[ 647.903838] [<ffffffff814cdcc1>] hid_input_report+0x121/0x1a0
[ 647.909666] [<ffffffff814db920>] hid_irq_in+0x80/0x1f0
[ 647.914890] [<ffffffff81455738>] __usb_hcd_giveback_urb+0x68/0x100
[ 647.921153] [<ffffffff8145581a>] usb_hcd_giveback_urb+0x4a/0x140
[ 647.927242] [<ffffffff81471d2b>] finish_urb+0x8b/0x150
[ 647.932464] [<ffffffff81473325>] ohci_work.part.32+0x345/0x5c0
[ 647.938380] [<ffffffff81476f10>] ohci_irq+0x200/0x280
[ 647.943518] [<ffffffff81454d45>] usb_hcd_irq+0x25/0x40
[ 647.948739] [<ffffffff810af669>] handle_irq_event_percpu+0x39/0x350
[ 647.955089] [<ffffffff810af9c8>] handle_irq_event+0x48/0x70
[ 647.960746] [<ffffffff810b2790>] handle_fasteoi_irq+0xa0/0x180
[ 647.966661] [<ffffffff81005692>] handle_irq+0x22/0x40
[ 647.971797] [<ffffffff81630908>] do_IRQ+0x68/0x110
[ 647.976673] [<ffffffff8162ebac>] common_interrupt+0x6c/0x6c
[ 647.982325] <EOI> [<ffffffff814c6f4b>] ? cpuidle_enter_state+0x7b/0x310
[ 647.989139] [<ffffffff814c6f46>] ? cpuidle_enter_state+0x76/0x310
[ 647.995314] [<ffffffff814c72a7>] cpuidle_enter+0x17/0x20
[ 648.000711] [<ffffffff810905e1>] cpu_startup_entry+0x461/0x570
[ 648.006628] [<ffffffff810ce52c>] ? clockevents_register_device+0xbc/0x120
[ 648.013496] [<ffffffff810360ed>] start_secondary+0x18d/0x1a0
> >>
> >> [ 1132.334973] =========================================================
> >> [ 1132.336095] [ INFO: possible irq lock inversion dependency detected ]
> >> [ 1132.337056] 3.16.0-next-20140815-sasha-00034-g615561b #1071 Not tainted
> >> [ 1132.337922] ---------------------------------------------------------
> >> [ 1132.340751] trinity-main/8521 just changed the state of lock:
> >> [ 1132.342015] (&(&new->fa_lock)->rlock){-.....}, at: kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] but this lock took another, HARDIRQ-unsafe lock in the past:
> >> [ 1132.342761] (&(&p->alloc_lock)->rlock){+.+...}
> >>
> >> and interrupts could create inverse lock ordering between them.
> >>
> >> [ 1132.342761]
> >> [ 1132.342761] other info that might help us debug this:
> >> [ 1132.342761] Chain exists of:
> >> &(&new->fa_lock)->rlock --> &f->f_owner.lock --> &(&p->alloc_lock)->rlock
> >> [ 1132.334973] =========================================================
> >> [ 1132.336095] [ INFO: possible irq lock inversion dependency detected ]
> >> [ 1132.337056] 3.16.0-next-20140815-sasha-00034-g615561b #1071 Not tainted
> >> [ 1132.337922] ---------------------------------------------------------
> >> [ 1132.340751] trinity-main/8521 just changed the state of lock:
> >> [ 1132.342015] (&(&new->fa_lock)->rlock){-.....}, at: kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] but this lock took another, HARDIRQ-unsafe lock in the past:
> >> [ 1132.342761] (&(&p->alloc_lock)->rlock){+.+...}
> >>
> >> and interrupts could create inverse lock ordering between them.
> >>
> >> [ 1132.342761]
> >> [ 1132.342761] other info that might help us debug this:
> >> [ 1132.342761] Chain exists of:
> >> &(&new->fa_lock)->rlock --> &f->f_owner.lock --> &(&p->alloc_lock)->rlock
> >>
> >> [ 1132.342761] Possible interrupt unsafe locking scenario:
> >> [ 1132.342761]
> >> [ 1132.342761] CPU0 CPU1
> >> [ 1132.342761] ---- ----
> >> [ 1132.342761] lock(&(&p->alloc_lock)->rlock);
> >> [ 1132.342761] local_irq_disable();
> >> [ 1132.342761] lock(&(&new->fa_lock)->rlock);
> >> [ 1132.342761] lock(&f->f_owner.lock);
> >> [ 1132.342761] <Interrupt>
> >> [ 1132.342761] lock(&(&new->fa_lock)->rlock);
> >> [ 1132.342761]
> >> [ 1132.342761] *** DEADLOCK ***
> >> [ 1132.342761]
> >> [ 1132.342761] 1 lock held by trinity-main/8521:
> >> [ 1132.342761] #0: (rcu_read_lock){......}, at: kill_fasync (fs/fcntl.c:731)
> >> [ 1132.342761]
> >> [ 1132.342761] the shortest dependencies between 2nd lock and 1st lock:
> >> [ 1132.342761] -> (&(&p->alloc_lock)->rlock){+.+...} ops: 737341 {
> >> [ 1132.342761] HARDIRQ-ON-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2802 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] SOFTIRQ-ON-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.51842 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] do_prlimit (kernel/sys.c:1386)
> >> [ 1132.342761] SyS_getrlimit (kernel/sys.c:1276 kernel/sys.c:1270)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (tasklist_lock){.+.+..} ops: 42693178 {
> >> [ 1132.342761] HARDIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2794 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] do_wait (./arch/x86/include/asm/current.h:14 kernel/exit.c:1490)
> >> [ 1132.342761] SyS_wait4 (kernel/exit.c:1620 kernel/exit.c:1588)
> >> [ 1132.342761] wait_for_helper (kernel/kmod.c:310)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] SOFTIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] do_wait (./arch/x86/include/asm/current.h:14 kernel/exit.c:1490)
> >> [ 1132.342761] SyS_wait4 (kernel/exit.c:1620 kernel/exit.c:1588)
> >> [ 1132.342761] wait_for_helper (kernel/kmod.c:310)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_write_lock_irq (include/linux/rwlock_api_smp.h:197 kernel/locking/spinlock.c:311)
> >> [ 1132.342761] copy_process (./arch/x86/include/asm/current.h:14 kernel/fork.c:1465)
> >> [ 1132.342761] do_fork (kernel/fork.c:1644)
> >> [ 1132.342761] kernel_thread (kernel/fork.c:1693)
> >> [ 1132.342761] rest_init (init/main.c:404)
> >> [ 1132.342761] start_kernel (init/main.c:682)
> >> [ 1132.342761] x86_64_start_reservations (arch/x86/kernel/head64.c:194)
> >> [ 1132.342761] x86_64_start_kernel (arch/x86/kernel/head64.c:183)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: tasklist_lock (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] send_sigio (fs/fcntl.c:517)
> >> [ 1132.342761] dnotify_handle_event (fs/notify/dnotify/dnotify.c:114)
> >> [ 1132.342761] send_to_group (fs/notify/fsnotify.c:183)
> >> [ 1132.342761] fsnotify (fs/notify/fsnotify.c:249)
> >> [ 1132.342761] notify_change (fs/attr.c:272)
> >> [ 1132.342761] chown_common (fs/open.c:581)
> >> [ 1132.342761] SyS_fchown (fs/open.c:647 fs/open.c:634)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (&f->f_owner.lock){.+.+..} ops: 5967 {
> >> [ 1132.342761] HARDIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2794 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] SOFTIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.31497 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] send_sigio (fs/fcntl.c:506)
> >> [ 1132.342761] kill_fasync (include/linux/spinlock.h:364 fs/fcntl.c:725 fs/fcntl.c:737)
> >> [ 1132.342761] wakeup_pipe_writers (fs/splice.c:727)
> >> [ 1132.342761] iter_file_splice_write (fs/splice.c:861 fs/splice.c:1054)
> >> [ 1132.342761] SyS_splice (fs/splice.c:1128 fs/splice.c:1393 fs/splice.c:1701 fs/splice.c:1684)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (&(&new->fa_lock)->rlock){-.....} ops: 4993 {
> >> [ 1132.342761] IN-HARDIRQ-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irq (include/linux/spinlock_api_smp.h:129 kernel/locking/spinlock.c:167)
> >> [ 1132.342761] fasync_remove_entry (include/linux/spinlock.h:359 fs/fcntl.c:595)
> >> [ 1132.342761] fasync_helper (fs/fcntl.c:698)
> >> [ 1132.342761] sock_fasync (net/socket.c:1211 (discriminator 7))
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:70 fs/fcntl.c:274 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.37041 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] check_usage_forwards (kernel/locking/lockdep.c:2364)
> >> [ 1132.342761] mark_lock (kernel/locking/lockdep.c:2474 kernel/locking/lockdep.c:2922)
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761]
> >> [ 1132.342761]
> >> [ 1132.342761] stack backtrace:
> >> [ 1132.342761] CPU: 10 PID: 8521 Comm: trinity-main Not tainted 3.16.0-next-20140815-sasha-00034-g615561b #1071
> >> [ 1132.342761] ffff88071c003cb0 ffff88071c003c48 ffffffffb24a9798 ffffffffb651ed80
> >> [ 1132.342761] ffff88071c003c90 ffffffffaf1cb19b ffff880714273d20 ffffffffb3740742
> >> [ 1132.342761] ffff880714273000 ffffffffb3740742 ffff880714273d20 0000000000000002
> >> [ 1132.342761] Call Trace:
> >> [ 1132.342761] <IRQ> dump_stack (lib/dump_stack.c:52)
> >> [ 1132.342761] print_irq_inversion_bug (kernel/locking/lockdep.c:2339)
> >> [ 1132.342761] check_usage_forwards (kernel/locking/lockdep.c:2364)
> >> [ 1132.342761] mark_lock (kernel/locking/lockdep.c:2474 kernel/locking/lockdep.c:2922)
> >> [ 1132.342761] ? print_irq_inversion_bug (kernel/locking/lockdep.c:2349)
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] ? kvm_clock_read (./arch/x86/include/asm/preempt.h:90 arch/x86/kernel/kvmclock.c:86)
> >> [ 1132.342761] ? sched_clock (./arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:304)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.564837] FAULT_INJECTION: forcing a failure
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:731)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] ? perf_event_reset (kernel/events/core.c:4337)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] <EOI> ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/paravirt.h:809 include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:191)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] ? context_tracking_user_exit (./arch/x86/include/asm/paravirt.h:809 (discriminator 2) kernel/context_tracking.c:184 (discriminator 2))
> >> [ 1132.342761] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
> >> [ 1132.342761] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2559 kernel/locking/lockdep.c:2601)
> >> [ 1132.342761] ? trace_hardirqs_on (kernel/locking/lockdep.c:2609)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761] ? tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] Possible interrupt unsafe locking scenario:
> >> [ 1132.342761]
> >> [ 1132.342761] CPU0 CPU1
> >> [ 1132.342761] ---- ----
> >> [ 1132.342761] lock(&(&p->alloc_lock)->rlock);
> >> [ 1132.342761] local_irq_disable();
> >> [ 1132.342761] lock(&(&new->fa_lock)->rlock);
> >> [ 1132.342761] lock(&f->f_owner.lock);
> >> [ 1132.342761] <Interrupt>
> >> [ 1132.342761] lock(&(&new->fa_lock)->rlock);
> >> [ 1132.342761]
> >> [ 1132.342761] *** DEADLOCK ***
> >> [ 1132.342761]
> >> [ 1132.342761] 1 lock held by trinity-main/8521:
> >> [ 1132.342761] #0: (rcu_read_lock){......}, at: kill_fasync (fs/fcntl.c:731)
> >> [ 1132.342761]
> >> [ 1132.342761] the shortest dependencies between 2nd lock and 1st lock:
> >> [ 1132.342761] -> (&(&p->alloc_lock)->rlock){+.+...} ops: 737341 {
> >> [ 1132.342761] HARDIRQ-ON-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2802 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] SOFTIRQ-ON-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] __set_task_comm (include/linux/spinlock.h:309 include/linux/jump_label.h:114 include/trace/events/task.h:33 fs/exec.c:1048)
> >> [ 1132.342761] kthreadd (kernel/kthread.c:489)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.51842 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock (include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:151)
> >> [ 1132.342761] do_prlimit (kernel/sys.c:1386)
> >> [ 1132.342761] SyS_getrlimit (kernel/sys.c:1276 kernel/sys.c:1270)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (tasklist_lock){.+.+..} ops: 42693178 {
> >> [ 1132.342761] HARDIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2794 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] do_wait (./arch/x86/include/asm/current.h:14 kernel/exit.c:1490)
> >> [ 1132.342761] SyS_wait4 (kernel/exit.c:1620 kernel/exit.c:1588)
> >> [ 1132.342761] wait_for_helper (kernel/kmod.c:310)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] SOFTIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] do_wait (./arch/x86/include/asm/current.h:14 kernel/exit.c:1490)
> >> [ 1132.342761] SyS_wait4 (kernel/exit.c:1620 kernel/exit.c:1588)
> >> [ 1132.342761] wait_for_helper (kernel/kmod.c:310)
> >> [ 1132.342761] ret_from_fork (arch/x86/kernel/entry_64.S:348)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_write_lock_irq (include/linux/rwlock_api_smp.h:197 kernel/locking/spinlock.c:311)
> >> [ 1132.342761] copy_process (./arch/x86/include/asm/current.h:14 kernel/fork.c:1465)
> >> [ 1132.342761] do_fork (kernel/fork.c:1644)
> >> [ 1132.342761] kernel_thread (kernel/fork.c:1693)
> >> [ 1132.342761] rest_init (init/main.c:404)
> >> [ 1132.342761] start_kernel (init/main.c:682)
> >> [ 1132.342761] x86_64_start_reservations (arch/x86/kernel/head64.c:194)
> >> [ 1132.342761] x86_64_start_kernel (arch/x86/kernel/head64.c:183)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: tasklist_lock (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] send_sigio (fs/fcntl.c:517)
> >> [ 1132.342761] dnotify_handle_event (fs/notify/dnotify/dnotify.c:114)
> >> [ 1132.342761] send_to_group (fs/notify/fsnotify.c:183)
> >> [ 1132.342761] fsnotify (fs/notify/fsnotify.c:249)
> >> [ 1132.342761] notify_change (fs/attr.c:272)
> >> [ 1132.342761] chown_common (fs/open.c:581)
> >> [ 1132.342761] SyS_fchown (fs/open.c:647 fs/open.c:634)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (&f->f_owner.lock){.+.+..} ops: 5967 {
> >> [ 1132.342761] HARDIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2794 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] SOFTIRQ-ON-R at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2806 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:197 fs/fcntl.c:308 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.31497 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_read_lock (include/linux/rwlock_api_smp.h:150 kernel/locking/spinlock.c:223)
> >> [ 1132.342761] send_sigio (fs/fcntl.c:506)
> >> [ 1132.342761] kill_fasync (include/linux/spinlock.h:364 fs/fcntl.c:725 fs/fcntl.c:737)
> >> [ 1132.342761] wakeup_pipe_writers (fs/splice.c:727)
> >> [ 1132.342761] iter_file_splice_write (fs/splice.c:861 fs/splice.c:1054)
> >> [ 1132.342761] SyS_splice (fs/splice.c:1128 fs/splice.c:1393 fs/splice.c:1701 fs/splice.c:1684)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761]
> >> [ 1132.342761] -> (&(&new->fa_lock)->rlock){-.....} ops: 4993 {
> >> [ 1132.342761] IN-HARDIRQ-W at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761] INITIAL USE at:
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:3144)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irq (include/linux/spinlock_api_smp.h:129 kernel/locking/spinlock.c:167)
> >> [ 1132.342761] fasync_remove_entry (include/linux/spinlock.h:359 fs/fcntl.c:595)
> >> [ 1132.342761] fasync_helper (fs/fcntl.c:698)
> >> [ 1132.342761] sock_fasync (net/socket.c:1211 (discriminator 7))
> >> [ 1132.342761] SyS_fcntl (fs/fcntl.c:70 fs/fcntl.c:274 fs/fcntl.c:378 fs/fcntl.c:363)
> >> [ 1132.342761] tracesys (arch/x86/kernel/entry_64.S:541)
> >> [ 1132.342761] }
> >> [ 1132.342761] ... key at: __key.37041 (??:?)
> >> [ 1132.342761] ... acquired at:
> >> [ 1132.342761] check_usage_forwards (kernel/locking/lockdep.c:2364)
> >> [ 1132.342761] mark_lock (kernel/locking/lockdep.c:2474 kernel/locking/lockdep.c:2922)
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761]
> >> [ 1132.342761]
> >> [ 1132.342761] stack backtrace:
> >> [ 1132.342761] CPU: 10 PID: 8521 Comm: trinity-main Not tainted 3.16.0-next-20140815-sasha-00034-g615561b #1071
> >> [ 1132.342761] ffff88071c003cb0 ffff88071c003c48 ffffffffb24a9798 ffffffffb651ed80
> >> [ 1132.342761] ffff88071c003c90 ffffffffaf1cb19b ffff880714273d20 ffffffffb3740742
> >> [ 1132.342761] ffff880714273000 ffffffffb3740742 ffff880714273d20 0000000000000002
> >> [ 1132.342761] Call Trace:
> >> [ 1132.342761] <IRQ> dump_stack (lib/dump_stack.c:52)
> >> [ 1132.342761] print_irq_inversion_bug (kernel/locking/lockdep.c:2339)
> >> [ 1132.342761] check_usage_forwards (kernel/locking/lockdep.c:2364)
> >> [ 1132.342761] mark_lock (kernel/locking/lockdep.c:2474 kernel/locking/lockdep.c:2922)
> >> [ 1132.342761] ? print_irq_inversion_bug (kernel/locking/lockdep.c:2349)
> >> [ 1132.342761] __lock_acquire (kernel/locking/lockdep.c:2785 kernel/locking/lockdep.c:3140)
> >> [ 1132.342761] ? kvm_clock_read (./arch/x86/include/asm/preempt.h:90 arch/x86/kernel/kvmclock.c:86)
> >> [ 1132.342761] ? sched_clock (./arch/x86/include/asm/paravirt.h:192 arch/x86/kernel/tsc.c:304)
> >> [ 1132.342761] lock_acquire (./arch/x86/include/asm/current.h:14 kernel/locking/lockdep.c:3610)
> >> [ 1132.564837] FAULT_INJECTION: forcing a failure
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:117 kernel/locking/spinlock.c:159)
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] kill_fasync (fs/fcntl.c:717 fs/fcntl.c:737)
> >> [ 1132.342761] ? kill_fasync (fs/fcntl.c:731)
> >> [ 1132.342761] perf_event_wakeup (kernel/events/core.c:4342)
> >> [ 1132.342761] ? perf_event_reset (kernel/events/core.c:4337)
> >> [ 1132.342761] perf_pending_event (kernel/events/core.c:4360)
> >> [ 1132.342761] irq_work_run_list (kernel/irq_work.c:159)
> >> [ 1132.342761] irq_work_run (kernel/irq_work.c:170)
> >> [ 1132.342761] smp_irq_work_interrupt (./arch/x86/include/asm/apic.h:660 arch/x86/kernel/irq_work.c:29)
> >> [ 1132.342761] irq_work_interrupt (arch/x86/kernel/entry_64.S:1046)
> >> [ 1132.342761] <EOI> ? _raw_spin_unlock_irqrestore (./arch/x86/include/asm/paravirt.h:809 include/linux/spinlock_api_smp.h:160 kernel/locking/spinlock.c:191)
> >> [ 1132.342761] wake_up_new_task (kernel/sched/core.c:2090)
> >> [ 1132.342761] do_fork (kernel/fork.c:1671)
> >> [ 1132.342761] ? context_tracking_user_exit (./arch/x86/include/asm/paravirt.h:809 (discriminator 2) kernel/context_tracking.c:184 (discriminator 2))
> >> [ 1132.342761] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63)
> >> [ 1132.342761] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2559 kernel/locking/lockdep.c:2601)
> >> [ 1132.342761] ? trace_hardirqs_on (kernel/locking/lockdep.c:2609)
> >> [ 1132.342761] SyS_clone (kernel/fork.c:1733)
> >> [ 1132.342761] stub_clone (arch/x86/kernel/entry_64.S:636)
> >> [ 1132.342761] ? tracesys (arch/x86/kernel/entry_64.S:541)
> >>
> >>
> >> Thanks,
> >> Sash
> >>
> >
>
> --
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>
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
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