rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 0-...!: (10431 ticks this GP) idle=8ba/1/0x4000000000000000 softirq=31451/31453 fqs=139
(t=10502 jiffies g=46981 q=890)
rcu: rcu_preempt kthread starved for 7422 jiffies! g46981 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:28880 pid: 13 ppid: 2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:4313 [inline]
__schedule+0x90c/0x21a0 kernel/sched/core.c:5064
schedule+0xcf/0x270 kernel/sched/core.c:5143
schedule_timeout+0x148/0x250 kernel/time/timer.c:1878
rcu_gp_fqs_loop kernel/rcu/tree.c:1940 [inline]
rcu_gp_kthread+0xbbe/0x1d70 kernel/rcu/tree.c:2113
kthread+0x3b1/0x4a0 kernel/kthread.c:292
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
NMI backtrace for cpu 0
CPU: 0 PID: 16795 Comm: syz-executor.5 Not tainted 5.11.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x107/0x163 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105
nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x1e3/0x21e kernel/rcu/tree_stall.h:337
print_cpu_stall kernel/rcu/tree_stall.h:569 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:643 [inline]
rcu_pending kernel/rcu/tree.c:3751 [inline]
rcu_sched_clock_irq.cold+0x472/0xec3 kernel/rcu/tree.c:2580
update_process_times+0x16d/0x200 kernel/time/timer.c:1782
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1369
__run_hrtimer kernel/time/hrtimer.c:1519 [inline]
__hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1583
hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1645
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1085 [inline]
__sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1102
run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:91 [inline]
sysvec_apic_timer_interrupt+0x48/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:30 [inline]
RIP: 0010:__orc_find+0x6f/0xf0 arch/x86/kernel/unwind_orc.c:52
Code: 72 4d 4c 89 e0 48 29 e8 48 89 c2 48 c1 e8 3f 48 c1 fa 02 48 01 d0 48 d1 f8 48 8d 5c 85 00 48 89 d8 48 c1 e8 03 42 0f b6 14 38 <48> 89 d8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 48 48 63 03 48 01
RSP: 0018:ffffc900000073e8 EFLAGS: 00000212
RAX: 1ffffffff1a376a8 RBX: ffffffff8d1bb540 RCX: ffffffff83c02d9b
RDX: 0000000000000000 RSI: ffffffff8d95d348 RDI: ffffffff8d1bb540
RBP: ffffffff8d1bb540 R08: ffffffff8d95d34e R09: ffffffff8d95d348
R10: 0000000000082083 R11: 000000000008d224 R12: ffffffff8d1bb540
R13: ffffffff8d1bb540 R14: ffffffff8d1bb540 R15: dffffc0000000000
orc_find arch/x86/kernel/unwind_orc.c:173 [inline]
unwind_next_frame+0x342/0x1f90 arch/x86/kernel/unwind_orc.c:443
arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121
kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:401 [inline]
____kasan_kmalloc.constprop.0+0x82/0xa0 mm/kasan/common.c:429
kmalloc include/linux/slab.h:557 [inline]
kzalloc include/linux/slab.h:682 [inline]
neigh_alloc net/core/neighbour.c:401 [inline]
___neigh_create+0x12a4/0x2540 net/core/neighbour.c:579
ip6_finish_output2+0xdf8/0x16c0 net/ipv6/ip6_output.c:114
__ip6_finish_output net/ipv6/ip6_output.c:143 [inline]
__ip6_finish_output+0x447/0xab0 net/ipv6/ip6_output.c:128
ip6_finish_output+0x34/0x1f0 net/ipv6/ip6_output.c:153
NF_HOOK_COND include/linux/netfilter.h:290 [inline]
ip6_output+0x1db/0x520 net/ipv6/ip6_output.c:176
dst_output include/net/dst.h:441 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ndisc_send_skb+0xa69/0x1720 net/ipv6/ndisc.c:508
ndisc_send_rs+0x12e/0x700 net/ipv6/ndisc.c:702
addrconf_rs_timer+0x3f2/0x820 net/ipv6/addrconf.c:3874
call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1417
expire_timers kernel/time/timer.c:1462 [inline]
__run_timers.part.0+0x67c/0xa50 kernel/time/timer.c:1731
__run_timers kernel/time/timer.c:1712 [inline]
run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1744
__do_softirq+0x2a5/0x9f7 kernel/softirq.c:343
asm_call_irq_on_stack+0xf/0x20
__run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
do_softirq_own_stack+0xaa/0xd0 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:226 [inline]
__irq_exit_rcu kernel/softirq.c:420 [inline]
irq_exit_rcu+0x134/0x200 kernel/softirq.c:432
sysvec_apic_timer_interrupt+0x4d/0x100 arch/x86/kernel/apic/apic.c:1096
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:628
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191
Code: f8 5d c3 66 90 55 48 89 fd 48 83 c7 18 53 48 89 f3 48 8b 74 24 10 e8 9a 7c 6a f8 48 89 ef e8 22 31 6b f8 f6 c7 02 75 1a 53 9d 01 00 00 00 e8 11 41 5f f8 65 8b 05 3a e6 13 77 85 c0 74 0a 5b
RSP: 0018:ffffc9000330f668 EFLAGS: 00000216
RAX: 000000000419c37d RBX: 0000000000000216 RCX: ffffffff81580a37
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000000
RBP: ffffffff8f116d90 R08: 0000000000000001 R09: ffffffff8ebda7a7
R10: fffffbfff1d7b4f4 R11: 0000000000000000 R12: 1ffffffff1e22db1
R13: 0000000000000000 R14: dead000000000100 R15: dffffc0000000000
__debug_check_no_obj_freed lib/debugobjects.c:997 [inline]
debug_check_no_obj_freed+0x20c/0x420 lib/debugobjects.c:1018
free_pages_prepare mm/page_alloc.c:1274 [inline]
free_pcp_prepare+0x297/0x400 mm/page_alloc.c:1304
free_unref_page_prepare mm/page_alloc.c:3197 [inline]
free_unref_page+0x12/0x1b0 mm/page_alloc.c:3245
kasan_depopulate_vmalloc_pte+0x5c/0x70 mm/kasan/shadow.c:346
apply_to_pte_range mm/memory.c:2408 [inline]
apply_to_pmd_range mm/memory.c:2444 [inline]
apply_to_pud_range mm/memory.c:2472 [inline]
apply_to_p4d_range mm/memory.c:2500 [inline]
__apply_to_page_range+0x645/0xdf0 mm/memory.c:2527
kasan_release_vmalloc+0xa7/0xc0 mm/kasan/shadow.c:456
__purge_vmap_area_lazy+0x8f9/0x1c50 mm/vmalloc.c:1381
try_purge_vmap_area_lazy mm/vmalloc.c:1400 [inline]
free_vmap_area_noflush+0xa57/0xd00 mm/vmalloc.c:1442
free_unmap_vmap_area mm/vmalloc.c:1455 [inline]
remove_vm_area+0x1ca/0x230 mm/vmalloc.c:2188
vm_remove_mappings mm/vmalloc.c:2215 [inline]
__vunmap+0x392/0xb50 mm/vmalloc.c:2277
__vfree+0x3c/0xd0 mm/vmalloc.c:2333
vfree+0x5a/0x90 mm/vmalloc.c:2364
kcov_put kernel/kcov.c:408 [inline]
kcov_put+0x26/0x40 kernel/kcov.c:404
kcov_close+0xc/0x10 kernel/kcov.c:510
__fput+0x283/0x920 fs/file_table.c:280
task_work_run+0xdd/0x190 kernel/task_work.c:140
exit_task_work include/linux/task_work.h:30 [inline]
do_exit+0xc5c/0x2ae0 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x3ec/0x2010 kernel/signal.c:2770
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:201
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x46107a
Code: Unable to access opcode bytes at RIP 0x461050.
RSP: 002b:00007fb733ae1c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4
RAX: 0000000000000000 RBX: 00000000004cc86a RCX: 000000000046107a
RDX: 00000000004ffba0 RSI: 00007fb733ae1c50 RDI: 0000000000000001
RBP: 000000000119bf80 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c
R13: 00007fffdc8ec7ef R14: 00007fb733ae29c0 R15: 000000000119bf8c