rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10500 ticks this GP) idle=08a/1/0x4000000000000000 softirq=220356/220356 fqs=0
(t=10501 jiffies g=400437 q=109)
rcu: rcu_preempt kthread starved for 10502 jiffies! g400437 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:
rcu_preempt R running task 29352 10 2 0x00004000
Call Trace:
context_switch kernel/sched/core.c:3453 [inline]
__schedule+0x8e1/0x1eb0 kernel/sched/core.c:4178
schedule+0xd0/0x2a0 kernel/sched/core.c:4253
schedule_timeout+0x148/0x250 kernel/time/timer.c:1897
rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
NMI backtrace for cpu 1
CPU: 1 PID: 17079 Comm: syz-executor.4 Not tainted 5.8.0-rc5-syzkaller #0
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+0x18f/0x20d lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:320
print_cpu_stall kernel/rcu/tree_stall.h:553 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
rcu_pending kernel/rcu/tree.c:3489 [inline]
rcu_sched_clock_irq.cold+0x5b3/0xccc kernel/rcu/tree.c:2504
update_process_times+0x25/0x60 kernel/time/timer.c:1726
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
tick_sched_timer+0x108/0x290 kernel/time/tick-sched.c:1320
__run_hrtimer kernel/time/hrtimer.c:1520 [inline]
__hrtimer_run_queues+0x1d5/0xfc0 kernel/time/hrtimer.c:1584
hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
__sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline]
sysvec_apic_timer_interrupt+0x4f/0x120 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:765 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 80 e0 b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d 3b 96 cc 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 35 28 67 f9 65 8b 05 5e b4 19 78
RSP: 0018:ffffc90000da8c50 EFLAGS: 00000282
RAX: 1ffffffff1369c10 RBX: 0000000000000282 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: ffff8880ae7255c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880ae7255c0
R13: 0000000100032979 R14: 000000010003298e R15: 0000000000000000
__mod_timer+0x669/0xf40 kernel/time/timer.c:1057
call_timer_fn+0x1ac/0x760 kernel/time/timer.c:1404
expire_timers kernel/time/timer.c:1449 [inline]
__run_timers.part.0+0x54c/0xa20 kernel/time/timer.c:1773
__run_timers kernel/time/timer.c:1745 [inline]
run_timer_softirq+0xae/0x1a0 kernel/time/timer.c:1786
__do_softirq+0x34c/0xa60 kernel/softirq.c:292
asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
__run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
do_softirq_own_stack+0x111/0x170 arch/x86/kernel/irq_64.c:77
invoke_softirq kernel/softirq.c:387 [inline]
__irq_exit_rcu kernel/softirq.c:417 [inline]
irq_exit_rcu+0x229/0x270 kernel/softirq.c:429
sysvec_apic_timer_interrupt+0x54/0x120 arch/x86/kernel/apic/apic.c:1091
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:587
RIP: 0010:__kernel_text_address+0x24/0x30 kernel/extable.c:106
Code: 84 00 00 00 00 00 53 48 89 fb e8 07 ff ff ff 85 c0 75 17 48 81 fb 00 20 bb 8b 72 0c 31 c0 48 81 fb 66 d0 cf 8b 0f 92 c0 5b c3 01 00 00 00 5b c3 0f 1f 44 00 00 48 81 ff 00 00 00 81 55 48 89
RSP: 0018:ffffc90017117780 EFLAGS: 00000202
RAX: 0000000000000001 RBX: ffffffff81b2f1cb RCX: 0000000000000000
RDX: 1ffff92002e22efe RSI: 0000000000000001 RDI: ffffffff81b2f1cb
RBP: ffffc900171177f0 R08: ffffffff8b1bb2c6 R09: ffffffff8b1bb2ca
R10: 000000000007201e R11: 0000000000000001 R12: ffffc90017117860
R13: 0000000000000000 R14: ffff8880120da500 R15: 0000000000000020
unwind_get_return_address arch/x86/kernel/unwind_orc.c:317 [inline]
unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:312
arch_stack_walk+0x97/0xf0 arch/x86/kernel/stacktrace.c:26
stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:123
save_stack+0x1b/0x40 mm/kasan/common.c:48
set_track mm/kasan/common.c:56 [inline]
__kasan_kmalloc.constprop.0+0xc2/0xd0 mm/kasan/common.c:494
slab_post_alloc_hook mm/slab.h:586 [inline]
slab_alloc mm/slab.c:3320 [inline]
__do_kmalloc mm/slab.c:3654 [inline]
__kmalloc+0x164/0x340 mm/slab.c:3665
kmalloc include/linux/slab.h:560 [inline]
kzalloc include/linux/slab.h:669 [inline]
tomoyo_encode2.part.0+0xe9/0x3a0 security/tomoyo/realpath.c:45
tomoyo_encode2 security/tomoyo/realpath.c:31 [inline]
tomoyo_encode+0x28/0x50 security/tomoyo/realpath.c:80
tomoyo_realpath_from_path+0x186/0x620 security/tomoyo/realpath.c:288
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_number_perm+0x1cb/0x4d0 security/tomoyo/file.c:723
security_file_ioctl+0x50/0xb0 security/security.c:1480
ksys_ioctl+0x50/0x180 fs/ioctl.c:747
__do_sys_ioctl fs/ioctl.c:762 [inline]
__se_sys_ioctl fs/ioctl.c:760 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:760
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c1d9
Code: Bad RIP value.
RSP: 002b:00007f8193203c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000001c480 RCX: 000000000045c1d9
RDX: 0000000020000080 RSI: 000000000000890c RDI: 0000000000000004
RBP: 000000000078bf40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 0000000000c9fb6f R14: 00007f81932049c0 R15: 000000000078bf0c