linux-kernel - [lkp] [blk] 9f9093afaf: kernel BUG at block/blk-mq.c:365!

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Date:	Mon, 1 Aug 2016 14:11:30 +0800
From:	kernel test robot <xiaolong.ye@...el.com>
To:	Jens Axboe <axboe@...com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Jens Axboe <axboe@...com>,
	Jens Axboe <axboe@...nel.dk>, lkp@...org
Subject: [lkp] [blk]  9f9093afaf: kernel BUG at block/blk-mq.c:365!


FYI, we noticed the following commit:

https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git blk-dio
commit 9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b ("blk-mq: private O_DIRECT implementation")

in testcase: boot

on test machine: 2 threads qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap with 2G memory

caused below changes:


+-------------------------------------------------------+------------+------------+
|                                                       | 0e06f5c0de | 9f9093afaf |
+-------------------------------------------------------+------------+------------+
| boot_successes                                        | 136        | 62         |
| boot_failures                                         | 0          | 73         |
| BUG:unable_to_handle_kernel                           | 0          | 49         |
| Oops                                                  | 0          | 49         |
| RIP:blk_update_request                                | 0          | 32         |
| Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 0          | 73         |
| RIP:__blk_recalc_rq_segments                          | 0          | 19         |
| backtrace:vfs_read                                    | 0          | 16         |
| backtrace:SyS_read                                    | 0          | 16         |
| backtrace:vfs_llseek                                  | 0          | 2          |
| backtrace:SyS_lseek                                   | 0          | 4          |
| kernel_BUG_at_block/blk-mq.c                          | 0          | 22         |
| invalid_opcode:#[##]SMP                               | 0          | 22         |
| RIP:blk_mq_end_request                                | 0          | 22         |
| general_protection_fault:#[##]SMP                     | 0          | 2          |
| backtrace:SyS_newfstat                                | 0          | 2          |
| backtrace:SyS_ioctl                                   | 0          | 3          |
+-------------------------------------------------------+------------+------------+



         Starting Copy rules generated while the root was ro...
         Starting LSB: MD array assembly...
[   11.626304] ------------[ cut here ]------------
[   11.628118] kernel BUG at block/blk-mq.c:365!
[   11.632175] invalid opcode: 0000 [#1] SMP
[   11.637668] Modules linked in:
[   11.639205] CPU: 0 PID: 2175 Comm: mdadm Not tainted 4.7.0-03200-g9f9093a #1
[   11.643243] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
[   11.650426] task: ffff88007eae0dc0 ti: ffff88007f814000 task.ti: ffff88007f814000
[   11.655392] RIP: 0010:[<ffffffff814cadec>]  [<ffffffff814cadec>] blk_mq_end_request+0x1e/0x5c
[   11.665009] RSP: 0000:ffff880078803f20  EFLAGS: 00010002
[   11.666863] RAX: 0000000000000001 RBX: ffff88007fab0000 RCX: 0000000000000000
[   11.672882] RDX: ffff88007f7b6000 RSI: 0000000000000000 RDI: 0000000000000000
[   11.674849] RBP: ffff880078803f30 R08: ffff88005c2d6e18 R09: 0000000000000000
[   11.683957] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   11.685930] R13: ffff88007fab0000 R14: ffffffff81ea9f36 R15: 0000000000000000
[   11.687896] FS:  00007f2286125700(0000) GS:ffff880078800000(0000) knlGS:0000000000000000
[   11.690695] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.712461] CR2: 0000000001623d88 CR3: 000000007eca6000 CR4: 00000000000406f0
[   11.714451] Stack:
[   11.715542]  ffff88007fab0010 ffffffff814c9b0e ffff880078803f40 ffffffff815cc751
[   11.718637]  ffff880078803f50 ffffffff814c9b21 ffff880078803f88 ffffffff8116c346
[   11.739752]  0000000000000000 0000000000000000 0000000000000001 0000000000000001
[   11.742821] Call Trace:
[   11.743980]  <IRQ> 
[   11.744418]  [<ffffffff814c9b0e>] ? __blk_mq_end_request+0x44/0x44
[   11.746998]  [<ffffffff815cc751>] virtblk_request_done+0x5e/0x60
[   11.748775]  [<ffffffff814c9b21>] __blk_mq_complete_request_remote+0x13/0x15
[   11.750755]  [<ffffffff8116c346>] flush_smp_call_function_queue+0xcd/0x13e
[   11.765696]  [<ffffffff8116cbe8>] generic_smp_call_function_single_interrupt+0x13/0x4a
[   11.768446]  [<ffffffff81078064>] smp_call_function_single_interrupt+0x27/0x35
[   11.771070]  [<ffffffff81a9985c>] call_function_single_interrupt+0x8c/0xa0
[   11.772982]  <EOI> 
[   11.773415] Code: 48 83 c4 28 5b 41 5c 41 5d 41 5e 5d c3 0f 1f 44 00 00 55 48 89 e5 41 54 53 8b 57 58 48 89 fb 41 89 f4 e8 cc 7c ff ff 84 c0 74 02 <0f> 0b 48 89 df e8 cd 7f ff ff 48 8b 83 98 01 00 00 48 85 c0 74 
[   11.799220] RIP  [<ffffffff814cadec>] blk_mq_end_request+0x1e/0x5c
[   11.801131]  RSP <ffff880078803f20>
[   11.802469] ---[ end trace 58ac7b630a6d0c87 ]---
[   11.804084] Kernel panic - not syncing: Fatal exception in interrupt


FYI, raw QEMU command line is:

	qemu-system-x86_64 -enable-kvm -cpu Haswell,+smep,+smap -kernel /pkg/linux/x86_64-lkp/gcc-6/9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b/vmlinuz-4.7.0-03200-g9f9093a -append 'ip=::::vm-kbuild-2G-3::dhcp root=/dev/ram0 user=lkp job=/lkp/scheduled/vm-kbuild-2G-3/boot-1-debian-x86_64-2015-02-07.cgz-9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b-20160731-116574-1tj3h35-63.yaml ARCH=x86_64 kconfig=x86_64-lkp branch=linux-devel/devel-hourly-2016073021 commit=9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b BOOT_IMAGE=/pkg/linux/x86_64-lkp/gcc-6/9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b/vmlinuz-4.7.0-03200-g9f9093a max_uptime=600 RESULT_ROOT=/result/boot/1/vm-kbuild-2G/debian-x86_64-2015-02-07.cgz/x86_64-lkp/gcc-6/9f9093afaff2c4d247e5bc7d25ec0574e3f8d12b/63 LKP_SERVER=inn debug apic=debug sysrq_always_enabled rcupdate.rcu_cpu_stall_timeout=100 panic=-1 softlockup_panic=1 nmi_watchdog=panic oops=panic load_ramdisk=2 prompt_ramdisk=0 systemd.log_level=err ignore_loglevel earlyprintk=ttyS0,115200 console=ttyS0,115200 console=tty0 vga=normal rw'  -initrd /fs/sdc1/initrd-vm-kbuild-2G-3 -m 2048 -smp 2 -device e1000,netdev=net0 -netdev user,id=net0,hostfwd=tcp::23018-:22 -boot order=nc -no-reboot -watchdog i6300esb -watchdog-action debug -rtc base=localtime -drive file=/fs/sdc1/disk0-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk1-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk2-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk3-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk4-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk5-vm-kbuild-2G-3,media=disk,if=virtio -drive file=/fs/sdc1/disk6-vm-kbuild-2G-3,media=disk,if=virtio -pidfile /dev/shm/kboot/pid-vm-kbuild-2G-3 -serial file:/dev/shm/kboot/serial-vm-kbuild-2G-3 -daemonize -display none -monitor null 





Thanks,
Xiaolong

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