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Date: Sun, 11 Sep 2016 20:06:28 +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>,
Stephen Rothwell <sfr@...b.auug.org.au>, lkp@...org
Subject: [lkp] [nbd] 3fabab1cec: BUG: unable to handle kernel NULL pointer
dereference at (null)
FYI, we noticed the following commit:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 3fabab1cec36f1873049de5dd05a9ed28ec168e2 ("nbd: add multi-connection support")
in testcase: boot
on test machine: qemu-system-x86_64 -enable-kvm -cpu Westmere -m 512M
caused below changes:
+-----------------------------------------------------------------------------+------------+------------+
| | 0eadf37afc | 3fabab1cec |
+-----------------------------------------------------------------------------+------------+------------+
| boot_successes | 2 | 4 |
| boot_failures | 12 | 10 |
| BUG:sleeping_function_called_from_invalid_context_at_kernel/locking/mutex.c | 10 | |
| calltrace:compat_SyS_mount | 10 | 10 |
| BUG:kernel_reboot-without-warning_in_test_stage | 2 | |
| BUG:unable_to_handle_kernel | 0 | 10 |
| Oops | 0 | 10 |
| RIP:nbd_queue_rq | 0 | 10 |
| Kernel_panic-not_syncing:Fatal_exception | 0 | 10 |
+-----------------------------------------------------------------------------+------------+------------+
[ 17.846260] floppy: error -5 while reading block 0
[ 17.870246] floppy: error -5 while reading block 0
[ 17.894227] floppy: error -5 while reading block 0
[ 17.904564] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 17.904571] IP: [<ffffffff81c2a3e8>] nbd_queue_rq+0x7f/0x349
[ 17.904574] PGD 35d14067 PUD 358b3067 PMD 0
[ 17.904576] Oops: 0000 [#1] SMP
[ 17.904578] Modules linked in:
[ 17.904581] CPU: 0 PID: 1009 Comm: mount Not tainted 4.8.0-rc4-00011-g3fabab1 #65
[ 17.904582] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[ 17.904583] task: ffff880035868300 task.stack: ffff880034ce4000
[ 17.904587] RIP: 0010:[<ffffffff81c2a3e8>] [<ffffffff81c2a3e8>] nbd_queue_rq+0x7f/0x349
[ 17.904589] RSP: 0000:ffff880034ce7a68 EFLAGS: 00010246
[ 17.904590] RAX: 0000000000000000 RBX: ffff88003d2d98b0 RCX: 0000000000000006
[ 17.904591] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000202
[ 17.904592] RBP: ffff880034ce7ae8 R08: 00000007857977bf R09: ffffffff8502fe60
[ 17.904593] R10: ffff880034ce78f0 R11: 0000000000000001 R12: ffff880034ce7b10
[ 17.904594] R13: ffff8800394f0170 R14: ffff880039335848 R15: ffff8800394f0000
[ 17.904597] FS: 0000000000000000(0000) GS:ffff88003f600000(0063) knlGS:00000000f77d96c0
[ 17.904598] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033
[ 17.904599] CR2: 0000000000000000 CR3: 0000000034e0e000 CR4: 00000000000006f0
[ 17.904603] Stack:
[ 17.904606] ffff880035868ba8 ffff880034ce7a80 0000000000000246 ffff880034ce7ac8
[ 17.904609] 0000000181123900 0000000000000246 ffff880035868b70 000000000000010f
[ 17.904612] ffffe8ffffc14500 ffff880034ce7b10 0000000000000000 ffff880039335800
[ 17.904613] Call Trace:
[ 17.904617] [<ffffffff81772b66>] __blk_mq_run_hw_queue+0x1c7/0x2c8
[ 17.904620] [<ffffffff81772942>] blk_mq_run_hw_queue+0x5e/0xbb
[ 17.904622] [<ffffffff81773d53>] blk_sq_make_request+0x1a1/0x1ba
[ 17.904626] [<ffffffff81768e24>] generic_make_request+0xbd/0x160
[ 17.904628] [<ffffffff81768fbd>] submit_bio+0xf6/0xff
[ 17.904632] [<ffffffff81252806>] submit_bh_wbc+0x136/0x143
[ 17.904634] [<ffffffff81252c00>] submit_bh+0x10/0x12
[ 17.904636] [<ffffffff81252c52>] __bread_gfp+0x50/0x6f
[ 17.904639] [<ffffffff812f290a>] ext4_fill_super+0x1f4/0x27ec
[ 17.904643] [<ffffffff81798a59>] ? vsnprintf+0x22d/0x3b7
[ 17.904647] [<ffffffff812265e3>] mount_bdev+0x144/0x197
[ 17.904649] [<ffffffff812f2716>] ? ext4_calculate_overhead+0x2bd/0x2bd
[ 17.904653] [<ffffffff812ede93>] ext4_mount+0x15/0x17
[ 17.904655] [<ffffffff81227049>] mount_fs+0x67/0x131
[ 17.904657] [<ffffffff8123ee2f>] vfs_kern_mount+0x6b/0xdb
[ 17.904659] [<ffffffff81241759>] do_mount+0x708/0x97d
[ 17.904663] [<ffffffff811e87f0>] ? __might_fault+0x7e/0x84
[ 17.904665] [<ffffffff811da511>] ? strndup_user+0x3f/0x53
[ 17.904668] [<ffffffff81268eb6>] compat_SyS_mount+0x185/0x1ae
[ 17.904671] [<ffffffff81003b6f>] do_int80_syscall_32+0x5c/0x6b
[ 17.904676] [<ffffffff82efb6d8>] entry_INT80_compat+0x38/0x50
[ 17.904705] Code: 74 1c f6 03 02 74 17 48 8b bb a8 01 00 00 48 c7 c6 0a 6e b1 83 48 81 c7 a0 00 00 00 eb 4b 49 63 97 78 01 00 00 48 8b 43 10 31 f6 <4c> 8b 34 d0 41 c7 87 04 01 00 00 00 00 00 00 4d 8d 66 08 4c 89
[ 17.904708] RIP [<ffffffff81c2a3e8>] nbd_queue_rq+0x7f/0x349
[ 17.904708] RSP <ffff880034ce7a68>
[ 17.904709] CR2: 0000000000000000
[ 17.904713] ---[ end trace 2dd9ac588a589f99 ]---
[ 17.904715] Kernel panic - not syncing: Fatal exception
Thanks,
Xiaolong
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