================================ WARNING: inconsistent lock state 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor.2/8102 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8e612b18 (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+0x137/0x420 kernel/locking/lockdep.c:4359 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+0x4fa/0x12c0 fs/seq_file.c:230 seq_read+0x390/0x4d0 fs/seq_file.c:162 vfs_read+0x1d4/0xb80 fs/read_write.c:474 ksys_read+0x12f/0x260 fs/read_write.c:619 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x6d/0x75 irq event stamp: 3204 hardirqs last enabled at (3203): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (3203): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (3204): [] sysvec_irq_work+0xe/0xb0 arch/x86/kernel/irq_work.c:17 softirqs last enabled at (2948): [] softirq_handle_end kernel/softirq.c:400 [inline] softirqs last enabled at (2948): [] __do_softirq+0x596/0x8de kernel/softirq.c:583 softirqs last disabled at (2933): [] invoke_softirq kernel/softirq.c:428 [inline] softirqs last disabled at (2933): [] __irq_exit_rcu kernel/softirq.c:633 [inline] softirqs last disabled at (2933): [] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 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.2/8102. stack backtrace: CPU: 1 PID: 8102 Comm: syz-executor.2 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 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+0x923/0xc60 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:4564 [inline] __lock_acquire+0x1359/0x3b30 kernel/locking/lockdep.c:5091 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 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+0x308/0x530 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+0x308/0x530 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+0x1bc/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+0x8c/0x3a0 arch/x86/kernel/irq_work.c:22 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0x90/0xb0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 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 0a 40 95 f6 48 89 df e8 72 bb 95 f6 e8 dd 05 be f6 fb bf 01 00 00 00 02 09 87 f6 65 8b 05 53 d1 2d 75 85 c0 74 06 5b c3 cc cc cc cc RSP: 0018:ffffc9000385faa0 EFLAGS: 00000202 RAX: 0000000000000c83 RBX: ffff88802430fd50 RCX: 1ffffffff1f3c599 RDX: 0000000000000000 RSI: ffffffff8b0cb740 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f9e6f97 R11: 0000000000000001 R12: ffff88802430fd00 R13: dffffc0000000000 R14: ffff88802430fd00 R15: ffff88802430fd50 spin_unlock_irq include/linux/spinlock.h:401 [inline] sw_sync_debugfs_release+0x164/0x240 drivers/dma-buf/sw_sync.c:359 __fput+0x270/0xb80 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa7d/0x2be0 kernel/exit.c:878 do_group_exit+0xd3/0x2a0 kernel/exit.c:1027 get_signal+0x2390/0x2760 kernel/signal.c:2907 arch_do_signal_or_restart+0x90/0x7e0 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+0x14a/0x2a0 kernel/entry/common.c:212 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f652da7de69 Code: Unable to access opcode bytes at 0x7f652da7de3f. RSP: 002b:00007f652e8090c8 EFLAGS: 00000246 ORIG_RAX: 000000000000010f RAX: fffffffffffffdfe RBX: 00007f652dbabf80 RCX: 00007f652da7de69 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020000040 RBP: 00007f652daca47a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f652dbabf80 R15: 00007ffe3adfbd78 vkms_vblank_simulate: vblank timer overrun vcan0: j1939_tp_rxtimer: 0xffff888024a59c00: rx timeout, send abort vcan0: j1939_xtp_rx_abort_one: 0xffff888024a59c00: 0x00000: (3) A timeout occurred and this is the connection abort to close the session. ---------------- 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 0a 40 95 f6 call 0xf6954021 17: 48 89 df mov %rbx,%rdi 1a: e8 72 bb 95 f6 call 0xf695bb91 1f: e8 dd 05 be f6 call 0xf6be0601 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 02 09 87 f6 call 0xf6870931 <-- trapping instruction 2f: 65 8b 05 53 d1 2d 75 mov %gs:0x752dd153(%rip),%eax # 0x752dd189 36: 85 c0 test %eax,%eax 38: 74 06 je 0x40 3a: 5b pop %rbx 3b: c3 ret 3c: cc int3 3d: cc int3 3e: cc int3 3f: cc int3