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Date: Wed, 22 Oct 2014 20:46:27 +0200
From: Borislav Petkov <bp@...en8.de>
To: Jiri Kosina <jkosina@...e.cz>
Cc: Steven Rostedt <rostedt@...dmis.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
linux-pm@...r.kernel.org
Subject: Re: lockdep splat in CPU hotplug
On Wed, Oct 22, 2014 at 08:40:21PM +0200, Jiri Kosina wrote:
> Yes, it's 100% reliable for me.
FWIW, I see that same splat here too, after a suspend-to-disk run:
...
[60077.352314] PM: Hibernation mode set to 'shutdown'
[60077.467384] PM: Syncing filesystems ... done.
[60077.479538] Freezing user space processes ... (elapsed 0.003 seconds) done.
[60077.490367] PM: Marking nosave pages: [mem 0x00000000-0x00000fff]
[60077.496504] PM: Marking nosave pages: [mem 0x0009e000-0x000fffff]
[60077.502622] PM: Marking nosave pages: [mem 0xba9b8000-0xbca4dfff]
[60077.508843] PM: Marking nosave pages: [mem 0xbca4f000-0xbcc54fff]
[60077.514962] PM: Marking nosave pages: [mem 0xbd083000-0xbd7f3fff]
[60077.521088] PM: Marking nosave pages: [mem 0xbd800000-0x100000fff]
[60077.527846] PM: Basic memory bitmaps created
[60077.532122] PM: Preallocating image memory... done (allocated 988772 pages)
[60078.526047] PM: Allocated 3955088 kbytes in 0.98 seconds (4035.80 MB/s)
[60078.532681] Freezing remaining freezable tasks ... (elapsed 0.002 seconds) done.
[60078.545755] serial 00:06: disabled
[60078.546092] serial 00:06: System wakeup disabled by ACPI
[60080.973122] PM: freeze of devices complete after 2431.225 msecs
[60080.975511] PM: late freeze of devices complete after 2.206 msecs
[60080.980676] PM: noirq freeze of devices complete after 4.982 msecs
[60080.980877] Disabling non-boot CPUs ...
[60080.985500] smpboot: CPU 1 is now offline
[60080.990958] smpboot: CPU 2 is now offline
[60080.996340] smpboot: CPU 3 is now offline
[60081.003775] smpboot: CPU 4 is now offline
[60081.009236] smpboot: CPU 5 is now offline
[60081.017157] smpboot: CPU 6 is now offline
[60081.022512] smpboot: CPU 7 is now offline
[60081.025702] PM: Creating hibernation image:
[60082.243068] PM: Need to copy 1010324 pages
[60082.243219] PM: Normal pages needed: 1010324 + 1024, available pages: 3158476
[60081.301349] LVT offset 0 assigned for vector 0x400
[60081.302020] Enabling non-boot CPUs ...
[60081.302249] x86: Booting SMP configuration:
[60081.302378] smpboot: Booting Node 0 Processor 1 APIC 0x11
[60081.316879]
[60081.316933] ======================================================
[60081.317119] [ INFO: possible circular locking dependency detected ]
[60081.317308] 3.18.0-rc1+ #1 Not tainted
[60081.317423] -------------------------------------------------------
[60081.317640] hib.sh/2232 is trying to acquire lock:
[60081.317786] (cpuidle_lock){+.+.+.}, at: [<ffffffff814e3c67>] cpuidle_pause_and_lock+0x17/0x20
[60081.318070]
[60081.318070] but task is already holding lock:
[60081.318247] (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810516c8>] cpu_hotplug_begin+0x58/0x90
[60081.318537]
[60081.318537] which lock already depends on the new lock.
[60081.318537]
[60081.318810]
[60081.318810] the existing dependency chain (in reverse order) is:
[60081.319034]
[60081.319034] -> #1 (cpu_hotplug.lock#2){+.+.+.}:
[60081.319206] [<ffffffff8109f68d>] lock_acquire+0xdd/0x2d0
[60081.319391] [<ffffffff81644d2e>] mutex_lock_nested+0x5e/0x410
[60081.319589] [<ffffffff814e3e27>] cpuidle_pause+0x17/0x30
[60081.319774] [<ffffffff813fda8e>] dpm_suspend_noirq+0x6e/0x640
[60081.319999] [<ffffffff813fe6bf>] dpm_suspend_end+0x3f/0x90
[60081.320189] [<ffffffff810a8f61>] hibernation_snapshot+0xe1/0x790
[60081.320394] [<ffffffff810a9d5a>] hibernate+0x14a/0x1d0
[60081.320574] [<ffffffff810a59c4>] state_store+0xe4/0xf0
[60081.320755] [<ffffffff812f0f2f>] kobj_attr_store+0xf/0x20
[60081.320944] [<ffffffff811fbce0>] sysfs_kf_write+0x50/0x70
[60081.321131] [<ffffffff811fafe5>] kernfs_fop_write+0x105/0x190
[60081.321357] [<ffffffff8118335d>] vfs_write+0xbd/0x1d0
[60081.321534] [<ffffffff81183dc2>] SyS_write+0x52/0xc0
[60081.321709] [<ffffffff816490d6>] system_call_fastpath+0x16/0x1b
[60081.321912]
[60081.321912] -> #0 (cpuidle_lock){+.+.+.}:
[60081.322062] [<ffffffff8109e9a4>] __lock_acquire+0x2034/0x2410
[60081.322259] [<ffffffff8109f68d>] lock_acquire+0xdd/0x2d0
[60081.322472] [<ffffffff81644d2e>] mutex_lock_nested+0x5e/0x410
[60081.322669] [<ffffffff814e3c67>] cpuidle_pause_and_lock+0x17/0x20
[60081.322877] [<ffffffff8138032c>] acpi_processor_hotplug+0x4f/0x8d
[60081.323085] [<ffffffff8137e512>] acpi_cpu_soft_notify+0xb2/0xe8
[60081.323287] [<ffffffff81076255>] notifier_call_chain+0x55/0xb0
[60081.323487] [<ffffffff810762be>] __raw_notifier_call_chain+0xe/0x10
[60081.323727] [<ffffffff810515a3>] cpu_notify+0x23/0x40
[60081.323904] [<ffffffff810518a0>] _cpu_up+0x160/0x170
[60081.324079] [<ffffffff8163cda3>] enable_nonboot_cpus+0xf3/0x4b0
[60081.324282] [<ffffffff810a9165>] hibernation_snapshot+0x2e5/0x790
[60081.324489] [<ffffffff810a9d5a>] hibernate+0x14a/0x1d0
[60081.324669] [<ffffffff810a59c4>] state_store+0xe4/0xf0
[60081.324878] [<ffffffff812f0f2f>] kobj_attr_store+0xf/0x20
[60081.325066] [<ffffffff811fbce0>] sysfs_kf_write+0x50/0x70
[60081.325253] [<ffffffff811fafe5>] kernfs_fop_write+0x105/0x190
[60081.325450] [<ffffffff8118335d>] vfs_write+0xbd/0x1d0
[60081.325627] [<ffffffff81183dc2>] SyS_write+0x52/0xc0
[60081.325801] [<ffffffff816490d6>] system_call_fastpath+0x16/0x1b
[60081.326032]
[60081.326032] other info that might help us debug this:
[60081.326032]
[60081.326272] Possible unsafe locking scenario:
[60081.326272]
[60081.326451] CPU0 CPU1
[60081.326589] ---- ----
[60081.326726] lock(cpu_hotplug.lock#2);
[60081.326861] lock(cpuidle_lock);
[60081.327048] lock(cpu_hotplug.lock#2);
[60081.327284] lock(cpuidle_lock);
[60081.327398]
[60081.327398] *** DEADLOCK ***
[60081.327398]
[60081.327577] 8 locks held by hib.sh/2232:
[60081.327697] #0: (sb_writers#6){.+.+.+}, at: [<ffffffff8118342b>] vfs_write+0x18b/0x1d0
[60081.327974] #1: (&of->mutex){+.+.+.}, at: [<ffffffff811fafb7>] kernfs_fop_write+0xd7/0x190
[60081.328255] #2: (s_active#141){.+.+.+}, at: [<ffffffff811fafc0>] kernfs_fop_write+0xe0/0x190
[60081.328575] #3: (pm_mutex){+.+.+.}, at: [<ffffffff810a9c4a>] hibernate+0x3a/0x1d0
[60081.328835] #4: (device_hotplug_lock){+.+.+.}, at: [<ffffffff813eeae7>] lock_device_hotplug+0x17/0x20
[60081.329145] #5: (cpu_add_remove_lock){+.+.+.}, at: [<ffffffff8163ccdf>] enable_nonboot_cpus+0x2f/0x4b0
[60081.329456] #6: (cpu_hotplug.lock){++++++}, at: [<ffffffff81051675>] cpu_hotplug_begin+0x5/0x90
[60081.329779] #7: (cpu_hotplug.lock#2){+.+.+.}, at: [<ffffffff810516c8>] cpu_hotplug_begin+0x58/0x90
[60081.330085]
[60081.330085] stack backtrace:
[60081.330220] CPU: 0 PID: 2232 Comm: hib.sh Not tainted 3.18.0-rc1+ #1
[60081.330411] 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
[60081.330706] ffffffff8242aa50 ffff880381fcf9f8 ffffffff81640239 0000000000000000
[60081.330980] ffffffff8247aee0 ffff880381fcfa48 ffffffff8163f3e8 0000000000000008
[60081.331224] ffff880381fcfaa8 ffff880381fcfa48 ffff88038d7e9c28 ffff88038d7e9530
[60081.331468] Call Trace:
[60081.331548] [<ffffffff81640239>] dump_stack+0x4f/0x7c
[60081.331705] [<ffffffff8163f3e8>] print_circular_bug+0x2b8/0x2c9
[60081.331888] [<ffffffff8109e9a4>] __lock_acquire+0x2034/0x2410
[60081.332066] [<ffffffff811758c9>] ? kfree+0xc9/0x3a0
[60081.332247] [<ffffffff8109f68d>] lock_acquire+0xdd/0x2d0
[60081.332412] [<ffffffff814e3c67>] ? cpuidle_pause_and_lock+0x17/0x20
[60081.332606] [<ffffffff814e3c67>] ? cpuidle_pause_and_lock+0x17/0x20
[60081.332799] [<ffffffff81644d2e>] mutex_lock_nested+0x5e/0x410
[60081.332976] [<ffffffff814e3c67>] ? cpuidle_pause_and_lock+0x17/0x20
[60081.333169] [<ffffffff81354c1d>] ? acpi_evaluate_integer+0x34/0x52
[60081.333387] [<ffffffff814e3c67>] ? cpuidle_pause_and_lock+0x17/0x20
[60081.333580] [<ffffffff814e3c67>] cpuidle_pause_and_lock+0x17/0x20
[60081.333767] [<ffffffff8138032c>] acpi_processor_hotplug+0x4f/0x8d
[60081.333955] [<ffffffff8137e512>] acpi_cpu_soft_notify+0xb2/0xe8
[60081.334137] [<ffffffff81076255>] notifier_call_chain+0x55/0xb0
[60081.334316] [<ffffffff810762be>] __raw_notifier_call_chain+0xe/0x10
[60081.334537] [<ffffffff810515a3>] cpu_notify+0x23/0x40
[60081.334694] [<ffffffff810518a0>] _cpu_up+0x160/0x170
[60081.334849] [<ffffffff8163cda3>] enable_nonboot_cpus+0xf3/0x4b0
[60081.335031] [<ffffffff810a9165>] hibernation_snapshot+0x2e5/0x790
[60081.335218] [<ffffffff810a9d5a>] hibernate+0x14a/0x1d0
[60081.335378] [<ffffffff810a59c4>] state_store+0xe4/0xf0
[60081.335537] [<ffffffff812f0f2f>] kobj_attr_store+0xf/0x20
[60081.335704] [<ffffffff811fbce0>] sysfs_kf_write+0x50/0x70
[60081.335900] [<ffffffff811fafe5>] kernfs_fop_write+0x105/0x190
[60081.336077] [<ffffffff8118335d>] vfs_write+0xbd/0x1d0
[60081.336234] [<ffffffff81183dc2>] SyS_write+0x52/0xc0
[60081.336389] [<ffffffff816490d6>] system_call_fastpath+0x16/0x1b
[60081.336850] CPU1 is up
[60081.336970] smpboot: Booting Node 0 Processor 2 APIC 0x12
[60081.350648] CPU2 is up
[60081.350761] smpboot: Booting Node 0 Processor 3 APIC 0x13
[60081.364940] CPU3 is up
[60081.365047] smpboot: Booting Node 0 Processor 4 APIC 0x14
[60081.378750] CPU4 is up
[60081.378862] smpboot: Booting Node 0 Processor 5 APIC 0x15
[60081.393019] CPU5 is up
[60081.393125] smpboot: Booting Node 0 Processor 6 APIC 0x16
[60081.406864] CPU6 is up
[60081.406974] smpboot: Booting Node 0 Processor 7 APIC 0x17
[60081.421176] CPU7 is up
[60081.444773] PM: noirq restore of devices complete after 14.013 msecs
[60081.446047] PM: early restore of devices complete after 1.020 msecs
[60081.653282] rtc_cmos 00:03: System wakeup disabled by ACPI
[60081.653687] snd_hda_intel 0000:01:00.1: irq 49 for MSI/MSI-X
[60081.654224] serial 00:06: activated
[60081.655162] [drm] enabling PCIE gen 2 link speeds, disable with radeon.pcie_gen2=0
...
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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