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/1:4:7594 blocked for more than 140 seconds. Not tainted 4.19.86-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kobject: 'rx-0' (00000000df5d13ae): kobject_cleanup, parent 000000007943d5a9 kworker/1:4 D27856 7594 2 0x80000000 Workqueue: ipv6_addrconf addrconf_verify_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 kobject: 'rx-0' (00000000df5d13ae): auto cleanup 'remove' event __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 kobject: 'rx-0' (00000000df5d13ae): kobject_uevent_env kobject: 'rx-0' (00000000df5d13ae): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'rx-0' (00000000df5d13ae): auto cleanup kobject_del kobject: 'rx-0' (00000000df5d13ae): calling ktype release mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 kobject: 'rx-0': free name addrconf_verify_work+0xe/0x20 net/ipv6/addrconf.c:4459 process_one_work+0x989/0x1750 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x354/0x420 kernel/kthread.c:246 kobject: 'tx-0' (0000000051180030): kobject_cleanup, parent 000000007943d5a9 kobject: 'tx-0' (0000000051180030): auto cleanup 'remove' event ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task kworker/0:3:9957 blocked for more than 140 seconds. kobject: 'tx-0' (0000000051180030): kobject_uevent_env Not tainted 4.19.86-syzkaller #0 kobject: 'tx-0' (0000000051180030): kobject_uevent_env: uevent_suppress caused the event to drop! "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:3 D28320 9957 2 0x80000000 Workqueue: events linkwatch_event Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x866/0x1dc0 kernel/sched/core.c:3515 kobject: 'tx-0' (0000000051180030): auto cleanup kobject_del kobject: 'tx-0' (0000000051180030): calling ktype release kobject: 'tx-0': free name kobject: 'queues' (000000007943d5a9): kobject_cleanup, parent (null) schedule+0x92/0x1c0 kernel/sched/core.c:3559 kobject: 'queues' (000000007943d5a9): calling ktype release schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3617 kobject: 'queues' (000000007943d5a9): kset_release __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x726/0x1300 kernel/locking/mutex.c:1072 kobject: 'queues': free name kobject: 'bridge5355' (0000000068555e3a): kobject_uevent_env kobject: 'bridge5355' (0000000068555e3a): kobject_uevent_env: uevent_suppress caused the event to drop! kobject: 'batman_adv' (0000000018a018f0): kobject_uevent_env kobject: 'batman_adv' (0000000018a018f0): kobject_uevent_env: filter function caused the event to drop! kobject: 'batman_adv' (0000000018a018f0): kobject_cleanup, parent (null) kobject: 'batman_adv' (0000000018a018f0): calling ktype release mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087 kobject: (0000000018a018f0): dynamic_kobj_release kobject: 'batman_adv': free name 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/1:1:15200 blocked for more than 140 seconds. Not tainted 4.19.86-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:1 D29120 15200 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.4:17386 blocked for more than 140 seconds. Not tainted 4.19.86-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D23712 17386 1 0x00000004 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 net/core/rtnetlink.c:77 [inline] rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:4744 netlink_rcv_skb+0x17d/0x460 net/netlink/af_netlink.c:2454 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4765 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x537/0x720 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1908 sock_sendmsg_nosec net/socket.c:622 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:632 __sys_sendto+0x262/0x380 net/socket.c:1787 __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 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x414373 Code: c3 66 0f 1f 44 00 00 41 54 55 53 48 89 fb 48 83 ec 10 0f bf 47 4a 48 0f bf d0 89 c1 8b 47 54 48 03 57 68 29 c8 83 f8 01 89 44 <24> 04 b8 90 f7 ff ff 48 89 54 24 08 0f 8e e7 01 00 00 80 3a 31 0f RSP: 002b:00007ffff1a0d998 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000a72200 RCX: 0000000000414373 RDX: 000000000000006c RSI: 0000000000a72250 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00007ffff1a0d9a0 R09: 000000000000000c R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000a72250 R15: 0000000000000003 Showing all locks held in the system: kobject: 'rx-0' (000000005f44de04): kobject_cleanup, parent 00000000e7f2b43d 1 lock held by khungtaskd/1040: #0: 00000000d35d155e (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4438 kobject: 'rx-0' (000000005f44de04): auto cleanup 'remove' event 1 lock held by rsyslogd/7388: 2 locks held by getty/7510: kobject: 'rx-0' (000000005f44de04): kobject_uevent_env #0: 0000000050560e98 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'rx-0' (000000005f44de04): kobject_uevent_env: uevent_suppress caused the event to drop! #1: 000000006db7b291 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'rx-0' (000000005f44de04): auto cleanup kobject_del 2 locks held by getty/7511: #0: 00000000719abdf0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'rx-0' (000000005f44de04): calling ktype release #1: 00000000c5abbede (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7512: #0: 00000000a66a14ca (&tty->ldisc_sem){++++} kobject: 'rx-0': free name , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'tx-0' (00000000f907fe0f): kobject_cleanup, parent 00000000e7f2b43d #1: kobject: 'tx-0' (00000000f907fe0f): auto cleanup 'remove' event 00000000eb825cdf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7513: #0: 00000000fcf155b8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 0000000087161171 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7514: #0: 000000006fc4d822 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 00000000fa362634 (&ldata->atomic_read_lock kobject: 'tx-0' (00000000f907fe0f): kobject_uevent_env ){+.+.} kobject: 'tx-0' (00000000f907fe0f): kobject_uevent_env: uevent_suppress caused the event to drop! , at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 2 locks held by getty/7515: kobject: 'tx-0' (00000000f907fe0f): auto cleanup kobject_del #0: kobject: 'tx-0' (00000000f907fe0f): calling ktype release 00000000dffc0592 kobject: 'tx-0': free name ( kobject: 'queues' (00000000e7f2b43d): kobject_cleanup, parent (null) &tty->ldisc_sem kobject: 'queues' (00000000e7f2b43d): calling ktype release ){++++} kobject: 'queues' (00000000e7f2b43d): kset_release , at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 kobject: 'queues': free name #1: 000000009b23bcfd kobject: 'bridge5354' (00000000d83be70f): kobject_uevent_env ( kobject: 'bridge5354' (00000000d83be70f): kobject_uevent_env: uevent_suppress caused the event to drop! &ldata->atomic_read_lock kobject: 'batman_adv' (0000000008910561): kobject_uevent_env ){+.+.} kobject: 'batman_adv' (0000000008910561): kobject_uevent_env: filter function caused the event to drop! , at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 kobject: 'batman_adv' (0000000008910561): kobject_cleanup, parent (null) 2 locks held by getty/7516: kobject: 'batman_adv' (0000000008910561): calling ktype release #0: kobject: (0000000008910561): dynamic_kobj_release 00000000a0aefe1c kobject: 'batman_adv': free name (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:362 #1: 000000003798464d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b30 drivers/tty/n_tty.c:2154 3 locks held by kworker/1:4/7594: #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000007899a845 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 000000007c3ee858 ((addr_chk_work).work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 4 locks held by kworker/u4:8/8086: #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000c3e70e4c ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 000000009e3c5260 (net_cleanup_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 000000003e7de699 (pernet_ops_rwsem){++++}, at: cleanup_net+0xae/0x970 net/core/net_namespace.c:520 #3: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/0:3/9957: #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 000000004b508ff4 ((linkwatch_work).work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 3 locks held by kworker/1:1/15200: #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:220 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000652172bb ((wq_completion)"events"){+.+.}, at: process_one_work+0x87e/0x1750 kernel/workqueue.c:2124 #1: 00000000d91796d5 (deferred_process_work){+.+.}, at: process_one_work+0x8b4/0x1750 kernel/workqueue.c:2128 #2: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20 net/core/rtnetlink.c:77 1 lock held by syz-executor.4/17386: #0: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline] #0: 000000001ea80c70 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:4744 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 4.19.86-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 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60