Hello,
syzbot found the following issue on:
HEAD commit: 8100a580 Merge tag 'x86-urgent-2020-12-06' of git://
git.ke..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=1797914b500000
kernel config:
https://syzkaller.appspot.com/x/.config?x=4e0bdb085ef78711
dashboard link:
https://syzkaller.appspot.com/bug?extid=aa59aa6a6bf98f62c776
compiler: clang version 12.0.0 (
https://github.com/llvm/llvm-project.git 913f6005669cfb590c99865a90bc51ed0983d09d)
CC: [
ax...@kernel.dk linux...@vger.kernel.org linux-...@vger.kernel.org]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+aa59aa...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in __blk_mq_sched_dispatch_requests / blk_mq_request_bypass_insert
write to 0xffff8881023ca810 of 8 bytes by task 2981 on cpu 0:
__list_add include/linux/list.h:70 [inline]
list_add include/linux/list.h:86 [inline]
blk_mq_request_bypass_insert+0x6a/0x130 block/blk-mq.c:1857
blk_mq_sched_insert_request+0x12c/0x280 block/blk-mq-sched.c:450
blk_mq_requeue_work+0x37b/0x490 block/blk-mq.c:813
process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
worker_thread+0x635/0xb90 kernel/workqueue.c:2418
kthread+0x1fd/0x220 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
read to 0xffff8881023ca810 of 8 bytes by task 2982 on cpu 1:
list_empty_careful include/linux/list.h:319 [inline]
__blk_mq_sched_dispatch_requests+0xb1/0x2a0 block/blk-mq-sched.c:286
blk_mq_sched_dispatch_requests+0x8f/0xf0 block/blk-mq-sched.c:341
__blk_mq_run_hw_queue+0xee/0x1c0 block/blk-mq.c:1532
blk_mq_run_work_fn+0x3d/0x50 block/blk-mq.c:1810
process_one_work+0x3e1/0x950 kernel/workqueue.c:2272
worker_thread+0x635/0xb90 kernel/workqueue.c:2418
kthread+0x1fd/0x220 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 2982 Comm: kworker/1:1H Not tainted 5.10.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: kblockd blk_mq_run_work_fn
==================================================================
---
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