Hello,
locked spew with the current -next.
[ 427.152842] =============================================
[ 427.152843] [ INFO: possible recursive locking detected ]
[ 427.152847] 3.18.0-rc6-next-20141126-dbg-00001-gb80a67f-dirty #402 Not tainted
[ 427.152848] ---------------------------------------------
[ 427.152850] gcc/10495 is trying to acquire lock:
[ 427.152851] (&ei->i_data_sem){++++..}, at: [<ffffffff8119022f>] ext4_truncate+0x1cc/0x2bc
[ 427.152862]
but task is already holding lock:
[ 427.152864] (&ei->i_data_sem){++++..}, at: [<ffffffff8119022f>] ext4_truncate+0x1cc/0x2bc
[ 427.152868]
other info that might help us debug this:
[ 427.152870] Possible unsafe locking scenario:
[ 427.152872] CPU0
[ 427.152873] ----
[ 427.152874] lock(&ei->i_data_sem);
[ 427.152875] lock(&ei->i_data_sem);
[ 427.152877]
*** DEADLOCK ***
[ 427.152879] May be due to missing lock nesting notation
[ 427.152881] 5 locks held by gcc/10495:
[ 427.152883] #0: (sb_writers#7){.+.+.+}, at: [<ffffffff81101e62>] mnt_want_write+0x1f/0x46
[ 427.152891] #1: (sb_internal){.+.+..}, at: [<ffffffff8119119c>] ext4_evict_inode+0x1cb/0x3d6
[ 427.152897] #2: (jbd2_handle){+.+...}, at: [<ffffffff811c4099>] start_this_handle+0x4e0/0x566
[ 427.152902] #3: (&ei->i_data_sem){++++..}, at: [<ffffffff8119022f>] ext4_truncate+0x1cc/0x2bc
[ 427.152907] #4: (sb_internal){.+.+..}, at: [<ffffffff8119119c>] ext4_evict_inode+0x1cb/0x3d6
[ 427.152911]
stack backtrace:
[ 427.152915] CPU: 3 PID: 10495 Comm: gcc Not tainted 3.18.0-rc6-next-20141126-dbg-00001-gb80a67f-dirty #402
[ 427.152917] Hardware name: Acer Aspire 5741G /Aspire 5741G , BIOS V1.20 02/08/2011
[ 427.152919] ffffffff820f6e40 ffff880061a13908 ffffffff813cd7ff 0000000000000006
[ 427.152922] ffffffff820f6e40 ffff880061a139d8 ffffffff8106c27d ffff880152eb9c30
[ 427.152925] ffff880152eb9c30 ffff8800377a2000 ffff88014a6e47d8 0000000000000003
[ 427.152928] Call Trace:
[ 427.152934] [<ffffffff813cd7ff>] dump_stack+0x4c/0x65
[ 427.152938] [<ffffffff8106c27d>] __lock_acquire+0x7b5/0x1a17
[ 427.152941] [<ffffffff8118eff7>] ? ext4_mark_iloc_dirty+0x70c/0x7ab
[ 427.152944] [<ffffffff8106db62>] lock_acquire+0x4f/0x6e
[ 427.152946] [<ffffffff8119022f>] ? ext4_truncate+0x1cc/0x2bc
[ 427.152951] [<ffffffff81058acf>] ? __might_sleep+0xac/0xb4
[ 427.152955] [<ffffffff813d1695>] down_write+0x3d/0x6d
[ 427.152958] [<ffffffff8119022f>] ? ext4_truncate+0x1cc/0x2bc
[ 427.152961] [<ffffffff8119022f>] ext4_truncate+0x1cc/0x2bc
[ 427.152963] [<ffffffff811912a2>] ext4_evict_inode+0x2d1/0x3d6
[ 427.152967] [<ffffffff810fd871>] evict+0x102/0x1ad
[ 427.152969] [<ffffffff810fe490>] ? iput+0x120/0x131
[ 427.152971] [<ffffffff810fe498>] iput+0x128/0x131
[ 427.152974] [<ffffffff8118ef21>] ext4_mark_iloc_dirty+0x636/0x7ab
[ 427.152977] [<ffffffff8118f1a3>] ext4_mark_inode_dirty+0x8a/0x1a2
[ 427.152982] [<ffffffff811a484a>] __ext4_ext_dirty+0x6d/0x79
[ 427.152985] [<ffffffff811a731f>] ext4_ext_remove_space+0x858/0xcdc
[ 427.152988] [<ffffffff811a8cc7>] ext4_ext_truncate+0x9a/0xbe
[ 427.152991] [<ffffffff81190250>] ext4_truncate+0x1ed/0x2bc
[ 427.152994] [<ffffffff811912a2>] ext4_evict_inode+0x2d1/0x3d6
[ 427.152996] [<ffffffff810fd871>] evict+0x102/0x1ad
[ 427.152998] [<ffffffff8106b837>] ? trace_hardirqs_on_caller+0x180/0x19c
[ 427.153001] [<ffffffff810fe490>] ? iput+0x120/0x131
[ 427.153003] [<ffffffff810fe498>] iput+0x128/0x131
[ 427.153007] [<ffffffff810f4449>] do_unlinkat+0x141/0x213
[ 427.153013] [<ffffffff8100da89>] ? syscall_trace_enter_phase1+0x112/0x122
[ 427.153018] [<ffffffff812166db>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 427.153021] [<ffffffff810f4b84>] SyS_unlink+0x11/0x13
[ 427.153025] [<ffffffff813d34d6>] system_call_fastpath+0x16/0x1b
-ss
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