rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P12011/1:b..l
	(detected by 0, t=10503 jiffies, g=13233, q=232237)
task:syz-executor436 state:R  running task     stack:27736 pid:12011 ppid:  6890 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:3777 [inline]
 __schedule+0xec5/0x2200 kernel/sched/core.c:4526
 preempt_schedule_irq+0xbf/0x1b0 kernel/sched/core.c:4787
 irqentry_exit_cond_resched kernel/entry/common.c:358 [inline]
 irqentry_exit_cond_resched kernel/entry/common.c:350 [inline]
 irqentry_exit+0x65/0x90 kernel/entry/common.c:388
 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:ffffc9000aeb7a50 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff82db926b
RDX: 0000000000000000 RSI: ffff888096d2e100 RDI: 0000000000000005
RBP: ffff88808b771218 R08: 000000000000006f R09: 000000000000004f
R10: 0000000000000000 R11: 0000000000000007 R12: ffff88808b771000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff88808b771220
 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
 do_new_mount fs/namespace.c:2890 [inline]
 path_mount+0x60a/0x1e70 fs/namespace.c:3227
 __do_sys_mount fs/namespace.c:3438 [inline]
 __se_sys_mount fs/namespace.c:3411 [inline]
 __x64_sys_mount+0x278/0x2f0 fs/namespace.c:3411
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x441359
Code: Bad RIP value.
RSP: 002b:00007ffd6ed15408 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441359
RDX: 0000000020000040 RSI: 0000000020000180 RDI: 0000000020000000
RBP: 00000000000ac58f R08: 0000000000000000 R09: 00000000004002c8
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000402050
R13: 00000000004020e0 R14: 0000000000000000 R15: 0000000000000000