================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/0:1/10 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807ac9c260 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff88807ac9c260 (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+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 95964 hardirqs last enabled at (95964): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (95963): [] __local_bh_enable_ip+0x72/0x140 kernel/softirq.c:455 softirqs last enabled at (95762): [] process_one_work kernel/workqueue.c:3387 [inline] softirqs last enabled at (95762): [] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3470 softirqs last disabled at (95799): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (95799): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (95799): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 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 kworker/0:1/10: 1, last CPU#0: #0: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8ed5c6e0 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6288 stack backtrace: CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: 0x0 (events_freezable) Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28c/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:6264 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6289 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8007 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_call_function_single arch/x86/kernel/smp.c:267 [inline] sysvec_call_function_single+0xa3/0xc0 arch/x86/kernel/smp.c:267 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:681 RIP: 0010:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5371 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 57 b0 4f 0a e8 12 fb 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 10 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900000f7a60 EFLAGS: 00000206 RAX: 0000000000017635 RBX: ffff8880b863c8e0 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff8e4730be RDI: ffffffff8c6d8b80 RBP: ffffc900000f7ab0 R08: ffffffff907a027f R09: 1ffffffff20f404f R10: dffffc0000000000 R11: fffffbfff20f4050 R12: ffff88801defbe80 R13: ffff8880b863c8b8 R14: dffffc0000000000 R15: 1ffff110170c791c context_switch kernel/sched/core.c:5523 [inline] __schedule+0x17dc/0x5820 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7362 worker_thread+0xc12/0xfb0 kernel/workqueue.c:3566 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: sleeping function called from invalid context at net/core/sock.c:3829 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 10, name: kworker/0:1 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] __schedule_loop kernel/sched/core.c:7346 [inline] [] schedule+0x15d/0x2b0 kernel/sched/core.c:7362 CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: 0x0 (events_freezable) Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9234 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:6264 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6289 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7787 napi_poll net/core/dev.c:7850 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8007 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_call_function_single arch/x86/kernel/smp.c:267 [inline] sysvec_call_function_single+0xa3/0xc0 arch/x86/kernel/smp.c:267 asm_sysvec_call_function_single+0x1a/0x20 arch/x86/include/asm/idtentry.h:681 RIP: 0010:finish_task_switch+0x413/0xc60 kernel/sched/core.c:5371 Code: 04 00 00 41 c7 84 24 20 0e 00 00 00 00 00 00 0f 1f 44 00 00 49 83 c4 48 4c 89 e7 e8 57 b0 4f 0a e8 12 fb 39 00 fb 4c 8b 65 c8 <49> 8d bc 24 10 17 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900000f7a60 EFLAGS: 00000206 RAX: 0000000000017635 RBX: ffff8880b863c8e0 RCX: 8000000000000001 RDX: 0000000000000000 RSI: ffffffff8e4730be RDI: ffffffff8c6d8b80 RBP: ffffc900000f7ab0 R08: ffffffff907a027f R09: 1ffffffff20f404f R10: dffffc0000000000 R11: fffffbfff20f4050 R12: ffff88801defbe80 R13: ffff8880b863c8b8 R14: dffffc0000000000 R15: 1ffff110170c791c context_switch kernel/sched/core.c:5523 [inline] __schedule+0x17dc/0x5820 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7362 worker_thread+0xc12/0xfb0 kernel/workqueue.c:3566 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 00 00 add %al,(%rax) 2: 41 c7 84 24 20 0e 00 movl $0x0,0xe20(%r12) 9: 00 00 00 00 00 e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 13: 49 83 c4 48 add $0x48,%r12 17: 4c 89 e7 mov %r12,%rdi 1a: e8 57 b0 4f 0a call 0xa4fb076 1f: e8 12 fb 39 00 call 0x39fb36 24: fb sti 25: 4c 8b 65 c8 mov -0x38(%rbp),%r12 * 29: 49 8d bc 24 10 17 00 lea 0x1710(%r12),%rdi <-- trapping instruction 30: 00 31: 48 89 f8 mov %rdi,%rax 34: 48 c1 e8 03 shr $0x3,%rax 38: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax 3d: 84 c0 test %al,%al