syzbot

================================
WARNING: inconsistent lock state
6.8.0-rc1-syzkaller-00356-g8a696a29c690 #0 Not tainted
--------------------------------
inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage.
syz-executor223/5062 [HC1[1]:SC0[0]:HE0:SE1] takes:
ffffffff8e010e78 (sync_timeline_list_lock){?.+.}-{2:2}, at: sync_timeline_debug_remove+0x29/0x1a0 drivers/dma-buf/sync_debug.c:31
{HARDIRQ-ON-W} state was registered at:
  __trace_hardirqs_on_caller kernel/locking/lockdep.c:4292 [inline]
  lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4359 [inline]
  lockdep_hardirqs_on_prepare+0x139/0x420 kernel/locking/lockdep.c:4311
  trace_hardirqs_on+0x36/0x40 kernel/trace/trace_preemptirq.c:61
  __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
  _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202
  spin_unlock_irq include/linux/spinlock.h:401 [inline]
  sync_print_obj drivers/dma-buf/sync_debug.c:118 [inline]
  sync_info_debugfs_show+0xef/0x200 drivers/dma-buf/sync_debug.c:153
  seq_read_iter+0x4e5/0x1280 fs/seq_file.c:230
  seq_read+0x392/0x4d0 fs/seq_file.c:162
  vfs_read+0x1d4/0xb70 fs/read_write.c:474
  ksys_read+0x12f/0x250 fs/read_write.c:619
  do_syscall_x64 arch/x86/entry/common.c:52 [inline]
  do_syscall_64+0xd3/0x250 arch/x86/entry/common.c:83
  entry_SYSCALL_64_after_hwframe+0x63/0x6b
irq event stamp: 3040
hardirqs last  enabled at (3039): [<ffffffff8a91ff73>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline]
hardirqs last  enabled at (3039): [<ffffffff8a91ff73>] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202
hardirqs last disabled at (3040): [<ffffffff8a8e3a8e>] sysvec_irq_work+0xe/0xb0 arch/x86/kernel/irq_work.c:17
softirqs last  enabled at (0): [<ffffffff814d7acb>] copy_process+0x245b/0x97b0 kernel/fork.c:2443
softirqs last disabled at (0): [<0000000000000000>] 0x0

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(sync_timeline_list_lock);
  <Interrupt>
    lock(sync_timeline_list_lock);

 *** DEADLOCK ***

no locks held by syz-executor223/5062.

stack backtrace:
CPU: 1 PID: 5062 Comm: syz-executor223 Not tainted 6.8.0-rc1-syzkaller-00356-g8a696a29c690 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 print_usage_bug kernel/locking/lockdep.c:3971 [inline]
 valid_state kernel/locking/lockdep.c:4013 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4216 [inline]
 mark_lock+0x91a/0xc50 kernel/locking/lockdep.c:4678
 mark_usage kernel/locking/lockdep.c:4564 [inline]
 __lock_acquire+0x137a/0x3b30 kernel/locking/lockdep.c:5091
 lock_acquire kernel/locking/lockdep.c:5754 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
 sync_timeline_debug_remove+0x29/0x1a0 drivers/dma-buf/sync_debug.c:31
 sync_timeline_free drivers/dma-buf/sw_sync.c:125 [inline]
 kref_put include/linux/kref.h:65 [inline]
 sync_timeline_put drivers/dma-buf/sw_sync.c:137 [inline]
 timeline_fence_release+0x262/0x340 drivers/dma-buf/sw_sync.c:165
 dma_fence_release+0x2f3/0x510 drivers/dma-buf/dma-fence.c:560
 kref_put include/linux/kref.h:65 [inline]
 dma_fence_put include/linux/dma-fence.h:297 [inline]
 dma_fence_put include/linux/dma-fence.h:294 [inline]
 dma_fence_array_release+0x1fa/0x2e0 drivers/dma-buf/dma-fence-array.c:120
 dma_fence_release+0x2f3/0x510 drivers/dma-buf/dma-fence.c:560
 kref_put include/linux/kref.h:65 [inline]
 dma_fence_put include/linux/dma-fence.h:297 [inline]
 dma_fence_put include/linux/dma-fence.h:294 [inline]
 irq_dma_fence_array_work+0xa9/0xd0 drivers/dma-buf/dma-fence-array.c:52
 irq_work_single+0x1b5/0x260 kernel/irq_work.c:221
 irq_work_run_list+0x92/0xc0 kernel/irq_work.c:252
 irq_work_run+0x58/0xd0 kernel/irq_work.c:261
 __sysvec_irq_work+0x82/0x3a0 arch/x86/kernel/irq_work.c:22
 sysvec_irq_work+0x90/0xb0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202
Code: 90 f3 0f 1e fa 53 48 8b 74 24 08 48 89 fb 48 83 c7 18 e8 4a 76 d6 f6 48 89 df e8 42 ee d6 f6 e8 8d 05 fd f6 fb bf 01 00 00 00 <e8> 42 8e c8 f6 65 8b 05 03 c3 71 75 85 c0 74 02 5b c3 e8 70 81 6e
RSP: 0018:ffffc90003b4faa0 EFLAGS: 00000202
RAX: 0000000000000bdf RBX: ffff888018e8f270 RCX: 1ffffffff1e75901
RDX: 0000000000000000 RSI: ffffffff8accae80 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8f3afa97 R11: 0000000000000001 R12: ffff888018e8f220
R13: dffffc0000000000 R14: ffff888018e8f220 R15: ffff888018e8f270
 spin_unlock_irq include/linux/spinlock.h:401 [inline]
 sw_sync_debugfs_release+0x164/0x240 drivers/dma-buf/sw_sync.c:359
 __fput+0x270/0xb70 fs/file_table.c:376
 task_work_run+0x14d/0x240 kernel/task_work.c:180
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0xa8a/0x2ad0 kernel/exit.c:871
 do_group_exit+0xd4/0x2a0 kernel/exit.c:1020
 get_signal+0x23b5/0x2790 kernel/signal.c:2893
 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop kernel/entry/common.c:105 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
 syscall_exit_to_user_mode+0x156/0x2b0 kernel/entry/common.c:212
 do_syscall_64+0xe0/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f5d111bdd69
Code: Unable to access opcode bytes at 0x7f5d111bdd3f.
RSP: 002b:00007ffcda73ed58 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: fffffffffffffdfe RBX: 0000000000000000 RCX: 00007f5d111bdd69
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000100
RBP: 00000000000f4240 R08: 0000000000000000 R09: 00000000000000a0
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007ffcda73ef78 R14: 00007ffcda73ed80 R15: 00007ffcda73ed70
 </TASK>
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	f3 0f 1e fa          	endbr64
   5:	53                   	push   %rbx
   6:	48 8b 74 24 08       	mov    0x8(%rsp),%rsi
   b:	48 89 fb             	mov    %rdi,%rbx
   e:	48 83 c7 18          	add    $0x18,%rdi
  12:	e8 4a 76 d6 f6       	call   0xf6d67661
  17:	48 89 df             	mov    %rbx,%rdi
  1a:	e8 42 ee d6 f6       	call   0xf6d6ee61
  1f:	e8 8d 05 fd f6       	call   0xf6fd05b1
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 42 8e c8 f6       	call   0xf6c88e71 <-- trapping instruction
  2f:	65 8b 05 03 c3 71 75 	mov    %gs:0x7571c303(%rip),%eax        # 0x7571c339
  36:	85 c0                	test   %eax,%eax
  38:	74 02                	je     0x3c
  3a:	5b                   	pop    %rbx
  3b:	c3                   	ret
  3c:	e8                   	.byte 0xe8
  3d:	70 81                	jo     0xffffffc0
  3f:	6e                   	outsb  %ds:(%rsi),(%dx)