netlink: 12 bytes leftover after parsing attributes in process `syz-executor4'. INFO: task kworker/u4:1:21 blocked for more than 140 seconds. Not tainted 4.20.0+ #176 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D14312 21 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136 __synchronize_srcu+0x20a/0x2d0 kernel/rcu/srcutree.c:946 synchronize_srcu_expedited kernel/rcu/srcutree.c:971 [inline] synchronize_srcu+0x356/0x5ab kernel/rcu/srcutree.c:1022 fsnotify_connector_destroy_workfn+0x44/0xa0 fs/notify/mark.c:176 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 INFO: task kworker/u4:4:3040 blocked for more than 140 seconds. Not tainted 4.20.0+ #176 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:4 D13784 3040 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136 __synchronize_srcu+0x20a/0x2d0 kernel/rcu/srcutree.c:946 synchronize_srcu+0x440/0x5ab kernel/rcu/srcutree.c:1024 fsnotify_mark_destroy_workfn+0x1be/0x510 fs/notify/mark.c:799 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 INFO: task syz-executor2:24090 blocked for more than 140 seconds. Not tainted 4.20.0+ #176 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D22936 24090 15943 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x86c/0x1ed0 kernel/sched/core.c:3472 schedule+0xef/0x370 kernel/sched/core.c:3516 schedule_timeout+0x1cc/0x260 kernel/time/timer.c:1779 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common kernel/sched/completion.c:115 [inline] wait_for_completion+0x427/0x8a0 kernel/sched/completion.c:136 __flush_work+0x59c/0x9b0 kernel/workqueue.c:2917 flush_work kernel/workqueue.c:2938 [inline] flush_delayed_work+0xbe/0x160 kernel/workqueue.c:3062 fsnotify_wait_marks_destroyed+0x15/0x20 fs/notify/mark.c:810 fsnotify_destroy_group+0x1a1/0x430 fs/notify/group.c:88 inotify_release+0x37/0x50 fs/notify/inotify/inotify_user.c:281 __fput+0x385/0xa50 fs/file_table.c:278 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x411c91 Code: 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 31 c0 c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 48 07 b0 20 41 00 31 c0 c3 66 0f 1f 44 00 00 41 54 55 53 80 bf d4 RSP: 002b:00007ffc745dcc00 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000411c91 RDX: 0000000000000000 RSI: 0000000000740b50 RDI: 0000000000000005 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc745dcb30 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 000000000000016b R15: 0000000000000002 Showing all locks held in the system: 2 locks held by kworker/u4:1/21: #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:218 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124 #1: 00000000758f2496 (connector_reaper_work){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128 1 lock held by khungtaskd/1040: #0: 00000000ed8189b8 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4389 3 locks held by kworker/0:2/2967: 2 locks held by kworker/u4:4/3040: #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:218 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 000000002b418219 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xb43/0x1c40 kernel/workqueue.c:2124 #1: 00000000b64c3949 ((reaper_work).work){+.+.}, at: process_one_work+0xb9a/0x1c40 kernel/workqueue.c:2128 1 lock held by rsyslogd/8345: #0: 000000006a4cb602 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:795 2 locks held by getty/8467: #0: 00000000f1d1cb22 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006eee8204 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8468: #0: 00000000c603c45b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000004324307f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8469: #0: 00000000108fe282 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000068ff7e9 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8470: #0: 000000001148ad48 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000ec7f41d4 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8471: #0: 000000008eefa009 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000d529bcf2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8472: #0: 000000001f58ca51 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000feae061d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 2 locks held by getty/8473: #0: 000000004f3f7882 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000cc7100aa (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ee0 drivers/tty/n_tty.c:2154 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 4.20.0+ #176 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+0x1d3/0x2c6 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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:205 [inline] watchdog+0xb51/0x1060 kernel/hung_task.c:289 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.228 msecs NMI backtrace for cpu 0 CPU: 0 PID: 2967 Comm: kworker/0:2 Not tainted 4.20.0+ #176 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rtc_timer_do_work RIP: 0010:hlock_class kernel/locking/lockdep.c:155 [inline] RIP: 0010:mark_lock+0xdf/0x1cc0 kernel/locking/lockdep.c:3036 Code: 8e ea 06 00 00 41 0f b7 44 24 20 66 a9 ff 1f 0f 84 b8 00 00 00 48 ba 00 00 00 00 00 fc ff df 4c 89 c1 48 c1 e9 03 0f b6 14 11 <84> d2 74 09 80 fa 03 0f 8e ef 06 00 00 25 ff 1f 00 00 4c 8d 2c 80 RSP: 0018:ffff88809eb2efa0 EFLAGS: 00000802 RAX: 00000000000000a8 RBX: 1ffff11013d65dfa RCX: 1ffff11013d5e564 RDX: 0000000000000000 RSI: ffff88809eaf2b00 RDI: ffff88809eaf2280 RBP: ffff88809eb2f0d8 R08: ffff88809eaf2b20 R09: 0000000000000002 R10: 0000000000000000 R11: ffff88809eaf2280 R12: ffff88809eaf2b00 R13: ffffed1013d5e55f R14: 0000000000000004 R15: ffff88809eb2f0b0 FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd0cc085330 CR3: 00000000a4dd0000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: mark_held_locks+0xc7/0x130 kernel/locking/lockdep.c:2740 __trace_hardirqs_on_caller kernel/locking/lockdep.c:2761 [inline] lockdep_hardirqs_on+0x19e/0x5c0 kernel/locking/lockdep.c:2814 trace_hardirqs_on+0xbd/0x310 kernel/trace/trace_preemptirq.c:30 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x82/0xd0 kernel/locking/spinlock.c:184 spin_unlock_irqrestore include/linux/spinlock.h:384 [inline] __wake_up_common_lock+0x1d0/0x330 kernel/sched/wait.c:122 __wake_up+0xe/0x10 kernel/sched/wait.c:145 rtc_handle_legacy_irq+0x8f/0xd0 drivers/rtc/interface.c:609 rtc_uie_update_irq+0x1f/0x30 drivers/rtc/interface.c:636 rtc_timer_do_work+0x287/0x11b0 drivers/rtc/interface.c:915 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352