rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P20735
	(detected by 0, t=10502 jiffies, g=51489, q=597)
syz-executor.0  R  running task    28056 20735   9792 0x00004006
Call Trace:
 <IRQ>
 sched_show_task kernel/sched/core.c:5954 [inline]
 sched_show_task.cold+0x2ee/0x35d kernel/sched/core.c:5929
 rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:190 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:418 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:558 [inline]
 rcu_pending kernel/rcu/tree.c:3030 [inline]
 rcu_sched_clock_irq.cold+0xbf6/0xc37 kernel/rcu/tree.c:2276
 update_process_times+0x2d/0x70 kernel/time/timer.c:1726
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:171
 tick_sched_timer+0x53/0x140 kernel/time/tick-sched.c:1314
 __run_hrtimer kernel/time/hrtimer.c:1517 [inline]
 __hrtimer_run_queues+0x364/0xe40 kernel/time/hrtimer.c:1579
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1641
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1119 [inline]
 smp_apic_timer_interrupt+0x160/0x610 arch/x86/kernel/apic/apic.c:1144
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829
 </IRQ>
RIP: 0010:afs_lookup_cell_rcu+0x34d/0x920 fs/afs/cell.c:89
Code: 86 39 01 00 00 48 89 85 68 ff ff ff e8 bc 53 b1 fe 48 8b 85 70 ff ff ff 48 b9 00 00 00 00 00 fc ff df 48 c1 e8 03 0f b6 04 08 <84> c0 74 06 0f 8e 11 05 00 00 41 0f b6 96 38 01 00 00 48 8b 85 48
RSP: 0018:ffffc90001e679e0 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000040000 RSI: ffffffff82c43a44 RDI: 0000000000000005
RBP: ffffc90001e67ab8 R08: ffff88804d8d0100 R09: ffffed1014565113
R10: ffffed1014565112 R11: ffff8880a2b28893 R12: ffff8880a2b28890
R13: 0000000000000000 R14: ffff8880a2b28800 R15: ffffc90001e67a90
 afs_lookup_cell+0x323/0x1330 fs/afs/cell.c:237
 afs_parse_source fs/afs/super.c:290 [inline]
 afs_parse_param fs/afs/super.c:326 [inline]
 afs_parse_param+0x440/0x920 fs/afs/super.c:314
 vfs_parse_fs_param+0x2b4/0x610 fs/fs_context.c:147
 vfs_parse_fs_string+0x10a/0x170 fs/fs_context.c:191
 do_new_mount fs/namespace.c:2816 [inline]
 do_mount+0x6b4/0x1b50 fs/namespace.c:3107
 __do_sys_mount fs/namespace.c:3316 [inline]
 __se_sys_mount fs/namespace.c:3293 [inline]
 __x64_sys_mount+0x192/0x230 fs/namespace.c:3293
 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c6c9
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:00007f62327cfc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f62327d06d4 RCX: 000000000045c6c9
RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 00000000200001c0
RBP: 000000000076bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000745 R14: 00000000004c9f6e R15: 000000000076bf2c