[syzbot] [nvme?] WARNING in nvme_loop_reset_ctrl_work

[syzbot] [nvme?] WARNING in nvme_loop_reset_ctrl_work

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    940de590b839 Merge tag 'hardening-v7.3-rc2' of git://git.k..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=150e2125580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b454dc6b1b7acd30
dashboard link: https://syzkaller.appspot.com/bug?extid=4a1d521d19d6321f5aad
compiler:       Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/465f56673f03/disk-940de590.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b8f5904c8659/vmlinux-940de590.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b2c5a5b98759/bzImage-940de590.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4a1d521d19d6321f5aad@syzkaller.appspotmail.com

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1
WARNING: drivers/nvme/target/loop.c:455 at nvme_loop_reset_ctrl_work+0x423/0x810 drivers/nvme/target/loop.c:455, CPU#0: kworker/u8:16/1478
Modules linked in:
CPU: 0 UID: 0 PID: 1478 Comm: kworker/u8:16 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: nvme-reset-wq nvme_loop_reset_ctrl_work
RIP: 0010:nvme_loop_reset_ctrl_work+0x423/0x810 drivers/nvme/target/loop.c:455
Code: 00 00 48 8b 44 24 18 8b 18 83 e3 fe bf 04 00 00 00 89 de e8 ef 30 d4 fb 83 fb 04 75 07 e8 d5 2b d4 fb eb 09 e8 ce 2b d4 fb 90 <0f> 0b 90 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 d7 fa 66 05
RSP: 0018:ffffc90007127a80 EFLAGS: 00010293
RAX: ffffffff85f24df2 RBX: 0000000000000002 RCX: ffff888025970000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f63bb0 R12: ffff888024bc4c18
R13: 1ffff11004978879 R14: dffffc0000000000 R15: ffff888024bc4000
FS:  0000000000000000(0000) GS:ffff888125bd5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f899ad0b840 CR3: 00000000390e0000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


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Re: [syzbot] [nvme?] WARNING in nvme_loop_reset_ctrl_work

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit:    2f0c1cf72f46 Merge tag 's390-7.3-3' of git://git.kernel.or..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
console output: https://syzkaller.appspot.com/x/log.txt?x=159b19f9580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f
dashboard link: https://syzkaller.appspot.com/bug?extid=4a1d521d19d6321f5aad
compiler:       gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1074f615580000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4a1d521d19d6321f5aad@syzkaller.appspotmail.com

------------[ cut here ]------------
1
WARNING: drivers/nvme/target/loop.c:455 at nvme_loop_reset_ctrl_work+0x1ad/0x5d0 drivers/nvme/target/loop.c:455, CPU#2: kworker/u33:1/38
Modules linked in:
CPU: 2 UID: 0 PID: 38 Comm: kworker/u33:1 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: nvme-reset-wq nvme_loop_reset_ctrl_work
RIP: 0010:nvme_loop_reset_ctrl_work+0x1ad/0x5d0 drivers/nvme/target/loop.c:455
Code: 7c 08 84 d2 0f 85 85 03 00 00 8b 9d dc f8 ff ff bf 01 00 00 00 83 eb 04 89 de e8 5e 1e 58 fb 83 fb 01 76 09 e8 e4 23 58 fb 90 <0f> 0b 90 e8 db 23 58 fb 48 83 c4 18 5b 5d 41 5c 41 5d 41 5e 41 5f
RSP: 0018:ffffc90000727bd8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 00000000fffffffd RCX: 0000000000000000
RDX: ffff88801c78cb00 RSI: ffffffff86b3f22c RDI: ffff88801c78cb00
RBP: ffff888028d84b10 R08: 0000000000000005 R09: 0000000000000001
R10: 00000000fffffffd R11: 0000000000000000 R12: ffff888028d843e8
R13: ffff888028d843ec R14: 0000000000000000 R15: ffff888027346800
FS:  0000000000000000(0000) GS:ffff8880d5d59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fde19ca5e9c CR3: 000000002206a000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>


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