WARNING in nvmet_fc_portentry_rebind_tgt

Status: upstream: reported C repro on 2026/10/16 12:10
Subsystems: nvme
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+be62d4b375542ecebd17@syzkaller.appspotmail.com
First crash: 4d01h, last: 1d07h
▶ ▼ ✨ AI Jobs (2)
ID Workflow Result Correct Bug Created Started Finished Revision
122321c3 repro-c Reproduced: ✅ ❓ WARNING in nvmet_fc_portentry_rebind_tgt 2026/10/15 02:12 2026/10/15 02:13 2026/10/15 03:08 8fb0ae89
85e082d4 assessment-security DenialOfService: ✅ Exploitable: ✅ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ WARNING in nvmet_fc_portentry_rebind_tgt 2026/10/14 00:34 2026/10/14 00:34 2026/10/14 01:19 7321cd29
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [nvme?] WARNING in nvmet_fc_portentry_rebind_tgt 0 (1) 2026/10/16 12:10
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/10/15 05:26 25m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4056b3c9d3c92ea45955641dbafeb9b960e146ef report job log log

Sample crash report:
------------[ cut here ]------------
pe->tgtport
WARNING: drivers/nvme/target/fc.c:1327 at nvmet_fc_portentry_rebind_tgt+0x1d7/0x1e0 drivers/nvme/target/fc.c:1327, CPU#1: syz-executor148/5937
Modules linked in:
CPU: 1 UID: 0 PID: 5937 Comm: syz-executor148 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026
RIP: 0010:nvmet_fc_portentry_rebind_tgt+0x1d7/0x1e0 drivers/nvme/target/fc.c:1327
Code: 6d 3d fc 48 8b 04 24 49 89 06 48 c7 c7 20 0f c8 8f 48 83 c4 18 5b 41 5c 41 5d 41 5e 41 5f 5d e9 3f ab 66 05 e8 ba a7 d0 fb 90 <0f> 0b 90 eb a6 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000155fa78 EFLAGS: 00010293
RAX: ffffffff85f63196 RBX: dffffc0000000000 RCX: ffff888032880000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffff520002abf40 R12: 1ffff1100741b8d0
R13: 0000000000000001 R14: ffff88803a0dc680 R15: ffff888012526800
FS:  00007f3c0db506c0(0000) GS:ffff888124abb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3c0db4fff8 CR3: 0000000042756000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 nvmet_fc_register_targetport+0x75a/0x950 drivers/nvme/target/fc.c:1417
 fcloop_create_target_port+0x135/0x4d0 drivers/nvme/target/fcloop.c:1558
 kernfs_fop_write_iter+0x3a5/0x540 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61e/0xbb0 fs/read_write.c:687
 ksys_write+0x156/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c0e3ae35e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007f3c0db50118 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3c0db506c0 RCX: 00007f3c0e3ae35e
RDX: 000000000000002f RSI: 00007f3c0e427b40 RDI: 0000000000000004
RBP: 00007f3c0e427b40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: ffffffffffffffd0
R13: 0000000000000010 R14: 00007ffdb343b7d0 R15: 00007ffdb343b8b8
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/10/15 05:52 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 4056b3c9d3c9 4f92358f .config console log report C ci-upstream-kasan-gce-smack-root WARNING in nvmet_fc_portentry_rebind_tgt
2026/10/12 12:02 upstream 24a19b953e2a 4f92358f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root WARNING in nvmet_fc_portentry_rebind_tgt
* Struck through repros no longer work on HEAD.