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    SubjectINFO: possible recursive locking detected: autofs4_expire_indirect()
    Date
    Hi,

    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.

    BR,
    Paweł.

    [ 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

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