------------[ cut here ]------------
task_rq(p) != rq
WARNING: kernel/sched/fair.c:7656 at hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656, CPU#1: udevd/4976
Modules linked in:
CPU: 1 UID: 0 PID: 4976 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:hrtick_start_fair+0x196/0x1f0 kernel/sched/fair.c:7656
Code: 42 80 3c 20 00 74 08 4c 89 ff e8 85 e3 97 00 4d 39 37 0f 85 0c ff ff ff 48 89 df 5b 41 5c 41 5d 41 5e 41 5f e9 4b 65 fa ff 90 <0f> 0b 90 e9 d1 fe ff ff 44 89 f9 80 e1 07 80 c1 03 38 c1 0f 8c 82
RSP: 0018:ffffc9001010f3c0 EFLAGS: 00010006
RAX: ffff8880b863ba40 RBX: ffff8880b873ba40 RCX: ffffffff8197c7de
RDX: 0000000000000000 RSI: ffff888025a31f00 RDI: ffff8880b873ba40
RBP: dffffc0000000000 R08: ffffffff8fcf0b0f R09: 1ffffffff1f9e161
R10: dffffc0000000000 R11: fffffbfff1f9e162 R12: dffffc0000000000
R13: 1ffff110170e78d6 R14: ffff888025a31f00 R15: ffffffff8dc217d0
FS:  00007f8291b95880(0000) GS:ffff888125b76000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b34563fff CR3: 000000001167a000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 set_next_task_fair+0xa68/0xce0 kernel/sched/fair.c:15058
 put_prev_set_next_task kernel/sched/sched.h:2770 [inline]
 pick_next_task kernel/sched/core.c:6443 [inline]
 __schedule+0x3e03/0x5550 kernel/sched/core.c:7144
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7553
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x8c0 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:lock_acquire+0x221/0x350 kernel/locking/lockdep.c:5874
Code: ff ff ff e8 81 fe 9b 09 f7 44 24 08 00 02 00 00 0f 84 3a ff ff ff 65 48 8b 05 2b 79 19 11 48 3b 44 24 58 75 33 fb 48 83 c4 60 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 50 c6 9f 09 cc 48 8d 3d e8 1a 31
RSP: 0018:ffffc9001010f780 EFLAGS: 00000282
RAX: d94c3eec29614600 RBX: 0000000000000000 RCX: 0000000000000046
RDX: 000000005f479b93 RSI: ffffffff8dbda93e RDI: ffffffff8bcc4580
RBP: ffffffff826c5d3c R08: ffffffff826c5d3c R09: ffffffff8e3cb2a0
R10: dffffc0000000000 R11: ffffffff826caf20 R12: 0000000000000002
R13: ffffffff8e3cb2a0 R14: 0000000000000000 R15: 0000000000000246
 rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 rcu_read_lock include/linux/rcupdate.h:840 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1183 [inline]
 kernfs_root+0x38/0x230 fs/kernfs/kernfs-internal.h:76
 kernfs_dop_revalidate+0x8c/0x650 fs/kernfs/dir.c:1216
 d_revalidate fs/namei.c:1035 [inline]
 lookup_fast+0x253/0x5b0 fs/namei.c:-1
 walk_component fs/namei.c:2279 [inline]
 link_path_walk+0x720/0x18d0 fs/namei.c:2657
 path_lookupat+0xe4/0x8c0 fs/namei.c:2813
 filename_lookup+0x256/0x5d0 fs/namei.c:2843
 vfs_statx+0xfc/0x200 fs/stat.c:353
 vfs_fstatat+0x11b/0x170 fs/stat.c:373
 __do_sys_newfstatat fs/stat.c:538 [inline]
 __se_sys_newfstatat fs/stat.c:532 [inline]
 __x64_sys_newfstatat+0x151/0x200 fs/stat.c:532
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8291cedb0a
Code: 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 41 89 ca b8 06 01 00 00 0f 05 <3d> 00 f0 ff ff 77 07 31 c0 c3 0f 1f 40 00 48 8b 15 b9 f2 0d 00 f7
RSP: 002b:00007ffee5ddbd78 EFLAGS: 00000246 ORIG_RAX: 0000000000000106
RAX: ffffffffffffffda RBX: 00007ffee5ddc210 RCX: 00007f8291cedb0a
RDX: 00007ffee5ddbd80 RSI: 00007ffee5ddc210 RDI: 00000000ffffff9c
RBP: 000055bb76cd8910 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffee5ddbe10
R13: 000055bb3e654100 R14: 000055bb76cfe480 R15: 00007ffee5ddc840
 </TASK>
----------------
Code disassembly (best guess), 2 bytes skipped:
   0:	ff                   	ljmp   (bad)
   1:	e8 81 fe 9b 09       	call   0x99bfe87
   6:	f7 44 24 08 00 02 00 	testl  $0x200,0x8(%rsp)
   d:	00
   e:	0f 84 3a ff ff ff    	je     0xffffff4e
  14:	65 48 8b 05 2b 79 19 	mov    %gs:0x1119792b(%rip),%rax        # 0x11197947
  1b:	11
  1c:	48 3b 44 24 58       	cmp    0x58(%rsp),%rax
  21:	75 33                	jne    0x56
  23:	fb                   	sti
  24:	48 83 c4 60          	add    $0x60,%rsp
* 28:	5b                   	pop    %rbx <-- trapping instruction
  29:	41 5c                	pop    %r12
  2b:	41 5d                	pop    %r13
  2d:	41 5e                	pop    %r14
  2f:	41 5f                	pop    %r15
  31:	5d                   	pop    %rbp
  32:	e9 50 c6 9f 09       	jmp    0x99fc687
  37:	cc                   	int3
  38:	48                   	rex.W
  39:	8d                   	.byte 0x8d
  3a:	3d                   	.byte 0x3d
  3b:	e8                   	.byte 0xe8
  3c:	1a 31                	sbb    (%rcx),%dh