syzbot


INFO: task hung in rtnetlink_rcv_msg

Status: upstream: reported on 2023/03/01 21:15
Reported-by: syzbot+9677f1ac838552265385@syzkaller.appspotmail.com
First crash: 471d, last: 471d
Similar bugs (9)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in rtnetlink_rcv_msg 1 336d 336d 0/3 auto-obsoleted due to no activity on 2023/10/22 21:13
linux-4.19 INFO: task hung in rtnetlink_rcv_msg (2) 14 879d 1058d 0/1 auto-closed as invalid on 2022/05/18 11:30
linux-4.19 INFO: task hung in rtnetlink_rcv_msg (3) 8 492d 725d 0/1 upstream: reported on 2022/06/20 23:55
linux-4.19 INFO: task hung in rtnetlink_rcv_msg 11 1310d 1632d 0/1 auto-closed as invalid on 2021/03/12 19:03
upstream INFO: task hung in rtnetlink_rcv_msg net C inconclusive inconclusive 1759 16m 1940d 0/27 upstream: reported C repro on 2019/02/22 17:00
linux-5.15 INFO: task hung in rtnetlink_rcv_msg (2) 41 1h11m 138d 0/3 upstream: reported on 2024/01/29 02:32
linux-6.1 INFO: task hung in rtnetlink_rcv_msg (2) 57 16h39m 140d 0/3 upstream: reported on 2024/01/27 00:38
linux-6.1 INFO: task hung in rtnetlink_rcv_msg 1 261d 261d 0/3 auto-obsoleted due to no activity on 2024/01/09 18:18
upstream INFO: task hung in cangw_pernet_exit (3) can syz unreliable 290 900d 1006d 0/27 closed as invalid on 2022/02/08 10:22

Sample crash report:
INFO: task syz-executor.0:13164 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0  D29184 13164   8009 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f716cfba0f9
RSP: 002b:00007f716b4ea168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f716d0da120 RCX: 00007f716cfba0f9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007f716d015ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff03f1290f R14: 00007f716b4ea300 R15: 0000000000022000
INFO: task syz-executor.4:13186 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29568 13186   8024 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd487c6712c
RSP: 002b:00007fd486226000 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fd4862260f0 RCX: 00007fd487c6712c
RDX: 0000000000000020 RSI: 00007fd486226140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fd486226054 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fd4862260a8
R13: 00007fd486226140 R14: 0000000000000003 R15: 0000000000000000
INFO: task syz-executor.4:13189 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29184 13189   8024 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd487cb50f9
RSP: 002b:00007fd486206168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd487dd5050 RCX: 00007fd487cb50f9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007fd487d10ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce27e80af R14: 00007fd486206300 R15: 0000000000022000
INFO: task syz-executor.4:13191 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28592 13191   8024 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 team_nl_cmd_options_set+0x79/0xb40 drivers/net/team/team.c:2503
 genl_family_rcv_msg+0x572/0xb20 net/netlink/genetlink.c:600
 genl_rcv_msg+0xaf/0x140 net/netlink/genetlink.c:625
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd487cb50f9
RSP: 002b:00007fd4861e5168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd487dd5120 RCX: 00007fd487cb50f9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000006
RBP: 00007fd487d10ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce27e80af R14: 00007fd4861e5300 R15: 0000000000022000
INFO: task syz-executor.4:13194 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D29184 13194   8024 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fd487cb50f9
RSP: 002b:00007fd4861c4168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fd487dd51f0 RCX: 00007fd487cb50f9
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007fd487d10ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffce27e80af R14: 00007fd4861c4300 R15: 0000000000022000
INFO: task syz-executor.3:13190 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D29568 13190   8039 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
8021q: adding VLAN 0 to HW filter on device batadv3
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbfaa59412c
RSP: 002b:00007fbfa8b53000 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fbfa8b530f0 RCX: 00007fbfaa59412c
RDX: 0000000000000020 RSI: 00007fbfa8b53140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007fbfa8b53054 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fbfa8b530a8
R13: 00007fbfa8b53140 R14: 0000000000000003 R15: 0000000000000000
INFO: task syz-executor.3:13192 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D29184 13192   8039 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbfaa5e20f9
RSP: 002b:00007fbfa8b33168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbfaa702050 RCX: 00007fbfaa5e20f9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00007fbfaa63dae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdd84392ef R14: 00007fbfa8b33300 R15: 0000000000022000
INFO: task syz-executor.3:13193 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D29568 13193   8039 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 genl_lock net/netlink/genetlink.c:33 [inline]
 genl_rcv_msg+0x112/0x140 net/netlink/genetlink.c:623
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 genl_rcv+0x24/0x40 net/netlink/genetlink.c:636
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 SYSC_sendto net/socket.c:1763 [inline]
 SyS_sendto+0x1c7/0x2c0 net/socket.c:1731
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbfaa59412c
RSP: 002b:00007fbfa8b11000 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fbfa8b110f0 RCX: 00007fbfaa59412c
RDX: 0000000000000020 RSI: 00007fbfa8b11140 RDI: 0000000000000007
RBP: 0000000000000000 R08: 00007fbfa8b11054 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fbfa8b110a8
R13: 00007fbfa8b11140 R14: 0000000000000007 R15: 0000000000000000
INFO: task syz-executor.3:13195 blocked for more than 140 seconds.
      Not tainted 4.14.307-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D29184 13195   8039 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2811 [inline]
 __schedule+0x88b/0x1de0 kernel/sched/core.c:3386
 schedule+0x8d/0x1b0 kernel/sched/core.c:3430
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3488
 __mutex_lock_common kernel/locking/mutex.c:833 [inline]
 __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2461
 netlink_unicast_kernel net/netlink/af_netlink.c:1302 [inline]
 netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1328
 netlink_sendmsg+0x651/0xbc0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xb5/0x100 net/socket.c:656
 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7fbfaa5e20f9
RSP: 002b:00007fbfa8af1168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fbfaa7021f0 RCX: 00007fbfaa5e20f9
team3: Port device batadv3 added
RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000004
RBP: 00007fbfaa63dae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffdd84392ef R14: 00007fbfa8af1300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1532:
 #0:  (tasklist_lock){.+.+}, at: [<ffffffff8702e2fc>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
3 locks held by kworker/1:2/4316:
 #0:  ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff81366110>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  ((&(&ifa->dad_work)->work)){+.+.}, at: [<ffffffff81366146>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
 #2:  (rtnl_mutex){+.+.}, at: [<ffffffff86379a29>] addrconf_dad_work+0x89/0xef0 net/ipv6/addrconf.c:3925
1 lock held by syz-executor.1/8023:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff83d56f74>] tun_detach drivers/net/tun.c:593 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff83d56f74>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2732
3 locks held by kworker/0:3/8803:
 #0:  ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff81366110>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  ((addr_chk_work).work){+.+.}, at: [<ffffffff81366146>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
 #2:  (rtnl_mutex){+.+.}, at: [<ffffffff8637751a>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4421
3 locks held by kworker/1:4/9110:
 #0:  ("events"){+.+.}, at: [<ffffffff81366110>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  (deferred_process_work){+.+.}, at: [<ffffffff81366146>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
 #2:  (rtnl_mutex){+.+.}, at: [<ffffffff86fca9ba>] switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
3 locks held by kworker/1:5/9252:
 #0:  ("events"){+.+.}, at: [<ffffffff81366110>] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088
 #1:  ((linkwatch_work).work){+.+.}, at: [<ffffffff81366146>] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092
 #2:  (rtnl_mutex){+.+.}, at: [<ffffffff85c9790a>] linkwatch_event+0xa/0x50 net/core/link_watch.c:236
1 lock held by syz-executor.4/13186:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
1 lock held by syz-executor.4/13189:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
3 locks held by syz-executor.4/13191:
 #0:  (cb_lock){++++}, at: [<ffffffff85e3f495>] genl_rcv+0x15/0x40 net/netlink/genetlink.c:635
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_lock net/netlink/genetlink.c:33 [inline]
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_rcv_msg+0x112/0x140 net/netlink/genetlink.c:623
 #2:  (rtnl_mutex){+.+.}, at: [<ffffffff83d473c9>] team_nl_cmd_options_set+0x79/0xb40 drivers/net/team/team.c:2503
1 lock held by syz-executor.4/13194:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
1 lock held by syz-executor.3/13190:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
1 lock held by syz-executor.3/13192:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317
2 locks held by syz-executor.3/13193:
 #0:  (cb_lock){++++}, at: [<ffffffff85e3f495>] genl_rcv+0x15/0x40 net/netlink/genetlink.c:635
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_lock net/netlink/genetlink.c:33 [inline]
 #1:  (genl_mutex){+.+.}, at: [<ffffffff85e400f2>] genl_rcv_msg+0x112/0x140 net/netlink/genetlink.c:623
1 lock held by syz-executor.3/13195:
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0:  (rtnl_mutex){+.+.}, at: [<ffffffff85c8dcdd>] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317

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

NMI backtrace for cpu 0
CPU: 0 PID: 1532 Comm: khungtaskd Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
 watchdog+0x5b9/0xb40 kernel/hung_task.c:274
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2713 Comm: kworker/u4:3 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Workqueue: bat_events batadv_tt_purge
task: ffff8880af3fe680 task.stack: ffff8880aec00000
RIP: 0010:native_apic_mem_write+0x8/0x10 arch/x86/include/asm/apic.h:100
RSP: 0018:ffff8880ba507c90 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffffffff88ccd000 RCX: 0000000000000020
RDX: 1ffffffff1199a1d RSI: 0000000000025047 RDI: 0000000000000380
RBP: ffff8880ba5282c0 R08: ffff88823fff7058 R09: ffff88823fff704f
R10: ffff88823fff7057 R11: 000000673895b1b4 R12: 0000000000025047
R13: 0000000000000003 R14: 00000065e5607200 R15: ffff8880ba52ede8
FS:  0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe93618a980 CR3: 00000000ac3d8000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 apic_write arch/x86/include/asm/apic.h:385 [inline]
 lapic_next_event+0x53/0x80 arch/x86/kernel/apic/apic.c:468
 clockevents_program_event+0x1f1/0x2d0 kernel/time/clockevents.c:339
 tick_program_event+0x78/0xd0 kernel/time/tick-oneshot.c:47
 hrtimer_interrupt+0x205/0x470 kernel/time/hrtimer.c:1334
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline]
 smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104
 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:796
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:779 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa3/0xe0 kernel/locking/spinlock.c:192
RSP: 0018:ffff8880ba507e48 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff10
RAX: 1ffffffff11e13d9 RBX: 0000000000000282 RCX: 1ffff11015e7fdea
RDX: dffffc0000000000 RSI: ffff8880af3fef30 RDI: 0000000000000282
RBP: ffff8880ba52ec80 R08: ffff88823fff7058 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880a3070dc0
R13: 0000000000000000 R14: ffff8880a3070f08 R15: 1ffffffff11e13db
 hrtimer_start include/linux/hrtimer.h:377 [inline]
 bcm_tx_start_timer+0xed/0x190 net/can/bcm.c:398
 bcm_tx_timeout_tsklet+0xfc/0x320 net/can/bcm.c:430
 tasklet_action+0x195/0x340 kernel/softirq.c:513
 __do_softirq+0x24d/0x9ff kernel/softirq.c:288
 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1019
 </IRQ>
 do_softirq.part.0+0x154/0x1b0 kernel/softirq.c:332
 do_softirq kernel/softirq.c:324 [inline]
 __local_bh_enable_ip+0x12b/0x170 kernel/softirq.c:185
 spin_unlock_bh include/linux/spinlock.h:362 [inline]
 batadv_tt_global_purge net/batman-adv/translation-table.c:2524 [inline]
 batadv_tt_purge+0x319/0x930 net/batman-adv/translation-table.c:3795
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406
Code: 83 3d fc 05 0c 0a 01 7f 02 5d c3 89 ef 5d e9 c9 b7 df 05 48 c7 c7 00 a4 2e 8b e8 e4 7b 5c 00 eb df 66 90 89 ff 89 b7 00 c0 5f ff <c3> 0f 1f 80 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 53 89 fb 

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/03/01 21:15 linux-4.14.y 7878a41b6cc1 f8902b57 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-4-14 INFO: task hung in rtnetlink_rcv_msg
* Struck through repros no longer work on HEAD.