================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.4.123/6436 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff8880123f2260 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff8880123f2260 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 lock_sock_nested+0x41/0x100 net/core/sock.c:3827 lock_sock include/net/sock.h:1713 [inline] x25_bind+0x209/0x450 net/x25/af_x25.c:694 __sys_bind_socket net/socket.c:1945 [inline] __sys_bind+0x2e3/0x410 net/socket.c:1976 __do_sys_bind net/socket.c:1981 [inline] __se_sys_bind net/socket.c:1979 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1979 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 400850 hardirqs last enabled at (400850): [] __local_bh_enable_ip+0xd0/0x130 kernel/softirq.c:457 hardirqs last disabled at (400849): [] __local_bh_enable_ip+0x71/0x130 kernel/softirq.c:434 softirqs last enabled at (390918): [] __do_softirq kernel/softirq.c:658 [inline] softirqs last enabled at (390918): [] invoke_softirq kernel/softirq.c:498 [inline] softirqs last enabled at (390918): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:737 softirqs last disabled at (400717): [] __do_softirq kernel/softirq.c:658 [inline] softirqs last disabled at (400717): [] invoke_softirq kernel/softirq.c:498 [inline] softirqs last disabled at (400717): [] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:737 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sk_lock-AF_X25); lock(sk_lock-AF_X25); *** DEADLOCK *** locks held by syz.4.123/6436: 1, last CPU#1: #0: ffffffff8eb5c820 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffffffff8eb5c820 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8eb5c820 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6269 stack backtrace: CPU: 1 UID: 0 PID: 6436 Comm: syz.4.123 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28b/0x2e0 kernel/locking/lockdep.c:4058 valid_state+0xbe/0xf0 kernel/locking/lockdep.c:4072 mark_lock_irq+0x36/0x380 kernel/locking/lockdep.c:4283 mark_lock+0x117/0x190 kernel/locking/lockdep.c:4769 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0x6b7/0x2e50 kernel/locking/lockdep.c:5208 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 lock_sock_nested+0x41/0x100 net/core/sock.c:3827 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6245 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6270 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7768 napi_poll net/core/dev.c:7831 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7988 handle_softirqs+0x225/0x840 kernel/softirq.c:624 __do_softirq kernel/softirq.c:658 [inline] invoke_softirq kernel/softirq.c:498 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:737 irq_exit_rcu+0x9/0x30 kernel/softirq.c:754 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca 81 c5 f5 48 89 df e8 82 f9 c5 f5 e8 5d 1f f2 f5 fb bf 01 00 00 00 72 18 b7 f5 65 8b 05 cb 80 93 07 85 c0 74 07 5b c3 cc cc cc cc RSP: 0018:ffffc9000b1d7a50 EFLAGS: 00000206 RAX: 0000000000061d4b RBX: ffff888031d04438 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8e25543f RDI: 0000000000000001 RBP: ffffc9000b1d7c10 R08: ffffffff9058fd7f R09: 1ffffffff20b1faf R10: dffffc0000000000 R11: fffffbfff20b1fb0 R12: 000000000000ac47 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200163af60 spin_unlock_irq include/linux/spinlock.h:402 [inline] snd_rawmidi_write+0x59d/0xbc0 sound/core/rawmidi.c:1628 do_loop_readv_writev fs/read_write.c:851 [inline] vfs_writev+0x4bb/0x990 fs/read_write.c:1060 do_writev+0x154/0x2e0 fs/read_write.c:1104 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff53979e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff53a74c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007ff539a25fa0 RCX: 00007ff53979e0d9 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000006 RBP: 00007ff539835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff539a26038 R14: 00007ff539a25fa0 R15: 00007ffd367b8ba8 BUG: sleeping function called from invalid context at net/core/sock.c:3829 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6436, name: syz.4.123 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 UID: 0 PID: 6436 Comm: syz.4.123 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x378/0x4d0 kernel/sched/core.c:9195 lock_sock_nested+0x56/0x100 net/core/sock.c:3829 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6245 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6270 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7768 napi_poll net/core/dev.c:7831 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7988 handle_softirqs+0x225/0x840 kernel/softirq.c:624 __do_softirq kernel/softirq.c:658 [inline] invoke_softirq kernel/softirq.c:498 [inline] __irq_exit_rcu+0xca/0x220 kernel/softirq.c:737 irq_exit_rcu+0x9/0x30 kernel/softirq.c:754 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:188 [inline] RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:206 Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ca 81 c5 f5 48 89 df e8 82 f9 c5 f5 e8 5d 1f f2 f5 fb bf 01 00 00 00 72 18 b7 f5 65 8b 05 cb 80 93 07 85 c0 74 07 5b c3 cc cc cc cc RSP: 0018:ffffc9000b1d7a50 EFLAGS: 00000206 RAX: 0000000000061d4b RBX: ffff888031d04438 RCX: 0000000080000001 RDX: 0000000000000000 RSI: ffffffff8e25543f RDI: 0000000000000001 RBP: ffffc9000b1d7c10 R08: ffffffff9058fd7f R09: 1ffffffff20b1faf R10: dffffc0000000000 R11: fffffbfff20b1fb0 R12: 000000000000ac47 R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff9200163af60 spin_unlock_irq include/linux/spinlock.h:402 [inline] snd_rawmidi_write+0x59d/0xbc0 sound/core/rawmidi.c:1628 do_loop_readv_writev fs/read_write.c:851 [inline] vfs_writev+0x4bb/0x990 fs/read_write.c:1060 do_writev+0x154/0x2e0 fs/read_write.c:1104 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x510 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff53979e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff53a74c028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007ff539a25fa0 RCX: 00007ff53979e0d9 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000006 RBP: 00007ff539835024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff539a26038 R14: 00007ff539a25fa0 R15: 00007ffd367b8ba8 ---------------- Code disassembly (best guess): 0: 90 nop 1: f3 0f 1e fa endbr64 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 ca 81 c5 f5 call 0xf5c581e1 17: 48 89 df mov %rbx,%rdi 1a: e8 82 f9 c5 f5 call 0xf5c5f9a1 1f: e8 5d 1f f2 f5 call 0xf5f21f81 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 72 18 b7 f5 call 0xf5b718a1 <-- trapping instruction 2f: 65 8b 05 cb 80 93 07 mov %gs:0x79380cb(%rip),%eax # 0x7938101 36: 85 c0 test %eax,%eax 38: 74 07 je 0x41 3a: 5b pop %rbx 3b: c3 ret 3c: cc int3 3d: cc int3 3e: cc int3 3f: cc int3