syzbot


INFO: task hung in linkwatch_event (3)

Status: upstream: reported on 2022/11/22 17:04
Subsystems: net
[Documentation on labels]
Reported-by: syzbot+d4b2f8282f84f54e87a1@syzkaller.appspotmail.com
First crash: 736d, last: 2d04h
Discussions (3)
Title Replies (including bot) Last reply
[syzbot] Monthly net report (Feb 2024) 0 (1) 2024/02/27 09:32
[syzbot] Monthly net report (Nov 2023) 5 (6) 2023/11/28 15:05
[syzbot] INFO: task hung in linkwatch_event (3) 0 (1) 2022/11/22 17:04
Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-414 INFO: task hung in linkwatch_event C 7 1645d 1865d 0/1 public: reported C repro on 2019/04/10 16:14
linux-4.14 INFO: task hung in linkwatch_event (2) 1 666d 666d 0/1 auto-obsoleted due to no activity on 2022/11/19 11:58
android-44 INFO: task hung in linkwatch_event 6 2081d 2227d 0/2 auto-closed as invalid on 2019/03/05 13:11
linux-5.15 INFO: task hung in linkwatch_event 26 61d 128d 0/3 upstream: reported on 2024/01/11 11:32
upstream INFO: task hung in linkwatch_event net C 82 1674d 2285d 0/26 closed as dup on 2018/02/14 15:33
linux-4.14 INFO: task hung in linkwatch_event 5 1350d 1477d 0/1 auto-closed as invalid on 2021/01/05 01:42
linux-4.19 INFO: task hung in linkwatch_event (2) C error 217 441d 1529d 0/1 upstream: reported C repro on 2020/03/11 20:12
upstream INFO: task hung in linkwatch_event (2) net C done done 1033 755d 1480d 20/26 fixed on 2022/05/13 11:13
linux-4.19 INFO: task hung in linkwatch_event 3 1683d 1797d 0/1 auto-closed as invalid on 2020/02/07 01:11
linux-4.14 INFO: task hung in linkwatch_event (3) 2 501d 501d 0/1 upstream: reported on 2023/01/03 10:49
android-49 INFO: task hung in linkwatch_event 13 1845d 1862d 0/3 auto-closed as invalid on 2019/10/25 08:50
linux-6.1 INFO: task hung in linkwatch_event 2 287d 403d 0/3 auto-obsoleted due to no activity on 2023/11/14 00:59

Sample crash report:
INFO: task kworker/0:1:9 blocked for more than 143 seconds.
      Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:1     state:D stack:21904 pid:9     tgid:9     ppid:2      flags:0x00004000
Workqueue: events linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 linkwatch_event+0xe/0x60 net/core/link_watch.c:276
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3348
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3429
 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>
INFO: task kworker/u8:6:1057 blocked for more than 143 seconds.
      Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6    state:D stack:20216 pid:1057  tgid:1057  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 wg_destruct+0x25/0x2e0 drivers/net/wireguard/device.c:246
 netdev_run_todo+0xe1a/0x1000 net/core/dev.c:10692
 default_device_exit_batch+0xa14/0xa90 net/core/dev.c:11760
 ops_exit_list net/core/net_namespace.c:178 [inline]
 cleanup_net+0x89d/0xcc0 net/core/net_namespace.c:640
 process_one_work kernel/workqueue.c:3267 [inline]
 process_scheduled_works+0xa10/0x17c0 kernel/workqueue.c:3348
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3429
 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>
INFO: task dhcpcd:4749 blocked for more than 143 seconds.
      Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:18936 pid:4749  tgid:4749  ppid:4748   flags:0x00000002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 netlink_dump+0x5d3/0xe50 net/netlink/af_netlink.c:2336
 netlink_recvmsg+0x6bb/0x11d0 net/netlink/af_netlink.c:1987
 sock_recvmsg_nosec net/socket.c:1046 [inline]
 sock_recvmsg+0x22f/0x280 net/socket.c:1068
 ____sys_recvmsg+0x1db/0x470 net/socket.c:2803
 ___sys_recvmsg net/socket.c:2845 [inline]
 __sys_recvmsg+0x2f0/0x3e0 net/socket.c:2875
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a74c9491e
RSP: 002b:00007ffdaf817b68 EFLAGS: 00000246 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007ffdaf818c90 RCX: 00007f5a74c9491e
RDX: 0000000000000000 RSI: 00007ffdaf818bb0 RDI: 0000000000000018
RBP: 00007ffdaf818c20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000000f5 R11: 0000000000000246 R12: 0000000000000e40
R13: 00007ffdaf818b94 R14: 00007ffdaf818bb0 R15: 00007ffdaf818ba0
 </TASK>
INFO: task syz-executor.3:9854 blocked for more than 144 seconds.
      Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:20984 pid:9854  tgid:9854  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:772
 __nsim_dev_port_del+0x14b/0x1b0 drivers/net/netdevsim/dev.c:1425
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1437 [inline]
 nsim_dev_reload_destroy+0x28a/0x490 drivers/net/netdevsim/dev.c:1658
 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1673
 device_remove drivers/base/dd.c:566 [inline]
 __device_release_driver drivers/base/dd.c:1270 [inline]
 device_release_driver_internal+0x4a9/0x7c0 drivers/base/dd.c:1293
 bus_remove_device+0x34f/0x420 drivers/base/bus.c:574
 device_del+0x57a/0x9e0 drivers/base/core.c:3909
 device_unregister+0x20/0xc0 drivers/base/core.c:3950
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:462 [inline]
 del_device_store+0x363/0x480 drivers/net/netdevsim/bus.c:226
 kernfs_fop_write_iter+0x3a1/0x500 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:2120 [inline]
 new_sync_write fs/read_write.c:497 [inline]
 vfs_write+0xa2d/0xc50 fs/read_write.c:590
 ksys_write+0x1a0/0x2c0 fs/read_write.c:643
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7ef2e7bc2f
RSP: 002b:00007ffdb091f1c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f7ef2e7bc2f
RDX: 0000000000000001 RSI: 00007ffdb091f210 RDI: 0000000000000005
RBP: 00007f7ef2ec9043 R08: 0000000000000000 R09: 00007ffdb091f017
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffdb091f210 R14: 00007f7ef3ad4620 R15: 0000000000000003
 </TASK>
INFO: task syz-executor.1:9990 blocked for more than 144 seconds.
      Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:20984 pid:9990  tgid:9990  ppid:1      flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5409 [inline]
 __schedule+0x1796/0x4a00 kernel/sched/core.c:6746
 __schedule_loop kernel/sched/core.c:6823 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6838
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6895
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a4/0xd70 kernel/locking/mutex.c:752
 rtnl_lock net/core/rtnetlink.c:79 [inline]
 rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
 netlink_rcv_skb+0x1e3/0x430 net/netlink/af_netlink.c:2564
 netlink_unicast_kernel net/netlink/af_netlink.c:1335 [inline]
 netlink_unicast+0x7ea/0x980 net/netlink/af_netlink.c:1361
 netlink_sendmsg+0x8e1/0xcb0 net/netlink/af_netlink.c:1905
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x221/0x270 net/socket.c:745
 __sys_sendto+0x3a4/0x4f0 net/socket.c:2191
 __do_sys_sendto net/socket.c:2203 [inline]
 __se_sys_sendto net/socket.c:2199 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2199
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb981e7ebdc
RSP: 002b:00007ffdc7fb6880 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007fb982ad4620 RCX: 00007fb981e7ebdc
RDX: 000000000000003c RSI: 00007fb982ad4670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffdc7fb68d4 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007fb982ad4670 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/0:1/9:
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc900000e7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc900000e7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
 #2: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
1 lock held by khungtaskd/30:
 #0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
 #0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
 #0: ffffffff8e3361e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u8:3/51:
 #0: ffff88802a875948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff88802a875948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc90000bb7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc90000bb7d00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
 #2: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0x19/0x30 net/ipv6/addrconf.c:4733
4 locks held by kworker/u8:6/1057:
 #0: ffff888015ed3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff888015ed3148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc9000433fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc9000433fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
 #2: ffffffff8f5c1a10 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:594
 #3: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: wg_destruct+0x25/0x2e0 drivers/net/wireguard/device.c:246
2 locks held by dhcpcd/4749:
 #0: ffff88802c2fd678 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: netlink_dump+0xcb/0xe50 net/netlink/af_netlink.c:2277
 #1: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0x5d3/0xe50 net/netlink/af_netlink.c:2336
2 locks held by getty/4846:
 #0: ffff88802b3570a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f0e2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201
3 locks held by kworker/0:3/5111:
 #0: ffff888015081948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff888015081948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc9000371fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc9000371fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
 #2: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x91/0xea0 net/wireless/reg.c:2478
3 locks held by kworker/0:4/5157:
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3242 [inline]
 #0: ffff888015080948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x8e0/0x17c0 kernel/workqueue.c:3348
 #1: ffffc9000416fd00 (deferred_process_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3243 [inline]
 #1: ffffc9000416fd00 (deferred_process_work){+.+.}-{0:0}, at: process_scheduled_works+0x91b/0x17c0 kernel/workqueue.c:3348
 #2: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:104
7 locks held by syz-executor.3/9854:
 #0: ffff88802c738420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2871 [inline]
 #0: ffff88802c738420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc50 fs/read_write.c:586
 #1: ffff888068eb8088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325
 #2: ffff8880221b1e18 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326
 #3: ffffffff8eedcaa8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216
 #4: ffff88807a7e90e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:990 [inline]
 #4: ffff88807a7e90e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1093 [inline]
 #4: ffff88807a7e90e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1290
 #5: ffff88802e1b5250 (&devlink->lock_key#17){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672
 #6: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:772
1 lock held by syz-executor.1/9990:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
3 locks held by syz-executor.2/10113:
1 lock held by syz-executor.2/10319:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.3/10468:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.1/10626:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.2/11140:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
4 locks held by syz-executor.4/11143:
 #0: ffff88807f8ae420 (sb_writers#11){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
 #1: ffff888061e78660 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:826 [inline]
 #1: ffff888061e78660 (&type->i_mutex_dir_key#7/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3900
 #2: ffffffff8e363ac8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock include/linux/cgroup.h:368 [inline]
 #2: ffffffff8e363ac8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_kn_lock_live+0xe6/0x290 kernel/cgroup/cgroup.c:1662
 #3: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: cgrp_css_online+0x90/0x2f0 net/core/netprio_cgroup.c:157
1 lock held by syz-executor.3/11278:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.0/11281:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: __tun_chr_ioctl+0x48f/0x2400 drivers/net/tun.c:3110
1 lock held by syz-executor.1/11287:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.4/11291:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.0/11295:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592
1 lock held by syz-executor.2/11301:
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
 #0: ffffffff8f5ce3c8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x842/0x10d0 net/core/rtnetlink.c:6592

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

NMI backtrace for cpu 1
CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline]
 watchdog+0xfde/0x1020 kernel/hung_task.c:380
 kthread+0x2f0/0x390 kernel/kthread.c: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 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 10113 Comm: syz-executor.2 Not tainted 6.9.0-syzkaller-07387-g8c06da67d0bd #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58
Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 cc cc cc cc 66 0f 1f 84 00 00 00 00 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb
RSP: 0018:ffffc9000f9b7d10 EFLAGS: 00050202
RAX: 0000000000000003 RBX: 0000000020000028 RCX: 0000000000000028
RDX: 0000000000000000 RSI: ffffc9000f9b7df0 RDI: 0000000020000000
RBP: ffffc9000f9b7ec8 R08: ffffc9000f9b7e17 R09: 1ffff92001f36fc2
R10: dffffc0000000000 R11: fffff52001f36fc3 R12: 0000000000000028
R13: ffffc9000f9b7df0 R14: 0000000020000000 R15: ffffc9000f9b7df0
FS:  00007ffacf6d26c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 00000000250d2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 copy_user_generic arch/x86/include/asm/uaccess_64.h:110 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:131 [inline]
 _copy_to_user+0x86/0xb0 lib/usercopy.c:41
 copy_to_user include/linux/uaccess.h:191 [inline]
 __tun_chr_ioctl+0xb6a/0x2400 drivers/net/tun.c:3125
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:904 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:890
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fface87cee9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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:00007ffacf6d20c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fface9abf80 RCX: 00007fface87cee9
RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000003
RBP: 00007fface8c949e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fface9abf80 R15: 00007ffc8099ee48
 </TASK>

Crashes (315):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/16 06:13 upstream 8c06da67d0bd ef5d53ed .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in linkwatch_event
2024/04/19 19:11 upstream 3cdb45594619 af24b050 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in linkwatch_event
2024/04/07 20:03 upstream 480e035fc4c7 ca620dd8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/12 10:56 upstream 855684c7d938 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/11 11:23 upstream e8f897f4afef 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/07 10:23 upstream 67be068d31d4 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/05 21:31 upstream 90d35da658da f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in linkwatch_event
2024/03/05 08:45 upstream 90d35da658da 5fc53669 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/02 19:19 upstream 5ad3cb0ed525 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in linkwatch_event
2024/03/02 11:45 upstream 17ba56605bfd 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/02 08:06 upstream 17ba56605bfd 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/02 07:26 upstream 17ba56605bfd 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in linkwatch_event
2024/03/01 10:16 upstream 87adedeba51a 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in linkwatch_event
2024/02/29 17:36 upstream 805d849d7c3c 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/02/26 19:54 upstream d206a76d7d27 edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in linkwatch_event
2024/02/25 12:34 upstream ab0a97cffa0b 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/02/24 07:09 upstream 603c04e27c3e 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in linkwatch_event
2024/02/22 16:25 upstream 39133352cbed 345111b5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2024/03/09 18:39 upstream 09e5c48fea17 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-386 INFO: task hung in linkwatch_event
2023/05/31 17:38 upstream afead42fdfca 09898419 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-fs INFO: task hung in linkwatch_event
2022/10/10 22:48 upstream 4899a36f91a9 aea5da89 .config console log report info [disk image] [vmlinux] ci-upstream-kasan-gce INFO: task hung in linkwatch_event
2022/07/10 14:33 upstream b1c428b6c368 b5765a15 .config console log report info ci-upstream-kasan-gce-selinux-root INFO: task hung in linkwatch_event
2024/03/09 17:15 net c8a5c731fd12 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/03/03 09:47 net 1c61728be22c 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/03/03 00:21 net 1c61728be22c 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/03/02 04:25 net 1c61728be22c 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/03/01 03:14 net b611b776a9c8 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/28 23:08 net 4adfc94d4aec d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/26 20:57 net 1a825e4cdf45 edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/26 17:08 net 1a825e4cdf45 edd6a5e9 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/26 09:21 net 2a770cdc4382 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/23 22:16 net 3773d65ae515 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/23 12:06 net 3773d65ae515 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/23 06:12 net 359e54a93ab4 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/02/22 23:41 net 359e54a93ab4 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: task hung in linkwatch_event
2024/05/12 02:33 net-next cddd2dc6390b 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/05/12 00:53 net-next cddd2dc6390b 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/12 12:15 net-next 76839e2f1fde 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/11 23:05 net-next c2b25092864a 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/09 19:45 net-next d7e14e534493 6ee49f2e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/08 02:07 net-next a148f82c457f 2b789849 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/05 23:09 net-next 885c36e59f46 f39a7eed .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/05 12:22 net-next 09fcde547761 5fc53669 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/03/01 22:59 net-next e96082570933 25905f5d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/02/29 10:25 net-next 4ac828960a60 352ab904 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/02/28 09:50 net-next 4440873f3655 d367cbe5 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/02/27 20:07 net-next 25d434257464 05e69c83 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/02/24 21:58 net-next d662c5b3ce6d 8d446f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2022/05/13 15:58 net-next-old b67fd3d9d942 107f6434 .config console log report info ci-upstream-net-kasan-gce INFO: task hung in linkwatch_event
2024/05/17 05:15 linux-next c75962170e49 c2e07261 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/05/16 03:15 linux-next 82d92a9a1b9e 0b3dad46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/05/15 16:33 linux-next 82d92a9a1b9e 0b3dad46 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/05/14 04:52 linux-next 6ba6c795dc73 fdb4c10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/05/06 10:31 linux-next 2b84edefcad1 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/05/06 00:10 linux-next 9221b2819b8a 610f2a54 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/04/30 23:51 linux-next d04466706db5 9e0e6af1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2024/04/26 17:07 linux-next bb7a2467e6be 059e9963 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in linkwatch_event
2023/06/01 07:21 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 243ff7e6a035 babc4389 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-usb INFO: task hung in linkwatch_event
* Struck through repros no longer work on HEAD.