syzbot

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DEBUG_LOCKS_WARN_ON(1)
WARNING: CPU: 1 PID: 34 at kernel/locking/lockdep.c:234 hlock_class kernel/locking/lockdep.c:234 [inline]
WARNING: CPU: 1 PID: 34 at kernel/locking/lockdep.c:234 check_wait_context kernel/locking/lockdep.c:4852 [inline]
WARNING: CPU: 1 PID: 34 at kernel/locking/lockdep.c:234 __lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5178
Modules linked in:
CPU: 1 UID: 0 PID: 34 Comm: kcompactd1 Not tainted 6.14.0-rc1-syzkaller-00020-g0de63bb7d919 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline]
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4852 [inline]
RIP: 0010:__lock_acquire+0x564/0x2100 kernel/locking/lockdep.c:5178
Code: 00 00 83 3d d1 bf 80 0e 00 75 23 90 48 c7 c7 20 a5 0a 8c 48 c7 c6 20 a8 0a 8c e8 37 45 e5 ff 48 ba 00 00 00 00 00 fc ff df 90 <0f> 0b 90 90 90 31 db 48 81 c3 c4 00 00 00 48 89 d8 48 c1 e8 03 0f
RSP: 0018:ffffc90000a189b0 EFLAGS: 00010046
RAX: cc5a18332f531600 RBX: 0000000000000a20 RCX: ffff888143eb8000
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000000c4a20 R08: ffffffff81800c22 R09: 1ffff110170e519a
R10: dffffc0000000000 R11: ffffed10170e519b R12: ffff888143eb8ad4
R13: 0000000000000000 R14: 1ffff110287d7162 R15: ffff888143eb8b10
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b3020eff8 CR3: 0000000028308000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5851
 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606
 raw_spin_rq_lock kernel/sched/sched.h:1521 [inline]
 rq_lock kernel/sched/sched.h:1852 [inline]
 sched_tick+0x72/0x660 kernel/sched/core.c:5648
 update_process_times+0x276/0x2f0 kernel/time/timer.c:2520
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x37c/0x500 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1801 [inline]
 __hrtimer_run_queues+0x553/0xd30 kernel/time/hrtimer.c:1865
 hrtimer_interrupt+0x403/0xa40 kernel/time/hrtimer.c:1927
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline]
 __sysvec_apic_timer_interrupt+0x112/0x420 arch/x86/kernel/apic/apic.c:1055
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1049
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd8/0x140 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 fe 78 2d f6 f6 44 24 21 02 75 52 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> c3 0f 95 f5 65 8b 05 d4 58 0b 74 85 c0 74 43 48 c7 04 24 0e 36
RSP: 0018:ffffc90000aa7860 EFLAGS: 00000206
RAX: cc5a18332f531600 RBX: 1ffff92000154f10 RCX: ffffffff9a400903
RDX: dffffc0000000000 RSI: ffffffff8c0aa680 RDI: 0000000000000001
RBP: ffffc90000aa78e8 R08: ffffffff901b5177 R09: 1ffffffff2036a2e
R10: dffffc0000000000 R11: fffffbfff2036a2f R12: dffffc0000000000
R13: 1ffff92000154f0c R14: ffffc90000aa7880 R15: 0000000000000246
 __try_to_del_timer_sync+0x340/0x390 kernel/time/timer.c:1508
 __timer_delete_sync+0x245/0x310 kernel/time/timer.c:1662
 del_timer_sync include/linux/timer.h:185 [inline]
 schedule_timeout+0x162/0x290 kernel/time/sleep_timeout.c:100
 kcompactd+0xd40/0x14b0 mm/compaction.c:3199
 kthread+0x7ab/0x920 kernel/kthread.c:464
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
----------------
Code disassembly (best guess):
   0:	9c                   	pushf
   1:	8f 44 24 20          	pop    0x20(%rsp)
   5:	42 80 3c 23 00       	cmpb   $0x0,(%rbx,%r12,1)
   a:	74 08                	je     0x14
   c:	4c 89 f7             	mov    %r14,%rdi
   f:	e8 fe 78 2d f6       	call   0xf62d7912
  14:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
  19:	75 52                	jne    0x6d
  1b:	41 f7 c7 00 02 00 00 	test   $0x200,%r15d
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 c3 0f 95 f5       	call   0xf5950ff2 <-- trapping instruction
  2f:	65 8b 05 d4 58 0b 74 	mov    %gs:0x740b58d4(%rip),%eax        # 0x740b590a
  36:	85 c0                	test   %eax,%eax
  38:	74 43                	je     0x7d
  3a:	48                   	rex.W
  3b:	c7                   	.byte 0xc7
  3c:	04 24                	add    $0x24,%al
  3e:	0e                   	(bad)
  3f:	36                   	ss