kworker/dying (7) used greatest stack depth: 13616 bytes left INFO: task syz-executor4:28680 blocked for more than 140 seconds. Not tainted 4.19.0-rc7-next-20181010+ #91 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D25112 28680 6132 0x00000004 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3480 schedule+0xfe/0x460 kernel/sched/core.c:3524 fanotify_get_response fs/notify/fanotify/fanotify.c:68 [inline] fanotify_handle_event+0x778/0x920 fs/notify/fanotify/fanotify.c:250 send_to_group fs/notify/fsnotify.c:240 [inline] fsnotify+0x91e/0xf10 fs/notify/fsnotify.c:376 fsnotify_perm include/linux/fsnotify.h:52 [inline] security_file_open+0x16f/0x1b0 security/security.c:1024 do_dentry_open+0x331/0x1250 fs/open.c:758 vfs_open+0xa0/0xd0 fs/open.c:880 do_last fs/namei.c:3418 [inline] path_openat+0x12bc/0x5150 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 ksys_open include/linux/syscalls.h:1292 [inline] __do_sys_creat fs/open.c:1121 [inline] __se_sys_creat fs/open.c:1119 [inline] __x64_sys_creat+0x61/0x80 fs/open.c:1119 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457519 Code: 87 0a 8b 0d dd 60 09 01 83 f9 01 0f 85 1c 01 00 00 b9 01 00 00 00 88 0d 19 66 09 01 84 c9 0f 84 fd 00 00 00 b9 01 00 00 00 88 <0d> 02 66 09 01 48 8b 05 9b 71 07 01 48 89 04 24 e8 42 2c fc ff 8b RSP: 002b:00007f54cfca2c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 0000000000457519 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f54cfca36d4 R13: 00000000004bdae2 R14: 00000000004cc628 R15: 00000000ffffffff INFO: lockdep is turned off. NMI backtrace for cpu 0 CPU: 0 PID: 980 Comm: khungtaskd Not tainted 4.19.0-rc7-next-20181010+ #91 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+0x244/0x3ab lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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:144 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline] watchdog+0xb39/0x1050 kernel/hung_task.c:265 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 0 to CPUs 1: INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.396 msecs NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.19.0-rc7-next-20181010+ #91 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lock_release+0x490/0xa10 kernel/locking/lockdep.c:3861 Code: c6 04 00 f8 65 4c 8b 24 25 40 ee 01 00 49 8d bc 24 7c 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 5f 03 00 00 48 RSP: 0018:ffff8801daf074a8 EFLAGS: 00000807 RAX: dffffc0000000000 RBX: 1ffff1003b5e0e9a RCX: 1ffff1003b5e0ea6 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8801d9af2bbc RBP: ffff8801daf075d8 R08: 1ffff1003b5e0e9e R09: 00000000000058e7 R10: 00000000000058e7 R11: 0000000000000000 R12: ffff8801d9af2340 R13: ffff8801daf075b0 R14: ffff8801d9af2340 R15: ffff8801daf074f0 FS: 0000000000000000(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600400 CR3: 00000001d5bf4000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_release include/linux/rcupdate.h:228 [inline] rcu_read_unlock include/linux/rcupdate.h:661 [inline] rebalance_domains+0x375/0xdc0 kernel/sched/fair.c:9086 _nohz_idle_balance+0x621/0x7a0 kernel/sched/fair.c:9445 nohz_idle_balance kernel/sched/fair.c:9493 [inline] run_rebalance_domains+0x2ec/0x500 kernel/sched/fair.c:9676 __do_softirq+0x30d/0xb26 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x17f/0x1c0 kernel/softirq.c:413 scheduler_ipi+0x55a/0xad0 kernel/sched/core.c:1785 smp_reschedule_interrupt+0x109/0x650 arch/x86/kernel/smp.c:278 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:828 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:57 Code: 45 d8 e8 8d bd 05 fa 48 8b 45 d8 e9 ca fe ff ff 48 89 df e8 7c bd 05 fa eb 82 90 90 90 90 90 90 90 90 90 90 55 48 89 e5 fb f4 <5d> c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 f4 5d c3 90 90 90 90 90 RSP: 0018:ffff8801d9b07c30 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b360f8a RCX: ffffffff818491aa RDX: 1ffffffff1263ec1 RSI: ffffffff818491c4 RDI: ffffffff8931f608 RBP: ffff8801d9b07c30 R08: ffff8801d9af2340 R09: ffffed003b5e5b4f R10: ffffed003b5e5b4f R11: ffff8801daf2da7b R12: ffff8801d9b07cf0 R13: ffffffff89f2c120 R14: 0000000000000000 R15: 0000000000000001 arch_safe_halt arch/x86/include/asm/paravirt.h:151 [inline] default_idle+0xbf/0x490 arch/x86/kernel/process.c:498 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:489 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:153 [inline] do_idle+0x49b/0x5c0 kernel/sched/idle.c:262 cpu_startup_entry+0x10c/0x120 kernel/sched/idle.c:368 start_secondary+0x487/0x5f0 arch/x86/kernel/smpboot.c:271 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243