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Date: Wed, 23 Jul 2014 11:53:27 +0200
From: Borislav Petkov <bp@...en8.de>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-usb@...r.kernel.org, linux-input@...r.kernel.org
Subject: Re: Linux 3.16-rc6
On Sun, Jul 20, 2014 at 09:22:52PM -0700, Linus Torvalds wrote:
> So go get the latest rc and kick the tires, to see that nothing has
> fallen through the cracks, ok?
Well, it looks like we f*cked up something after -rc5 since I'm starting
to see lockdep splats all over the place which I didn't see before. I'm
running rc6 + tip/master.
There was one in r8169 yesterday:
https://lkml.kernel.org/r/20140722081840.GA6462@pd.tnic
and now I'm seeing the following in a kvm guest. I'm adding some more
lists to CC which look like might be related, judging from the stack
traces.
---
...
[ 9.456211] EXT3-fs (sda1): using internal journal
[ 24.623666] 8139cp 0000:00:03.0 eth0: link up, 100Mbps, full-duplex, lpa 0x05E1
[ 28.346202] mtrr: no MTRR for fc000000,100000 found
[ 31.704053]
[ 31.704282] =========================================================
[ 31.704282] [ INFO: possible irq lock inversion dependency detected ]
[ 31.704282] 3.16.0-rc6+ #1 Not tainted
[ 31.704282] ---------------------------------------------------------
[ 31.704282] Xorg/3484 just changed the state of lock:
[ 31.704282] (tasklist_lock){.?.+..}, at: [<ffffffff81184b19>] send_sigio+0x59/0x1b0
[ 31.704282] but this lock took another, HARDIRQ-unsafe lock in the past:
[ 31.704282] (&(&p->alloc_lock)->rlock){+.+...}
and interrupts could create inverse lock ordering between them.
[ 31.704282]
[ 31.704282] other info that might help us debug this:
[ 31.704282] Possible interrupt unsafe locking scenario:
[ 31.704282]
[ 31.704282] CPU0 CPU1
[ 31.704282] ---- ----
[ 31.704282] lock(&(&p->alloc_lock)->rlock);
[ 31.704282] local_irq_disable();
[ 31.704282] lock(tasklist_lock);
[ 31.704282] lock(&(&p->alloc_lock)->rlock);
[ 31.704282] <Interrupt>
[ 31.704282] lock(tasklist_lock);
[ 31.704282]
[ 31.704282] *** DEADLOCK ***
[ 31.704282]
[ 31.704282] 7 locks held by Xorg/3484:
[ 31.704282] #0: (&(&dev->event_lock)->rlock){-.....}, at: [<ffffffff8148c20d>] input_event+0x4d/0x90
[ 31.704282] #1: (rcu_read_lock){......}, at: [<ffffffff8148b365>] input_pass_values.part.3+0x5/0x360
[ 31.704282] #2: (rcu_read_lock){......}, at: [<ffffffff814915a5>] evdev_events+0x5/0x2e0
[ 31.704282] #3: (&(&client->buffer_lock)->rlock){-.....}, at: [<ffffffff81490743>] evdev_pass_values+0x63/0x1d0
[ 31.704282] #4: (rcu_read_lock){......}, at: [<ffffffff81184c7f>] kill_fasync+0xf/0x290
[ 31.704282] #5: (&(&new->fa_lock)->rlock){-.....}, at: [<ffffffff81184d06>] kill_fasync+0x96/0x290
[ 31.704282] #6: (&f->f_owner.lock){.-....}, at: [<ffffffff81184ae4>] send_sigio+0x24/0x1b0
[ 31.704282]
[ 31.704282] the shortest dependencies between 2nd lock and 1st lock:
[ 31.704282] -> (&(&p->alloc_lock)->rlock){+.+...} ops: 35104 {
[ 31.704282] HARDIRQ-ON-W at:
[ 31.704282] [<ffffffff8109a362>] __lock_acquire+0x952/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161f8d1>] _raw_spin_lock+0x41/0x80
[ 31.704282] [<ffffffff811793c9>] __set_task_comm+0x39/0x180
[ 31.704282] [<ffffffff81073c35>] kthreadd+0x45/0x150
[ 31.704282] [<ffffffff81620b6c>] ret_from_fork+0x7c/0xb0
[ 31.704282] SOFTIRQ-ON-W at:
[ 31.704282] [<ffffffff8109a395>] __lock_acquire+0x985/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161f8d1>] _raw_spin_lock+0x41/0x80
[ 31.704282] [<ffffffff811793c9>] __set_task_comm+0x39/0x180
[ 31.704282] [<ffffffff81073c35>] kthreadd+0x45/0x150
[ 31.704282] [<ffffffff81620b6c>] ret_from_fork+0x7c/0xb0
[ 31.704282] INITIAL USE at:
[ 31.704282] [<ffffffff81099e53>] __lock_acquire+0x443/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161f8d1>] _raw_spin_lock+0x41/0x80
[ 31.704282] [<ffffffff811793c9>] __set_task_comm+0x39/0x180
[ 31.704282] [<ffffffff81073c35>] kthreadd+0x45/0x150
[ 31.704282] [<ffffffff81620b6c>] ret_from_fork+0x7c/0xb0
[ 31.704282] }
[ 31.704282] ... key at: [<ffffffff81cc4ae8>] __key.47760+0x0/0x8
[ 31.704282] ... acquired at:
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161f8d1>] _raw_spin_lock+0x41/0x80
[ 31.704282] [<ffffffff81066b45>] do_prlimit+0x205/0x250
[ 31.704282] [<ffffffff81066bba>] SyS_getrlimit+0x2a/0x70
[ 31.704282] [<ffffffff81620c16>] system_call_fastpath+0x1a/0x1f
[ 31.704282]
[ 31.704282] -> (tasklist_lock){.?.+..} ops: 22947 {
[ 31.704282] IN-HARDIRQ-R at:
[ 31.704282] [<ffffffff8109a5a3>] __lock_acquire+0xb93/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161fe14>] _raw_read_lock+0x44/0x80
[ 31.704282] [<ffffffff81184b19>] send_sigio+0x59/0x1b0
[ 31.704282] [<ffffffff81184d34>] kill_fasync+0xc4/0x290
[ 31.704282] [<ffffffff81490776>] evdev_pass_values+0x96/0x1d0
[ 31.704282] [<ffffffff814917bc>] evdev_events+0x21c/0x2e0
[ 31.704282] [<ffffffff81489691>] input_to_handler+0x91/0x100
[ 31.704282] [<ffffffff8148b624>] input_pass_values.part.3+0x2c4/0x360
[ 31.704282] [<ffffffff8148bd1a>] input_handle_event+0xda/0x580
[ 31.704282] [<ffffffff8148c220>] input_event+0x60/0x90
[ 31.704282] [<ffffffff814c546f>] hidinput_report_event+0x3f/0x50
[ 31.704282] [<ffffffff814c3635>] hid_report_raw_event+0x285/0x420
[ 31.704282] [<ffffffff814c38f1>] hid_input_report+0x121/0x1a0
[ 31.704282] [<ffffffff814d1300>] hid_irq_in+0x80/0x1f0
[ 31.704282] [<ffffffff81448c98>] __usb_hcd_giveback_urb+0x68/0x100
[ 31.704282] [<ffffffff81448d7a>] usb_hcd_giveback_urb+0x4a/0x140
[ 31.704282] [<ffffffff8146ba38>] uhci_giveback_urb+0xb8/0x210
[ 31.704282] [<ffffffff8146c4a2>] uhci_scan_schedule.part.32+0x542/0xb60
[ 31.704282] [<ffffffff8146d351>] uhci_irq+0xf1/0x190
[ 31.704282] [<ffffffff81448285>] usb_hcd_irq+0x25/0x40
[ 31.704282] [<ffffffff810af329>] handle_irq_event_percpu+0x39/0x350
[ 31.704282] [<ffffffff810af688>] handle_irq_event+0x48/0x70
[ 31.704282] [<ffffffff810b2a60>] handle_fasteoi_irq+0xa0/0x180
[ 31.704282] [<ffffffff810055ce>] handle_irq+0x1e/0x30
[ 31.704282] [<ffffffff81623618>] do_IRQ+0x68/0x110
[ 31.704282] [<ffffffff8162186f>] ret_from_intr+0x0/0x13
[ 31.704282] HARDIRQ-ON-R at:
[ 31.704282] [<ffffffff81099dac>] __lock_acquire+0x39c/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161fe14>] _raw_read_lock+0x44/0x80
[ 31.704282] [<ffffffff81053109>] do_wait+0xe9/0x370
[ 31.704282] [<ffffffff810537a5>] SyS_wait4+0x75/0xf0
[ 31.704282] [<ffffffff81067f0b>] wait_for_helper+0x4b/0x70
[ 31.704282] [<ffffffff81620b6c>] ret_from_fork+0x7c/0xb0
[ 31.704282] SOFTIRQ-ON-R at:
[ 31.704282] [<ffffffff8109a395>] __lock_acquire+0x985/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff8161fe14>] _raw_read_lock+0x44/0x80
[ 31.704282] [<ffffffff81053109>] do_wait+0xe9/0x370
[ 31.704282] [<ffffffff810537a5>] SyS_wait4+0x75/0xf0
[ 31.704282] [<ffffffff81067f0b>] wait_for_helper+0x4b/0x70
[ 31.704282] [<ffffffff81620b6c>] ret_from_fork+0x7c/0xb0
[ 31.704282] INITIAL USE at:
[ 31.704282] [<ffffffff81099e53>] __lock_acquire+0x443/0x2230
[ 31.704282] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 31.704282] [<ffffffff816202c7>] _raw_write_lock_irq+0x47/0x80
[ 31.704282] [<ffffffff8104dd5a>] copy_process.part.51+0xe5a/0x19d0
[ 31.704282] [<ffffffff8104ea97>] do_fork+0xe7/0x770
[ 31.704282] [<ffffffff8104f146>] kernel_thread+0x26/0x30
[ 31.704282] [<ffffffff81614922>] rest_init+0x22/0x140
[ 31.704282] [<ffffffff81b90e3e>] start_kernel+0x408/0x415
[ 31.704282] [<ffffffff81b90463>] x86_64_start_reservations+0x2a/0x2c
[ 31.704282] [<ffffffff81b9055b>] x86_64_start_kernel+0xf6/0xf9
[ 31.704282] }
[ 31.704282] ... key at: [<ffffffff818ff098>] tasklist_lock+0x18/0x80
[ 31.704282] ... acquired at:
[ 31.704282] [<ffffffff8109636b>] check_usage_forwards+0x15b/0x160
[ 31.704282] [<ffffffff81097188>] mark_lock+0x3d8/0x760
[ 32.044737] [<ffffffff8109a5a3>] __lock_acquire+0xb93/0x2230
[ 32.044737] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 32.044737] [<ffffffff8161fe14>] _raw_read_lock+0x44/0x80
[ 32.044737] [<ffffffff81184b19>] send_sigio+0x59/0x1b0
[ 32.044737] [<ffffffff81184d34>] kill_fasync+0xc4/0x290
[ 32.044737] [<ffffffff81490776>] evdev_pass_values+0x96/0x1d0
[ 32.044737] [<ffffffff814917bc>] evdev_events+0x21c/0x2e0
[ 32.044737] [<ffffffff81489691>] input_to_handler+0x91/0x100
[ 32.044737] [<ffffffff8148b624>] input_pass_values.part.3+0x2c4/0x360
[ 32.044737] [<ffffffff8148bd1a>] input_handle_event+0xda/0x580
[ 32.044737] [<ffffffff8148c220>] input_event+0x60/0x90
[ 32.044737] [<ffffffff814c546f>] hidinput_report_event+0x3f/0x50
[ 32.044737] [<ffffffff814c3635>] hid_report_raw_event+0x285/0x420
[ 32.044737] [<ffffffff814c38f1>] hid_input_report+0x121/0x1a0
[ 32.044737] [<ffffffff814d1300>] hid_irq_in+0x80/0x1f0
[ 32.044737] [<ffffffff81448c98>] __usb_hcd_giveback_urb+0x68/0x100
[ 32.044737] [<ffffffff81448d7a>] usb_hcd_giveback_urb+0x4a/0x140
[ 32.044737] [<ffffffff8146ba38>] uhci_giveback_urb+0xb8/0x210
[ 32.044737] [<ffffffff8146c4a2>] uhci_scan_schedule.part.32+0x542/0xb60
[ 32.044737] [<ffffffff8146d351>] uhci_irq+0xf1/0x190
[ 32.044737] [<ffffffff81448285>] usb_hcd_irq+0x25/0x40
[ 32.044737] [<ffffffff810af329>] handle_irq_event_percpu+0x39/0x350
[ 32.044737] [<ffffffff810af688>] handle_irq_event+0x48/0x70
[ 32.044737] [<ffffffff810b2a60>] handle_fasteoi_irq+0xa0/0x180
[ 32.044737] [<ffffffff810055ce>] handle_irq+0x1e/0x30
[ 32.044737] [<ffffffff81623618>] do_IRQ+0x68/0x110
[ 32.044737] [<ffffffff8162186f>] ret_from_intr+0x0/0x13
[ 32.044737]
[ 32.044737]
[ 32.044737] stack backtrace:
[ 32.044737] CPU: 0 PID: 3484 Comm: Xorg Not tainted 3.16.0-rc6+ #1
[ 32.044737] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
[ 32.044737] ffffffff8280ddc0 ffff88007be03770 ffffffff8161874e ffffffff8280ddc0
[ 32.044737] ffff88007be037b0 ffffffff81617b6f ffffffff8183b4f6 ffff880079da4300
[ 32.044737] ffff880079da3a50 ffffffff8183b4f6 0000000000000000 ffffffff8280ddc0
[ 32.044737] Call Trace:
[ 32.044737] <IRQ> [<ffffffff8161874e>] dump_stack+0x4e/0x7a
[ 32.044737] [<ffffffff81617b6f>] print_irq_inversion_bug.part.31+0x1b8/0x1c4
[ 32.044737] [<ffffffff8109636b>] check_usage_forwards+0x15b/0x160
[ 32.044737] [<ffffffff81097188>] mark_lock+0x3d8/0x760
[ 32.044737] [<ffffffff81096210>] ? print_shortest_lock_dependencies+0x1d0/0x1d0
[ 32.044737] [<ffffffff8109a5a3>] __lock_acquire+0xb93/0x2230
[ 32.044737] [<ffffffff8109c449>] lock_acquire+0xb9/0x200
[ 32.044737] [<ffffffff81184b19>] ? send_sigio+0x59/0x1b0
[ 32.044737] [<ffffffff8161fe14>] _raw_read_lock+0x44/0x80
[ 32.044737] [<ffffffff81184b19>] ? send_sigio+0x59/0x1b0
[ 32.044737] [<ffffffff81184b19>] send_sigio+0x59/0x1b0
[ 32.044737] [<ffffffff81184d34>] kill_fasync+0xc4/0x290
[ 32.044737] [<ffffffff81184c7f>] ? kill_fasync+0xf/0x290
[ 32.044737] [<ffffffff81490776>] evdev_pass_values+0x96/0x1d0
[ 32.044737] [<ffffffff814917bc>] evdev_events+0x21c/0x2e0
[ 32.044737] [<ffffffff814915a5>] ? evdev_events+0x5/0x2e0
[ 32.044737] [<ffffffff81489691>] input_to_handler+0x91/0x100
[ 32.044737] [<ffffffff8148b624>] input_pass_values.part.3+0x2c4/0x360
[ 32.044737] [<ffffffff8148b365>] ? input_pass_values.part.3+0x5/0x360
[ 32.044737] [<ffffffff8148bd1a>] input_handle_event+0xda/0x580
[ 32.044737] [<ffffffff8148c220>] input_event+0x60/0x90
[ 32.044737] [<ffffffff814c546f>] hidinput_report_event+0x3f/0x50
[ 32.044737] [<ffffffff814c3635>] hid_report_raw_event+0x285/0x420
[ 32.044737] [<ffffffff814c38f1>] hid_input_report+0x121/0x1a0
[ 32.044737] [<ffffffff814d1300>] hid_irq_in+0x80/0x1f0
[ 32.044737] [<ffffffff81448c98>] __usb_hcd_giveback_urb+0x68/0x100
[ 32.044737] [<ffffffff81448d7a>] usb_hcd_giveback_urb+0x4a/0x140
[ 32.044737] [<ffffffff8146ba38>] uhci_giveback_urb+0xb8/0x210
[ 32.044737] [<ffffffff8146c4a2>] uhci_scan_schedule.part.32+0x542/0xb60
[ 32.044737] [<ffffffff8146d2d2>] ? uhci_irq+0x72/0x190
[ 32.044737] [<ffffffff8146d351>] uhci_irq+0xf1/0x190
[ 32.044737] [<ffffffff81448285>] usb_hcd_irq+0x25/0x40
[ 32.044737] [<ffffffff810af329>] handle_irq_event_percpu+0x39/0x350
[ 32.044737] [<ffffffff810af688>] handle_irq_event+0x48/0x70
[ 32.044737] [<ffffffff810b2a60>] handle_fasteoi_irq+0xa0/0x180
[ 32.044737] [<ffffffff810055ce>] handle_irq+0x1e/0x30
[ 32.044737] [<ffffffff81623618>] do_IRQ+0x68/0x110
[ 32.044737] [<ffffffff8162186f>] common_interrupt+0x6f/0x6f
[ 32.044737] <EOI> [<ffffffff81621911>] ? retint_swapgs+0xe/0x13
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
--
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