================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. ksoftirqd/1/22 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807988e130 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline] ffff88807988e130 (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: 825270 hardirqs last enabled at (825270): [] __local_bh_enable_ip+0x13a/0x1c0 kernel/softirq.c:411 hardirqs last disabled at (825269): [] __local_bh_enable_ip+0xdb/0x1c0 kernel/softirq.c:388 softirqs last enabled at (825176): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (825176): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (825176): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (825181): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (825181): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (825181): [] __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 ksoftirqd/1/22: #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: 22 Comm: ksoftirqd/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:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256 Code: 2f 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 93 d0 38 09 e8 1e 19 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900001c7ba0 EFLAGS: 00000286 RAX: afd346854cae9100 RBX: 0000000000000000 RCX: afd346854cae9100 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0ca0 RBP: ffffc900001c7bf0 R08: ffffffff8e8c7aef R09: 1ffffffff1d18f5d R10: dffffc0000000000 R11: fffffbfff1d18f5e R12: ffff88801be5bc00 R13: 1ffff110171e79a9 R14: dffffc0000000000 R15: ffff8880b8f3cd48 context_switch kernel/sched/core.c:5385 [inline] __schedule+0x15b6/0x4660 kernel/sched/core.c:6701 schedule+0xbd/0x170 kernel/sched/core.c:6775 smpboot_thread_fn+0x71c/0x9f0 kernel/smpboot.c:160 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 BUG: sleeping function called from invalid context at net/core/sock.c:3546 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 22, name: ksoftirqd/1 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] schedule+0xb6/0x170 kernel/sched/core.c:6774 CPU: 1 PID: 22 Comm: ksoftirqd/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:finish_task_switch+0x267/0x8f0 kernel/sched/core.c:5256 Code: 2f 09 85 c0 0f 84 30 01 00 00 48 85 db 0f 85 4f 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 93 d0 38 09 e8 1e 19 30 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 RSP: 0018:ffffc900001c7ba0 EFLAGS: 00000286 RAX: afd346854cae9100 RBX: 0000000000000000 RCX: afd346854cae9100 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: ffffffff8b1d0ca0 RBP: ffffc900001c7bf0 R08: ffffffff8e8c7aef R09: 1ffffffff1d18f5d R10: dffffc0000000000 R11: fffffbfff1d18f5e R12: ffff88801be5bc00 R13: 1ffff110171e79a9 R14: dffffc0000000000 R15: ffff8880b8f3cd48 context_switch kernel/sched/core.c:5385 [inline] __schedule+0x15b6/0x4660 kernel/sched/core.c:6701 schedule+0xbd/0x170 kernel/sched/core.c:6775 smpboot_thread_fn+0x71c/0x9f0 kernel/smpboot.c:160 kthread+0x2fa/0x390 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 09 85 c0 0f 84 30 or %eax,0x30840fc0(%rbp) 6: 01 00 add %eax,(%rax) 8: 00 48 85 add %cl,-0x7b(%rax) b: db 0f fisttpl (%rdi) d: 85 4f 01 test %ecx,0x1(%rdi) 10: 00 00 add %al,(%rax) 12: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 17: 4c 89 e7 mov %r12,%rdi 1a: e8 93 d0 38 09 call 0x938d0b2 1f: e8 1e 19 30 00 call 0x301942 24: fb sti 25: 4c 8b 65 b8 mov -0x48(%rbp),%r12 * 29: 49 8d bc 24 f8 15 00 lea 0x15f8(%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