INFO: task hung in nbd_ioctl (3)

Status: upstream: reported C repro on 2020/09/28 07:17
Subsystems: nbd
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+fe03c50d25c0188f7487@syzkaller.appspotmail.com
First crash: 2234d, last: 15d
Cause bisection: introduced by (bisect log) :
commit e9e006f5fcf2bab59149cb38a48a4817c1b538b4
Author: Mike Christie <mchristi@redhat.com>
Date: Sun Aug 4 19:10:06 2019 +0000

  nbd: fix max number of supported devs

Crash: INFO: task hung in nbd_ioctl (log)
Repro: syz .config
  
Fix bisection: fixed by (bisect log) [merge commit]:
commit da0628559871475b482f015dc24c9bef372936e4
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon Dec 14 20:05:10 2020 +0000

  Merge tag 'tomoyo-pr-20201214' of git://git.osdn.net/gitroot/tomoyo/tomoyo-test1

  
✨ AI-generated root cause summary:

An uninterruptible task hang occurs when an AF_INET SOCK_SEQPACKET (SCTP) socket is placed in listening state via listen() after being attached to an NBD device via ioctl(NBD_SET_SOCK). When ioctl(NBD_DO_IT) starts the device, recv_work() invokes sctp_recvmsg() -> sctp_skb_recv_datagram() -> sctp_wait_for_packet() in a kworker, where it blocks indefinitely in schedule_timeout(MAX_SCHEDULE_TIMEOUT) because UDP-style listening SCTP sockets permit receiving datagrams and kernel workers do not receive user signals. When nbd_start_device_ioctl() is interrupted and attempts error cleanup via sock_shutdown(), kernel_sock_shutdown(SHUT_RDWR) calls inet_shutdown(), which treats TCP_LISTEN / SCTP_SS_LISTENING sockets by calling sk->sk_prot->disconnect(), bypassing setting sk->sk_shutdown (RCV_SHUTDOWN). Because sctp_disconnect() is an unimplemented stub returning -EOPNOTSUPP, the socket remains in listening state without sk_shutdown set, causing the awakened worker in sctp_skb_recv_datagram() to immediately re-enter schedule_timeout(), deadlocking flush_workqueue() in nbd_start_device_ioctl().

▶ ▼ ✨ Full AI root cause analysis
Based on kernel commit f4345f05c0df:

Root Cause Analysis

1. Components and Files Involved

  • drivers/block/nbd.c:
    • Functions: nbd_add_socket(), nbd_get_socket(), nbd_start_device(), nbd_start_device_ioctl(), recv_work(), sock_shutdown(), nbd_mark_nsock_dead()
    • Structs & Fields: struct nbd_device::recv_workq, struct nbd_config::recv_threads, struct nbd_config::recv_wq, struct recv_thread_args::work
  • net/sctp/socket.c:
    • Functions: sctp_inet_listen(), sctp_listen_start(), sctp_recvmsg(), sctp_skb_recv_datagram(), sctp_wait_for_packet(), sctp_disconnect()
    • Structs & Fields: struct sock::sk_state (SCTP_SS_LISTENING), struct sock::sk_shutdown, struct sctp_sock::type (SCTP_SOCKET_UDP)
  • net/ipv4/af_inet.c:
    • Function: inet_shutdown()

2. Trigger Sequence and Mechanism

  1. Socket Setup and Listening State:

    • Userspace opens /dev/nbd0 and creates an AF_INET, SOCK_SEQPACKET socket (IPPROTO_SCTP).
    • The socket is passed to ioctl(nbd_fd, NBD_SET_SOCK, sock_fd) (nbd_add_socket()). At this stage, nbd_get_socket() only verifies sock->ops->shutdown != sock_no_shutdown, which passes because SCTP sets .shutdown = inet_shutdown.
    • Userspace then executes listen(sock_fd, backlog) on the socket. This invokes sctp_inet_listen() -> sctp_listen_start(), which sets sk->sk_state = SCTP_SS_LISTENING (which numerically equals TCP_LISTEN = 10).
    • Userspace then invokes ioctl(nbd_fd, NBD_DO_IT) (nbd_start_device_ioctl()).

  2. Kworker Blocks Indefinitely in sctp_recvmsg():

    • nbd_start_device() queues recv_work on nbd->recv_workq, increments config->recv_threads, and returns.
    • The worker thread (kworker/u9:1) executes recv_work(), which calls nbd_read_reply() -> __sock_xmit() -> sock_recvmsg().
    • This invokes inet_recvmsg() -> sctp_recvmsg(). Unlike stream-oriented TCP sockets, UDP-style SCTP sockets (SCTP_SOCKET_UDP) permit recvmsg() while in SCTP_SS_LISTENING state (waiting for incoming associations or datagrams on the endpoint).
    • In sctp_skb_recv_datagram(), with an empty receive queue, it enters sctp_wait_for_packet(): 
      if (list_empty(&sctp_sk(sk)->ep->asocs) && !sctp_sstate(sk, LISTENING))
    goto out;
      Because sctp_sstate(sk, LISTENING) is true, it does not abort with -ENOTCONN.
    • sctp_wait_for_packet() calls schedule_timeout(MAX_SCHEDULE_TIMEOUT) (since NBD only sets sk_sndtimeo, leaving sk_rcvtimeo at maximum). Because the worker thread is a kernel thread, signal_pending(current) is always false, causing the kworker to sleep indefinitely.

  3. Interruption and Ineffective kernel_sock_shutdown():

    • In nbd_start_device_ioctl(), the user thread waits on wait_event_interruptible(config->recv_wq, atomic_read(&config->recv_threads) == 0).
    • When the user thread receives a signal or terminates, wait_event_interruptible() returns non-zero (ret = -ERESTARTSYS).
    • nbd_start_device_ioctl() calls sock_shutdown(nbd) -> nbd_mark_nsock_dead() -> kernel_sock_shutdown(nsock->sock, SHUT_RDWR) to abort any active receiver and unblock the worker before calling flush_workqueue(nbd->recv_workq).
    • kernel_sock_shutdown() calls inet_shutdown(sock, SHUT_RDWR). In inet_shutdown(), it checks sk->sk_state: 
      switch (sk->sk_state) {
case TCP_CLOSE:
    ...
default:
    WRITE_ONCE(sk->sk_shutdown, sk->sk_shutdown | how);
    if (sk->sk_prot->shutdown)
        sk->sk_prot->shutdown(sk, how);
    break;
case TCP_LISTEN:
    if (!(how & RCV_SHUTDOWN))
        break;
    fallthrough;
case TCP_SYN_SENT:
    err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
    sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
    break;
}
    • Because sk->sk_state == SCTP_SS_LISTENING (TCP_LISTEN), it takes the case TCP_LISTEN: branch and never hits default:. Therefore, sk->sk_shutdown is not set with RCV_SHUTDOWN.
    • Instead, inet_shutdown() calls sk->sk_prot->disconnect(sk, O_NONBLOCK). For SCTP, sctp_prot.disconnect is sctp_disconnect(): 
      static int sctp_disconnect(struct sock *sk, int flags)
{
    return -EOPNOTSUPP; /* STUB */
}
      sctp_disconnect() is a stub that returns -EOPNOTSUPP and does nothing: it does not change sk->sk_state to closed, does not set sk->sk_err, and does not clear the listening state.

  4. Deadlock in flush_workqueue():

    • At the end of inet_shutdown(), sk->sk_state_change(sk) wakes up the wait queue sk_sleep(sk).
    • The kworker in sctp_wait_for_packet() wakes up and returns 0 to sctp_skb_recv_datagram().
    • The do { ... } while (sctp_wait_for_packet(...) == 0); loop in sctp_skb_recv_datagram() checks exit conditions:
      • error = sock_error(sk) is 0.
      • sk->sk_shutdown & RCV_SHUTDOWN is 0.
      • timeo is still positive.
    • It immediately loops and calls sctp_wait_for_packet() again. In sctp_wait_for_packet(), sctp_sstate(sk, LISTENING) remains true, sk->sk_shutdown remains 0, and signal_pending() is false. It goes directly back to sleep in schedule_timeout(timeo) for the remaining duration.
    • Meanwhile, nbd_start_device_ioctl() executes flush_workqueue(nbd->recv_workq), waiting for recv_work to finish. Because recv_work is stuck sleeping in sctp_wait_for_packet(), flush_workqueue() hangs indefinitely in state D (TASK_UNINTERRUPTIBLE), triggering the hung task timeout.
▶ ▼ ✨ AI Jobs (10)
ID Workflow Result Correct Bug Created Started Finished Revision
f472837e assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ FuzzingArtifact: ❌ MemoryCorruption: ❌ NetworkNeedsSetup: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: task hung in nbd_ioctl (3) 2026/11/09 05:41 2026/11/09 05:41 2026/11/09 06:40 5cecaf1f
b69d7117 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/10/09 04:25 2026/10/09 04:25 2026/10/09 04:45 723be09b
80e16a7b assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/09/09 03:45 2026/09/09 03:45 2026/09/09 04:05 243b72f1
453b0c01 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/08/09 22:20 2026/08/09 22:20 2026/08/09 22:33 5d63f80b
901c62e4 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/07/09 01:27 2026/07/09 01:27 2026/07/09 01:49 93f57954
0a32d87b assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/06/22 03:10 2026/06/22 03:10 2026/06/22 03:33 43bfcdb0
71a95d68 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/06/14 02:39 2026/06/14 02:39 2026/06/14 03:04 4f06757f
0a119cb1 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/06/09 18:26 2026/06/09 18:26 2026/06/09 18:42 c36c07f6
986fce2f assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/06/02 15:41 2026/06/02 15:41 2026/06/02 16:11 62fe1528
f28b1a81 assessment-security 💥 INFO: task hung in nbd_ioctl (3) 2026/05/25 20:47 2026/05/25 20:47 2026/05/25 21:07 c69befb3
▶ ▼ Discussions (8)
Title Replies (including bot) Last reply
[syzbot] Monthly nbd report (Oct 2025) 0 (1) 2025/10/06 17:29
[syzbot] Monthly nbd report (Sep 2025) 0 (1) 2025/09/03 12:36
[syzbot] Monthly nbd report (Jul 2025) 0 (1) 2025/07/02 13:32
[syzbot] Monthly nbd report (Jun 2025) 0 (1) 2025/06/03 11:07
[syzbot] Monthly nbd report (Jan 2025) 0 (1) 2025/01/27 11:15
[syzbot] Monthly nbd report (Dec 2024) 0 (1) 2024/12/25 10:07
[syzbot] Monthly nbd report (Sep 2024) 0 (1) 2024/09/14 10:58
INFO: task hung in nbd_ioctl (3) 0 (3) 2021/02/16 06:36
▶ ▼ Similar bugs (9)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.14 INFO: task hung in nbd_ioctl 1 syz, C done 18 2510d 2584d 1/1 fixed on 2019/12/28 10:32
linux-4.14 INFO: task hung in nbd_ioctl (2) 1 syz, C done 16 2257d 2502d 1/1 fixed on 2020/10/21 11:01
upstream INFO: task hung in nbd_ioctl (2) nbd 1 37 2264d 2317d 15/29 fixed on 2020/09/25 01:17
upstream INFO: task hung in nbd_ioctl nbd 1 syz, C done 71 2561d 2597d 13/29 fixed on 2019/11/06 12:39
linux-5.15 INFO: task hung in nbd_ioctl origin:upstream 1 syz, C error 13 2d21h 1232d 0/3 upstream: reported C repro on 2023/06/26 06:58
linux-6.1 INFO: task hung in nbd_ioctl 1 syz, C error 7 666d 1296d 0/3 auto-obsoleted due to no activity on 2025/10/23 04:49
linux-4.19 INFO: task hung in nbd_ioctl 1 syz, C error 79 1371d 2585d 0/1 upstream: reported C repro on 2019/10/12 13:11
linux-4.14 INFO: task hung in nbd_ioctl (3) 1 syz, C inconclusive 12 1636d 2187d 0/1 upstream: reported C repro on 2020/11/13 07:37
upstream INFO: task can't die in nbd_ioctl nbd 1 syz, C done 7 506d 2226d 0/29 auto-obsoleted due to no activity on 2025/11/09 04:26
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/09/12 10:03 22m retest repro upstream report job log log
2026/09/12 10:03 21m retest repro upstream report job log log
2026/07/03 00:27 42m retest repro upstream log
2026/07/03 00:27 25m retest repro upstream log
2026/04/20 17:10 28m retest repro upstream report log
2026/04/20 16:45 25m retest repro upstream report log
2026/04/20 16:45 22m retest repro upstream report log
2026/02/09 12:17 28m retest repro upstream report log
2026/02/09 12:17 16m retest repro upstream report log
2025/12/25 00:30 40m retest repro git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci no crash log
▶ ▼ Fix bisection attempts (4)
Created Duration User Patch Repo Result
2021/01/27 11:14 3h55m bisect fix upstream OK (1) job log
2020/12/28 10:47 27m bisect fix upstream OK (0) job log log
2020/11/28 10:22 23m bisect fix upstream OK (0) job log log
2020/10/29 09:54 22m bisect fix upstream OK (0) job log log

Sample crash report:
INFO: task syz-executor360:5073 blocked for more than 143 seconds.
      Not tainted 6.9.0-rc7-syzkaller-00136-gf4345f05c0df #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor360 state:D stack:25464 pid:5073  tgid:5073  ppid:5072   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2558
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common kernel/sched/completion.c:127 [inline]
 wait_for_completion+0x355/0x620 kernel/sched/completion.c:148
 __flush_workqueue+0x7d6/0x1710 kernel/workqueue.c:4007
 nbd_start_device_ioctl drivers/block/nbd.c:1463 [inline]
 __nbd_ioctl drivers/block/nbd.c:1524 [inline]
 nbd_ioctl+0xbd1/0xf40 drivers/block/nbd.c:1564
 blkdev_ioctl+0x5e5/0x740 block/ioctl.c:642
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f711f084879
RSP: 002b:00007ffcf3e105c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f711f084879
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00007f711f0f75f0 R08: 0000000000000006 R09: 0000000000000006
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000001
R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e334da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by kworker/u9:1/4472:
 #0: ffff888020975148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff888020975148 ((wq_completion)nbd0-recv){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc9000d7afd00 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc9000d7afd00 ((work_completion)(&args->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
2 locks held by getty/4827:
 #0: ffff88802acd70a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f0e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.9.0-rc7-syzkaller-00136-gf4345f05c0df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfde/0x1020 kernel/hung_task.c:380
 kthread+0x2f0/0x390 kernel/kthread.c:388
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4517 Comm: klogd Not tainted 6.9.0-rc7-syzkaller-00136-gf4345f05c0df #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:PageTail include/linux/page-flags.h:285 [inline]
RIP: 0010:const_folio_flags include/linux/page-flags.h:313 [inline]
RIP: 0010:folio_test_slab include/linux/page-flags.h:527 [inline]
RIP: 0010:virt_to_slab mm/kasan/../slab.h:206 [inline]
RIP: 0010:qlink_to_cache+0x2a/0xb0 mm/kasan/quarantine.c:131
Code: e8 fb 23 4b ff 48 c1 e8 06 48 83 e0 c0 48 ba 00 00 00 00 00 ea ff ff 48 8b 4c 10 08 f6 c1 01 75 44 48 01 d0 66 90 48 8b 48 08 <f6> c1 01 75 65 66 90 48 8b 08 48 c1 e1 34 48 c1 f9 3f 48 21 c1 48
RSP: 0018:ffffc90003957680 EFLAGS: 00000286
RAX: ffffea0000939800 RBX: ffff888024e64400 RCX: ffff888015eeb8c0
RDX: ffffea0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888021326400 R08: ffffffff81429ccc R09: ffffffff81f77223
R10: dffffc0000000000 R11: fffffbfff25dfca6 R12: 0000000000000000
R13: ffff888024e64400 R14: ffffc900039576b8 R15: 0000000000000000
FS:  00007f4b5527e380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f632efb8580 CR3: 000000007c59e000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 qlist_free_all+0x2e/0xc0 mm/kasan/quarantine.c:176
 kasan_quarantine_reduce+0x14f/0x170 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x23/0x80 mm/kasan/common.c:322
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3804 [inline]
 slab_alloc_node mm/slub.c:3851 [inline]
 kmem_cache_alloc_node+0x194/0x390 mm/slub.c:3894
 __alloc_skb+0x1c3/0x440 net/core/skbuff.c:658
 alloc_skb include/linux/skbuff.h:1313 [inline]
 alloc_skb_with_frags+0xc3/0x770 net/core/skbuff.c:6515
 sock_alloc_send_pskb+0x91a/0xa60 net/core/sock.c:2795
 unix_dgram_sendmsg+0x6d3/0x1f80 net/unix/af_unix.c:2019
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b553e09b5
Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffff2645788 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f4b553e09b5
RDX: 000000000000004c RSI: 000055e37aef0d80 RDI: 0000000000000003
RBP: 000055e37aeec910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013
R13: 00007f4b5556e212 R14: 00007ffff2645888 R15: 0000000000000000
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.320 msecs

Crashes (149):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/11 08:54 upstream f4345f05c0df 9026e142 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/05/11 07:13 upstream f4345f05c0df 9026e142 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2023/03/01 05:08 upstream ae3419fbac84 95aee97a .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2025/06/01 19:37 upstream bb1556ec9464 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/06/01 18:10 upstream 7d4e49a77d99 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/05/31 21:14 upstream dee264c16a63 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/03/22 23:44 upstream 88d324e69ea9 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/03/22 06:55 upstream 88d324e69ea9 c6512ef7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2025/03/16 19:30 upstream 31d7109a19f6 e2826670 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/03/12 15:49 upstream 0fed89a961ea ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/02/28 14:42 upstream 76544811c850 1e7a43e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2025/01/06 17:42 upstream 5428dc1906dd f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2025/01/06 13:58 upstream ab75170520d4 f3558dbf .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/12/08 03:17 upstream 7503345ac5f5 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/12/08 01:47 upstream 7503345ac5f5 9ac0fdc6 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/09/01 02:27 upstream e8784b0aef62 1eda0d14 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/07/07 11:16 upstream 22f902dfc51e bc4ebbb5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/05/02 00:50 upstream 18daea77cca6 3ba885bc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/04/25 17:33 upstream e88c4cfcb7b8 8bdc0f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/04/04 10:31 upstream fe46a7dd189e 51c4dcff .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2024/04/02 04:50 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/04/02 03:18 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/04/02 00:56 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/04/01 03:09 upstream fe46a7dd189e 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/03/30 01:14 upstream fe46a7dd189e c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2024/03/28 09:58 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/03/27 15:44 upstream fe46a7dd189e 454571b6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/03/26 18:19 upstream fe46a7dd189e bcd9b39f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/03/25 19:33 upstream fe46a7dd189e 0ea90952 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/03/20 11:51 upstream fe46a7dd189e a485f239 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2024/03/17 22:07 upstream fe46a7dd189e d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/03/17 03:06 upstream fe46a7dd189e d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/03/16 11:25 upstream fe46a7dd189e d615901c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2024/03/13 10:11 upstream 9187210eee7d db5b7ff0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2024/02/11 12:17 upstream 7521f258ea30 77b23aa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/02/03 09:09 upstream 6897cea71837 60bf9982 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/01/27 23:23 upstream 3a5879d495b2 cc4a4020 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2024/01/17 11:59 upstream 052d534373b7 2a7bcc7f .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2024/01/17 10:18 upstream 052d534373b7 2a7bcc7f .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2023/11/21 15:41 upstream 98b1cc82c4af cb976f63 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2023/10/17 23:02 upstream 213f891525c2 342b9c55 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2023/10/17 22:08 upstream 213f891525c2 342b9c55 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2023/07/07 15:07 upstream a452483508d7 22ae5830 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2023/05/18 12:38 upstream 1b66c114d161 3bb7af1d .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2021/12/13 16:48 upstream 2585cf9dfaad 49ca1f59 .config console log report syz C ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2021/09/11 01:33 upstream bf9f243f23e6 5ae8508a .config console log report syz C ci-upstream-kasan-gce-selinux-root INFO: task hung in nbd_ioctl
2021/08/23 04:25 upstream 1bdc3d5be7e1 b599f2fc .config console log report syz C ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2021/08/08 15:31 upstream 85a90500f9a1 6972b106 .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2021/07/23 11:54 upstream 9bead1b58c4c bc5f1d88 .config console log report syz C ci-upstream-kasan-gce-root INFO: task hung in nbd_ioctl
2021/02/16 06:35 upstream f40ddce88593 98682e5e .config console log report syz C ci-upstream-kasan-gce-smack-root INFO: task hung in nbd_ioctl
2025/06/01 12:09 upstream 4cb6c8af8591 3d2f584d .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 INFO: task hung in nbd_ioctl
2024/05/25 18:53 upstream 56fb6f92854f a10a183e .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm64 INFO: task hung in nbd_ioctl
2024/04/09 04:56 upstream fec50db7033e f3234354 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-arm32 INFO: task hung in nbd_ioctl
2026/10/25 19:47 linux-next 20a33c6b6cbe 1d9ca40b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2026/09/30 04:25 linux-next 6474fa070f2b 7808aef4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/09/08 04:39 linux-next be5d4872e528 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/09/06 16:11 linux-next be5d4872e528 d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/09/05 06:45 linux-next 4ac65880ebca d291dd2d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/07/23 11:57 linux-next d086c886ceb9 e1dd4f22 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/07/06 10:37 linux-next 26ffb3d6f02c 4f67c4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nbd_ioctl
2025/06/29 17:21 linux-next 2aeda9592360 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2024/12/08 05:14 linux-next af2ea8ab7a54 9ac0fdc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2024/04/01 15:43 linux-next a6bd6c933339 6baf5069 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2024/03/29 13:54 linux-next a6bd6c933339 c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2024/02/09 00:33 linux-next b1d3a0e70c38 7f07e9b0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2024/01/13 01:48 linux-next 8d04a7e2ee3f dda5a988 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2023/04/01 21:42 linux-next 4b0f4525dc4f f325deb0 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2023/01/28 08:38 linux-next e2f86c02fdc9 9dfcf09c .config strace log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nbd_ioctl
2026/10/22 08:42 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 7a19f0cc94ad 4ba27f85 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/08/05 06:24 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci c912bf709078 1786a2a8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/03/29 16:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 c52bcb23 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/03/28 20:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 120789fd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/03/21 21:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 707081b61156 6753db5c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/01/24 04:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca 1e153dc8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/01/15 22:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca 2a7bcc7f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/01/14 04:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2024/01/13 18:50 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca 551587c1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2023/11/13 22:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8de1e7afcc1c cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2023/11/13 16:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 8de1e7afcc1c 6d6dbf8a .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2023/06/26 09:01 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci e40939bbfc68 09ffe269 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in nbd_ioctl
2020/09/29 09:51 upstream fb0155a09b02 1b88c6d5 .config console log report syz ci-upstream-kasan-gce-selinux-root
2020/09/28 04:35 upstream a1bffa48745a 5dd8aee8 .config console log report syz ci-upstream-kasan-gce-root
* Struck through repros no longer work on HEAD.