================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.3.529/6719 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88805de8e120 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] ffff88805de8e120 (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: 11588 hardirqs last enabled at (11588): [] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:406 hardirqs last disabled at (11587): [] __local_bh_enable_ip+0xd7/0x1c0 kernel/softirq.c:383 softirqs last enabled at (11352): [] local_bh_enable+0x5/0x20 include/linux/bottom_half.h:31 softirqs last disabled at (11371): [] __do_softirq kernel/softirq.c:610 [inline] softirqs last disabled at (11371): [] invoke_softirq kernel/softirq.c:450 [inline] softirqs last disabled at (11371): [] __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.3.529/6719: #0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x9/0x30 include/linux/rcupdate.h:313 stack backtrace: CPU: 1 PID: 6719 Comm: syz.3.529 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 1f c1 88 f7 65 8b 05 90 e8 38 76 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc9000403f980 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 07d0e2be1cde9100 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001 RBP: ffffc9000403fa10 R08: ffff8880b912a243 R09: 1ffff11017225448 R10: dffffc0000000000 R11: ffffed1017225449 R12: dffffc0000000000 R13: ffff8880b912a2c0 R14: ffff8880b912a240 R15: 1ffff92000807f30 unlock_hrtimer_base kernel/time/hrtimer.c:1002 [inline] hrtimer_try_to_cancel+0x3c0/0x420 kernel/time/hrtimer.c:1324 hrtimer_cancel+0x12/0x50 kernel/time/hrtimer.c:1443 futex_wait+0x54d/0x680 kernel/futex/core.c:2996 do_futex+0xdc2/0x12b0 kernel/futex/core.c:3983 __do_sys_futex kernel/futex/core.c:4060 [inline] __se_sys_futex+0x389/0x420 kernel/futex/core.c:4041 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: 0033:0x7f14016070d9 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:00007ffeb4071bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000002343d RCX: 00007f14016070d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f140188efac RBP: 0000000000000032 R08: 001c4891c638d5a0 R09: 0000000000000000 R10: 00007ffeb4071d00 R11: 0000000000000246 R12: 00007ffeb4071d20 R13: 00007f140188efac R14: 000000000002346f R15: 00007ffeb4071d00 BUG: sleeping function called from invalid context at net/core/sock.c:3261 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 6719, name: syz.3.529 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 PID: 6719 Comm: syz.3.529 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0xbc/0x120 kernel/locking/spinlock.c:194 Code: c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 41 c6 04 07 f8 75 4b f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 1f c1 88 f7 65 8b 05 90 e8 38 76 85 c0 74 3c 48 c7 04 24 0e 36 RSP: 0018:ffffc9000403f980 EFLAGS: 00000206 RAX: dffffc0000000004 RBX: 0000000000000a06 RCX: 07d0e2be1cde9100 RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001 RBP: ffffc9000403fa10 R08: ffff8880b912a243 R09: 1ffff11017225448 R10: dffffc0000000000 R11: ffffed1017225449 R12: dffffc0000000000 R13: ffff8880b912a2c0 R14: ffff8880b912a240 R15: 1ffff92000807f30 unlock_hrtimer_base kernel/time/hrtimer.c:1002 [inline] hrtimer_try_to_cancel+0x3c0/0x420 kernel/time/hrtimer.c:1324 hrtimer_cancel+0x12/0x50 kernel/time/hrtimer.c:1443 futex_wait+0x54d/0x680 kernel/futex/core.c:2996 do_futex+0xdc2/0x12b0 kernel/futex/core.c:3983 __do_sys_futex kernel/futex/core.c:4060 [inline] __se_sys_futex+0x389/0x420 kernel/futex/core.c:4041 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: 0033:0x7f14016070d9 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:00007ffeb4071bf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000002343d RCX: 00007f14016070d9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f140188efac RBP: 0000000000000032 R08: 001c4891c638d5a0 R09: 0000000000000000 R10: 00007ffeb4071d00 R11: 0000000000000246 R12: 00007ffeb4071d20 R13: 00007f140188efac R14: 000000000002346f R15: 00007ffeb4071d00 ---------------- Code disassembly (best guess): 0: c7 44 24 20 00 00 00 movl $0x0,0x20(%rsp) 7: 00 8: 9c pushf 9: 8f 44 24 20 pop 0x20(%rsp) d: f7 44 24 20 00 02 00 testl $0x200,0x20(%rsp) 14: 00 15: 41 c6 04 07 f8 movb $0xf8,(%r15,%rax,1) 1a: 75 4b jne 0x67 1c: f7 c3 00 02 00 00 test $0x200,%ebx 22: 74 01 je 0x25 24: fb sti 25: bf 01 00 00 00 mov $0x1,%edi * 2a: e8 1f c1 88 f7 call 0xf788c14e <-- trapping instruction 2f: 65 8b 05 90 e8 38 76 mov %gs:0x7638e890(%rip),%eax # 0x7638e8c6 36: 85 c0 test %eax,%eax 38: 74 3c je 0x76 3a: 48 rex.W 3b: c7 .byte 0xc7 3c: 04 24 add $0x24,%al 3e: 0e (bad) 3f: 36 ss