Subject: [syzbot] linux-next boot error: WARNING in blk_mq_release

From: syzbot <[email-masked]>
Date: Wed, 29 Jun 2022 07:48:30 -0700

Hello,

syzbot found the following issue on:

HEAD commit:    c4ef528bd006 Add linux-next specific files for 20220629
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=115f9f4c080000
kernel config:  https://syzkaller.appspot.com/x/.config?x=39ac31f5c81daa7c
dashboard link: https://syzkaller.appspot.com/bug?extid=7582a7c7cf0affa6c9be
compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email-masked]

------------[ cut here ]------------
WARNING: CPU: 0 PID: 2226 at block/blk-mq.c:3876 blk_mq_release+0xf8/0x3e0 block/blk-mq.c:3876
Modules linked in:
CPU: 0 PID: 2226 Comm: kworker/0:3 Not tainted 5.19.0-rc4-next-20220629-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events blkg_free_workfn
RIP: 0010:blk_mq_release+0xf8/0x3e0 block/blk-mq.c:3876
Code: fd 4c 8d a3 a8 02 00 00 4c 89 e0 48 c1 e8 03 80 3c 28 00 0f 85 14 02 00 00 48 8b 83 a8 02 00 00 49 39 c4 75 b1 e8 28 af 97 fd <0f> 0b eb a8 e8 1f af 97 fd 48 8b 44 24 10 48 05 38 05 00 00 48 89
RSP: 0000:ffffc90009837ba0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88801bd5c000 RCX: 0000000000000000
RDX: ffff888024193a80 RSI: ffffffff83e307e8 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88801bd5c2a8
R13: ffff88801d898190 R14: ffff88801d898048 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff88823ffff000 CR3: 000000000ba8e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 blk_release_queue+0x15b/0x280 block/blk-sysfs.c:782
 kobject_cleanup lib/kobject.c:673 [inline]
 kobject_release lib/kobject.c:704 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x1be/0x4c0 lib/kobject.c:721
 blkg_free_workfn+0x128/0x210 block/blk-cgroup.c:96
 process_one_work+0x991/0x1610 kernel/workqueue.c:2289
 worker_thread+0x665/0x1080 kernel/workqueue.c:2436
 kthread+0x2e9/0x3a0 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
 </TASK>

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