rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-...!: (1 ticks this GP) idle=246/1/0x4000000000000000 softirq=36057/36057 fqs=0 
	(detected by 1, t=10502 jiffies, g=61537, q=2621)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3904 Comm: systemd-udevd Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197
Code: 5d be 03 00 00 00 e9 66 e0 23 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 00 ff 01 00 <65> 8b 05 e0 41 8e 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74
RSP: 0018:ffffc90000007de0 EFLAGS: 00000093
RAX: 0000000000010000 RBX: 0000000000000000 RCX: ffffffff81640a80
RDX: ffff88809f83e4c0 RSI: ffff88809f83e4c0 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000001 R09: ffff88809f83ed88
R10: 000000000000003f R11: 0000000000000000 R12: ffff8880ae627740
R13: ffff8880ae6278c0 R14: ffff8880a330d340 R15: dffffc0000000000
FS:  00007f56f99378c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055caaf91e00f CR3: 00000000a071b000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 cpumask_test_cpu include/linux/cpumask.h:367 [inline]
 trace_hrtimer_expire_exit include/trace/events/timer.h:279 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1523 [inline]
 __hrtimer_run_queues+0x20e/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
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __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]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data+0xa/0x80 kernel/kcov.c:217
Code: 65 48 8b 04 25 00 ff 01 00 48 8b 80 f8 13 00 00 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 49 89 f2 65 8b 05 a6 46 8e 7e <65> 48 8b 34 25 00 ff 01 00 a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b
RSP: 0018:ffffc900016079e0 EFLAGS: 00000246
RAX: 0000000080000000 RBX: 0000000000000000 RCX: ffffffff8354f704
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: ffff8880a43e0980 R08: 0000000000000001 R09: ffffffff89cd8387
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8880a43e0980 R14: 0000000000000001 R15: 2f6c617574726976
 security_inode_permission+0x54/0xf0 security/security.c:1256
 inode_permission.part.0+0x113/0x410 fs/namei.c:471
 inode_permission fs/namei.c:444 [inline]
 may_lookup fs/namei.c:1575 [inline]
 link_path_walk.part.0+0x7a9/0xc20 fs/namei.c:2125
 link_path_walk fs/namei.c:2111 [inline]
 path_lookupat+0xb7/0x830 fs/namei.c:2332
 filename_lookup+0x19f/0x560 fs/namei.c:2366
 user_path_at include/linux/namei.h:59 [inline]
 vfs_statx+0x14e/0x390 fs/stat.c:202
 vfs_lstat include/linux/fs.h:3302 [inline]
 __do_sys_newlstat+0x91/0x110 fs/stat.c:374
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f56f87aa335
Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89
RSP: 002b:00007ffd10874298 EFLAGS: 00000246 ORIG_RAX: 0000000000000006
RAX: ffffffffffffffda RBX: 000055caaf8f5860 RCX: 00007f56f87aa335
RDX: 00007ffd108742d0 RSI: 00007ffd108742d0 RDI: 000055caaf8f4860
RBP: 00007ffd10874390 R08: 00007f56f8a691e8 R09: 0000000000001010
R10: 0000000000000020 R11: 0000000000000246 R12: 000055caaf8f4860
R13: 000055caaf8f4880 R14: 000055caaf9064fb R15: 000055caaf906500
rcu: rcu_preempt kthread starved for 10502 jiffies! g61537 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29640    10      2 0x00004000
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_timeout+0x148/0x250 kernel/time/timer.c:1908
 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