overlayfs: missing 'lowerdir'
gfs2: gfs2 mount does not exist
“‘hMþ=ôå=²¨: renamed from lo
overlayfs: missing 'lowerdir'
BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 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=10/256
    pending: defense_work_handler, defense_work_handler, cache_reap, defense_work_handler, perf_sched_delayed, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=8/256
    in-flight: 5563:bpf_map_free_deferred, 4923:bpf_map_free_deferred, 24:bpf_map_free_deferred
    pending: vmstat_shepherd, cache_reap, defense_work_handler, defense_work_handler, check_corruption
workqueue events_unbound: flags=0x2
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/512
    in-flight: 40:call_usermodehelper_exec_work
workqueue events_power_efficient: flags=0x80
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=4/256
    pending: gc_worker, neigh_periodic_work, neigh_periodic_work, check_lifetime
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
    pending: do_cache_clean
workqueue mm_percpu_wq: flags=0x8
  pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
  pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256
    pending: vmstat_update
workqueue netns: flags=0xe000a
  pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1
    in-flight: 5754:cleanup_net
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 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256
    pending: blk_mq_timeout_work
workqueue dm_bufio_cache: flags=0x8
  pwq 0: cpus=0 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
pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=120s workers=6 idle: 1980 4 4855
pool 4: cpus=0-1 flags=0x4 nice=0 hung=120s workers=8 idle: 1863 527 5986 73 22 6
INFO: rcu_sched self-detected stall on CPU
	1-...!: (124998 ticks this GP) idle=bba/1/4611686018427387906 softirq=44138/44138 fqs=16 
	 (t=125000 jiffies g=16162 c=16161 q=312)
rcu_sched kthread starved for 124932 jiffies! g16162 c16161 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
RCU grace-period kthread stack dump:
rcu_sched       R  running task    23896     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_timeout+0x138/0x240 kernel/time/timer.c:1801
 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
NMI backtrace for cpu 1
CPU: 1 PID: 4601 Comm: syz-executor5 Not tainted 4.17.0-rc2+ #23
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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:173
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1283
 __run_hrtimer kernel/time/hrtimer.c:1386 [inline]
 __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1448
 hrtimer_interrupt+0x286/0x650 kernel/time/hrtimer.c:1506
 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:seqcount_lockdep_reader_access include/linux/seqlock.h:83 [inline]
RIP: 0010:read_seqcount_begin include/linux/seqlock.h:164 [inline]
RIP: 0010:read_seqbegin include/linux/seqlock.h:433 [inline]
RIP: 0010:read_seqbegin_or_lock include/linux/seqlock.h:529 [inline]
RIP: 0010:d_walk+0x840/0xc80 fs/dcache.c:1248
RSP: 0018:ffff88019e27f9f8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff88019e200440 RBX: 0000000000000293 RCX: 1ffff10033c4019d
RDX: 0000000000000000 RSI: ffffffff81c63a6b RDI: 0000000000000293
RBP: ffff88019e27fb78 R08: ffff88019e200c78 R09: 0000000000000006
R10: ffff88019e200440 R11: 0000000000000000 R12: 0000000000000200
R13: dffffc0000000000 R14: 1ffff10033c4ff82 R15: ffff88019e27fb50
 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:00007fff472251a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 0000000000000065 RCX: 00000000004556e7
RDX: 0000000000000000 RSI: 00007fff47226f50 RDI: 00007fff47226f50
RBP: 00007fff47226f50 R08: 0000000000000000 R09: 0000000000000001
R10: 000000000000000a R11: 0000000000000202 R12: 0000000001b9a940
R13: 0000000000000000 R14: 0000000000000132 R15: 000000000001edfa