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Subjectvfs: chmod: Hung task after calling chmod()
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Hi all,

I've found the following backtrace after running the trinity fuzzer in a KVM guest using the latest linux-next. Unfortunately I don't have full logs for this, so I can't tell exactly which parameters were passed to chmod().

[ 241.469508] INFO: task trinity:3058 blocked for more than 120 seconds.
[ 241.471949] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 241.476626] trinity D 0000000000000000 4544 3058 1 0x00000000
[ 241.480595] ffff880035f29d98 0000000000000082 ffff880035f29d28 ffff880035f29fd8
[ 241.483212] 00000000001d4340 ffff880035f28000 00000000001d4340 00000000001d4340
[ 241.487158] 00000000001d4340 00000000001d4340 ffff880035f29fd8 00000000001d4340
[ 241.490875] Call Trace:
[ 241.492186] [<ffffffff826edfc4>] schedule+0x24/0x70
[ 241.493132] [<ffffffff826ee023>] schedule_preempt_disabled+0x13/0x20
[ 241.493878] [<ffffffff826ec79f>] __mutex_lock_common+0x1ff/0x5a0
[ 241.494683] [<ffffffff811dbe4a>] ? chmod_common+0x5a/0xc0
[ 241.495357] [<ffffffff811ea22e>] ? putname+0x2e/0x40
[ 241.495946] [<ffffffff811dbe4a>] ? chmod_common+0x5a/0xc0
[ 241.496669] [<ffffffff826ecb80>] mutex_lock_nested+0x40/0x50
[ 241.497388] [<ffffffff811dbe4a>] chmod_common+0x5a/0xc0
[ 241.498033] [<ffffffff811e079c>] ? __fput+0x1cc/0x300
[ 241.498656] [<ffffffff826f0da9>] ? sysret_check+0x22/0x5d
[ 241.499480] [<ffffffff811dc964>] sys_fchmodat+0x34/0x50
[ 241.500350] [<ffffffff811dc994>] sys_chmod+0x14/0x20
[ 241.500952] [<ffffffff826f0d7d>] system_call_fastpath+0x1a/0x1f
[ 241.501671] 1 lock held by trinity/3058:
[ 241.502142] #0: (&type->i_mutex_dir_key){+.+.+.}, at: [<ffffffff811dbe4a>] chmod_common+0x5a/0xc0
[ 241.503314] Kernel panic - not syncing: hung_task: blocked tasks

--

Sasha.



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