device bridge_slave_0 left promiscuous mode bridge79: port 1(bridge_slave_0) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state INFO: task kworker/1:1:24 blocked for more than 140 seconds. Not tainted 4.19.88-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:1 D27024 24 2 0x80000000 Workqueue: ipv6_addrconf addrconf_dad_work kobject: 'rx-0' (0000000031888e29): kobject_cleanup, parent 0000000098a8cc60 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'rx-0' (0000000031888e29): auto cleanup 'remove' event kobject: 'rx-0' (0000000031888e29): kobject_uevent_env kobject: 'rx-0' (0000000031888e29): kobject_uevent_env: uevent_suppress caused the event to drop! schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 kobject: 'rx-0' (0000000031888e29): auto cleanup kobject_del __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 kobject: 'rx-0' (0000000031888e29): calling ktype release kobject: 'rx-0': free name kobject: 'tx-0' (00000000047d7533): kobject_cleanup, parent 0000000098a8cc60 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 kobject: 'tx-0' (00000000047d7533): auto cleanup 'remove' event rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 kobject: 'tx-0' (00000000047d7533): kobject_uevent_env addrconf_dad_work+0xa9/0x1110 net/ipv6/addrconf.c:3975 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 kobject: 'tx-0' (00000000047d7533): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (00000000047d7533): auto cleanup kobject_del worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 kobject: 'tx-0' (00000000047d7533): calling ktype release kobject: 'tx-0': free name ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 kobject: 'queues' (0000000098a8cc60): kobject_cleanup, parent (null) INFO: task kworker/0:0:26917 blocked for more than 140 seconds. kobject: 'queues' (0000000098a8cc60): calling ktype release Not tainted 4.19.88-syzkaller #0 kobject: 'queues' (0000000098a8cc60): kset_release "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kobject: 'queues': free name kworker/0:0 D26096 26917 2 0x80000000 kobject: 'bridge24' (000000002a979d67): kobject_uevent_env Workqueue: ipv6_addrconf addrconf_dad_work kobject: 'bridge24' (000000002a979d67): kobject_uevent_env: uevent_suppress caused the event to drop! Call Trace: kobject: 'batman_adv' (00000000d8cab872): kobject_uevent_env context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'batman_adv' (00000000d8cab872): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (00000000d8cab872): kobject_cleanup, parent (null) kobject: 'batman_adv' (00000000d8cab872): calling ktype release kobject: (00000000d8cab872): dynamic_kobj_release schedule+0x92/0x1c0 kernel/sched/core.c:3559 kobject: 'batman_adv': free name schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 addrconf_dad_work+0xa9/0x1110 net/ipv6/addrconf.c:3975 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task kworker/1:2:25087 blocked for more than 140 seconds. Not tainted 4.19.88-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:2 D27056 25087 2 0x80000000 Workqueue: events switchdev_deferred_process_work Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 switchdev_deferred_process_work+0xe/0x20 net/switchdev/switchdev.c:150 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task kworker/1:5:13213 blocked for more than 140 seconds. Not tainted 4.19.88-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:5 D27024 13213 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 schedule+0x92/0x1c0 kernel/sched/core.c:3559 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 linkwatch_event+0xf/0x70 net/core/link_watch.c:236 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.1:6722 blocked for more than 140 seconds. Not tainted 4.19.88-syzkaller #0 kobject: 'rx-0' (0000000037ef37dd): kobject_cleanup, parent 0000000048f56631 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25824 6722 6718 0x00000004 kobject: 'rx-0' (0000000037ef37dd): auto cleanup 'remove' event Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'rx-0' (0000000037ef37dd): kobject_uevent_env kobject: 'rx-0' (0000000037ef37dd): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (0000000037ef37dd): auto cleanup kobject_del kobject: 'rx-0' (0000000037ef37dd): calling ktype release schedule+0x92/0x1c0 kernel/sched/core.c:3559 kobject: 'rx-0': free name schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 kobject: 'tx-0' (000000009035f388): kobject_cleanup, parent 0000000048f56631 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 kobject: 'tx-0' (000000009035f388): auto cleanup 'remove' event kobject: 'tx-0' (000000009035f388): kobject_uevent_env kobject: 'tx-0' (000000009035f388): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (000000009035f388): auto cleanup kobject_del kobject: 'tx-0' (000000009035f388): calling ktype release mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 kobject: 'tx-0': free name kobject: 'queues' (0000000048f56631): kobject_cleanup, parent (null) rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 kobject: 'queues' (0000000048f56631): calling ktype release netdev_run_todo+0x4d4/0x7a0 net/core/dev.c:8812 kobject: 'queues' (0000000048f56631): kset_release kobject: 'queues': free name kobject: 'bridge23' (000000009a347328): kobject_uevent_env kobject: 'bridge23' (000000009a347328): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'batman_adv' (000000007df3a7da): kobject_uevent_env rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:117 kobject: 'batman_adv' (000000007df3a7da): kobject_uevent_env: filter function caused the event to drop! ip_tunnel_delete_nets+0x423/0x5f0 net/ipv4/ip_tunnel.c:1080 kobject: 'batman_adv' (000000007df3a7da): kobject_cleanup, parent (null) kobject: 'batman_adv' (000000007df3a7da): calling ktype release kobject: (000000007df3a7da): dynamic_kobj_release kobject: 'batman_adv': free name vti_exit_batch_net+0x23/0x30 net/ipv4/ip_vti.c:495 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:156 setup_net+0x400/0x740 net/core/net_namespace.c:332 copy_net_ns+0x1df/0x33c net/core/net_namespace.c:438 create_new_namespaces+0x400/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xc2/0x200 kernel/nsproxy.c:206 ksys_unshare+0x440/0x980 kernel/fork.c:2520 __do_sys_unshare kernel/fork.c:2588 [inline] __se_sys_unshare kernel/fork.c:2586 [inline] __x64_sys_unshare+0x31/0x40 kernel/fork.c:2586 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a6f9 Code: Bad RIP value. RSP: 002b:00007fe3d27b2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045a6f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe3d27b36d4 R13: 00000000004cb228 R14: 00000000004e49e8 R15: 00000000ffffffff Showing all locks held in the system: 3 locks held by kworker/1:1/24: #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000eb19dc61 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 1 lock held by khungtaskd/1068: #0: 00000000df0a71f6 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 1 lock held by rsyslogd/7611: #0: 000000000d949329 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7732: #0: 00000000c4d45c2e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000c2b5907a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7733: #0: 0000000048355358 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000075fd0a6e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7734: #0: 00000000c7bb6ac8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000bc674c7c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7735: #0: 00000000d7d7139e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000045dedf3c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7736: #0: 00000000b75f5ead (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000004c575852 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7737: #0: 00000000e0c7f05f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000097ae6db5 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7738: #0: 000000008932d80b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000009ffafc1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 3 locks held by kworker/0:0/26917: #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000008a6b0d6d ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000ead469c8 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 2 locks held by kworker/u4:3/31982: #0: 00000000c4ebaf6a (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9600 [inline] #0: 00000000c4ebaf6a (&rq->lock){-.-.}, at: pick_next_task_fair+0xfae/0x1580 kernel/sched/fair.c:6772 #1: 00000000df0a71f6 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:5989 4 locks held by kworker/u4:2/13861: #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000009cd2b97c ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000386fb1f1 (net_cleanup_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 000000008ece4d43 (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0x960 net/core/net_namespace.c:520 #3: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/1:2/25087: #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000e20f10b3 (deferred_process_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/1:5/13213: #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000041491643 ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000bf802652 ((linkwatch_work).work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 2 locks held by syz-executor.1/6722: #0: 000000008ece4d43 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x1c0/0x33c net/core/net_namespace.c:434 #1: 00000000def0be33 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 ============================================= kobject: 'rx-0' (000000001cb6aed8): kobject_cleanup, parent 00000000e4872ac8 kobject: 'rx-0' (000000001cb6aed8): auto cleanup 'remove' event NMI backtrace for cpu 0 kobject: 'rx-0' (000000001cb6aed8): kobject_uevent_env CPU: 0 PID: 1068 Comm: khungtaskd Not tainted 4.19.88-syzkaller #0 kobject: 'rx-0' (000000001cb6aed8): kobject_uevent_env: uevent_suppress caused the event to drop! Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: kobject: 'rx-0' (000000001cb6aed8): auto cleanup kobject_del __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x354/0x420 kernel/kthread.c:246 kobject: 'rx-0' (000000001cb6aed8): calling ktype release kobject: 'rx-0': free name ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.029 msecs NMI backtrace for cpu 1 CPU: 1 PID: 13861 Comm: kworker/u4:2 Not tainted 4.19.88-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:kasan_check_read+0x5/0x20 mm/kasan/kasan.c:271 Code: ff 49 0f be 02 41 83 e3 07 49 39 c3 0f 8c 3e ff ff ff eb 9f 49 89 c0 eb ad 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 89 f6 31 d2 <48> 89 e5 48 8b 4d 08 e8 5f fe ff ff 5d c3 0f 1f 00 66 2e 0f 1f 84 RSP: 0018:ffff8880ae907c28 EFLAGS: 00000046 RAX: 0000000000000007 RBX: ffff88809aa06c00 RCX: 1ffff1101038598e RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff88812c30a940 RBP: ffff8880ae907c50 R08: ffff888081c2c400 R09: 0000000000000005 R10: ffffed1009349920 R11: ffff888049a4c903 R12: ffff88812c30a940 R13: ffff88809aa06c60 R14: ffff888055f2edc0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000045a6cf CR3: 00000000a079f000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_unlock include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock+0x23/0x50 kernel/locking/spinlock.c:176 spin_unlock include/linux/spinlock.h:369 [inline] __queue_work+0x4e9/0x10a0 kernel/workqueue.c:1463 delayed_work_timer_fn+0x5d/0x90 kernel/workqueue.c:1500 call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326 expire_timers kernel/time/timer.c:1359 [inline] __run_timers kernel/time/timer.c:1684 [inline] __run_timers kernel/time/timer.c:1652 [inline] run_timer_softirq+0x449/0x16a0 kernel/time/timer.c:1697 __do_softirq+0x25c/0x921 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:console_trylock_spinning kernel/printk/printk.c:1696 [inline] RIP: 0010:vprintk_emit+0x5f8/0x6d0 kernel/printk/printk.c:1936 Code: 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 06 00 0f 85 95 00 00 00 48 83 3d 3c c4 9c 07 00 74 29 e8 ed ab 15 00 48 89 df 57 9d <0f> 1f 44 00 00 e9 c5 fe ff ff e8 d9 ab 15 00 0f 0b e8 d2 ab 15 00 RSP: 0018:ffff888048adf750 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffff888081c2c400 RBX: 0000000000000293 RCX: 1ffff110103859a3 RDX: 0000000000000000 RSI: ffffffff81559753 RDI: 0000000000000293 RBP: ffff888048adf798 R08: ffff888081c2c400 R09: ffff888081c2cd18 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000001a R13: 0000000000000200 R14: 1ffffffff11e4b71 R15: ffff8880a83b2640 vprintk_default+0x28/0x30 kernel/printk/printk.c:1979 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398 printk+0xba/0xed kernel/printk/printk.c:2012 kobject_cleanup lib/kobject.c:667 [inline] kobject_release lib/kobject.c:691 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put.cold+0x2ab/0x2e6 lib/kobject.c:708 net_rx_queue_update_kobjects+0x361/0x480 net/core/net-sysfs.c:979 remove_queue_kobjects net/core/net-sysfs.c:1567 [inline] netdev_unregister_kobject+0x155/0x1f0 net/core/net-sysfs.c:1718 rollback_registered_many+0x6bb/0xda0 net/core/dev.c:8043 unregister_netdevice_many.part.0+0x1b/0x1f0 net/core/dev.c:9129 unregister_netdevice_many net/core/dev.c:9128 [inline] default_device_exit_batch+0x34e/0x410 net/core/dev.c:9600 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:156 cleanup_net+0x404/0x960 net/core/net_namespace.c:553 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415