================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. swapper/1/0 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88802e378130 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline] ffff88802e378130 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1782 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3544 lock_sock include/net/sock.h:1780 [inline] x25_bind+0x20a/0x460 net/x25/af_x25.c:698 __sys_bind+0x2f0/0x3f0 net/socket.c:1856 __do_sys_bind net/socket.c:1867 [inline] __se_sys_bind net/socket.c:1865 [inline] __x64_sys_bind+0x7a/0x90 net/socket.c:1865 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 4305262 hardirqs last enabled at (4305262): [] __local_bh_enable_ip+0x13a/0x1c0 kernel/softirq.c:411 hardirqs last disabled at (4305261): [] __local_bh_enable_ip+0xdb/0x1c0 kernel/softirq.c:388 softirqs last enabled at (4304972): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (4304972): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (4304972): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (4304985): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (4304985): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (4304985): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sk_lock-AF_X25); lock(sk_lock-AF_X25); *** DEADLOCK *** 1 lock held by swapper/1/0: #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d131da0 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_core+0x34/0x230 net/core/dev.c:5670 stack backtrace: CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:4013 mark_lock_irq+0xad/0x900 kernel/locking/lockdep.c:4216 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4678 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xcfc/0x7d80 kernel/locking/lockdep.c:5091 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 lock_sock_nested+0x48/0x100 net/core/sock.c:3544 lock_sock include/net/sock.h:1780 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1782 x25_lapb_receive_frame+0x1a7/0xef0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:5646 [inline] netif_receive_skb_core+0x16a/0x230 net/core/dev.c:5671 lapbeth_napi_poll+0x42/0x80 drivers/net/wan/lapbether.c:99 __napi_poll+0xbb/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x65f/0xcc0 net/core/dev.c:6853 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148 Code: 4e 1c 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d a3 5a 3b 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9 RSP: 0018:ffffc90000187de0 EFLAGS: 000002c2 RAX: 7f594c85aa72b900 RBX: ffffffff81630d54 RCX: 7f594c85aa72b900 RDX: 0000000000000001 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0ca0 RBP: ffffc90000187f20 R08: ffff8880b8f36bab R09: 1ffff110171e6d75 R10: dffffc0000000000 R11: ffffed10171e6d76 R12: 1ffff92000030fc8 R13: dffffc0000000000 R14: 1ffff110037cf780 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:753 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:178 [inline] do_idle+0x334/0x5c0 kernel/sched/idle.c:302 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323 secondary_startup_64_no_verify+0x179/0x17b BUG: sleeping function called from invalid context at net/core/sock.c:3546 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 0, name: swapper/1 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 __might_resched+0x48d/0x5f0 kernel/sched/core.c:10212 lock_sock_nested+0x5d/0x100 net/core/sock.c:3546 lock_sock include/net/sock.h:1780 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1782 x25_lapb_receive_frame+0x1a7/0xef0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:5646 [inline] netif_receive_skb_core+0x16a/0x230 net/core/dev.c:5671 lapbeth_napi_poll+0x42/0x80 drivers/net/wan/lapbether.c:99 __napi_poll+0xbb/0x460 net/core/dev.c:6650 napi_poll net/core/dev.c:6717 [inline] net_rx_action+0x65f/0xcc0 net/core/dev.c:6853 handle_softirqs+0x27d/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:pv_native_safe_halt+0xf/0x10 arch/x86/kernel/paravirt.c:148 Code: 4e 1c 02 c3 cc cc cc cc cc cc cc f3 0f 1e fa 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 66 90 0f 00 2d a3 5a 3b 00 fb f4 66 0f 1f 00 55 41 57 41 56 41 54 53 50 8b 2f eb 2c 89 cb 80 f9 RSP: 0018:ffffc90000187de0 EFLAGS: 000002c2 RAX: 7f594c85aa72b900 RBX: ffffffff81630d54 RCX: 7f594c85aa72b900 RDX: 0000000000000001 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0ca0 RBP: ffffc90000187f20 R08: ffff8880b8f36bab R09: 1ffff110171e6d75 R10: dffffc0000000000 R11: ffffed10171e6d76 R12: 1ffff92000030fc8 R13: dffffc0000000000 R14: 1ffff110037cf780 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:108 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:753 default_idle_call+0x6c/0xa0 kernel/sched/idle.c:97 cpuidle_idle_call kernel/sched/idle.c:178 [inline] do_idle+0x334/0x5c0 kernel/sched/idle.c:302 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:401 start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323 secondary_startup_64_no_verify+0x179/0x17b ---------------- Code disassembly (best guess): 0: 4e 1c 02 rex.WRX sbb $0x2,%al 3: c3 ret 4: cc int3 5: cc int3 6: cc int3 7: cc int3 8: cc int3 9: cc int3 a: cc int3 b: f3 0f 1e fa endbr64 f: 0f 0b ud2 11: 66 2e 0f 1f 84 00 00 cs nopw 0x0(%rax,%rax,1) 18: 00 00 00 1b: f3 0f 1e fa endbr64 1f: 66 90 xchg %ax,%ax 21: 0f 00 2d a3 5a 3b 00 verw 0x3b5aa3(%rip) # 0x3b5acb 28: fb sti 29: f4 hlt * 2a: c3 ret <-- trapping instruction 2b: 66 0f 1f 00 nopw (%rax) 2f: 55 push %rbp 30: 41 57 push %r15 32: 41 56 push %r14 34: 41 54 push %r12 36: 53 push %rbx 37: 50 push %rax 38: 8b 2f mov (%rdi),%ebp 3a: eb 2c jmp 0x68 3c: 89 cb mov %ecx,%ebx 3e: 80 .byte 0x80 3f: f9 stc