rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (10500 ticks this GP) idle=516/1/0x4000000000000004 softirq=456097/456097 fqs=11
rcu: (t=10500 jiffies g=540857 q=486)
rcu: rcu_preempt kthread starved for 10468 jiffies! g540857 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29424 10 2 0x80000000
Call Trace:
context_switch kernel/sched/core.c:2826 [inline]
__schedule+0x866/0x1dc0 kernel/sched/core.c:3515
schedule+0x92/0x1c0 kernel/sched/core.c:3559
schedule_timeout+0x4db/0xfc0 kernel/time/timer.c:1806
rcu_gp_kthread+0xd5c/0x2190 kernel/rcu/tree.c:2202
kthread+0x354/0x420 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 8381 Comm: syz-executor.0 Not tainted 4.19.102-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+0x197/0x210 lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b0/0x1f8 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:164 [inline]
rcu_dump_cpu_stacks+0x189/0x1d5 kernel/rcu/tree.c:1340
print_cpu_stall kernel/rcu/tree.c:1478 [inline]
check_cpu_stall kernel/rcu/tree.c:1550 [inline]
__rcu_pending kernel/rcu/tree.c:3293 [inline]
rcu_pending kernel/rcu/tree.c:3336 [inline]
rcu_check_callbacks.cold+0x5e3/0xd90 kernel/rcu/tree.c:2682
update_process_times+0x32/0x80 kernel/time/timer.c:1638
tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:168
tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1278
__run_hrtimer kernel/time/hrtimer.c:1401 [inline]
__hrtimer_run_queues+0x33b/0xdc0 kernel/time/hrtimer.c:1463
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1521
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184
Code: 48 c7 c0 48 57 f2 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d 7a 4c 9d 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 3c c4 f3 f9 65 8b 05 e5 e2 ac 78
RSP: 0018:ffff8880ae907bc8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11e4ae9 RBX: 0000000000000286 RCX: 1ffff1100bce4936
RDX: dffffc0000000000 RSI: ffff88805e724990 RDI: 0000000000000286
RBP: ffff8880ae907bd8 R08: ffff88805e7240c0 R09: ffff88805e7249b0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae923a00
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880ae923a00
__mod_timer kernel/time/timer.c:1059 [inline]
mod_timer+0x571/0x1030 kernel/time/timer.c:1102
garp_join_timer_arm+0x5e/0x80 net/802/garp.c:401
garp_join_timer+0x73/0x80 net/802/garp.c:414
call_timer_fn+0x18d/0x720 kernel/time/timer.c:1326
expire_timers kernel/time/timer.c:1363 [inline]
__run_timers kernel/time/timer.c:1684 [inline]
__run_timers kernel/time/timer.c:1652 [inline]
run_timer_softirq+0x64f/0x16a0 kernel/time/timer.c:1697
__do_softirq+0x25c/0x921 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x180/0x1d0 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:536 [inline]
smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:893
RIP: 0010:write_comp_data+0x68/0x70 kernel/kcov.c:146
Code: 00 00 4e 8d 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 0f 1f 80 00 00 00 00 55 40 0f b6 d6 40 0f b6 f7 31 ff 48 89 e5
RSP: 0018:ffff888214ad7550 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000002 RBX: 0000000000000200 RCX: ffffffff81bacfdb
RDX: 0000000000000200 RSI: 0000000000000000 RDI: 0000000000000007
RBP: ffff888214ad7558 R08: ffff88805e7240c0 R09: 0000000000000000
R10: ffffed10125e5e8a R11: ffff888092f2f453 R12: dffffc0000000000
R13: 0000000000000433 R14: ffff888214ad7778 R15: 0000000000000010
check_irqs_on fs/buffer.c:1218 [inline]
lookup_bh_lru fs/buffer.c:1259 [inline]
__find_get_block+0x6b/0xdf0 fs/buffer.c:1291
sb_find_get_block include/linux/buffer_head.h:338 [inline]
recently_deleted fs/ext4/ialloc.c:682 [inline]
find_inode_bit.isra.0+0x202/0x510 fs/ext4/ialloc.c:722
__ext4_new_inode+0x14b0/0x52d0 fs/ext4/ialloc.c:914
ext4_create+0x236/0x5e0 fs/ext4/namei.c:2469
lookup_open+0x12be/0x1ad0 fs/namei.c:3235
do_last fs/namei.c:3327 [inline]
path_openat+0x1490/0x44a0 fs/namei.c:3537
do_filp_open+0x1a1/0x280 fs/namei.c:3567
do_sys_open+0x3fe/0x550 fs/open.c:1088
ksys_open include/linux/syscalls.h:1276 [inline]
__do_sys_creat fs/open.c:1146 [inline]
__se_sys_creat fs/open.c:1144 [inline]
__x64_sys_creat+0x61/0x80 fs/open.c:1144
do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b399
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4b69a02c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 00007f4b69a036d4 RCX: 000000000045b399
RDX: 0000000000000000 RSI: 0000000000000090 RDI: 00000000200003c0
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000094 R14: 00000000004c1e0d R15: 000000000075bf2c