================================
WARNING: inconsistent lock state
syzkaller #0 Not tainted
--------------------------------
inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage.
ksoftirqd/1/20 [HC0[0]:SC1[1]:HE1:SE0] takes:
ffff888146920120
 (
sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1777
{SOFTIRQ-ON-W} state was registered at:
  lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
  lock_sock_nested+0x44/0x100 net/core/sock.c:3259
  lock_sock include/net/sock.h:1744 [inline]
  x25_bind+0x18a/0x3b0 net/x25/af_x25.c:698
  __sys_bind+0x2e9/0x3e0 net/socket.c:1730
  __do_sys_bind net/socket.c:1741 [inline]
  __se_sys_bind net/socket.c:1739 [inline]
  __x64_sys_bind+0x76/0x80 net/socket.c:1739
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x66/0xd0
irq event stamp: 444236
hardirqs last  enabled at (444236): [<ffffffff814926e6>] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:406
hardirqs last disabled at (444235): [<ffffffff81492687>] __local_bh_enable_ip+0xd7/0x1c0 kernel/softirq.c:383
softirqs last  enabled at (444200): [<ffffffff814951c4>] run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
softirqs last disabled at (444205): [<ffffffff814951c4>] run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(sk_lock-AF_X25);
  <Interrupt>
    lock(sk_lock-AF_X25);

 *** DEADLOCK ***

1 lock held by ksoftirqd/1/20:
 #0: ffffffff8c31ef60 (
rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313

stack backtrace:
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:3932
 mark_lock_irq+0xa9/0x900 kernel/locking/lockdep.c:4135
 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4591
 mark_usage kernel/locking/lockdep.c:-1 [inline]
 __lock_acquire+0xc63/0x7b50 kernel/locking/lockdep.c:4966
 lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623
 lock_sock_nested+0x44/0x100 net/core/sock.c:3259
 lock_sock include/net/sock.h:1744 [inline]
 x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1777
 x25_lapb_receive_frame+0x19d/0xf20 net/x25/x25_dev.c:138
 __netif_receive_skb_one_core net/core/dev.c:5551 [inline]
 netif_receive_skb_core+0x149/0x210 net/core/dev.c:5576
 lapbeth_napi_poll+0x3e/0x80 drivers/net/wan/lapbether.c:99
 __napi_poll+0xbb/0x430 net/core/dev.c:7101
 napi_poll net/core/dev.c:7168 [inline]
 net_rx_action+0x522/0xa80 net/core/dev.c:7258
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
 smpboot_thread_fn+0x520/0x990 kernel/smpboot.c:164
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
BUG: sleeping function called from invalid context at net/core/sock.c:3261
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 20, name: ksoftirqd/1
INFO: lockdep is turned off.
Preemption disabled at:
[<ffffffff81492a7d>] softirq_handle_begin kernel/softirq.c:414 [inline]
[<ffffffff81492a7d>] handle_softirqs+0xfd/0x830 kernel/softirq.c:552
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 ___might_sleep+0x493/0x610 kernel/sched/core.c:9658
 lock_sock_nested+0x5b/0x100 net/core/sock.c:3261
 lock_sock include/net/sock.h:1744 [inline]
 x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1777
 x25_lapb_receive_frame+0x19d/0xf20 net/x25/x25_dev.c:138
 __netif_receive_skb_one_core net/core/dev.c:5551 [inline]
 netif_receive_skb_core+0x149/0x210 net/core/dev.c:5576
 lapbeth_napi_poll+0x3e/0x80 drivers/net/wan/lapbether.c:99
 __napi_poll+0xbb/0x430 net/core/dev.c:7101
 napi_poll net/core/dev.c:7168 [inline]
 net_rx_action+0x522/0xa80 net/core/dev.c:7258
 handle_softirqs+0x336/0x830 kernel/softirq.c:576
 run_ksoftirqd+0xa4/0x100 kernel/softirq.c:943
 smpboot_thread_fn+0x520/0x990 kernel/smpboot.c:164
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>