INFO: task kworker/u4:7:8376 blocked for more than 143 seconds. Not tainted 5.7.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:7 D24416 8376 2 0x80004000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f90 kernel/sched/core.c:4156 schedule+0xd0/0x2a0 kernel/sched/core.c:4231 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1873 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __synchronize_srcu+0x1a7/0x260 kernel/rcu/srcutree.c:935 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:164 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 INFO: task kworker/u4:4:28334 blocked for more than 146 seconds. Not tainted 5.7.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D27504 28334 2 0x80004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:3430 [inline] __schedule+0x8f3/0x1f90 kernel/sched/core.c:4156 schedule+0xd0/0x2a0 kernel/sched/core.c:4231 schedule_timeout+0x55b/0x850 kernel/time/timer.c:1873 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x16a/0x270 kernel/sched/completion.c:138 __synchronize_srcu+0x1a7/0x260 kernel/rcu/srcutree.c:935 fsnotify_mark_destroy_workfn+0xfd/0x330 fs/notify/mark.c:832 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Showing all locks held in the system: 4 locks held by kworker/u4:3/44: 1 lock held by khungtaskd/1147: #0: ffffffff899be040 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779 1 lock held by systemd-udevd/3880: 1 lock held by in:imklog/6525: #0: ffff888094fabe30 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826 2 locks held by kworker/u4:7/8376: #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:279 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90001c57dc0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 5 locks held by kworker/1:5/17878: 2 locks held by kworker/u4:4/28334: #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: __write_once_size include/linux/compiler.h:279 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:855 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:40 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:615 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:642 [inline] #0: ffff8880aa034138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x844/0x16a0 kernel/workqueue.c:2239 #1: ffffc90001dd7dc0 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x878/0x16a0 kernel/workqueue.c:2243 1 lock held by syz-executor.3/7988: 3 locks held by syz-executor.4/8001: #0: ffff8880ae637d58 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1261 [inline] #0: ffff8880ae637d58 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x233/0x1f90 kernel/sched/core.c:4102 #1: ffff8880ae622ec8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x304/0x410 kernel/sched/psi.c:817 #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: bit_spin_lock include/linux/bit_spinlock.h:27 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: rht_lock include/linux/rhashtable.h:331 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: __rhashtable_remove_fast_one include/linux/rhashtable.h:1009 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: __rhashtable_remove_fast include/linux/rhashtable.h:1090 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: rhashtable_remove_fast include/linux/rhashtable.h:1119 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: netlink_remove net/netlink/af_netlink.c:598 [inline] #2: ffff8880a00e7e38 (rhashtable_bucket){+.-.}-{0:0}, at: netlink_release+0x358/0x1c70 net/netlink/af_netlink.c:740 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1147 Comm: khungtaskd Not tainted 5.7.0-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+0x188/0x20d lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x231/0x27e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xa8c/0x1010 kernel/hung_task.c:289 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 17878 Comm: kworker/1:5 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events ipvlan_process_multicast RIP: 0010:lock_is_held_type+0xf2/0x360 kernel/locking/lockdep.c:4995 Code: 00 00 65 48 8b 2c 25 00 1f 02 00 48 8d bd cc 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 48 89 f8 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 04 02 00 00 83 85 cc 08 RSP: 0018:ffffc90000da84e0 EFLAGS: 00000807 RAX: ffff88805b02aacc RBX: ffffffff899be040 RCX: 1ffffffff12c4125 RDX: 0000000000000000 RSI: 00000000ffffffff RDI: ffff88805b02aacc RBP: ffff88805b02a200 R08: ffff88805b02a200 R09: ffffed1015ce7184 R10: ffff8880ae738c1b R11: ffffed1015ce7183 R12: 0000000000000000 R13: ffffc90000da8860 R14: 0000000000000000 R15: ffff8880926bb2a0 FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000078bf04 CR3: 00000000a70a6000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_is_held include/linux/lockdep.h:425 [inline] rcu_read_lock_held kernel/rcu/update.c:320 [inline] rcu_read_lock_held+0x9c/0xb0 kernel/rcu/update.c:314 __find_rr_leaf+0x380/0x980 net/ipv6/route.c:802 find_rr_leaf net/ipv6/route.c:858 [inline] rt6_select net/ipv6/route.c:902 [inline] fib6_table_lookup+0x629/0xcc0 net/ipv6/route.c:2189 ip6_pol_route+0x1c9/0xc20 net/ipv6/route.c:2225 fib6_rule_lookup+0x112/0x750 net/ipv6/fib6_rules.c:114 ip6_route_input+0x5f0/0xa40 net/ipv6/route.c:2464 ip6_rcv_finish_core.isra.0+0x168/0x580 net/ipv6/ip6_input.c:63 ip6_rcv_finish+0x176/0x310 net/ipv6/ip6_input.c:74 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0xf8/0x3f0 net/ipv6/ip6_input.c:307 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5264 __netif_receive_skb+0x27/0x1c0 net/core/dev.c:5378 process_backlog+0x21e/0x7a0 net/core/dev.c:6222 napi_poll net/core/dev.c:6667 [inline] net_rx_action+0x4c2/0x1070 net/core/dev.c:6735 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq.part.0+0x10f/0x160 kernel/softirq.c:337 do_softirq kernel/softirq.c:329 [inline] __local_bh_enable_ip+0x20e/0x270 kernel/softirq.c:189 local_bh_enable include/linux/bottom_half.h:32 [inline] ipvlan_process_multicast+0x7e6/0xca0 drivers/net/ipvlan/ipvlan_core.c:279 process_one_work+0x965/0x16a0 kernel/workqueue.c:2268 worker_thread+0x96/0xe20 kernel/workqueue.c:2414 kthread+0x388/0x470 kernel/kthread.c:268 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351