INFO: task kworker/u4:3:57 blocked for more than 143 seconds. Not tainted 5.14.0-rc3-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:3 state:D stack:26128 pid: 57 ppid: 2 flags:0x00004000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:4683 [inline] __schedule+0x93a/0x26f0 kernel/sched/core.c:5940 schedule+0xd3/0x270 kernel/sched/core.c:6019 schedule_timeout+0x1db/0x2a0 kernel/time/timer.c:1855 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+0x176/0x280 kernel/sched/completion.c:138 __synchronize_srcu+0x1f4/0x290 kernel/rcu/srcutree.c:930 fsnotify_mark_destroy_workfn+0xfd/0x340 fs/notify/mark.c:832 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Showing all locks held in the system: 3 locks held by kworker/0:1/7: 2 locks held by ksoftirqd/0/13: 2 locks held by kworker/u4:3/57: #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc90000f9fdb0 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 2 locks held by kworker/u4:4/129: #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff888010869138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc900013afdb0 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 1 lock held by khungtaskd/1647: #0: ffffffff8b97ba40 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by khugepaged/1662: #0: ffffffff8ba5e948 (lock#6){+.+.}-{3:3}, at: __lru_add_drain_all+0x65/0x760 mm/swap.c:791 1 lock held by systemd-udevd/4873: 1 lock held by in:imklog/8269: #0: ffff888011d9cd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:974 3 locks held by kworker/1:7/10141: #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:620 [inline] #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:617 [inline] #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: ffff88802757d138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x1630 kernel/workqueue.c:2247 #1: ffffc9000a747db0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8a5/0x1630 kernel/workqueue.c:2251 #2: ffffffff8d0cc6a8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xa3/0x1340 net/ipv6/addrconf.c:4031 4 locks held by kworker/u4:7/16665: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1647 Comm: khungtaskd Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xd0a/0xfc0 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 13 Comm: ksoftirqd/0 Not tainted 5.14.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:match_held_lock+0xe/0xc0 kernel/locking/lockdep.c:5077 Code: 48 c7 c7 40 db 8b 89 e8 66 7a be ff e8 cd 1a cd ff 31 c0 5d c3 0f 1f 80 00 00 00 00 53 48 89 fb 48 83 ec 08 48 39 77 10 74 6a <66> f7 47 22 f0 ff 74 5a 48 8b 46 08 48 89 f7 48 85 c0 74 42 8b 15 RSP: 0018:ffffc90000d27410 EFLAGS: 00000093 RAX: 0000000000000005 RBX: ffff888010a68a18 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8d0cc6a8 RDI: ffff888010a68a18 RBP: ffffffff8d0cc6a8 R08: ffffc90000d276d8 R09: ffffc90000d276c8 R10: ffffffff87d55c4a R11: 0000000000000000 R12: ffff888010a68000 R13: ffff888010a689f0 R14: 00000000ffffffff R15: ffff888010a68a18 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000052f7b0 CR3: 000000001d209000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __lock_is_held kernel/locking/lockdep.c:5368 [inline] lock_is_held_type+0xa7/0x140 kernel/locking/lockdep.c:5668 lock_is_held include/linux/lockdep.h:283 [inline] lockdep_rtnl_is_held+0x17/0x30 net/core/rtnetlink.c:137 __in6_dev_get include/net/addrconf.h:313 [inline] ip6_ignore_linkdown include/net/addrconf.h:404 [inline] find_match.part.0+0x78/0xcc0 net/ipv6/route.c:737 find_match net/ipv6/route.c:824 [inline] __find_rr_leaf+0x17f/0xd20 net/ipv6/route.c:825 find_rr_leaf net/ipv6/route.c:846 [inline] rt6_select net/ipv6/route.c:890 [inline] fib6_table_lookup+0x649/0xa20 net/ipv6/route.c:2174 ip6_pol_route+0x1c5/0x11d0 net/ipv6/route.c:2210 pol_lookup_func include/net/ip6_fib.h:579 [inline] fib6_rule_lookup+0x111/0x6f0 net/ipv6/fib6_rules.c:115 ip6_route_input_lookup net/ipv6/route.c:2280 [inline] ip6_route_input+0x63c/0xb30 net/ipv6/route.c:2576 ip6_rcv_finish_core.constprop.0.isra.0+0x168/0x570 net/ipv6/ip6_input.c:63 ip6_rcv_finish net/ipv6/ip6_input.c:74 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ipv6_rcv+0x229/0x3c0 net/ipv6/ip6_input.c:297 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5498 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5612 process_backlog+0x2a5/0x6c0 net/core/dev.c:6492 __napi_poll+0xaf/0x440 net/core/dev.c:7047 napi_poll net/core/dev.c:7114 [inline] net_rx_action+0x801/0xb40 net/core/dev.c:7201 __do_softirq+0x292/0xa27 kernel/softirq.c:559 run_ksoftirqd kernel/softirq.c:923 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:915 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 48 c7 c7 40 db 8b 89 mov $0xffffffff898bdb40,%rdi 7: e8 66 7a be ff callq 0xffbe7a72 c: e8 cd 1a cd ff callq 0xffcd1ade 11: 31 c0 xor %eax,%eax 13: 5d pop %rbp 14: c3 retq 15: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1c: 53 push %rbx 1d: 48 89 fb mov %rdi,%rbx 20: 48 83 ec 08 sub $0x8,%rsp 24: 48 39 77 10 cmp %rsi,0x10(%rdi) 28: 74 6a je 0x94 * 2a: 66 f7 47 22 f0 ff testw $0xfff0,0x22(%rdi) <-- trapping instruction 30: 74 5a je 0x8c 32: 48 8b 46 08 mov 0x8(%rsi),%rax 36: 48 89 f7 mov %rsi,%rdi 39: 48 85 c0 test %rax,%rax 3c: 74 42 je 0x80 3e: 8b .byte 0x8b 3f: 15 .byte 0x15