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Date: Fri, 7 Feb 2014 10:23:32 +0800
From: Fengguang Wu <fengguang.wu@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>,
linux-kernel@...r.kernel.org
Subject: [sched/fair] BUG: unable to handle kernel NULL pointer dereference
at 0000000000000078
Greetings,
I got the below dmesg and the first bad commit is
git://git.linaro.org/people/dlezcano/linux sched/idle-balance
commit e7b0e894d633a59a5de296b1ec45806993239799
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Sat Feb 11 06:05:00 2012 +0100
Commit: Daniel Lezcano <daniel.lezcano@...aro.org>
CommitDate: Wed Feb 5 11:55:42 2014 +0100
sched/fair: track cgroup depth
Track depth in cgroup tree, this is useful for things like
find_matching_se() where you need to get to a common parent of two
sched entities.
Keeping the depth avoids having to calculate it on the spot, which
saves a number of possible cache-misses.
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1328936700.2476.17.camel@laptop
Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
+---------------------------------------------------------+----+
| | |
+---------------------------------------------------------+----+
| boot_successes | 0 |
| boot_failures | 19 |
| BUG:unable_to_handle_kernel_NULL_pointer_dereference_at | 19 |
| Oops:SMP | 19 |
| RIP:pick_next_task_fair | 7 |
| Kernel_panic-not_syncing:Fatal_exception | 19 |
| backtrace:do_group_exit | 19 |
| backtrace:SyS_exit_group | 19 |
| RIP:check_preempt_wakeup | 12 |
+---------------------------------------------------------+----+
[ 11.140305] Freeing unused kernel memory: 648K (ffff88000155e000 - ffff880001600000)
[ 11.156403] Freeing unused kernel memory: 1852K (ffff880001831000 - ffff880001a00000)
[ 11.177538] random: init urandom read with 5 bits of entropy available
[ 11.193582] BUG: unable to handle kernel NULL pointer dereference at 0000000000000078
[ 11.194018] IP: [<ffffffff8108eff6>] pick_next_task_fair+0x171/0x238
[ 11.194018] PGD 0
[ 11.194018] Oops: 0000 [#1] SMP
[ 11.194018] Modules linked in:
[ 11.194018] CPU: 0 PID: 83 Comm: hostname Not tainted 3.14.0-rc1-00092-g92ed244 #33
[ 11.194018] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 11.194018] task: ffff880007bea840 ti: ffff88000ef9e000 task.ti: ffff88000ef9e000
[ 11.194018] RIP: 0010:[<ffffffff8108eff6>] [<ffffffff8108eff6>] pick_next_task_fair+0x171/0x238
[ 11.194018] RSP: 0018:ffff88000ef9fd70 EFLAGS: 00010046
[ 11.194018] RAX: 00000002893d47ce RBX: ffff88000ee6f248 RCX: 0000000000000000
[ 11.194018] RDX: 0000000000000000 RSI: ffff88000ef053d8 RDI: ffff88000d928078
[ 11.194018] RBP: ffff88000ef9fda0 R08: 000000000000297c R09: 000000000000b6c8
[ 11.194018] R10: ffff88000e60a000 R11: 00000000000023d5 R12: ffff88000d928000
[ 11.194018] R13: ffff88000e6127b8 R14: 0000000000000000 R15: 0000000000000001
[ 11.194018] FS: 0000000000000000(0000) GS:ffff88000e600000(0000) knlGS:0000000000000000
[ 11.194018] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 11.194018] CR2: 0000000000000078 CR3: 0000000001a06000 CR4: 00000000000006f0
[ 11.194018] Stack:
[ 11.194018] ffff88000e612740 ffff88000e612740 0000000000000000 ffff880007beac38
[ 11.194018] ffff88000d928000 ffff880007bea840 ffff88000ef9fea0 ffffffff8154fa9a
[ 11.194018] ffff88000ef9ffd8 ffff880007bea840 0000000000012740 0000000000000011
[ 11.194018] Call Trace:
[ 11.194018] [<ffffffff8154fa9a>] __schedule+0x1be/0x756
[ 11.194018] [<ffffffff81553205>] ? _raw_spin_unlock_irqrestore+0x51/0x7b
[ 11.194018] [<ffffffff8106a2ff>] ? do_notify_parent+0x22b/0x240
[ 11.194018] [<ffffffff810f0e81>] ? task_function_call+0x44/0x4e
[ 11.194018] [<ffffffff810f59b0>] ? __perf_event_task_sched_out+0x329/0x329
[ 11.194018] [<ffffffff81553023>] ? _raw_spin_lock_irqsave+0x25/0x69
[ 11.194018] [<ffffffff815500a1>] schedule+0x6f/0x71
[ 11.194018] [<ffffffff8105ccd7>] do_exit+0x8e8/0x927
[ 11.194018] [<ffffffff810890cb>] ? vtime_account_user+0x52/0x57
[ 11.194018] [<ffffffff8105dc05>] do_group_exit+0x4a/0x110
[ 11.194018] [<ffffffff8105dcdf>] SyS_exit_group+0x14/0x14
[ 11.194018] [<ffffffff8155ad9b>] tracesys+0xdd/0xe2
[ 11.194018] Code: e8 f2 d2 ff ff 4c 8b a3 80 00 00 00 4d 85 e4 0f 85 e8 fe ff ff 4c 8d 63 98 4d 39 e6 74 61 4d 85 f6 74 5c 49 83 c6 68 4c 8b 6b 78 <49> 8b 7e 78 49 39 fd 74 30 44 8b 7b 68 45 8b 6e 68 45 39 ef 7f
[ 11.194018] RIP [<ffffffff8108eff6>] pick_next_task_fair+0x171/0x238
[ 11.194018] RSP <ffff88000ef9fd70>
[ 11.194018] CR2: 0000000000000078
[ 11.194018] ---[ end trace d8c5bf7ff957e138 ]---
[ 11.194018] Kernel panic - not syncing: Fatal exception
git bisect start 92ed2443d0f6e23e9594bb601be3168e272749a0 38dbfb59d1175ef458d006556061adeaa8751b72 --
git bisect good 7b13b156348b40fec269e870b16aa08dbb498e8d # 18:27 20+ 0 Merge 'spi/for-next' into devel-cairo-x86_64-201402052359
git bisect bad 9fa2e2a660ea38b0d0dc750e804377a81faab387 # 19:20 0- 2 Merge 'dlezcano/sched/idle-balance' into devel-cairo-x86_64-201402052359
git bisect bad 7ae0268f44c13f451ffdb8577e60e54319d06f0b # 20:10 0- 10 sched/fair: clean up __clear_buddies_*
git bisect good 58b46da336a9312b2e21bb576d1c2c484dbf6257 # 20:52 20+ 0 sched/numa: Rename variables in task_numa_fault()
git bisect good a68f0647428f0adba291ec07bbfad1b6ae68f56b # 21:36 20+ 0 sched: Fix race in idle_balance()
git bisect good a73b2fc4f74ca24e7d9261d6728a554227b7c913 # 22:05 20+ 0 sched: Clean up idle task SMP logic
git bisect bad 2c9b2540b77a3f7d25ef63f2449a9edf9054dd4e # 22:47 0- 1 sched: Push put_prev_task() into pick_next_task()
git bisect bad e7b0e894d633a59a5de296b1ec45806993239799 # 23:09 0- 8 sched/fair: track cgroup depth
# first bad commit: [e7b0e894d633a59a5de296b1ec45806993239799] sched/fair: track cgroup depth
git bisect good a73b2fc4f74ca24e7d9261d6728a554227b7c913 # 23:27 60+ 0 sched: Clean up idle task SMP logic
git bisect bad 92ed2443d0f6e23e9594bb601be3168e272749a0 # 23:27 0- 19 0day head guard for 'devel-cairo-x86_64-201402052359'
git bisect good ef42c58a5b4b8060a3931aab36bf2b4f81b44afc # 00:59 60+ 0 Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 0cc2aa51be9d2f2b001c0e070b2e5cdde89b39f4 # 01:55 60+ 0 Add linux-next specific files for 20140206
Thanks,
Fengguang
View attachment "dmesg-quantal-snb-27:20140206001642:x86_64-randconfig-c0-0205:3.14.0-rc1-00092-g92ed244:33" of type "text/plain" (240839 bytes)
View attachment "config-3.14.0-rc1-00092-g92ed244" of type "text/plain" (79678 bytes)
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