rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1):
------------[ cut here ]------------
WARNING: CPU: 1 PID: 13648 at kernel/sched/core.c:3013 rq_unlock kernel/sched/sched.h:1326 [inline]
WARNING: CPU: 1 PID: 13648 at kernel/sched/core.c:3013 try_invoke_on_locked_down_task+0x21d/0x2f0 kernel/sched/core.c:3019
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 13648 Comm: syz-executor094 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x198/0x1fd lib/dump_stack.c:118
 panic+0x382/0x7fb kernel/panic.c:231
 __warn.cold+0x20/0x4b kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:234
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:254
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:536
RIP: 0010:try_invoke_on_locked_down_task+0x21d/0x2f0 kernel/sched/core.c:3013
Code: 45 31 f6 49 39 c0 74 3a 8b 74 24 38 49 8d 78 18 4c 89 04 24 e8 a4 e7 08 00 4c 8b 04 24 4c 89 c7 e8 78 9b d6 06 e9 20 ff ff ff <0f> 0b e9 7d fe ff ff 4c 89 ee 48 89 ef 41 ff d4 41 89 c6 e9 08 ff
RSP: 0018:ffffc90000da8be0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 1ffff920001b517e RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff8162d9c0 RDI: ffff8880876a6180
RBP: ffff8880876a6180 R08: 0000000000000033 R09: ffffffff8a05ae03
R10: 0000000000000631 R11: 0000000000000001 R12: ffffffff8162d9c0
R13: ffffc90000da8d08 R14: ffff8880876a6180 R15: 0000000000000000
 rcu_print_task_stall kernel/rcu/tree_stall.h:267 [inline]
 print_other_cpu_stall kernel/rcu/tree_stall.h:475 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:634 [inline]
 rcu_pending kernel/rcu/tree.c:3639 [inline]
 rcu_sched_clock_irq.cold+0x97e/0xdfd kernel/rcu/tree.c:2521
 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+0x1d5/0xfc0 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+0x147/0x5f0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706
 </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:581
RIP: 0010:strncasecmp lib/string.c:53 [inline]
RIP: 0010:strncasecmp+0x9b/0x240 lib/string.c:43
Code: 0f b6 6c 24 ff 4c 8d 7e 01 48 89 f0 48 89 f7 48 c1 e8 03 83 e7 07 42 0f b6 04 28 89 e9 40 38 f8 7f 08 84 c0 0f 85 00 01 00 00 <41> 0f b6 5f ff 40 84 ed 89 de 0f 84 97 00 00 00 84 db 0f 84 8f 00
RSP: 0018:ffffc90008c2f958 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000000005d RCX: 0000000000000024
RDX: ffff8880a6abf90a RSI: ffff8880935b1183 RDI: 0000000000000003
RBP: 0000000000000024 R08: 0000000000000001 R09: ffff88809ed8d8ab
R10: 0000000000000000 R11: 0000000000000006 R12: ffff8880a6abf903
R13: dffffc0000000000 R14: 000000000000000a R15: ffff8880935b1184
 afs_lookup_cell_rcu+0x313/0x720 fs/afs/cell.c:88
 afs_lookup_cell+0x2ee/0x1440 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:2871 [inline]
 path_mount+0x133f/0x20a0 fs/namespace.c:3192
 do_mount fs/namespace.c:3205 [inline]
 __do_sys_mount fs/namespace.c:3413 [inline]
 __se_sys_mount fs/namespace.c:3390 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3390
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44d00a
Code: b8 08 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 7d a1 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 5a a1 fb ff c3 66 0f 1f 84 00 00 00 00 00
RSP: 002b:00007f0d73636c48 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f0d73636c90 RCX: 000000000044d00a
RDX: 0000000020000000 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007f0d73636c90 R09: 00007f0d73637700
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0d736376d0
R13: 00007ffc54cfb6bf R14: 00007f0d736379c0 R15: 0000000000000000
Kernel Offset: disabled
Rebooting in 86400 seconds..