device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state INFO: task kworker/1:2:2669 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 kobject: 'rx-0' (00000000068d5101): kobject_cleanup, parent 00000000ca4e5fa0 kobject: 'rx-0' (00000000068d5101): auto cleanup 'remove' event kobject: 'rx-0' (00000000068d5101): kobject_uevent_env kobject: 'rx-0' (00000000068d5101): kobject_uevent_env: uevent_suppress caused the event to drop! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kobject: 'rx-0' (00000000068d5101): auto cleanup kobject_del kworker/1:2 D26384 2669 2 0x80000000 Workqueue: ipv6_addrconf addrconf_dad_work kobject: 'rx-0' (00000000068d5101): calling ktype release Call Trace: kobject: 'rx-0': free name context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'tx-0' (00000000c72b7a49): kobject_cleanup, parent 00000000ca4e5fa0 kobject: 'tx-0' (00000000c72b7a49): auto cleanup 'remove' event schedule+0x92/0x1c0 kernel/sched/core.c:3559 kobject: 'tx-0' (00000000c72b7a49): kobject_uevent_env schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 kobject: 'tx-0' (00000000c72b7a49): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (00000000c72b7a49): auto cleanup kobject_del kobject: 'tx-0' (00000000c72b7a49): calling ktype release __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 kobject: 'tx-0': free name kobject: 'queues' (00000000ca4e5fa0): kobject_cleanup, parent (null) kobject: 'queues' (00000000ca4e5fa0): calling ktype release mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 kobject: 'queues' (00000000ca4e5fa0): kset_release kobject: 'queues': free name kobject: 'bridge548' (00000000770c35d0): kobject_uevent_env rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 addrconf_dad_work+0xa9/0x1110 net/ipv6/addrconf.c:3979 kobject: 'bridge548' (00000000770c35d0): kobject_uevent_env: uevent_suppress caused the event to drop! process_one_work+0x989/0x1750 kernel/workqueue.c:2153 kobject: 'batman_adv' (0000000056408f01): kobject_uevent_env kobject: 'batman_adv' (0000000056408f01): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (0000000056408f01): kobject_cleanup, parent (null) kobject: 'batman_adv' (0000000056408f01): calling ktype release kobject: (0000000056408f01): dynamic_kobj_release kobject: 'batman_adv': free name 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/1:4:18122 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:4 D27232 18122 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 kworker/0:0:24991 blocked for more than 140 seconds. kobject: 'rx-0' (000000001506d3b7): kobject_cleanup, parent 00000000ed0d3e59 Not tainted 4.19.89-syzkaller #0 kobject: 'rx-0' (000000001506d3b7): auto cleanup 'remove' event "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kobject: 'rx-0' (000000001506d3b7): kobject_uevent_env kobject: 'rx-0' (000000001506d3b7): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (000000001506d3b7): auto cleanup kobject_del kobject: 'rx-0' (000000001506d3b7): calling ktype release kobject: 'rx-0': free name kworker/0:0 D27776 24991 2 0x80000000 kobject: 'tx-0' (00000000d0c62cf6): kobject_cleanup, parent 00000000ed0d3e59 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: kobject: 'tx-0' (00000000d0c62cf6): auto cleanup 'remove' event context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'tx-0' (00000000d0c62cf6): kobject_uevent_env kobject: 'tx-0' (00000000d0c62cf6): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (00000000d0c62cf6): auto cleanup kobject_del kobject: 'tx-0' (00000000d0c62cf6): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000ed0d3e59): kobject_cleanup, parent (null) schedule+0x92/0x1c0 kernel/sched/core.c:3559 kobject: 'queues' (00000000ed0d3e59): calling ktype release kobject: 'queues' (00000000ed0d3e59): kset_release kobject: 'queues': free name kobject: 'bridge547' (000000000babf4de): kobject_uevent_env schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 kobject: 'bridge547' (000000000babf4de): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'batman_adv' (000000007b4f8f0b): kobject_uevent_env kobject: 'batman_adv' (000000007b4f8f0b): kobject_uevent_env: filter function caused the event to drop! __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 kobject: 'batman_adv' (000000007b4f8f0b): kobject_cleanup, parent (null) kobject: 'batman_adv' (000000007b4f8f0b): calling ktype release kobject: (000000007b4f8f0b): dynamic_kobj_release rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 kobject: 'batman_adv': free name addrconf_dad_work+0xa9/0x1110 net/ipv6/addrconf.c:3979 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/0:3:32106 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D27088 32106 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 syz-executor.0:19578 blocked for more than 140 seconds. Not tainted 4.19.89-syzkaller #0 kobject: 'rx-0' (0000000040e5df33): kobject_cleanup, parent 00000000f8428dad "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D24056 19578 1 0x00000004 kobject: 'rx-0' (0000000040e5df33): auto cleanup 'remove' 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 kobject: 'rx-0' (0000000040e5df33): kobject_uevent_env __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 kobject: 'rx-0' (0000000040e5df33): kobject_uevent_env: uevent_suppress caused the event to drop! rtnl_lock net/core/rtnetlink.c:77 [inline] rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:4765 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 kobject: 'rx-0' (0000000040e5df33): auto cleanup kobject_del kobject: 'rx-0' (0000000040e5df33): calling ktype release rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4786 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x53a/0x730 net/netlink/af_netlink.c:1343 kobject: 'rx-0': free name kobject: 'tx-0' (00000000cf7b5c0a): kobject_cleanup, parent 00000000f8428dad netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 kobject: 'tx-0' (00000000cf7b5c0a): auto cleanup 'remove' event kobject: 'tx-0' (00000000cf7b5c0a): kobject_uevent_env kobject: 'tx-0' (00000000cf7b5c0a): kobject_uevent_env: uevent_suppress caused the event to drop! sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 kobject: 'tx-0' (00000000cf7b5c0a): auto cleanup kobject_del kobject: 'tx-0' (00000000cf7b5c0a): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (00000000f8428dad): kobject_cleanup, parent (null) kobject: 'queues' (00000000f8428dad): calling ktype release kobject: 'queues' (00000000f8428dad): kset_release kobject: 'queues': free name kobject: 'bridge546' (00000000a01a25aa): kobject_uevent_env __do_sys_sendto net/socket.c:1799 [inline] __se_sys_sendto net/socket.c:1795 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1795 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 kobject: 'bridge546' (00000000a01a25aa): kobject_uevent_env: uevent_suppress caused the event to drop! entry_SYSCALL_64_after_hwframe+0x49/0xbe kobject: 'batman_adv' (00000000e8d363ba): kobject_uevent_env kobject: 'batman_adv' (00000000e8d363ba): kobject_uevent_env: filter function caused the event to drop! RIP: 0033:0x414603 Code: 45 ff ff ff 0f 1f 00 48 8b 83 08 01 00 00 48 89 83 18 01 00 00 48 8b 83 10 01 00 00 48 89 83 20 01 00 00 e9 06 fe ff ff 0f 1f <80> 00 00 00 00 bf 29 3d 44 00 31 c0 e8 1c ca 00 00 e9 35 ff ff ff kobject: 'batman_adv' (00000000e8d363ba): kobject_cleanup, parent (null) kobject: 'batman_adv' (00000000e8d363ba): calling ktype release kobject: (00000000e8d363ba): dynamic_kobj_release kobject: 'batman_adv': free name RSP: 002b:00007ffc0d98e338 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000a72200 RCX: 0000000000414603 RDX: 0000000000000028 RSI: 0000000000a72250 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffc0d98e340 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000a72250 R15: 0000000000000003 Showing all locks held in the system: 4 locks held by kworker/u4:0/7: #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000059c3091a ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 000000002930b1f8 (net_cleanup_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 kobject: 'rx-0' (00000000e216a707): kobject_cleanup, parent 00000000665f8594 kobject: 'rx-0' (00000000e216a707): auto cleanup 'remove' event kobject: 'rx-0' (00000000e216a707): kobject_uevent_env #2: 000000007bc1691b (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0x960 net/core/net_namespace.c:520 kobject: 'rx-0' (00000000e216a707): kobject_uevent_env: uevent_suppress caused the event to drop! #3: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 1 lock held by khungtaskd/1068: #0: 000000003be08dcf (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 3 locks held by kworker/1:2/2669: #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 kobject: 'rx-0' (00000000e216a707): auto cleanup kobject_del #1: 00000000c2a56ada ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 2 locks held by rs:main Q:Reg/7607: #0: 0000000074e8cae1 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 kobject: 'rx-0' (00000000e216a707): calling ktype release #1: 00000000a6568c8b (sb_writers#4){.+.+}, at: file_start_write include/linux/fs.h:2775 [inline] #1: 00000000a6568c8b (sb_writers#4){.+.+}, at: vfs_write+0x429/0x560 fs/read_write.c:548 kobject: 'rx-0': free name 1 lock held by rsyslogd/7609: #0: 00000000e55f3725 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:767 2 locks held by getty/7732: #0: 000000004ead7814 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'tx-0' (000000002bc6a9e3): kobject_cleanup, parent 00000000665f8594 kobject: 'tx-0' (000000002bc6a9e3): auto cleanup 'remove' event kobject: 'tx-0' (000000002bc6a9e3): kobject_uevent_env kobject: 'tx-0' (000000002bc6a9e3): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'tx-0' (000000002bc6a9e3): auto cleanup kobject_del kobject: 'tx-0' (000000002bc6a9e3): calling ktype release #1: 000000008f88288d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 kobject: 'tx-0': free name 2 locks held by getty/7733: #0: 00000000371d4a5f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000fe91dc4e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 kobject: 'queues' (00000000665f8594): kobject_cleanup, parent (null) 2 locks held by getty/7734: kobject: 'queues' (00000000665f8594): calling ktype release #0: 0000000038cbc194 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'queues' (00000000665f8594): kset_release #1: 000000003192ac4c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7735: #0: 00000000ec79042d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000005f1f4e60 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 kobject: 'queues': free name 2 locks held by getty/7736: kobject: 'bridge545' (00000000afccf97b): kobject_uevent_env kobject: 'bridge545' (00000000afccf97b): kobject_uevent_env: uevent_suppress caused the event to drop! #0: 00000000e9f10c7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'batman_adv' (000000000758df64): kobject_uevent_env #1: 0000000039500aba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 kobject: 'batman_adv' (000000000758df64): kobject_uevent_env: filter function caused the event to drop! 2 locks held by getty/7737: kobject: 'batman_adv' (000000000758df64): kobject_cleanup, parent (null) #0: 00000000e18da8d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000007a0a1559 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 kobject: 'batman_adv' (000000000758df64): calling ktype release kobject: (000000000758df64): dynamic_kobj_release 2 locks held by getty/7738: kobject: 'batman_adv': free name #0: 000000002dd1bd80 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000027bc4baa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 3 locks held by kworker/1:4/18122: #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000727b3726 ((linkwatch_work).work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:0/24991: #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 0000000021144d73 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 0000000037d3cc6e ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:3/32106: #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000a025c3b7 ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 000000004a587ab2 (deferred_process_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 1 lock held by syz-executor.0/19578: #0: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 00000000c7dc9f45 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:4765 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1068 Comm: khungtaskd Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3669 Comm: udevd Not tainted 4.19.89-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:atomic64_cmpxchg include/asm-generic/atomic-instrumented.h:63 [inline] RIP: 0010:__mutex_unlock_slowpath+0xeb/0x6b0 kernel/locking/mutex.c:1218 Code: 00 00 00 fc ff df 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 65 48 8b 04 25 40 ee 01 00 48 89 85 70 ff ff ff eb 27 4c 89 f3 08 00 00 00 4c 89 ff e8 68 2e 57 fa 83 e3 07 4c 89 f0 f0 49 0f RSP: 0018:ffff888095e97b28 EFLAGS: 00000246 RAX: ffff888095e8c400 RBX: ffff888095e8c400 RCX: ffffffff874b99cb RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88809598d300 RBP: ffff888095e97bd8 R08: 1ffff11012b31a60 R09: ffffed1012b31a61 R10: 0000000000000000 R11: ffff88809598d307 R12: 0000000000000003 R13: fffffbfff159215c R14: ffff888095e8c400 R15: ffff88809598d300 FS: 00007fe465b547a0(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000a0f140 CR3: 0000000095e01000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: mutex_unlock+0xd/0x10 kernel/locking/mutex.c:713 ep_scan_ready_list+0x792/0xb20 fs/eventpoll.c:755 ep_send_events fs/eventpoll.c:1713 [inline] ep_poll+0x3b4/0xd10 fs/eventpoll.c:1840 do_epoll_wait+0x1b3/0x200 fs/eventpoll.c:2198 __do_sys_epoll_wait fs/eventpoll.c:2208 [inline] __se_sys_epoll_wait fs/eventpoll.c:2205 [inline] __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2205 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fe465268943 Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 RSP: 002b:00007ffd76802838 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fe465268943 RDX: 0000000000000008 RSI: 00007ffd76802930 RDI: 000000000000000a RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000001931eb0 R15: 00000000018e2030