================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.1.275/5212 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807b36e120 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] ffff88807b36e120 (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: 113456 hardirqs last enabled at (113456): [] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:406 hardirqs last disabled at (113455): [] __local_bh_enable_ip+0xd7/0x1c0 kernel/softirq.c:383 softirqs last enabled at (111964): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last enabled at (111964): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last enabled at (111964): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 softirqs last disabled at (113251): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (113251): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (113251): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 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 syz.1.275/5212: #0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313 stack backtrace: CPU: 1 PID: 5212 Comm: syz.1.275 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: 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 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:finish_lock_switch+0x135/0x290 kernel/sched/core.c:4804 Code: ff ff e8 6e cb 6b 08 85 c0 74 46 4d 85 ff 75 62 0f 1f 44 00 00 48 89 df e8 98 3a 75 08 e8 43 d7 2a 00 fb 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 48 89 df e8 2f 0e fe ff 43 80 3c 2c 00 74 08 4c 89 f7 RSP: 0018:ffffc900038ef2f0 EFLAGS: 00000286 RAX: 4d710874b9db2700 RBX: ffff88801db11dc0 RCX: 4d710874b9db2700 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200 RBP: 1ffff11017227613 R08: ffff8880b913a343 R09: 1ffff11017227468 R10: dffffc0000000000 R11: ffffed1017227469 R12: ffff88801db11df4 R13: dffffc0000000000 R14: ffff88807abc8700 R15: 0000000000000000 finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921 context_switch kernel/sched/core.c:5052 [inline] __schedule+0x11cb/0x4350 kernel/sched/core.c:6395 schedule+0x11b/0x1e0 kernel/sched/core.c:6478 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093 unix_wait_for_peer+0x1f2/0x2e0 net/unix/af_unix.c:1315 unix_dgram_sendmsg+0x115c/0x19c0 net/unix/af_unix.c:1910 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmmsg+0x2ba/0x500 net/socket.c:2586 __do_sys_sendmmsg net/socket.c:2615 [inline] __se_sys_sendmmsg net/socket.c:2612 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2612 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 RIP: 0033:0x7ff4112c70d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff40f51f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007ff41154efa0 RCX: 00007ff4112c70d9 RDX: 0000000000000651 RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007ff41135e024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff41154f038 R14: 00007ff41154efa0 R15: 00007ffe683cff08 BUG: sleeping function called from invalid context at net/core/sock.c:3261 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5212, name: syz.1.275 INFO: lockdep is turned off. Preemption disabled at: [] schedule+0x114/0x1e0 kernel/sched/core.c:6477 CPU: 1 PID: 5212 Comm: syz.1.275 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: 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 __do_softirq kernel/softirq.c:610 [inline] invoke_softirq kernel/softirq.c:450 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:659 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676 RIP: 0010:finish_lock_switch+0x135/0x290 kernel/sched/core.c:4804 Code: ff ff e8 6e cb 6b 08 85 c0 74 46 4d 85 ff 75 62 0f 1f 44 00 00 48 89 df e8 98 3a 75 08 e8 43 d7 2a 00 fb 5b 41 5c 41 5d 41 5e <41> 5f 5d c3 48 89 df e8 2f 0e fe ff 43 80 3c 2c 00 74 08 4c 89 f7 RSP: 0018:ffffc900038ef2f0 EFLAGS: 00000286 RAX: 4d710874b9db2700 RBX: ffff88801db11dc0 RCX: 4d710874b9db2700 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: ffffffff8a7a4200 RBP: 1ffff11017227613 R08: ffff8880b913a343 R09: 1ffff11017227468 R10: dffffc0000000000 R11: ffffed1017227469 R12: ffff88801db11df4 R13: dffffc0000000000 R14: ffff88807abc8700 R15: 0000000000000000 finish_task_switch+0x12f/0x650 kernel/sched/core.c:4921 context_switch kernel/sched/core.c:5052 [inline] __schedule+0x11cb/0x4350 kernel/sched/core.c:6395 schedule+0x11b/0x1e0 kernel/sched/core.c:6478 schedule_timeout+0xbd/0x2d0 kernel/time/timer.c:2093 unix_wait_for_peer+0x1f2/0x2e0 net/unix/af_unix.c:1315 unix_dgram_sendmsg+0x115c/0x19c0 net/unix/af_unix.c:1910 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2446 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2500 __sys_sendmmsg+0x2ba/0x500 net/socket.c:2586 __do_sys_sendmmsg net/socket.c:2615 [inline] __se_sys_sendmmsg net/socket.c:2612 [inline] __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2612 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 RIP: 0033:0x7ff4112c70d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff40f51f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007ff41154efa0 RCX: 00007ff4112c70d9 RDX: 0000000000000651 RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007ff41135e024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff41154f038 R14: 00007ff41154efa0 R15: 00007ffe683cff08 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: ff ljmp (bad) 1: e8 6e cb 6b 08 call 0x86bcb74 6: 85 c0 test %eax,%eax 8: 74 46 je 0x50 a: 4d 85 ff test %r15,%r15 d: 75 62 jne 0x71 f: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 14: 48 89 df mov %rbx,%rdi 17: e8 98 3a 75 08 call 0x8753ab4 1c: e8 43 d7 2a 00 call 0x2ad764 21: fb sti 22: 5b pop %rbx 23: 41 5c pop %r12 25: 41 5d pop %r13 27: 41 5e pop %r14 * 29: 41 5f pop %r15 <-- trapping instruction 2b: 5d pop %rbp 2c: c3 ret 2d: 48 89 df mov %rbx,%rdi 30: e8 2f 0e fe ff call 0xfffe0e64 35: 43 80 3c 2c 00 cmpb $0x0,(%r12,%r13,1) 3a: 74 08 je 0x44 3c: 4c 89 f7 mov %r14,%rdi