Hello Xfs,
Not sure if i have to report it this way... but anyway, at least it
will be informative.
I have problems with XFS file system with quota support. It
sometimes freeze on write operations to filesystem. It's rare,
freeze ocurring after a week or two of normal opetaion. I experience
it since 2.6.23 series kernel and unable to track it down to get
more detailed info...
It's possible that it related to locking, as filesystem is still
accesible for read operations. But I unable to recover additional
info and just recently recompiled kernel with debug info to track it
down.
so far the only info I get is this INFO warning on boot:
=============================================
[ INFO: possible recursive locking detected ]
2.6.25.4-g6dbg #1
---------------------------------------------
mysqld/1883 is trying to acquire lock:
(&list->qh_lock){--..}, at: [<c0255308>] xfs_qm_dqget+0x288/0x370
but task is already holding lock:
(&list->qh_lock){--..}, at: [<c025513d>] xfs_qm_dqget+0xbd/0x370
other info that might help us debug this:
3 locks held by mysqld/1883:
#0: (&type->i_mutex_dir_key#2){--..}, at: [<c017f3f1>] open_namei+0xf1/0x5f0
#1: (&(&ip->i_lock)->mr_lock){----}, at: [<c028d84f>] xfs_ilock+0x8f/0xd0
#2: (&list->qh_lock){--..}, at: [<c025513d>] xfs_qm_dqget+0xbd/0x370
stack backtrace:
Pid: 1883, comm: mysqld Not tainted 2.6.25.4-g6dbg #1
[<c014310d>] __lock_acquire+0xe5d/0x1080
[<c0142626>] __lock_acquire+0x376/0x1080
[<c01433b7>] lock_acquire+0x87/0xb0
[<c0255308>] xfs_qm_dqget+0x288/0x370
[<c0591f6e>] mutex_lock_nested+0x9e/0x280
[<c0255308>] xfs_qm_dqget+0x288/0x370
[<c0255308>] xfs_qm_dqget+0x288/0x370
[<c0255308>] xfs_qm_dqget+0x288/0x370
[<c02594f2>] xfs_qm_dqattach_one+0xd2/0x1a0
[<c0259762>] xfs_qm_dqattach+0x1a2/0x1d0
[<c0259a88>] xfs_qm_vop_dqalloc+0x248/0x300
[<c02af109>] xfs_create+0xa9/0x490
[<c010849b>] native_sched_clock+0x7b/0xd0
[<c02ba9b9>] xfs_vn_mknod+0x159/0x1a0
[<c017d059>] vfs_create+0xc9/0x120
[<c017f850>] open_namei+0x550/0x5f0
[<c017268e>] do_filp_open+0x2e/0x60
[<c0593414>] _spin_unlock+0x14/0x20
[<c0172405>] get_unused_fd_flags+0xc5/0xe0
[<c017270c>] do_sys_open+0x4c/0xe0
[<c017281c>] sys_open+0x2c/0x40
[<c0102f2e>] syscall_call+0x7/0xb
=======================
If there is any additional info that might help you, I'm gladly provide
it to you.
--
Best regards,
Roman Kravchenko
A Technologies
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