diff options
| author | Masanori ITOH <itoumsn@nttdata.co.jp> | 2010-10-26 17:21:20 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-10-26 19:52:04 -0400 |
| commit | 8474b591faf3bb0a1e08a60d21d6baac498f15e4 (patch) | |
| tree | 20ef171bed75108535151479a6f656a9fc4a51db /lib/percpu_counter.c | |
| parent | 52c5171214ff3327961d0ce0db7e8d2ce55004fd (diff) | |
percpu: fix list_head init bug in __percpu_counter_init()
WARNING: at lib/list_debug.c:26 __list_add+0x3f/0x81()
Hardware name: Express5800/B120a [N8400-085]
list_add corruption. next->prev should be prev (ffffffff81a7ea00), but was dead000000200200. (next=ffff88080b872d58).
Modules linked in: aoe ipt_MASQUERADE iptable_nat nf_nat autofs4 sunrpc bridge 8021q garp stp llc ipv6 cpufreq_ondemand acpi_cpufreq freq_table dm_round_robin dm_multipath kvm_intel kvm uinput lpfc scsi_transport_fc igb ioatdma scsi_tgt i2c_i801 i2c_core dca iTCO_wdt iTCO_vendor_support pcspkr shpchp megaraid_sas [last unloaded: aoe]
Pid: 54, comm: events/3 Tainted: G W 2.6.34-vanilla1 #1
Call Trace:
[<ffffffff8104bd77>] warn_slowpath_common+0x7c/0x94
[<ffffffff8104bde6>] warn_slowpath_fmt+0x41/0x43
[<ffffffff8120fd2e>] __list_add+0x3f/0x81
[<ffffffff81212a12>] __percpu_counter_init+0x59/0x6b
[<ffffffff810d8499>] bdi_init+0x118/0x17e
[<ffffffff811f2c50>] blk_alloc_queue_node+0x79/0x143
[<ffffffff811f2d2b>] blk_alloc_queue+0x11/0x13
[<ffffffffa02a931d>] aoeblk_gdalloc+0x8e/0x1c9 [aoe]
[<ffffffffa02aa655>] aoecmd_sleepwork+0x25/0xa8 [aoe]
[<ffffffff8106186c>] worker_thread+0x1a9/0x237
[<ffffffffa02aa630>] ? aoecmd_sleepwork+0x0/0xa8 [aoe]
[<ffffffff81065827>] ? autoremove_wake_function+0x0/0x39
[<ffffffff810616c3>] ? worker_thread+0x0/0x237
[<ffffffff810653ad>] kthread+0x7f/0x87
[<ffffffff8100aa24>] kernel_thread_helper+0x4/0x10
[<ffffffff8106532e>] ? kthread+0x0/0x87
[<ffffffff8100aa20>] ? kernel_thread_helper+0x0/0x10
It's because there is no initialization code for a list_head contained in
the struct backing_dev_info under CONFIG_HOTPLUG_CPU, and the bug comes up
when block device drivers calling blk_alloc_queue() are used. In case of
me, I got them by using aoe.
Signed-off-by: Masanori Itoh <itoumsn@nttdata.co.jp>
Cc: Tejun Heo <tj@kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/percpu_counter.c')
| -rw-r--r-- | lib/percpu_counter.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index ec9048e74f44..209448e1d2b9 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c | |||
| @@ -76,6 +76,7 @@ int __percpu_counter_init(struct percpu_counter *fbc, s64 amount, | |||
| 76 | if (!fbc->counters) | 76 | if (!fbc->counters) |
| 77 | return -ENOMEM; | 77 | return -ENOMEM; |
| 78 | #ifdef CONFIG_HOTPLUG_CPU | 78 | #ifdef CONFIG_HOTPLUG_CPU |
| 79 | INIT_LIST_HEAD(&fbc->list); | ||
| 79 | mutex_lock(&percpu_counters_lock); | 80 | mutex_lock(&percpu_counters_lock); |
| 80 | list_add(&fbc->list, &percpu_counters); | 81 | list_add(&fbc->list, &percpu_counters); |
| 81 | mutex_unlock(&percpu_counters_lock); | 82 | mutex_unlock(&percpu_counters_lock); |