================================ 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: ffff88807b04e130 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1780 [inline] ffff88807b04e130 (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_release+0xa0/0x3a0 net/x25/af_x25.c:636 __sock_release net/socket.c:659 [inline] sock_close+0xa7/0x210 net/socket.c:1421 __fput+0x221/0x940 fs/file_table.c:418 task_work_run+0x1d4/0x260 kernel/task_work.c:245 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 6490148 hardirqs last enabled at (6490148): [] __local_bh_enable_ip+0x13a/0x1c0 kernel/softirq.c:411 hardirqs last disabled at (6490147): [] __local_bh_enable_ip+0xdb/0x1c0 kernel/softirq.c:388 softirqs last enabled at (6490036): [] run_ksoftirqd+0xa8/0x100 kernel/softirq.c:950 softirqs last disabled at (6490059): [] run_ksoftirqd+0xa8/0x100 kernel/softirq.c:950 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 run_ksoftirqd+0xa8/0x100 kernel/softirq.c:950 smpboot_thread_fn+0x651/0x9f0 kernel/smpboot.c:164 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: 100, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] softirq_handle_begin kernel/softirq.c:419 [inline] [] handle_softirqs+0x101/0x820 kernel/softirq.c:554 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 run_ksoftirqd+0xa8/0x100 kernel/softirq.c:950 smpboot_thread_fn+0x651/0x9f0 kernel/smpboot.c:164 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