================================ WARNING: inconsistent lock state 6.1.21-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.1/20105 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8d7df8b8 (sync_timeline_list_lock){?.+.}-{2:2}, at: sync_timeline_debug_remove+0x28/0x140 drivers/dma-buf/sync_debug.c:31 {HARDIRQ-ON-W} state was registered at: trace_hardirqs_on+0x34/0x40 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:400 [inline] sync_print_obj drivers/dma-buf/sync_debug.c:118 [inline] sync_info_debugfs_show+0x154/0x4c0 drivers/dma-buf/sync_debug.c:153 seq_read_iter+0x43a/0xd10 fs/seq_file.c:230 seq_read+0x289/0x380 fs/seq_file.c:162 vfs_read+0x2ed/0xbe0 fs/read_write.c:468 ksys_read+0x19c/0x2c0 fs/read_write.c:613 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd irq event stamp: 526 hardirqs last enabled at (525): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (525): [] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:202 hardirqs last disabled at (526): [] sysvec_irq_work+0xa/0xb0 arch/x86/kernel/irq_work.c:17 softirqs last enabled at (0): [] copy_process+0x155d/0x4020 kernel/fork.c:2201 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); lock(sync_timeline_list_lock); *** DEADLOCK *** no locks held by syz-executor.1/20105. stack backtrace: CPU: 0 PID: 20105 Comm: syz-executor.1 Not tainted 6.1.21-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/02/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 valid_state+0x136/0x1c0 kernel/locking/lockdep.c:3976 mark_lock_irq+0xa8/0xba0 kernel/locking/lockdep.c:4179 mark_lock+0x21c/0x340 kernel/locking/lockdep.c:4635 mark_usage kernel/locking/lockdep.c:4527 [inline] __lock_acquire+0xb40/0x1f80 kernel/locking/lockdep.c:5010 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5669 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162 sync_timeline_debug_remove+0x28/0x140 drivers/dma-buf/sync_debug.c:31 sync_timeline_free drivers/dma-buf/sw_sync.c:104 [inline] kref_put include/linux/kref.h:65 [inline] sync_timeline_put drivers/dma-buf/sw_sync.c:116 [inline] timeline_fence_release+0x200/0x250 drivers/dma-buf/sw_sync.c:144 kref_put include/linux/kref.h:65 [inline] dma_fence_put include/linux/dma-fence.h:276 [inline] dma_fence_array_release+0x13a/0x240 drivers/dma-buf/dma-fence-array.c:120 irq_work_single+0xd5/0x230 kernel/irq_work.c:211 irq_work_run_list kernel/irq_work.c:242 [inline] irq_work_run+0x187/0x350 kernel/irq_work.c:251 __sysvec_irq_work+0xbb/0x360 arch/x86/kernel/irq_work.c:22 sysvec_irq_work+0x89/0xb0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:675 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: f1 41 f6 ff 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8e 8b e2 f6 48 89 df e8 e6 c7 e3 f6 e8 e1 ff 08 f7 fb bf 01 00 00 00 46 95 d6 f6 65 8b 05 87 38 7b 75 85 c0 74 02 5b c3 e8 84 56 79 RSP: 0018:ffffc9001825fcf0 EFLAGS: 00000286 RAX: 25bd42f6cebb8700 RBX: ffff88807bf95e50 RCX: ffffffff91a67003 RDX: dffffc0000000000 RSI: ffffffff8aebc5e0 RDI: 0000000000000001 RBP: ffff888077007a3c R08: dffffc0000000000 R09: ffffed100f7f2bcb R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88807bf95e40 R13: ffff888077007a00 R14: dffffc0000000000 R15: ffff88807bf95e00 spin_unlock_irq include/linux/spinlock.h:400 [inline] sw_sync_debugfs_release+0x145/0x1c0 drivers/dma-buf/sw_sync.c:321 __fput+0x3b7/0x890 fs/file_table.c:320 task_work_run+0x246/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:296 do_syscall_64+0x49/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f63d3a8c0f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f63d48d4168 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f63d3babf80 RCX: 00007f63d3a8c0f9 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000003 RBP: 00007f63d3ae7b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc3f3cde4f R14: 00007f63d48d4300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: f1 icebp 1: 41 f6 ff idiv %r15b 4: 90 nop 5: 53 push %rbx 6: 48 89 fb mov %rdi,%rbx 9: 48 83 c7 18 add $0x18,%rdi d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi 12: e8 8e 8b e2 f6 callq 0xf6e28ba5 17: 48 89 df mov %rbx,%rdi 1a: e8 e6 c7 e3 f6 callq 0xf6e3c805 1f: e8 e1 ff 08 f7 callq 0xf7090005 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 46 95 d6 f6 callq 0xf6d69575 <-- trapping instruction 2f: 65 8b 05 87 38 7b 75 mov %gs:0x757b3887(%rip),%eax # 0x757b38bd 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5b pop %rbx 3b: c3 retq 3c: e8 .byte 0xe8 3d: 84 56 79 test %dl,0x79(%rsi)