================================ WARNING: inconsistent lock state 5.12.0-syzkaller #0 Not tainted -------------------------------- inconsistent {HARDIRQ-ON-W} -> {IN-HARDIRQ-W} usage. syz-executor874/5875 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8b244298 (sync_timeline_list_lock){?.+.}-{2:2}, at: sync_timeline_debug_remove+0x19/0x180 drivers/dma-buf/sync_debug.c:31 {HARDIRQ-ON-W} state was registered at: __trace_hardirqs_on_caller kernel/locking/lockdep.c:4098 [inline] lockdep_hardirqs_on_prepare kernel/locking/lockdep.c:4166 [inline] lockdep_hardirqs_on_prepare+0x135/0x400 kernel/locking/lockdep.c:4118 trace_hardirqs_on+0x1c/0x140 kernel/trace/trace_preemptirq.c:49 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:199 spin_unlock_irq include/linux/spinlock.h:404 [inline] sync_print_obj drivers/dma-buf/sync_debug.c:118 [inline] sync_info_debugfs_show+0xd4/0x1d0 drivers/dma-buf/sync_debug.c:153 seq_read_iter+0x3fe/0x1000 fs/seq_file.c:227 seq_read+0x311/0x4e0 fs/seq_file.c:159 vfs_read+0x121/0x470 fs/read_write.c:494 ksys_read+0xf4/0x1d0 fs/read_write.c:634 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae irq event stamp: 5790 hardirqs last enabled at (5789): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:168 [inline] hardirqs last enabled at (5789): [] _raw_spin_unlock_irq+0x1f/0x40 kernel/locking/spinlock.c:199 hardirqs last disabled at (5790): [] sysvec_irq_work+0xb/0xc0 arch/x86/kernel/irq_work.c:17 softirqs last enabled at (5638): [] spin_unlock_bh include/linux/spinlock.h:399 [inline] softirqs last enabled at (5638): [] __tun_set_ebpf+0xbc/0x160 drivers/net/tun.c:2186 softirqs last disabled at (5636): [] spin_lock_bh include/linux/spinlock.h:359 [inline] softirqs last disabled at (5636): [] __tun_set_ebpf+0x8b/0x160 drivers/net/tun.c:2182 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-executor874/5875. stack backtrace: CPU: 0 PID: 5875 Comm: syz-executor874 Not tainted 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xa5/0xe6 lib/dump_stack.c:120 print_usage_bug kernel/locking/lockdep.c:4481 [inline] valid_state kernel/locking/lockdep.c:3819 [inline] mark_lock_irq kernel/locking/lockdep.c:4022 [inline] mark_lock.cold+0x88/0x92 kernel/locking/lockdep.c:4479 mark_usage kernel/locking/lockdep.c:4371 [inline] __lock_acquire+0x1426/0x57d0 kernel/locking/lockdep.c:4855 lock_acquire kernel/locking/lockdep.c:5511 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5476 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:159 sync_timeline_debug_remove+0x19/0x180 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+0x1f6/0x2c0 drivers/dma-buf/sw_sync.c:144 kref_put include/linux/kref.h:65 [inline] dma_fence_put include/linux/dma-fence.h:279 [inline] dma_fence_array_release+0x166/0x230 drivers/dma-buf/dma-fence-array.c:116 irq_work_single+0x106/0x1c0 kernel/irq_work.c:153 irq_work_run_list+0x6a/0x90 kernel/irq_work.c:175 irq_work_run+0x4f/0xd0 kernel/irq_work.c:184 __sysvec_irq_work+0x95/0x3d0 arch/x86/kernel/irq_work.c:22 sysvec_irq_work+0x8e/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x12/0x20 arch/x86/include/asm/idtentry.h:658 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline] RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:199 Code: 0f 1f 44 00 00 55 48 8b 74 24 08 48 89 fd 48 83 c7 18 e8 2e d3 14 f9 48 89 ef e8 66 89 15 f9 e8 21 ec 30 f9 fb bf 01 00 00 00 e6 5a 09 f9 65 8b 05 2f 26 c5 77 85 c0 74 02 5d c3 e8 4b 72 c3 RSP: 0018:ffffc90001a4fe38 EFLAGS: 00000202 RAX: 000000000000169d RBX: ffff888012366c00 RCX: 1ffffffff1869ef9 RDX: 0000000000000000 RSI: ffffffff888ae7c0 RDI: 0000000000000001 RBP: ffff888012366c50 R08: 0000000000000001 R09: 0000000000000001 R10: ffffed100246cd8a R11: 0000000000000001 R12: dffffc0000000000 R13: ffff888012366c00 R14: ffff888012366c50 R15: ffff88802a1a8830 spin_unlock_irq include/linux/spinlock.h:404 [inline] sw_sync_debugfs_release+0x134/0x1e0 drivers/dma-buf/sw_sync.c:321 __fput+0x209/0x870 fs/file_table.c:280 task_work_run+0xc0/0x160 kernel/task_work.c:140 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:174 [inline] exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f6d237e67d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 18 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 ---------------- Code disassembly (best guess): 0: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 5: 55 push %rbp 6: 48 8b 74 24 08 mov 0x8(%rsp),%rsi b: 48 89 fd mov %rdi,%rbp e: 48 83 c7 18 add $0x18,%rdi 12: e8 2e d3 14 f9 callq 0xf914d345 17: 48 89 ef mov %rbp,%rdi 1a: e8 66 89 15 f9 callq 0xf9158985 1f: e8 21 ec 30 f9 callq 0xf930ec45 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 e6 5a 09 f9 callq 0xf9095b15 <-- trapping instruction 2f: 65 8b 05 2f 26 c5 77 mov %gs:0x77c5262f(%rip),%eax # 0x77c52665 36: 85 c0 test %eax,%eax 38: 74 02 je 0x3c 3a: 5d pop %rbp 3b: c3 retq 3c: e8 .byte 0xe8 3d: 4b 72 c3 rex.WXB jb 0x3