syzbot


INFO: task hung in nfsd_nl_listener_get_doit

Status: upstream: reported on 2024/06/15 10:39
Subsystems: nfs
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+4207adf14e7c0981d28d@syzkaller.appspotmail.com
First crash: 755d, last: 1h51m
✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision Error
3c478234-ddca-44bc-bcfe-8c2421a0466d assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ INFO: task hung in nfsd_nl_listener_get_doit 2026/06/01 04:33 2026/06/01 04:33 2026/06/01 05:25 6b4a844333e83556da95d61d7f207e7ef5cd4bc6

			
		
d2e82c30-1c09-403f-8dc4-23822acf8a2d assessment-security 💥 INFO: task hung in nfsd_nl_listener_get_doit 2026/05/15 10:21 2026/05/15 10:21 2026/05/15 10:21 9cd3beaadf14b3a22d15fd97a0bf081ee41ebe01
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/492726895af570c3c8...
truncated to first 200 bytes; open job for full error
6f93eda4-1313-49bc-98ef-72ceefbd777b repro INFO: task hung in nfsd_nl_listener_get_doit 2026/03/07 10:57 2026/03/07 10:57 2026/03/07 11:06 31e9c887f7dc24e04b3ca70d0d54fc34141844b0

			
		
Discussions (5)
Title Replies (including bot) Last reply
[syzbot] Monthly nfs report (Jul 2025) 0 (1) 2025/07/04 12:38
[syzbot] Monthly nfs report (Jun 2025) 0 (1) 2025/06/03 09:38
[syzbot] [nfs?] INFO: task hung in nfsd_nl_listener_get_doit 5 (7) 2024/06/17 17:21
Re: [syzbot] [nfs?] INFO: task hung in nfsd_nl_listener_get_doit 1 (1) 2024/06/17 15:45
Re: [syzbot] [nfs?] INFO: task hung in nfsd_nl_listener_get_doit 1 (1) 2024/06/17 15:00

Sample crash report:
INFO: task syz.4.4402:28810 blocked for more than 142 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.4402      state:D stack:27176 pid:28810 tgid:28809 ppid:22203  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5504 [inline]
 __schedule+0x125c/0x6730 kernel/sched/core.c:7228
 __schedule_loop kernel/sched/core.c:7307 [inline]
 schedule+0xdd/0x390 kernel/sched/core.c:7322
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7379
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xccc/0x1bd0 kernel/locking/mutex.c:821
 nfsd_nl_listener_get_doit+0x13f/0x7c0 fs/nfsd/nfsctl.c:2114
 genl_family_rcv_msg_doit+0x214/0x300 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x560/0x800 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x159/0x420 net/netlink/af_netlink.c:2556
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x585/0x850 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x8b0/0xda0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:775 [inline]
 __sock_sendmsg net/socket.c:790 [inline]
 ____sys_sendmsg+0xa4d/0xbe0 net/socket.c:2684
 ___sys_sendmsg+0x190/0x1e0 net/socket.c:2738
 __sys_sendmsg+0x160/0x210 net/socket.c:2770
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x840 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb15e99ce59
RSP: 002b:00007fb15f92c028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fb15ec15fa0 RCX: 00007fb15e99ce59
RDX: 0000000000000050 RSI: 0000200000000140 RDI: 0000000000000004
RBP: 00007fb15ea32e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb15ec16038 R14: 00007fb15ec15fa0 R15: 00007fff575ba3c8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x1d7/0x230 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x370/0x450 kernel/kthread.c:436
 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (1672):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/06/20 09:27 upstream a975094bf98c 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 16:51 upstream 9ecfb2f7287a 023e42b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/17 18:49 upstream 5b33fc6492a7 b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/15 19:05 upstream 95e56f0f293e 4da592ca .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/13 10:35 upstream 1dadb7e7eb5a 4f06757f .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/09 08:03 upstream 2d3090a8aeb5 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/09 05:38 upstream 2d3090a8aeb5 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/06/06 18:08 upstream 8e65320d91cd cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nfsd_nl_listener_get_doit
2026/06/02 07:51 upstream 6f3ed7fec72f 1095583b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_listener_get_doit
2026/06/01 01:59 upstream 174914ea5513 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/05/14 14:25 upstream e1914add2799 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2026/05/05 00:31 upstream c7e4e4d5f7dc a898ba9c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in nfsd_nl_listener_get_doit
2026/03/04 22:56 upstream ecc64d2dc9ff e6b6b96b .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in nfsd_nl_listener_get_doit
2024/06/12 23:32 upstream cea2a26553ac 2aa5052f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nfsd_nl_listener_get_doit
2024/06/11 07:12 upstream 83a7eefedc9b 048c640a .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in nfsd_nl_listener_get_doit
2024/06/04 08:01 upstream 2ab795141095 a1feae05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 23:04 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 20:42 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 19:03 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 16:08 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 15:05 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/20 05:11 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 20:14 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 17:08 net 96e7f9122aae 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 12:29 net 5c121ee63568 d7ffd47b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 10:07 net 5c121ee63568 d7ffd47b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/19 00:04 net 7d8297e26b4e a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/18 06:27 net b85966adbf5d b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/18 05:24 net b85966adbf5d b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/17 15:33 net 406e8a651a7b 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/17 12:42 net 406e8a651a7b 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/17 09:19 net 406e8a651a7b 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/17 08:02 net 406e8a651a7b 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/16 21:13 net fbc6a80cb5d3 0e4b3e40 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/16 03:57 net 62821d481975 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/15 13:38 net 47186409c092 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/14 23:33 net 47186409c092 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/14 12:01 net a4004aa0debf 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/14 02:57 net 05f5368cf3e9 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/13 11:43 net e26657fe3b85 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/13 05:45 net e26657fe3b85 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/12 20:30 net 9bf10032894f 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/12 09:47 net 9bf10032894f e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/12 06:34 net 9bf10032894f e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/12 05:30 net 9bf10032894f e93da63e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/11 14:59 net 7360b9609980 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/09 17:45 net 09a5bf856aa7 c36c07f6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/09 01:01 net 5d39580f68e6 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/08 11:48 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/08 08:33 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/08 06:57 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/08 00:15 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/07 22:07 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/07 15:52 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/07 13:17 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/07 08:53 net 9772589b57e4 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/18 19:39 net-next b85966adbf5d a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/18 02:50 net-next b85966adbf5d b62b3ded .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/12 18:49 net-next f6033078a9e6 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/11 08:53 net-next c8459ee2fef5 b754d2d8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/06/07 07:42 net-next 903db046d557 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
2026/02/13 19:20 linux-next 635c467cc14e 1e62d198 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in nfsd_nl_listener_get_doit
2026/01/23 05:58 linux-next a0c666c25aee 82c9c083 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in nfsd_nl_listener_get_doit
* Struck through repros no longer work on HEAD.