rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P19916
	(detected by 1, t=10502 jiffies, g=42829, q=250)
task:syz-executor132 state:R  running task     stack:28136 pid:19916 ppid:  6893 flags:0x00004006
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:6453 [inline]
 sched_show_task+0x434/0x580 kernel/sched/core.c:6428
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:228 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:502 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:640 [inline]
 rcu_pending kernel/rcu/tree.c:3704 [inline]
 rcu_sched_clock_irq.cold+0xd90/0xdcf kernel/rcu/tree.c:2575
 update_process_times+0x25/0xa0 kernel/time/timer.c:1710
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
 tick_sched_timer+0x1d1/0x2a0 kernel/time/tick-sched.c:1328
 __run_hrtimer kernel/time/hrtimer.c:1524 [inline]
 __hrtimer_run_queues+0x1ce/0xea0 kernel/time/hrtimer.c:1588
 hrtimer_interrupt+0x334/0x940 kernel/time/hrtimer.c:1650
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:786
 </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+0xb2/0xf0 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631
RIP: 0010:write_comp_data+0x78/0x80 kernel/kcov.c:242
Code: 00 00 4e 8d 0c dd 28 00 00 00 4c 39 ce 72 1b 49 83 c0 01 4a 89 7c 08 e0 4e 89 54 08 e8 4a 89 54 08 f0 4a 89 4c d8 20 4c 89 00 <c3> 0f 1f 80 00 00 00 00 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff
RSP: 0018:ffffc900065df9b0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff82db95eb
RDX: 0000000000000000 RSI: ffff888094a521c0 RDI: 0000000000000005
RBP: ffff88808acf5a18 R08: 0000000000000001 R09: ffff88808acf58ab
R10: 0000000000000000 R11: 0000000000000004 R12: ffff88808acf5800
R13: 0000000000000000 R14: 000000000000000a R15: ffff88808acf5a20
 afs_lookup_cell_rcu+0x35b/0x720 fs/afs/cell.c:90
 afs_lookup_cell+0x2e6/0x1450 fs/afs/cell.c:249
 afs_parse_source fs/afs/super.c:290 [inline]
 afs_parse_param+0x404/0x8c0 fs/afs/super.c:326
 vfs_parse_fs_param fs/fs_context.c:117 [inline]
 vfs_parse_fs_param+0x203/0x550 fs/fs_context.c:98
 vfs_parse_fs_string+0xe6/0x150 fs/fs_context.c:161
 generic_parse_monolithic+0x16f/0x1f0 fs/fs_context.c:201
 do_new_mount fs/namespace.c:2892 [inline]
 path_mount+0x1266/0x1e70 fs/namespace.c:3227
 do_mount fs/namespace.c:3240 [inline]
 __do_sys_mount fs/namespace.c:3448 [inline]
 __se_sys_mount fs/namespace.c:3425 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3425
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x448e7a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad a2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a a2 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007ffec11f87f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffec11f8840 RCX: 0000000000448e7a
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007ffec11f8840 R09: 0000000000000004
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00000000000e5e9e R14: 00000000006d4da8 R15: 00000000006d5420