linux-kernel - [lkp] [nbd] fd8383fd88: BUG: sleeping function called from invalid context at kernel/locking/mutex.c:620

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Date:   Mon, 19 Sep 2016 10:19:17 +0800
From:   kernel test robot <xiaolong.ye@...el.com>
To:     Josef Bacik <jbacik@...com>
Cc:     Jens Axboe <axboe@...com>, LKML <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>, lkp@...org
Subject: [lkp] [nbd]  fd8383fd88: BUG: sleeping function called from invalid
 context at kernel/locking/mutex.c:620


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-4.9/block
commit fd8383fd88a2fd842a9431df5ed353bd7129eecc ("nbd: convert to blkmq")

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M

caused below changes:


+-----------------------------------------------------------------------------+------------+------------+
|                                                                             | 99e6b87ec2 | fd8383fd88 |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes                                                              | 2          | 2          |
| boot_failures                                                               | 1          | 6          |
| BUG:kernel_reboot-without-warning_in_test_stage                             | 1          | 2          |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 0          | 4          |
| calltrace:compat_SyS_mount                                                  | 0          | 4          |
+-----------------------------------------------------------------------------+------------+------------+



[   17.658062] floppy: error -5 while reading block 0
[   17.684670] blk_update_request: I/O error, dev fd0, sector 0
[   17.686098] floppy: error -5 while reading block 0
[   17.698207] BUG: sleeping function called from invalid context at kernel/locking/mutex.c:620
[   17.700903] in_atomic(): 1, irqs_disabled(): 0, pid: 1050, name: mount
[   17.702350] 1 lock held by mount/1050:
[   17.703395]  #0:  (&type->s_umount_key#20/1){+.+.+.}, at: [<ffffffff8122627b>] sget_userns+0x2f7/0x4b0
[   17.706064] CPU: 0 PID: 1050 Comm: mount Not tainted 4.8.0-rc4-00007-gfd8383fd #1
[   17.708149] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   17.710523]  0000000000000000 ffff880034dd39f0 ffffffff8178e23d ffff8800350e4d00
[   17.712773]  000000000000041a ffff880034dd3a18 ffffffff81108c39 ffffffff839f1476
[   17.714978]  000000000000026c 0000000000000000 ffff880034dd3a40 ffffffff81108cb5
[   17.717224] Call Trace:
[   17.718130]  [<ffffffff8178e23d>] dump_stack+0x82/0xb8
[   17.719474]  [<ffffffff81108c39>] ___might_sleep+0x1bd/0x1c4
[   17.720813]  [<ffffffff81108cb5>] __might_sleep+0x75/0x7c
[   17.722100]  [<ffffffff82ef53e2>] mutex_lock_nested+0x3e/0x396
[   17.723449]  [<ffffffff8114aace>] ? mod_timer+0x10/0x12
[   17.724705]  [<ffffffff81770002>] ? blk_add_timer+0xe0/0xe5
[   17.726088]  [<ffffffff81c2a35c>] nbd_queue_rq+0x7b/0x14b
[   17.727367]  [<ffffffff81c2a35c>] ? nbd_queue_rq+0x7b/0x14b
[   17.728653]  [<ffffffff81772b66>] __blk_mq_run_hw_queue+0x1c7/0x2c8
[   17.730118]  [<ffffffff81772942>] blk_mq_run_hw_queue+0x5e/0xbb
[   17.731454]  [<ffffffff81773d53>] blk_sq_make_request+0x1a1/0x1ba
[   17.732806]  [<ffffffff81768e24>] generic_make_request+0xbd/0x160
[   17.734153]  [<ffffffff81768fbd>] submit_bio+0xf6/0xff
[   17.735365]  [<ffffffff81252806>] submit_bh_wbc+0x136/0x143
[   17.736719]  [<ffffffff81252c00>] submit_bh+0x10/0x12
[   17.737888]  [<ffffffff81252c52>] __bread_gfp+0x50/0x6f
[   17.739212]  [<ffffffff812f290a>] ext4_fill_super+0x1f4/0x27ec
[   17.740492]  [<ffffffff81798a59>] ? vsnprintf+0x22d/0x3b7
[   17.741685]  [<ffffffff812265e3>] mount_bdev+0x144/0x197
[   17.742928]  [<ffffffff812f2716>] ? ext4_calculate_overhead+0x2bd/0x2bd
[   17.744275]  [<ffffffff812ede93>] ext4_mount+0x15/0x17
[   17.745406]  [<ffffffff81227049>] mount_fs+0x67/0x131
[   17.746518]  [<ffffffff8123ee2f>] vfs_kern_mount+0x6b/0xdb
[   17.747675]  [<ffffffff81241759>] do_mount+0x708/0x97d
[   17.748833]  [<ffffffff811e87f0>] ? __might_fault+0x7e/0x84
[   17.750074]  [<ffffffff811da511>] ? strndup_user+0x3f/0x53
[   17.751198]  [<ffffffff81268eb6>] compat_SyS_mount+0x185/0x1ae
[   17.752433]  [<ffffffff81003b6f>] do_int80_syscall_32+0x5c/0x6b
[   17.753592]  [<ffffffff82efa6d8>] entry_INT80_compat+0x38/0x50
[   17.754952] block nbd11: Attempted send on closed socket
[   17.756039] blk_update_request: I/O error, dev nbd11, sector 2





Thanks,
Xiaolong

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