INFO: task hung in genl_rcv_msg (4)

Status: fixed on 2026/08/17 15:57
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+85d0bec020d805014a3a@syzkaller.appspotmail.com
Fix commit: 22f8aa35964e tipc: fix infinite loop in __tipc_nl_compat_dumpit
First crash: 823d, last: 3d01h
Cause bisection: introduced by (bisect log) :
commit d15121be7485655129101f3960ae6add40204463
Author: Paolo Abeni <pabeni@redhat.com>
Date: Mon May 8 06:17:44 2023 +0000

  Revert "softirq: Let ksoftirqd do its job"

Crash: no output from test machine (log)
Repro: C syz .config
  
▶ ▼ ✨ AI Jobs (7)
ID Workflow Result Correct Bug Created Started Finished Revision
8fea44bd assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/08/05 00:04 2026/08/05 00:04 2026/08/05 00:04 d4abbeac
ced71d47 assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/07/05 05:56 2026/07/05 05:56 2026/07/05 06:22 93f57954
036252c2 assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/06/18 05:31 2026/06/18 05:31 2026/06/18 05:54 b62b3ded
9ed5275d assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/06/10 01:26 2026/06/10 01:26 2026/06/10 01:54 c36c07f6
988d31d7 assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/06/04 03:46 2026/06/04 03:46 2026/06/04 04:01 62fe1528
0ecd9bde assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/06/01 18:46 2026/06/01 18:46 2026/06/01 19:12 386cc6da
e02cf7b8 assessment-security 💥 INFO: task hung in genl_rcv_msg (4) 2026/05/17 17:19 2026/05/17 17:19 2026/05/17 17:44 de5aae85
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH net] tipc: fix infinite loop in __tipc_nl_compat_dumpit 4 (4) 2026/07/15 02:17
[syzbot] [net?] INFO: task hung in genl_rcv_msg (4) 0 (3) 2024/10/27 12:00
▶ ▼ Similar bugs (14)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in genl_rcv_msg (2) net 1 2 1138d 1171d 0/29 auto-obsoleted due to no activity on 2023/10/06 17:32
linux-5.15 INFO: task hung in genl_rcv_msg (3) 1 1 136d 136d 0/3 auto-obsoleted due to no activity on 2026/07/14 07:56
upstream INFO: task hung in genl_rcv_msg (3) net 1 syz, C done 13 869d 1011d 0/29 closed as invalid on 2024/04/16 10:15
linux-6.6 INFO: task hung in genl_rcv_msg 1 1 264d 264d 0/2 auto-obsoleted due to no activity on 2026/03/07 22:43
linux-6.1 INFO: task hung in genl_rcv_msg (2) 1 3 580d 695d 0/3 auto-obsoleted due to no activity on 2025/04/25 22:22
linux-5.15 INFO: task hung in genl_rcv_msg (2) 1 1 568d 568d 0/3 auto-obsoleted due to no activity on 2025/05/07 21:13
linux-4.19 INFO: task hung in genl_rcv_msg 1 syz error 17 1289d 2666d 0/1 upstream: reported syz repro on 2019/05/02 15:34
android-6-12 INFO: task hung in genl_rcv_msg 1 1 9d12h 9d12h 0/1 premoderation: reported on 2026/08/10 07:48
upstream INFO: task hung in genl_rcv_msg 1 syz done error 648 1317d 2865d 0/29 auto-obsoleted due to no activity on 2023/05/10 03:30
linux-4.14 INFO: task hung in genl_rcv_msg (2) 1 6 2100d 2289d 0/1 auto-closed as invalid on 2021/03/17 23:44
linux-6.1 INFO: task hung in genl_rcv_msg 1 1 976d 976d 0/3 auto-obsoleted due to no activity on 2024/03/26 09:02
linux-4.14 INFO: task hung in genl_rcv_msg 1 syz done 2 2406d 2406d 1/1 fixed on 2020/02/16 23:53
linux-6.1 INFO: task hung in genl_rcv_msg (3) 1 2 307d 326d 0/3 auto-obsoleted due to no activity on 2026/01/24 07:13
linux-5.15 INFO: task hung in genl_rcv_msg 1 1 1114d 1114d 0/3 auto-obsoleted due to no activity on 2023/11/09 20:26
▶ ▼ Last patch testing requests (7)
Created Duration User Patch Repo Result
2025/06/15 21:46 19m retest repro upstream report log
2025/04/15 07:47 18m retest repro upstream report log
2025/03/11 02:14 24m retest repro upstream report log
2025/02/25 00:52 22m retest repro upstream report log
2025/02/25 00:52 22m retest repro net report log
2025/02/24 21:15 9m retest repro linux-next error
2024/11/10 21:22 21m retest repro upstream report log

Sample crash report:
INFO: task syz-executor345:5999 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor345 state:D stack:26992 pid:5999  tgid:5978  ppid:5856   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2583
 ___sys_sendmsg net/socket.c:2637 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2669
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9ebe1479
RSP: 002b:00007f5f9eb38238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5f9ec6b398 RCX: 00007f5f9ebe1479
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 00007f5f9ec6b390 R08: 00007fff256bb317 R09: 00007f5f9eb386c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5f9ec38074
R13: 000000000000006e R14: 00007fff256bb230 R15: 00007fff256bb318
 </TASK>
INFO: task syz-executor345:5996 blocked for more than 143 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor345 state:D stack:24784 pid:5996  tgid:5985  ppid:5861   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9ebe2dcc
RSP: 002b:00007f5f9eb58160 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5f9eb58224 RCX: 00007f5f9ebe2dcc
RDX: 0000000000000020 RSI: 00007f5f9eb58210 RDI: 0000000000000007
RBP: 0000000000000000 R08: 00007f5f9eb581b4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f5f9eb58210
R13: 000000000000006e R14: 00007fff256bb230 R15: 00007fff256bb318
 </TASK>
INFO: task syz-executor345:6006 blocked for more than 144 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor345 state:D stack:25760 pid:6006  tgid:6001  ppid:5857   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9ebe2dcc
RSP: 002b:00007f5f9eb58160 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5f9eb58224 RCX: 00007f5f9ebe2dcc
RDX: 0000000000000020 RSI: 00007f5f9eb58210 RDI: 0000000000000007
RBP: 0000000000000000 R08: 00007f5f9eb581b4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f5f9eb58210
R13: 000000000000006e R14: 00007fff256bb230 R15: 00007fff256bb318
 </TASK>
INFO: task syz-executor345:6008 blocked for more than 144 seconds.
      Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor345 state:D stack:24688 pid:6008  tgid:6003  ppid:5859   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6756
 __schedule_loop kernel/sched/core.c:6833 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6848
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 __sys_sendto+0x363/0x4c0 net/socket.c:2197
 __do_sys_sendto net/socket.c:2204 [inline]
 __se_sys_sendto net/socket.c:2200 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2200
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9ebe2dcc
RSP: 002b:00007f5f9eb58160 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5f9eb58224 RCX: 00007f5f9ebe2dcc
RDX: 0000000000000020 RSI: 00007f5f9eb58210 RDI: 0000000000000007
RBP: 0000000000000000 R08: 00007f5f9eb581b4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007f5f9eb58210
R13: 000000000000006e R14: 00007fff256bb230 R15: 00007fff256bb318
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
2 locks held by getty/5590:
 #0: ffff88814ea880a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000330b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz-executor345/5999:
 #0: ffffffff8fd15ab0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
2 locks held by syz-executor345/5997:
2 locks held by syz-executor345/5996:
 #0: ffffffff8fd15ab0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
2 locks held by syz-executor345/6006:
 #0: ffffffff8fd15ab0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209
2 locks held by syz-executor345/6008:
 #0: ffffffff8fd15ab0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline]
 #1: ffffffff8fd15968 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x121/0xec0 net/netlink/genetlink.c:1209

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 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:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
 watchdog+0xff6/0x1040 kernel/hung_task.c:397
 kthread+0x2f0/0x390 kernel/kthread.c:389
 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 UID: 0 PID: 5997 Comm: syz-executor345 Not tainted 6.13.0-rc7-syzkaller-00189-g595523945be0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__nla_validate_parse+0x10/0x3090 lib/nlattr.c:609
Code: 00 00 00 00 00 0f 1f 44 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 <53> 48 83 e4 e0 48 81 ec 00 02 00 00 4d 89 cd 44 89 44 24 78 48 89
RSP: 0018:ffffc9000484e860 EFLAGS: 00000293
RAX: ffffffff84f99bc4 RBX: ffff88807c7d8018 RCX: ffffffff8d299a60
RDX: 000000000000000c RSI: 0000000000000008 RDI: ffff88807c7d8018
RBP: ffffc9000484e880 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc9000484ea00 R11: fffff52000909d4d R12: 0000000000000008
R13: ffffc9000484ea00 R14: 0000000000000000 R15: ffffffff8d299a60
FS:  00007f5f9eb386c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe4fefe198 CR3: 000000007c938000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 __nla_parse+0x40/0x60 lib/nlattr.c:732
 nla_parse_nested_deprecated include/net/netlink.h:1342 [inline]
 tipc_nl_publ_dump+0x290/0xde0 net/tipc/socket.c:3791
 __tipc_nl_compat_dumpit+0x4bf/0xbf0 net/tipc/netlink_compat.c:224
 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1032 [inline]
 tipc_nl_compat_sk_dump+0x7b3/0x9a0 net/tipc/netlink_compat.c:1084
 __tipc_nl_compat_dumpit+0x611/0xbf0 net/tipc/netlink_compat.c:235
 tipc_nl_compat_dumpit+0x4fc/0x740 net/tipc/netlink_compat.c:318
 tipc_nl_compat_recv+0xdaa/0x14c0 net/tipc/netlink_compat.c:1321
 genl_family_rcv_msg_doit net/netlink/genetlink.c:1115 [inline]
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0xb14/0xec0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2542
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x7f6/0x990 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0x8e4/0xcb0 net/netlink/af_netlink.c:1891
 sock_sendmsg_nosec net/socket.c:711 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:726
 ____sys_sendmsg+0x52a/0x7e0 net/socket.c:2583
 ___sys_sendmsg net/socket.c:2637 [inline]
 __sys_sendmsg+0x269/0x350 net/socket.c:2669
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5f9ebe1479
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 01 1a 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5f9eb38238 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f5f9ec6b398 RCX: 00007f5f9ebe1479
RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000006
RBP: 00007f5f9ec6b390 R08: 00007fff256bb317 R09: 00007f5f9eb386c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5f9ec38074
R13: 000000000000006e R14: 00007fff256bb230 R15: 00007fff256bb318
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.908 msecs

Crashes (880):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/01/18 10:18 upstream 595523945be0 f2cb035c .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in genl_rcv_msg
2024/10/25 02:50 upstream c2ee9f594da8 9fc8fe02 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in genl_rcv_msg
2026/08/16 18:55 net 24ef02f934ee 746171ee .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/01/09 09:55 net 56d0aea041f2 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2025/09/30 07:17 net b9bd25f47eb7 86341da6 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2024/12/31 10:29 net ad5c318086e2 d3ccff63 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/06/17 03:26 linux-next 4fa3f5fabb30 0e4b3e40 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in genl_rcv_msg
2025/09/30 21:57 linux-next 3b9b1f8df454 65a0eece .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in genl_rcv_msg
2025/09/20 02:36 linux-next 846bd2225ec3 67c37560 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in genl_rcv_msg
2024/12/24 07:34 linux-next 8155b4ef3466 444551c4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in genl_rcv_msg
2026/01/11 11:46 upstream 97313d6113ab d6526ea3 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in genl_rcv_msg
2025/07/25 22:17 upstream 2942242dde89 fb8f743d .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in genl_rcv_msg
2025/05/09 02:40 upstream 2c89c1b655c0 bb813bcc .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in genl_rcv_msg
2025/03/15 02:57 upstream 83158b21ae9a e2826670 .config console log report syz / log [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root INFO: task hung in genl_rcv_msg
2026/07/30 00:04 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in genl_rcv_msg
2026/07/09 14:05 upstream 0e35b9b6ec0f b9f1ceaa .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in genl_rcv_msg
2026/06/29 15:07 upstream dc59e4fea9d8 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in genl_rcv_msg
2026/01/20 19:05 upstream 24d479d26b25 572effc1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in genl_rcv_msg
2025/12/17 16:53 upstream ea1013c15392 d1b870e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in genl_rcv_msg
2025/01/26 14:43 upstream aa22f4da2a46 9fbd772e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in genl_rcv_msg
2024/09/29 19:25 upstream e7ed34365879 ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in genl_rcv_msg
2024/09/28 21:55 upstream 3efc57369a0c ba29ff75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in genl_rcv_msg
2024/08/19 02:46 upstream c3f2d783a459 dbc93b08 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in genl_rcv_msg
2025/09/15 06:55 upstream 79e8447ec662 e2beed91 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in genl_rcv_msg
2026/08/14 23:55 net 24ef02f934ee 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/13 09:35 net 2bb155e92167 67796a05 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/11 05:26 net cef51860becd 039457bd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/08 04:20 net 3dbb44d88b1e e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/06 18:27 net 7e2d693af0d4 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/06 15:04 net 7e2d693af0d4 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/06 11:19 net 9113e98eb7e3 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/06 03:38 net 9113e98eb7e3 cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/04 01:07 net af39eb111ce6 a68cb31b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/03 15:26 net af39eb111ce6 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/02 17:48 net af39eb111ce6 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/01 22:48 net af39eb111ce6 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/01 10:16 net af39eb111ce6 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/31 15:19 net 2195424c3da2 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/31 14:17 net 2195424c3da2 7664cf44 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/31 09:58 net 451c9075d6c5 aaffb173 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/30 11:53 net 54ad7ea45d63 2377cd3d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/27 13:54 net 53658c6f3682 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/26 14:16 net 53658c6f3682 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/25 17:55 net 53658c6f3682 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/25 16:36 net 53658c6f3682 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/25 03:57 net 78f75d632f74 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/24 22:26 net 78f75d632f74 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/23 22:24 net f43ee0c0730d 71a13572 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/23 05:12 net fec15bb3dab0 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/23 02:48 net fec15bb3dab0 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/23 01:17 net fec15bb3dab0 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/23 00:05 net fec15bb3dab0 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/22 19:21 net fec15bb3dab0 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/19 23:04 net 56d96fededd6 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/19 07:46 net 56d96fededd6 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/18 07:46 net 56d96fededd6 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/17 03:04 net 3f1f75536668 8f30cfd7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/16 17:34 net 3f1f75536668 8f30cfd7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/16 14:54 net 3f1f75536668 8f30cfd7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/16 12:41 net 3f1f75536668 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/16 09:57 net 3f1f75536668 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/16 06:36 net-next e6a5d573d24c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/15 22:10 net-next e6a5d573d24c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/15 17:10 net-next e6a5d573d24c 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/12 10:09 net-next 31397cf18192 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/11 08:56 net-next f1529936c0b6 039457bd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/10 04:43 net-next 001b5d347d8b 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/09 15:15 net-next 001b5d347d8b 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/09 09:24 net-next 001b5d347d8b 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/08 09:47 net-next 3a30302b9391 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/07 17:42 net-next 4fa4977a0d90 e4ef95d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/07 09:03 net-next 4fa4977a0d90 c38879ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/01 20:28 net-next 69963a0678a3 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/01 12:39 net-next 69963a0678a3 e611ffe1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2024/09/20 19:46 net-next 9410645520e9 6f888b75 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in genl_rcv_msg
2026/08/06 08:11 linux-next cc2b5f627e8c cd5b1963 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in genl_rcv_msg
2026/07/16 22:47 linux-next cc2b5f627e8c 8f30cfd7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: task hung in genl_rcv_msg
2026/06/11 18:54 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 596d152bc5e3 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in genl_rcv_msg
2024/10/11 01:10 git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git fixes cfb10de18538 cd942402 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu2-riscv64 INFO: task hung in genl_rcv_msg
* Struck through repros no longer work on HEAD.