rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10499 ticks this GP) idle=d37/1/0x4000000000000000 softirq=18551/18560 fqs=5215 
	(t=10500 jiffies g=24549 q=1155)
NMI backtrace for cpu 0
CPU: 0 PID: 7552 Comm: syz-executor.0 Not tainted 5.16.0-rc7-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:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x5c/0x759 kernel/rcu/tree.c:2597
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 3e dc 15 f8 48 89 ef e8 f6 51 16 f8 e8 91 03 37 f8 fb bf 01 00 00 00 <e8> 46 1c 09 f8 65 8b 05 5f a1 bb 76 85 c0 74 02 5d c3 e8 7b 76 b9
RSP: 0018:ffffc9000f947528 EFLAGS: 00000206
RAX: 000000000505c96f RBX: dffffc0000000000 RCX: 1ffffffff1fef716
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffffff8bd5c4b8 R08: 0000000000000001 R09: ffffffff8ff76a0f
R10: 0000000000000001 R11: 0000000000000001 R12: 1ffffffff1701e30
R13: ffff8880215f1d00 R14: ffffffff8bd5c4b8 R15: ffffc90000ca7b28
 rwsem_down_write_slowpath+0x576/0x1110 kernel/locking/rwsem.c:1127
 __down_write_common kernel/locking/rwsem.c:1268 [inline]
 __down_write_common kernel/locking/rwsem.c:1265 [inline]
 __down_write kernel/locking/rwsem.c:1277 [inline]
 down_write+0x135/0x150 kernel/locking/rwsem.c:1524
 kernfs_add_one+0x4f/0x4c0 fs/kernfs/dir.c:725
 __kernfs_create_file+0x29c/0x350 fs/kernfs/file.c:1014
 sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
 create_files fs/sysfs/group.c:64 [inline]
 internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
 internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:188
 internal_create_groups fs/sysfs/group.c:184 [inline]
 sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:214
 create_dir lib/kobject.c:100 [inline]
 kobject_add_internal+0x583/0xa60 lib/kobject.c:255
 kobject_add_varg lib/kobject.c:390 [inline]
 kobject_init_and_add+0x101/0x160 lib/kobject.c:473
 ext4_register_sysfs+0xb5/0x360 fs/ext4/sysfs.c:524
 ext4_fill_super+0x852e/0xd6b0 fs/ext4/super.c:4939
 mount_bdev+0x34d/0x410 fs/super.c:1370
 legacy_get_tree+0x105/0x220 fs/fs_context.c:610
 vfs_get_tree+0x89/0x2f0 fs/super.c:1500
 do_new_mount fs/namespace.c:2988 [inline]
 path_mount+0x1320/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f0b801f83ca
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0b7eb6bf88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f0b801f83ca
RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007f0b7eb6bfe0
RBP: 00007f0b7eb6c020 R08: 00007f0b7eb6c020 R09: 0000000020000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000
R13: 0000000020000100 R14: 00007f0b7eb6bfe0 R15: 00000000200000c0
 </TASK>
----------------
Code disassembly (best guess):
   0:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
   5:	55                   	push   %rbp
   6:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   b:	48 89 fd             	mov    %rdi,%rbp
   e:	48 83 c7 18          	add    $0x18,%rdi
  12:	e8 3e dc 15 f8       	callq  0xf815dc55
  17:	48 89 ef             	mov    %rbp,%rdi
  1a:	e8 f6 51 16 f8       	callq  0xf8165215
  1f:	e8 91 03 37 f8       	callq  0xf83703b5
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 46 1c 09 f8       	callq  0xf8091c75 <-- trapping instruction
  2f:	65 8b 05 5f a1 bb 76 	mov    %gs:0x76bba15f(%rip),%eax        # 0x76bba195
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5d                   	pop    %rbp
  3b:	c3                   	retq
  3c:	e8                   	.byte 0xe8
  3d:	7b 76                	jnp    0xb5
  3f:	b9                   	.byte 0xb9