linux-kernel - recursive locking (coredump/vfs

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Date:	Wed, 13 Nov 2013 16:11:47 -0500
From:	Dave Jones <davej@...hat.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: recursive locking (coredump/vfs_write)

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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