Messages in this thread | | | Date | Thu, 27 Oct 2011 09:31:18 -0400 | From | Nick Bowler <> | Subject | Re: INFO: possible recursive locking detected: autofs4_expire_indirect() |
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On 2011-10-25 14:48 +0200, Pawel Sikora wrote: > the nfs client/server with fresh 3.0.8 + vserver + enabled debug options reports attached info. > afaics, the vserver doesn't change autofs code, so it looks like a pure vanilla problem.
I reported this issue a long time ago, and a patch[1] was provided quickly, but it seems that for some reason it never made it to mainline.
Adding Steven to CC.
[1] http://permalink.gmane.org/gmane.linux.kernel/1129741
> [ 3708.715749] ============================================= > [ 3708.715940] [ INFO: possible recursive locking detected ] > [ 3708.716040] 3.0.8-vs2.3.1-dirty #6 > [ 3708.716131] --------------------------------------------- > [ 3708.716230] automount/29215 is trying to acquire lock: > [ 3708.716301] (&(&dentry->d_lock)->rlock/1){+.+...}, at: [<ffffffffa0214fb0>] autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] > [ 3708.716301] but task is already holding lock: > [ 3708.716301] (&(&dentry->d_lock)->rlock/1){+.+...}, at: [<ffffffffa0214fb0>] autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] > [ 3708.716301] other info that might help us debug this: > [ 3708.716301] Possible unsafe locking scenario: > [ 3708.716301] > [ 3708.716301] CPU0 > [ 3708.716301] ---- > [ 3708.716301] lock(&(&dentry->d_lock)->rlock); > [ 3708.716301] lock(&(&dentry->d_lock)->rlock); > [ 3708.716301] > [ 3708.716301] *** DEADLOCK *** > [ 3708.716301] > [ 3708.716301] May be due to missing lock nesting notation > [ 3708.716301] > [ 3708.716301] 2 locks held by automount/29215: > [ 3708.716301] #0: (&(&sbi->lookup_lock)->rlock){+.+...}, at: [<ffffffffa0214f61>] autofs4_expire_indirect+0x91/0x4e0 [autofs4] > [ 3708.716301] #1: (&(&dentry->d_lock)->rlock/1){+.+...}, at: [<ffffffffa0214fb0>] autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] > [ 3708.716301] stack backtrace: > [ 3708.716301] Pid: 29215, comm: automount Not tainted 3.0.8-vs2.3.1-dirty #6 > [ 3708.716301] Call Trace: > [ 3708.716301] [<ffffffff810925d6>] __lock_acquire+0x1606/0x1b50 > [ 3708.716301] [<ffffffffa0214fb0>] ? autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffff81092c6a>] ? lock_release_non_nested+0x14a/0x310 > [ 3708.716301] [<ffffffffa0214fb0>] ? autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffffa0214fb0>] ? autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffff810930c5>] lock_acquire+0x85/0x110 > [ 3708.716301] [<ffffffffa0214fb0>] ? autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffffa02151bd>] ? autofs4_expire_indirect+0x2ed/0x4e0 [autofs4] > [ 3708.716301] [<ffffffff81453c1a>] _raw_spin_lock_nested+0x2a/0x40 > [ 3708.716301] [<ffffffffa0214fb0>] ? autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffff81454386>] ? _raw_spin_unlock+0x26/0x30 > [ 3708.716301] [<ffffffff8110f830>] ? might_fault+0x40/0x90 > [ 3708.716301] [<ffffffffa0214fb0>] autofs4_expire_indirect+0xe0/0x4e0 [autofs4] > [ 3708.716301] [<ffffffffa021568d>] autofs4_do_expire_multi+0xed/0x130 [autofs4] > [ 3708.716301] [<ffffffffa0215a70>] ? autofs_dev_ioctl_askumount+0x30/0x30 [autofs4] > [ 3708.716301] [<ffffffffa0215a8a>] autofs_dev_ioctl_expire+0x1a/0x20 [autofs4] > [ 3708.716301] [<ffffffffa0216063>] _autofs_dev_ioctl+0x273/0x360 [autofs4] > [ 3708.716301] [<ffffffffa021615e>] autofs_dev_ioctl+0xe/0x20 [autofs4] > [ 3708.716301] [<ffffffff8115dc56>] do_vfs_ioctl+0x96/0x560 > [ 3708.716301] [<ffffffff8114c289>] ? fget_light+0x99/0x130 > [ 3708.716301] [<ffffffff8114c227>] ? fget_light+0x37/0x130 > [ 3708.716301] [<ffffffff8115e1b1>] sys_ioctl+0x91/0xa0 > [ 3708.716301] [<ffffffff8145bdbb>] system_call_fastpath+0x16/0x1b
Cheers, -- Nick Bowler, Elliptic Technologies (http://www.elliptictech.com/)
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