BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 121s!
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 121s!
BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 stuck for 120s!
Showing busy workqueues and worker pools:
workqueue events: flags=0x0
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=4/256
    pending: cache_reap, defense_work_handler, defense_work_handler, defense_work_handler
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=9/256
    pending: defense_work_handler, vmstat_shepherd, cache_reap, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, check_corruption
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256
    pending: neigh_periodic_work, do_cache_clean
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=3/256
    pending: gc_worker, neigh_periodic_work, check_lifetime
workqueue mm_percpu_wq: flags=0x8
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue writeback: flags=0x4e
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=9/256
    pending: wb_workfn, wb_workfn, wb_workfn, wb_workfn, wb_workfn, wb_workfn, wb_workfn, wb_workfn, wb_workfn
workqueue kblockd: flags=0x18
  pwq 1: cpus=0 node=0 flags=0x0 nice=-20 active=1/256
    pending: blk_mq_timeout_work
workqueue ib_addr: flags=0xa0002
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1
    pending: process_req
workqueue dm_bufio_cache: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: work_fn
workqueue ipv6_addrconf: flags=0x40008
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/1
    pending: addrconf_verify_work
INFO: rcu_sched self-detected stall on CPU
INFO: rcu_sched detected stalls on CPUs/tasks:
	0-...!: (124823 ticks this GP) idle=e76/1/4611686018427387906 softirq=36469/36469 fqs=1 
	
	0-...!: (124823 ticks this GP) idle=e76/1/4611686018427387906 softirq=36469/36469 fqs=1 
	
 (t=125002 jiffies g=19272 c=19271 q=179)
(detected by 1, t=125002 jiffies, g=19272, c=19271, q=179)
rcu_sched kthread starved for 124998 jiffies! g19272 c19271 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
Sending NMI from CPU 1 to CPUs 0:
RCU grace-period kthread stack dump:
NMI backtrace for cpu 0
CPU: 0 PID: 8315 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__sanitizer_cov_trace_pc+0x1/0x50 kernel/kcov.c:94
RSP: 0018:ffff8801dae06c38 EFLAGS: 00000002
RAX: ffff8801c7c3a780 RBX: ffffffffffffffff RCX: ffffffff876c4433
RDX: 0000000000010000 RSI: ffffffff876c43b7 RDI: 0000000000000005
RBP: ffff8801dae06d68 R08: ffff8801c7c3a780 R09: fffffbfff14da0bc
R10: fffffbfff14da0bc R11: ffffffff8a6d05e0 R12: ffffffff8a6d05e5
R13: ffff8801dae06d00 R14: 0000000000000000 R15: ffffffff8a6d05e3
FS:  0000000000ced940(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000930008 CR3: 0000000195bf4000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000020000000
DR3: 0000000020000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 vsnprintf+0x13a5/0x1b40 lib/vsprintf.c:2358
 sprintf+0xa7/0xd0 lib/vsprintf.c:2494
 print_time kernel/printk/printk.c:1223 [inline]
 print_prefix+0x26a/0x3f0 kernel/printk/printk.c:1246
 msg_print_text+0xca/0x1c0 kernel/printk/printk.c:1273
 console_unlock+0x4f5/0x1100 kernel/printk/printk.c:2369
 vprintk_emit+0x6ad/0xdd0 kernel/printk/printk.c:1907
 vprintk_default+0x28/0x30 kernel/printk/printk.c:1947
 vprintk_func+0x7a/0xe7 kernel/printk/printk_safe.c:379
 printk+0x9e/0xba kernel/printk/printk.c:1980
 rcu_check_gp_kthread_starvation+0x325/0x3a4 kernel/rcu/tree.c:1353
 print_cpu_stall kernel/rcu/tree.c:1523 [inline]
 check_cpu_stall.isra.61.cold.80+0x364/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923
RSP: 0018:ffff8801c944f8d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff10039289f20 RCX: 0000000000000000
RDX: 1ffffffff11a316d RSI: ffff8801c7c3afb8 RDI: 0000000000000286
RBP: ffff8801c944f9c8 R08: 00000000000077c8 R09: 0000000000000004
R10: ffff8801c7c3b058 R11: ffff8801c7c3a780 R12: ffff8801c7c3a780
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354
 d_walk+0x3ad/0xc80 fs/dcache.c:1274
 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486
 vfs_rmdir+0x202/0x470 fs/namei.c:3850
 do_rmdir+0x523/0x610 fs/namei.c:3911
 __do_sys_rmdir fs/namei.c:3929 [inline]
 __se_sys_rmdir fs/namei.c:3927 [inline]
 __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4556e7
RSP: 002b:00007ffc02de4558 EFLAGS: 00000202 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004556e7
RDX: 0000000000000000 RSI: 00007ffc02de6300 RDI: 00007ffc02de6300
RBP: 00007ffc02de6300 R08: 0000000000000000 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000202 R12: 0000000000cee940
R13: 0000000000000000 R14: 00000000000000b4 R15: 000000000001e9ba
Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 <65> 48 8b 04 25 c0 ed 01 00 65 8b 15 9f bd 88 7e 48 89 e5 81 e2 
rcu_sched kthread starved for 124998 jiffies! g19272 c19271 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
rcu_sched       R
RCU grace-period kthread stack dump:
rcu_sched       R
  running task    23592     9      2 0x80000000
  running task    
Call Trace:
 context_switch kernel/sched/core.c:2848 [inline]
 __schedule+0x801/0x1e30 kernel/sched/core.c:3490
23592     9      2 0x80000000
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
 schedule+0xef/0x430 kernel/sched/core.c:3549
 schedule_timeout+0x138/0x240 kernel/time/timer.c:1801
 schedule_timeout+0x138/0x240 kernel/time/timer.c:1801
 rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231
 rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231
 kthread+0x345/0x410 kernel/kthread.c:238
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
 kthread+0x345/0x410 kernel/kthread.c:238
NMI backtrace for cpu 0
CPU: 0 PID: 8315 Comm: syz-executor1 Not tainted 4.17.0-rc3+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Call Trace:
 <IRQ>
 __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_single_cpu_backtrace include/linux/nmi.h:156 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1376
 print_cpu_stall kernel/rcu/tree.c:1525 [inline]
 check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593
 __rcu_pending kernel/rcu/tree.c:3356 [inline]
 rcu_pending kernel/rcu/tree.c:3401 [inline]
 rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline]
 smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:lock_acquire+0x257/0x520 kernel/locking/lockdep.c:3923
RSP: 0018:ffff8801c944f8d8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: dffffc0000000000 RBX: 1ffff10039289f20 RCX: 0000000000000000
RDX: 1ffffffff11a316d RSI: ffff8801c7c3afb8 RDI: 0000000000000286
RBP: ffff8801c944f9c8 R08: 00000000000077c8 R09: 0000000000000004
R10: ffff8801c7c3b058 R11: ffff8801c7c3a780 R12: ffff8801c7c3a780
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 _raw_spin_lock_nested+0x28/0x40 kernel/locking/spinlock.c:354
 d_walk+0x3ad/0xc80 fs/dcache.c:1274
 shrink_dcache_parent+0x179/0x230 fs/dcache.c:1486
 vfs_rmdir+0x202/0x470 fs/namei.c:3850
 do_rmdir+0x523/0x610 fs/namei.c:3911
 __do_sys_rmdir fs/namei.c:3929 [inline]
 __se_sys_rmdir fs/namei.c:3927 [inline]
 __x64_sys_rmdir+0x36/0x40 fs/namei.c:3927
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4556e7
RSP: 002b:00007ffc02de4558 EFLAGS: 00000202 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004556e7
RDX: 0000000000000000 RSI: 00007ffc02de6300 RDI: 00007ffc02de6300
RBP: 00007ffc02de6300 R08: 0000000000000000 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000202 R12: 0000000000cee940
R13: 0000000000000000 R14: 00000000000000b4 R15: 000000000001e9ba
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.362 msecs