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Date: Thu, 13 Mar 2014 09:27:44 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Jason Low <jason.low2@...com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: [locking/mutexes] WARNING: CPU: 1 PID: 77 at
kernel/locking/mutex-debug.c:82 debug_mutex_unlock()
Hi Jason,
I got the below dmesg and the first bad commit is
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/locking
commit 1d8fe7dc8078b23e060ec62ccb4cdc1ac3c41bf8
Author: Jason Low <jason.low2@...com>
AuthorDate: Tue Jan 28 11:13:14 2014 -0800
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Tue Mar 11 12:14:54 2014 +0100
locking/mutexes: Unlock the mutex without the wait_lock
+----------------------------------------------------------------------+------------+------------+
| | 1d8fe7dc80 | 221f19a662 |
+----------------------------------------------------------------------+------------+------------+
| boot_successes | 2 | 1 |
| boot_failures | 18 | 18 |
| WARNING:CPU:PID:at_kernel/locking/mutex-debug.c:debug_mutex_unlock() | 18 | 18 |
| backtrace:do_fork | 3 | 2 |
| backtrace:SyS_clone | 3 | 2 |
| backtrace:kobject_add_internal | 1 | |
| backtrace:kobject_init_and_add | 1 | |
| backtrace:acpi_bus_register_driver | 1 | |
| backtrace:acpi_battery_init_async | 1 | |
| backtrace:async_run_entry_fn | 1 | |
| backtrace:do_execve | 2 | 1 |
| backtrace:SyS_execve | 2 | 1 |
| backtrace:user_path_at | 1 | |
| backtrace:SyS_faccessat | 1 | |
| backtrace:SyS_access | 1 | |
| backtrace:user_statfs | 1 | 1 |
| backtrace:SyS_statfs | 1 | 1 |
| backtrace:serio_handle_event | 2 | 2 |
| backtrace:vm_mmap_pgoff | 2 | 1 |
| backtrace:SyS_mmap_pgoff | 2 | 1 |
| backtrace:SyS_mmap | 2 | 1 |
| backtrace:do_group_exit | 1 | 4 |
| backtrace:SyS_exit_group | 1 | 4 |
| backtrace:vfs_stat | 1 | |
| backtrace:SyS_newstat | 1 | |
| backtrace:mprotect_fixup | 3 | 4 |
| backtrace:SyS_mprotect | 3 | 4 |
| backtrace:misc_register | 1 | |
| backtrace:wafwdt_init | 1 | |
| backtrace:kernel_init_freeable | 1 | |
+----------------------------------------------------------------------+------------+------------+
[ 5.550712] debug: unmapping init [mem 0xffffffff81c28000-0xffffffff81d5cfff]
[ 5.573371] random: init urandom read with 6 bits of entropy available
[ 5.636471] ------------[ cut here ]------------
[ 5.637033] WARNING: CPU: 1 PID: 77 at kernel/locking/mutex-debug.c:82 debug_mutex_unlock+0x211/0x220()
[ 5.637033] DEBUG_LOCKS_WARN_ON(lock->owner != current)
[ 5.637033] Modules linked in:
[ 5.637033] CPU: 1 PID: 77 Comm: sh Not tainted 3.14.0-rc6-01849-g221f19a #2
[ 5.637033] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 5.637033] 0000000000000009 ffff8800070bfc98 ffffffff816e5665 ffff8800070bfce0
[ 5.637033] ffff8800070bfcd0 ffffffff8106ad6d ffff88000c86d3a0 0000000000000001
[ 5.637033] 0000000000000246 00000000000000b0 ffff88000c86d300 ffff8800070bfd30
[ 5.637033] Call Trace:
[ 5.637033] [<ffffffff816e5665>] dump_stack+0x4d/0x66
[ 5.637033] [<ffffffff8106ad6d>] warn_slowpath_common+0x7d/0xa0
[ 5.637033] [<ffffffff8106addc>] warn_slowpath_fmt+0x4c/0x50
[ 5.637033] [<ffffffff810be531>] debug_mutex_unlock+0x211/0x220
[ 5.637033] [<ffffffff816f12db>] __mutex_unlock_slowpath+0xdb/0x210
[ 5.637033] [<ffffffff816f141e>] mutex_unlock+0xe/0x10
[ 5.637033] [<ffffffff8116f8ef>] vma_link+0x7f/0xd0
[ 5.637033] [<ffffffff81171a74>] mmap_region+0x494/0x670
[ 5.637033] [<ffffffff810c405e>] ? __lock_acquire+0x48e/0xcc0
[ 5.637033] [<ffffffff81171f62>] do_mmap_pgoff+0x312/0x3e0
[ 5.637033] [<ffffffff81160230>] vm_mmap_pgoff+0x90/0xc0
[ 5.637033] [<ffffffff811705b7>] SyS_mmap_pgoff+0xe7/0x110
[ 5.637033] [<ffffffff810082e2>] SyS_mmap+0x22/0x30
[ 5.637033] [<ffffffff816f4639>] system_call_fastpath+0x16/0x1b
[ 5.637033] ---[ end trace 926fb1180f642ed0 ]---
[ 5.798610] init: Failed to create pty - disabling logging for job
git bisect start 221f19a662f536aa8640694e744019776d2df584 8712a00514e50aafa7c9bf5cd3955fa60758e53b --
git bisect bad 8d8ec3963d9d341ca73b817a931f274807ecc5ae # 15:55 0- 2 Merge branch 'x86/asmlinkage'
git bisect bad b4a4183f983cfed78029b7ce9a7b809da742b794 # 16:32 0- 5 Merge branch 'perf/urgent'
git bisect bad 319309fdafea7717522b94e406ea3429fd9498b4 # 16:44 0- 2 Merge branch 'core/types'
git bisect bad cbdc4aaf1932bbf23934443126f610b64d53e7ce # 17:39 0- 1 manual merge of core/locking
git bisect good 47be1c1a0e188232b5e5962917b21750053cd3f8 # 18:09 20+ 0 lockdep: Change lockdep_set_novalidate_class() to use _and_name
git bisect good c9122da1e2d29bd6a1475a0d1ce2aa6ac6ea25fa # 18:46 20+ 0 locking: Move mcs_spinlock.h into kernel/locking/
git bisect bad 1d8fe7dc8078b23e060ec62ccb4cdc1ac3c41bf8 # 19:22 0- 9 locking/mutexes: Unlock the mutex without the wait_lock
git bisect good 47667fa1502e4d759df87e9cc7fbc0f202483361 # 20:14 20+ 0 locking/mutexes: Modify the way optimistic spinners are queued
# first bad commit: [1d8fe7dc8078b23e060ec62ccb4cdc1ac3c41bf8] locking/mutexes: Unlock the mutex without the wait_lock
git bisect good 47667fa1502e4d759df87e9cc7fbc0f202483361 # 20:28 60+ 0 locking/mutexes: Modify the way optimistic spinners are queued
git bisect bad 221f19a662f536aa8640694e744019776d2df584 # 20:28 0- 18 Merge branch 'tools/kvm'
git bisect good 33807f4f0daec3b00565c2932d95f614f5833adf # 21:43 60+ 0 Merge branch 'for-next' of git://git.samba.org/sfrench/cifs-2.6
git bisect good 69d5cdda16b3c9767b82d80b07edb9bb056448e3 # 22:40 60+ 1 Add linux-next specific files for 20140311
git bisect bad 6670a8a6f7e711b45114e6c66871d8bbc22a59ed # 22:41 0- 9 Merge branch 'timers/core'
Thanks,
Fengguang
View attachment "dmesg-quantal-jaketown-35:20140312142835:x86_64-randconfig-c6-0312::" of type "text/plain" (57741 bytes)
Download attachment "x86_64-randconfig-c6-0312-221f19a662f536aa8640694e744019776d2df584-WARNING:---at----debug_mutex_unlock+-x-21447.log" of type "application/octet-stream" (39109 bytes)
View attachment "config-3.14.0-rc6-01849-g221f19a" of type "text/plain" (81101 bytes)
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