Hey Al,
here's another one..
=============================================
[ INFO: possible recursive locking detected ]
3.12.0+ #2 Not tainted
---------------------------------------------
trinity-child3/13302 is trying to acquire lock:
(sb_writers#5){.+.+.+}, at: [<ffffffff811b7013>] vfs_write+0x173/0x1f0
but task is already holding lock:
(sb_writers#5){.+.+.+}, at: [<ffffffff8122006d>] do_coredump+0xf1d/0x1070
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(sb_writers#5);
lock(sb_writers#5);
*** DEADLOCK ***
May be due to missing lock nesting notation
1 lock held by trinity-child3/13302:
#0: (sb_writers#5){.+.+.+}, at: [<ffffffff8122006d>] do_coredump+0xf1d/0x1070
stack backtrace:
CPU: 3 PID: 13302 Comm: trinity-child3 Not tainted 3.12.0+ #2
ffffffff82526e10 ffff8801b54af820 ffffffff8171b3dc ffffffff82526e10
ffff8801b54af8e0 ffffffff810d722b 00007f93d6ce5000 0000000000000000
ffff880154b3f200 ffff880100000000 00000000004da26d ffffffff821b3901
Call Trace:
[<ffffffff8171b3dc>] dump_stack+0x4e/0x7a
[<ffffffff810d722b>] __lock_acquire+0x19ab/0x19f0
[<ffffffff81729334>] ? __do_page_fault+0x264/0x610
[<ffffffff8100b144>] ? native_sched_clock+0x24/0x80
[<ffffffff810d1d1f>] ? trace_hardirqs_off_caller+0x1f/0xc0
[<ffffffff810d7a23>] lock_acquire+0x93/0x1c0
[<ffffffff811b7013>] ? vfs_write+0x173/0x1f0
[<ffffffff811b97f9>] __sb_start_write+0xc9/0x1a0
[<ffffffff811b7013>] ? vfs_write+0x173/0x1f0
[<ffffffff811b7013>] ? vfs_write+0x173/0x1f0
[<ffffffff812cc303>] ? security_file_permission+0x23/0xa0
[<ffffffff811b7013>] vfs_write+0x173/0x1f0
[<ffffffff8121ef02>] dump_emit+0x92/0xd0
[<ffffffff81218d50>] elf_core_dump+0xde0/0x1740
[<ffffffff81218832>] ? elf_core_dump+0x8c2/0x1740
[<ffffffff8121fdee>] do_coredump+0xc9e/0x1070
[<ffffffff81719d9b>] ? __slab_free+0x191/0x35d
[<ffffffff8106a9b8>] get_signal_to_deliver+0x2c8/0x930
[<ffffffff810024b8>] do_signal+0x48/0x610
[<ffffffff810d1e39>] ? get_lock_stats+0x19/0x60
[<ffffffff810d25ae>] ? put_lock_stats.isra.28+0xe/0x30
[<ffffffff81715e86>] ? pagefault_enable+0xe/0x21
[<ffffffff8114b86e>] ? context_tracking_user_exit+0x4e/0x190
[<ffffffff810d54c5>] ? trace_hardirqs_on_caller+0x115/0x1e0
[<ffffffff81002adc>] do_notify_resume+0x5c/0xa0
[<ffffffff81725f86>] retint_signal+0x46/0x90
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