Hello,
Has anyone else perhaps already run into this ?
Thanks,
Bart.
======================================================
[ INFO: possible circular locking dependency detected ]
3.15.0-rc4-debug+ #1 Not tainted
-------------------------------------------------------
multipathd/10364 is trying to acquire lock:
(&(&q->__queue_lock)->rlock){-.-...}, at: [<ffffffffa043bff3>] dm_table_run_md_queue_async+0x33/0x60 [dm_mod]
but task is already holding lock:
(&(&m->lock)->rlock){..-...}, at: [<ffffffffa077a647>] queue_if_no_path+0x27/0xc0 [dm_multipath]
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #1 (&(&m->lock)->rlock){..-...}:
[<ffffffff810a56c3>] lock_acquire+0x93/0x1c0
[<ffffffff814ae8eb>] _raw_spin_lock+0x3b/0x50
[<ffffffffa043a3e9>] dm_blk_open+0x19/0x80 [dm_mod]
[<ffffffff811cbc41>] __blkdev_get+0xd1/0x4c0
[<ffffffff811cc215>] blkdev_get+0x1e5/0x380
[<ffffffff811cc45b>] blkdev_open+0x5b/0x80
[<ffffffff8118a12e>] do_dentry_open.isra.15+0x1de/0x2a0
[<ffffffff8118a300>] finish_open+0x30/0x40
[<ffffffff8119c44d>] do_last.isra.61+0xa5d/0x1200
[<ffffffff8119cca7>] path_openat+0xb7/0x620
[<ffffffff8119d88a>] do_filp_open+0x3a/0x90
[<ffffffff8118bb4e>] do_sys_open+0x12e/0x210
[<ffffffff8118bc4e>] SyS_open+0x1e/0x20
[<ffffffff814b84e2>] tracesys+0xd0/0xd5
-> #0 (&(&q->__queue_lock)->rlock){-.-...}:
[<ffffffff810a4c46>] __lock_acquire+0x1716/0x1a00
[<ffffffff810a56c3>] lock_acquire+0x93/0x1c0
[<ffffffff814aea56>] _raw_spin_lock_irqsave+0x46/0x60
[<ffffffffa043bff3>] dm_table_run_md_queue_async+0x33/0x60 [dm_mod]
[<ffffffffa077a692>] queue_if_no_path+0x72/0xc0 [dm_multipath]
[<ffffffffa077a6f9>] multipath_presuspend+0x19/0x20 [dm_multipath]
[<ffffffffa043d34a>] dm_table_presuspend_targets+0x4a/0x60 [dm_mod]
[<ffffffffa043ad5d>] dm_suspend+0x6d/0x1f0 [dm_mod]
[<ffffffffa043ff63>] dev_suspend+0x1c3/0x220 [dm_mod]
[<ffffffffa0440759>] ctl_ioctl+0x269/0x500 [dm_mod]
[<ffffffffa0440a03>] dm_ctl_ioctl+0x13/0x20 [dm_mod]
[<ffffffff811a04c0>] do_vfs_ioctl+0x300/0x520
[<ffffffff811a0721>] SyS_ioctl+0x41/0x80
[<ffffffff814b84e2>] tracesys+0xd0/0xd5
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&m->lock)->rlock);
lock(&(&q->__queue_lock)->rlock);
lock(&(&m->lock)->rlock);
lock(&(&q->__queue_lock)->rlock);
*** DEADLOCK ***
2 locks held by multipathd/10364:
#0: (&md->suspend_lock){+.+...}, at: [<ffffffffa043ad28>] dm_suspend+0x38/0x1f0 [dm_mod]
#1: (&(&m->lock)->rlock){..-...}, at: [<ffffffffa077a647>] queue_if_no_path+0x27/0xc0 [dm_multipath]
stack backtrace:
CPU: 10 PID: 10364 Comm: multipathd Not tainted 3.15.0-rc4-debug+ #1
Hardware name: MSI MS-7737/Big Bang-XPower II (MS-7737), BIOS V1.5 10/16/2012
ffffffff81fea150 ffff8807c194fa98 ffffffff814a6780 ffffffff81fea150
ffff8807c194fad8 ffffffff814a36db ffff8807c194fb30 ffff8807c1954c88
0000000000000001 0000000000000002 ffff8807c1954c88 ffff8807c1954440
Call Trace:
[<ffffffff814a6780>] dump_stack+0x4e/0x7a
[<ffffffff814a36db>] print_circular_bug+0x200/0x20f
[<ffffffff810a4c46>] __lock_acquire+0x1716/0x1a00
[<ffffffff810a56c3>] lock_acquire+0x93/0x1c0
[<ffffffffa043bff3>] ? dm_table_run_md_queue_async+0x33/0x60 [dm_mod]
[<ffffffff814aea56>] _raw_spin_lock_irqsave+0x46/0x60
[<ffffffffa043bff3>] ? dm_table_run_md_queue_async+0x33/0x60 [dm_mod]
[<ffffffffa043bff3>] dm_table_run_md_queue_async+0x33/0x60 [dm_mod]
[<ffffffffa077a692>] queue_if_no_path+0x72/0xc0 [dm_multipath]
[<ffffffffa077a6f9>] multipath_presuspend+0x19/0x20 [dm_multipath]
[<ffffffffa043d34a>] dm_table_presuspend_targets+0x4a/0x60 [dm_mod]
[<ffffffffa043ad5d>] dm_suspend+0x6d/0x1f0 [dm_mod]
[<ffffffffa043ff63>] dev_suspend+0x1c3/0x220 [dm_mod]
[<ffffffffa043fda0>] ? table_load+0x350/0x350 [dm_mod]
[<ffffffffa0440759>] ctl_ioctl+0x269/0x500 [dm_mod]
[<ffffffffa0440a03>] dm_ctl_ioctl+0x13/0x20 [dm_mod]
[<ffffffff811a04c0>] do_vfs_ioctl+0x300/0x520
[<ffffffff811ac089>] ? __fget+0x129/0x300
[<ffffffff811abf65>] ? __fget+0x5/0x300
[<ffffffff811ac2d0>] ? __fget_light+0x30/0x160
[<ffffffff811a0721>] SyS_ioctl+0x41/0x80
[<ffffffff814b84e2>] tracesys+0xd0/0xd5
--
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