INFO: task hung in genl_rcv_msg

Status: auto-obsoleted due to no activity on 2026/11/08 07:55
Reported-by: syzbot+6b303d937fd2be982c3d@syzkaller.appspotmail.com
First crash: 91d, last: 91d
▶ ▼ Similar bugs (15)
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 1220d 1253d 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 218d 218d 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 951d 1093d 0/29 closed as invalid on 2024/04/16 10:15
linux-6.6 INFO: task hung in genl_rcv_msg 1 1 346d 346d 0/2 auto-obsoleted due to no activity on 2026/03/07 22:43
upstream INFO: task hung in genl_rcv_msg (4) net 1 syz, C done 880 85d 767d 29/29 fixed on 2026/08/17 15:57
linux-6.1 INFO: task hung in genl_rcv_msg (2) 1 3 662d 777d 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 650d 650d 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 1371d 2748d 0/1 upstream: reported syz repro on 2019/05/02 15:34
upstream INFO: task hung in genl_rcv_msg (5) prio:low net 1 syz, C error 305 14h34m 79d 0/29 upstream: reported C repro on 2026/08/22 00:21
upstream INFO: task hung in genl_rcv_msg 1 syz done error 648 1399d 2947d 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 2182d 2371d 0/1 auto-closed as invalid on 2021/03/17 23:44
linux-6.1 INFO: task hung in genl_rcv_msg 1 1 1058d 1058d 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 2488d 2488d 1/1 fixed on 2020/02/16 23:53
linux-6.1 INFO: task hung in genl_rcv_msg (3) 1 2 389d 408d 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 1196d 1196d 0/3 auto-obsoleted due to no activity on 2023/11/09 20:26

Sample crash report:
INFO: task dhcpcd:148 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:0     pid:148   tgid:148   ppid:1      flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x9a1/0xa00 net/socket.c:2609
 ___sys_sendmsg+0x2a6/0x370 net/socket.c:2663
 __sys_sendmsg net/socket.c:2692 [inline]
 __do_sys_sendmsg net/socket.c:2701 [inline]
 __se_sys_sendmsg net/socket.c:2699 [inline]
 __x64_sys_sendmsg+0x206/0x2e0 net/socket.c:2699
 x64_sys_call+0x2a4c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff48c8fa407
RSP: 002b:00007fff412f6c10 EFLAGS: 00000202 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007ff48c870740 RCX: 00007ff48c8fa407
RDX: 0000000000000000 RSI: 00007fff412f6c90 RDI: 000000000000000e
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000056325edcae10
R13: 000000000000000e R14: 00007fff4130b150 R15: 0000563288d2b350
 </TASK>
INFO: task syz.2.687:2639 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.687       state:D stack:0     pid:2639  tgid:2633  ppid:296    flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f846715e90e
RSP: 002b:00007f8468045e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f84680476c0 RCX: 00007f846715e90e
RDX: 000000000000001c RSI: 00007f8468046000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 00007f8468045f04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 00007f8468045f58 R14: 00007f8468046000 R15: 0000000000000000
 </TASK>
INFO: task syz.2.687:2640 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.687       state:D stack:0     pid:2640  tgid:2633  ppid:296    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f846715e90e
RSP: 002b:00007f8468023e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f84680256c0 RCX: 00007f846715e90e
RDX: 0000000000000024 RSI: 00007f8468024000 RDI: 0000000000000009
RBP: 0000000000000000 R08: 00007f8468023f04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007f8468023f58 R14: 00007f8468024000 R15: 0000000000000000
 </TASK>
INFO: task syz.3.697:2665 blocked for more than 123 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.697       state:D stack:0     pid:2665  tgid:2664  ppid:295    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fcea0f5e90e
RSP: 002b:00007fcea1f43e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fcea1f456c0 RCX: 00007fcea0f5e90e
RDX: 0000000000000020 RSI: 00007fcea1f44000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fcea1f43f04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007fcea1f43f58 R14: 00007fcea1f44000 R15: 0000000000000000
 </TASK>
INFO: task syz.4.704:2683 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.704       state:D stack:0     pid:2683  tgid:2682  ppid:1567   flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f0d3f55e90e
RSP: 002b:00007f0d40521e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f0d405236c0 RCX: 00007f0d3f55e90e
RDX: 0000000000000020 RSI: 00007f0d40522000 RDI: 0000000000000005
RBP: 0000000000000000 R08: 00007f0d40521f04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005
R13: 00007f0d40521f58 R14: 00007f0d40522000 R15: 0000000000000000
 </TASK>
INFO: task syz.0.710:2723 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.710       state:D stack:0     pid:2723  tgid:2722  ppid:294    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fa7ae95e90e
RSP: 002b:00007fa7af8d6e88 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fa7af8d86c0 RCX: 00007fa7ae95e90e
RDX: 0000000000000020 RSI: 00007fa7af8d7000 RDI: 0000000000000009
RBP: 0000000000000000 R08: 00007fa7af8d6f04 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000009
R13: 00007fa7af8d6f58 R14: 00007fa7af8d7000 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:2727 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:2727  tgid:2727  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6060 [inline]
 __schedule+0x1496/0x20b0 kernel/sched/core.c:7880
 __schedule_loop kernel/sched/core.c:7957 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7972
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8029
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x902/0x1b90 kernel/locking/mutex.c:806
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 genl_lock net/netlink/genetlink.c:35 [inline]
 genl_op_lock net/netlink/genetlink.c:60 [inline]
 genl_rcv_msg+0x10a/0x7b0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x68a/0x700 net/socket.c:2216
 __do_sys_sendto net/socket.c:2228 [inline]
 __se_sys_sendto net/socket.c:2224 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2224
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f4d2fb59257
RSP: 002b:00007ffc51090830 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055555e885500 RCX: 00007f4d2fb59257
RDX: 0000000000000024 RSI: 00007f4d30954670 RDI: 0000000000000005
RBP: 0000000000000001 R08: 00007ffc51090894 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000005
R13: 00007ffc510908e8 R14: 00007f4d30954670 R15: 0000000000000000
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 c4896d72d1fb51cdc6291d08376a37fd8080d7bb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 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: 2634 Comm: syz.2.687 Not tainted syzkaller #0 c4896d72d1fb51cdc6291d08376a37fd8080d7bb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:net_generic include/net/netns/generic.h:47 [inline]
RIP: 0010:tipc_sk_lookup+0xe8/0x650 net/tipc/socket.c:2996
Code: ae 85 5d fc 49 c1 e6 03 4c 03 33 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 4c 89 f7 e8 88 85 5d fc <49> 8b 1e e8 e0 8b ed fb e8 6b 8b ed fb 48 8d bb c8 10 00 00 48 89
RSP: 0018:ffffc90000e1e900 EFLAGS: 00000246
RAX: 1ffff1102077f6a5 RBX: ffff88812f65e460 RCX: dffffc0000000000
RDX: ffffc90002675000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000e1e9f0 R08: ffff88810d3a0000 R09: 0000000000000007
R10: 0000000000000007 R11: 0000000000000002 R12: 0000000000000000
R13: dffffc0000000000 R14: ffff888103bfb528 R15: dffffc0000000000
FS:  00007f84680686c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562bc545eaf8 CR3: 000000011c588000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 tipc_nl_publ_dump+0x2c6/0xce0 net/tipc/socket.c:3808
 __tipc_nl_compat_dumpit+0x4b6/0xd40 net/tipc/netlink_compat.c:224
 tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:1032 [inline]
 tipc_nl_compat_sk_dump+0x6c1/0x8b0 net/tipc/netlink_compat.c:1084
 __tipc_nl_compat_dumpit+0x623/0xd40 net/tipc/netlink_compat.c:235
 tipc_nl_compat_dumpit+0x586/0x7e0 net/tipc/netlink_compat.c:318
 tipc_nl_compat_handle net/tipc/netlink_compat.c:-1 [inline]
 tipc_nl_compat_recv+0x859/0xc60 net/tipc/netlink_compat.c:1321
 genl_family_rcv_msg_doit+0x23f/0x360 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60f/0x7b0 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x24a/0x4e0 net/netlink/af_netlink.c:2545
 genl_rcv+0x2c/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
 netlink_unicast+0x8bc/0xa70 net/netlink/af_netlink.c:1339
 netlink_sendmsg+0x7d1/0xad0 net/netlink/af_netlink.c:1889
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 ____sys_sendmsg+0x9a1/0xa00 net/socket.c:2609
 ___sys_sendmsg+0x2a6/0x370 net/socket.c:2663
 __sys_sendmsg net/socket.c:2692 [inline]
 __do_sys_sendmsg net/socket.c:2701 [inline]
 __se_sys_sendmsg net/socket.c:2699 [inline]
 __x64_sys_sendmsg+0x206/0x2e0 net/socket.c:2699
 x64_sys_call+0x2a4c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f846719e0d9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f8468068028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f8467425fa0 RCX: 00007f846719e0d9
RDX: 0000000000000000 RSI: 00002000000016c0 RDI: 0000000000000005
RBP: 00007f8467235024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8467426038 R14: 00007f8467425fa0 R15: 00007fff9033d108
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/10 07:47 android16-6.12 309759bcbe6d 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in genl_rcv_msg
* Struck through repros no longer work on HEAD.