Hi All,
I'm hitting an XFS lockdep error with Linus' tree today after the XFS
merge. I wasn't hitting this with v3.13-3995-g0dc3fd0, which seems
to backup the "before XFS merge" claim. Full text below:
[ 132.638044] ======================================================
[ 132.638045] [ INFO: possible circular locking dependency detected ]
[ 132.638047] 3.14.0-0.rc0.git7.1.fc21.x86_64 #1 Not tainted
[ 132.638048] -------------------------------------------------------
[ 132.638049] gnome-session/1432 is trying to acquire lock:
[ 132.638050] (&mm->mmap_sem){++++++}, at: [<ffffffff811b846f>] might_fault+0x
5f/0xb0
[ 132.638055]
but task is already holding lock:
[ 132.638056] (&(&ip->i_lock)->mr_lock){++++..}, at: [<ffffffffa05b3c12>] xfs_
ilock+0xf2/0x1c0 [xfs]
[ 132.638076]
which lock already depends on the new lock.
[ 132.638077]
the existing dependency chain (in reverse order) is:
[ 132.638078]
-> #1 (&(&ip->i_lock)->mr_lock){++++..}:
[ 132.638080] [<ffffffff810deaa2>] lock_acquire+0xa2/0x1d0
[ 132.638083] [<ffffffff8178312e>] _raw_spin_lock+0x3e/0x80
[ 132.638085] [<ffffffff8123c579>] __mark_inode_dirty+0x119/0x440
[ 132.638088] [<ffffffff812447fc>] __set_page_dirty+0x6c/0xc0
[ 132.638090] [<ffffffff812477e1>] mark_buffer_dirty+0x61/0x180
[ 132.638092] [<ffffffff81247a31>] __block_commit_write.isra.21+0x81/0xb0
[ 132.638094] [<ffffffff81247be6>] block_write_end+0x36/0x70
[ 132.638096] [<ffffffff81247c48>] generic_write_end+0x28/0x90
[ 132.638097] [<ffffffffa0554cab>] xfs_vm_write_end+0x2b/0x70 [xfs]
[ 132.638104] [<ffffffff8118c4f6>] generic_file_buffered_write+0x156/0x260
[ 132.638107] [<ffffffffa05651d7>] xfs_file_buffered_aio_write+0x107/0x250 [xfs]
[ 132.638115] [<ffffffffa05653eb>] xfs_file_aio_write+0xcb/0x130 [xfs]
[ 132.638122] [<ffffffff8120af8a>] do_sync_write+0x5a/0x90
[ 132.638125] [<ffffffff8120b74d>] vfs_write+0xbd/0x1f0
[ 132.638126] [<ffffffff8120c15c>] SyS_write+0x4c/0xa0
[ 132.638128] [<ffffffff8178db69>] system_call_fastpath+0x16/0x1b
[ 132.638130]
-> #0 (&mm->mmap_sem){++++++}:
[ 132.638132] [<ffffffff810de0fc>] __lock_acquire+0x18ec/0x1aa0
[ 132.638133] [<ffffffff810deaa2>] lock_acquire+0xa2/0x1d0
[ 132.638135] [<ffffffff811b849c>] might_fault+0x8c/0xb0
[ 132.638136] [<ffffffff81220a91>] filldir+0x91/0x120
[ 132.638138] [<ffffffffa0560f7f>] xfs_dir2_sf_getdents+0x23f/0x2a0 [xfs]
[ 132.638146] [<ffffffffa05613fb>] xfs_readdir+0x16b/0x1d0 [xfs]
[ 132.638154] [<ffffffffa056383b>] xfs_file_readdir+0x2b/0x40 [xfs]
[ 132.638161] [<ffffffff812208d8>] iterate_dir+0xa8/0xe0
[ 132.638163] [<ffffffff81220d83>] SyS_getdents+0x93/0x120
[ 132.638165] [<ffffffff8178db69>] system_call_fastpath+0x16/0x1b
[ 132.638166]
other info that might help us debug this:
[ 132.638167] Possible unsafe locking scenario:
[ 132.638168] CPU0 CPU1
[ 132.638169] ---- ----
[ 132.638169] lock(&(&ip->i_lock)->mr_lock);
[ 132.638171] lock(&mm->mmap_sem);
[ 132.638172] lock(&(&ip->i_lock)->mr_lock);
[ 132.638173] lock(&mm->mmap_sem);
[ 132.638174]
*** DEADLOCK ***
[ 132.638176] 2 locks held by gnome-session/1432:
[ 132.638177] #0: (&type->i_mutex_dir_key#4){+.+.+.}, at: [<ffffffff81220892>] iterate_dir+0x62/0xe0
[ 132.638180] #1: (&(&ip->i_lock)->mr_lock){++++..}, at: [<ffffffffa05b3c12>] xfs_ilock+0xf2/0x1c0 [xfs]
[ 132.638193]
stack backtrace:
[ 132.638195] CPU: 3 PID: 1432 Comm: gnome-session Not tainted 3.14.0-0.rc0.git7.1.fc21.x86_64 #1
[ 132.638196] Hardware name: Dell Inc. XPS 8300 /0Y2MRG, BIOS A06 10/17/2011
[ 132.638197] ffffffff825ba040 ffff88030dc75c60 ffffffff8177a8c9 ffffffff825ba040
[ 132.638199] ffff88030dc75ca0 ffffffff8177616c ffff88030dc75cf0 ffff8802fb51dba8
[ 132.638201] ffff8802fb51d010 0000000000000002 0000000000000002 ffff8802fb51dba8
[ 132.638203] Call Trace:
[ 132.638205] [<ffffffff8177a8c9>] dump_stack+0x4d/0x66
[ 132.638207] [<ffffffff8177616c>] print_circular_bug+0x201/0x20f
[ 132.638210] [<ffffffff810de0fc>] __lock_acquire+0x18ec/0x1aa0
[ 132.638212] [<ffffffff810deaa2>] lock_acquire+0xa2/0x1d0
[ 132.638213] [<ffffffff811b846f>] ? might_fault+0x5f/0xb0
[ 132.638215] [<ffffffff811b849c>] might_fault+0x8c/0xb0
[ 132.638216] [<ffffffff811b846f>] ? might_fault+0x5f/0xb0
[ 132.638218] [<ffffffff81220a91>] filldir+0x91/0x120
[ 132.638226] [<ffffffffa0560f7f>] xfs_dir2_sf_getdents+0x23f/0x2a0 [xfs]
[ 132.638237] [<ffffffffa05b3c12>] ? xfs_ilock+0xf2/0x1c0 [xfs]
[ 132.638245] [<ffffffffa05613fb>] xfs_readdir+0x16b/0x1d0 [xfs]
[ 132.638253] [<ffffffffa056383b>] xfs_file_readdir+0x2b/0x40 [xfs]
[ 132.638255] [<ffffffff812208d8>] iterate_dir+0xa8/0xe0
[ 132.638258] [<ffffffff8122ca7c>] ? fget_light+0x3c/0x4f0
[ 132.638260] [<ffffffff81220d83>] SyS_getdents+0x93/0x120
[ 132.638261] [<ffffffff81220a00>] ? fillonedir+0xf0/0xf0
[ 132.638264] [<ffffffff81134ecc>] ? __audit_syscall_entry+0x9c/0xf0
[ 132.638265] [<ffffffff8178db69>] system_call_fastpath+0x16/0x1b
josh
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