WARNING in nvme_loop_reset_ctrl_work

Status: upstream: reported C repro on 2026/09/07 15:16
Subsystems: nvme
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+4a1d521d19d6321f5aad@syzkaller.appspotmail.com
Fix commit: c20bba234f3e nvme: do not reset controllers in NVME_CTRL_NEW state
Patched on: [ci-qemu-gce-upstream-auto ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 ci-snapshot-upstream-root ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-badwrites-root ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci-upstream-rust-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu-native-arm64-kvm ci-upstream-kmsan-gce-386-root ci-upstream-kmsan-gce-root]
First crash: 50d, last: 26d
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision
70b30434 patching 💥 WARNING in nvme_loop_reset_ctrl_work 2026/09/22 19:34 2026/09/22 19:34 2026/09/23 01:40 5207b90e
60162c85 patching 💥 WARNING in nvme_loop_reset_ctrl_work 2026/09/13 16:50 2026/09/13 16:50 2026/09/13 19:27 70a60e12
04f9dd59 repro-c Reproduced: ✅ ❓ WARNING in nvme_loop_reset_ctrl_work 2026/09/13 14:04 2026/09/13 14:04 2026/09/13 15:19 70a60e12
dadab4dc assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in nvme_loop_reset_ctrl_work 2026/09/05 00:09 2026/09/05 00:09 2026/09/05 00:14 7ce8fcf4
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [nvme?] WARNING in nvme_loop_reset_ctrl_work 4 (6) 2026/09/14 15:25
▶ ▼ Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/09/27 15:39 13m retest repro upstream report job log log
2026/09/13 15:20 13m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2f0c1cf72f4682178506f513bbf015e591b1aa4a report job log log

Sample crash report:
------------[ 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>

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/13 15:33 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 2f0c1cf72f46 6a988719 .config console log report C ci-qemu-upstream WARNING in nvme_loop_reset_ctrl_work
2026/09/03 15:56 upstream 940de590b839 6a988719 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in nvme_loop_reset_ctrl_work
2026/09/03 15:13 upstream 940de590b839 a8a356ea .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root WARNING in nvme_loop_reset_ctrl_work
* Struck through repros no longer work on HEAD.