INFO: task kworker/1:5:13122 blocked for more than 120 seconds. Not tainted 4.17.0-rc2+ #17 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/1:5 D23184 13122 2 0x80000000 Workqueue: events cgwb_release_workfn Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x801/0x1e30 kernel/sched/core.c:3490 schedule+0xef/0x430 kernel/sched/core.c:3549 bit_wait+0x18/0x90 kernel/sched/wait_bit.c:197 __wait_on_bit+0xb3/0x130 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:63 wait_on_bit include/linux/wait_bit.h:76 [inline] wb_shutdown+0x370/0x470 mm/backing-dev.c:366 cgwb_release_workfn+0x87/0x750 mm/backing-dev.c:509 kernel msg: ebtables bug: please report to author: EBT_ENTRY_OR_ENTRIES shouldn't be set in distinguisher process_one_work+0xc1e/0x1b50 kernel/workqueue.c:2145 worker_thread+0x1cc/0x1440 kernel/workqueue.c:2279 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Showing all locks held in the system: 2 locks held by kworker/u4:1/22: #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: 00000000e4665fec ((work_completion)(&sub_info->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 2 locks held by khungtaskd/892: #0: 0000000076c07795 (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 0000000076c07795 (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 00000000dee03050 (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 2 locks held by getty/4479: #0: 000000008a51f0d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000000a4d34cd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4480: #0: 000000002e7c09f0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000006516b339 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4481: #0: 00000000e95ef176 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c1df7f2b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4482: #0: 000000007093ac6d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000030ef327c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4483: #0: 00000000512e5750 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000c97c1c18 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4484: #0: 00000000f41fbbe6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000eac91bca (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4485: #0: 000000005fc8835a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000fe52a808 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by kworker/u4:5/6990: #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000aa7b8798 ((wq_completion)"events_unbound"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: 0000000098ab384b ((work_completion)(&sub_info->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 2 locks held by kworker/1:5/13122: #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000ef0d0252 ((wq_completion)"events"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: 000000002ecc4575 ((work_completion)(&wb->release_work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 1 lock held by syz-executor3/26336: #0: 00000000deedb3e0 (event_mutex){+.+.}, at: perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:235 3 locks held by syz-executor0/26355: #0: 00000000928f927c (&sig->cred_guard_mutex){+.+.}, at: __do_sys_perf_event_open+0x129f/0x2fa0 kernel/events/core.c:10475 #1: 0000000066239af9 (&pmus_srcu){....}, at: perf_event_alloc.part.91+0xfa4/0x3090 kernel/events/core.c:10034 #2: 00000000deedb3e0 (event_mutex){+.+.}, at: perf_trace_init+0x50/0x250 kernel/trace/trace_event_perf.c:217 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 892 Comm: khungtaskd Not tainted 4.17.0-rc2+ #17 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+0x1b9/0x294 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 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:138 [inline] check_hung_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4387 Comm: rs:main Q:Reg Not tainted 4.17.0-rc2+ #17 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_stack_info+0x6/0x142 arch/x86/kernel/dumpstack_64.c:109 RSP: 0018:ffff8801b0eb6e28 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff8801b0eb6e80 RCX: ffff8801b0eb6eb0 RDX: ffff8801b0eb6e90 RSI: ffff8801a9f96540 RDI: ffff8801b0eb6e80 RBP: ffff8801b0eb6e30 R08: ffffed00361d6ddd R09: ffff8801b0eb6e90 R10: ffffed00361d6ddc R11: ffff8801b0eb6ee7 R12: ffff8801a9f96540 R13: ffff8801b0eb6eb8 R14: ffff8801b0eb6f08 R15: ffff8801b0eb6e90 FS: 00007f9c09a76700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000006fe278 CR3: 00000001b1f04000 CR4: 00000000001406f0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unwind_start+0xee/0x330 arch/x86/kernel/unwind_frame.c:402 unwind_start arch/x86/include/asm/unwind.h:54 [inline] __save_stack_trace+0x4a/0xd0 arch/x86/kernel/stacktrace.c:43 save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60 save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc4/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 slab_post_alloc_hook mm/slab.h:444 [inline] slab_alloc mm/slab.c:3392 [inline] kmem_cache_alloc+0x11b/0x760 mm/slab.c:3552 kmem_cache_zalloc include/linux/slab.h:691 [inline] jbd2_alloc_handle include/linux/jbd2.h:1421 [inline] new_handle fs/jbd2/transaction.c:400 [inline] jbd2__journal_start+0x1d3/0xa70 fs/jbd2/transaction.c:425 __ext4_journal_start_sb+0x17a/0x5e0 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_da_write_begin+0x5be/0x1260 fs/ext4/inode.c:3061 generic_perform_write+0x39a/0x6a0 mm/filemap.c:3139 __generic_file_write_iter+0x26e/0x630 mm/filemap.c:3264 ext4_file_write_iter+0x388/0x1420 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x64d/0x960 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f9c0b4d419d RSP: 002b:00007f9c09a74f90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 00007f9c0b4d419d RDX: 0000000000000400 RSI: 0000000001fbda90 RDI: 0000000000000005 RBP: 0000000001fbda90 R08: 000000000200d970 R09: 00007f9c0ae52de0 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f9c09a75410 R14: 000000000200d970 R15: 0000000001fbd890 Code: 1e 48 c7 c0 54 0a 9b 88 83 ff 04 74 12 83 ef 05 31 c0 83 ff 03 77 08 48 8b 04 fd e0 ac c4 87 c3 0f 1f 44 00 00 55 48 89 e5 41 56 <41> 55 41 54 53 48 89 d3 48 85 ff 0f 84 0f 01 00 00 49 89 fc 49