================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.0.817/7340 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88802ebd0130 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline] ffff88802ebd0130 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x109/0x250 net/x25/af_x25.c:1783 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 lock_sock_nested+0x44/0x100 net/core/sock.c:3504 lock_sock include/net/sock.h:1805 [inline] x25_bind+0x1aa/0x3e0 net/x25/af_x25.c:698 __sys_bind+0x2e9/0x3e0 net/socket.c:1811 __do_sys_bind net/socket.c:1822 [inline] __se_sys_bind net/socket.c:1820 [inline] __x64_sys_bind+0x76/0x80 net/socket.c:1820 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 743252 hardirqs last enabled at (743252): [] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:426 hardirqs last disabled at (743251): [] __local_bh_enable_ip+0xd7/0x1c0 kernel/softirq.c:403 softirqs last enabled at (733060): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (733060): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (733060): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (743101): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (743101): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (743101): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 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.0.817/7340: #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #0: ffffffff8cb2d7e0 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_core+0x30/0x230 net/core/dev.c:5643 stack backtrace: CPU: 1 PID: 7340 Comm: syz.0.817 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 valid_state+0x13b/0x1d0 kernel/locking/lockdep.c:3974 mark_lock_irq+0xa9/0x900 kernel/locking/lockdep.c:4177 mark_lock+0x208/0x320 kernel/locking/lockdep.c:4633 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0xce0/0x7c40 kernel/locking/lockdep.c:5017 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5678 lock_sock_nested+0x44/0x100 net/core/sock.c:3504 lock_sock include/net/sock.h:1805 [inline] x25_kill_by_neigh+0x109/0x250 net/x25/af_x25.c:1783 x25_lapb_receive_frame+0x1a3/0xf20 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:5619 [inline] netif_receive_skb_core+0x166/0x230 net/core/dev.c:5644 lapbeth_napi_poll+0x3e/0x80 drivers/net/wan/lapbether.c:99 __napi_poll+0xbb/0x460 net/core/dev.c:6628 napi_poll net/core/dev.c:6695 [inline] net_rx_action+0x622/0xbc0 net/core/dev.c:6809 handle_softirqs+0x291/0x910 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5125 Code: d9 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 e9 e7 04 00 00 4c 89 e7 e8 93 20 e3 08 e8 1e 18 2f 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:ffffc900038576e0 EFLAGS: 00000282 RAX: d61f1aad2b4e6300 RBX: 0000000000000000 RCX: d61f1aad2b4e6300 RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0 RBP: ffffc90003857730 R08: ffff8880b8e3acc3 R09: 1ffff110171c7598 R10: dffffc0000000000 R11: ffffed10171c7599 R12: ffff88802aa40000 R13: ffff8880b8f3ba08 R14: dffffc0000000000 R15: ffff8880b8f3b790 context_switch kernel/sched/core.c:5249 [inline] __schedule+0x1087/0x4030 kernel/sched/core.c:6563 schedule+0xb9/0x180 kernel/sched/core.c:6639 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168 snd_rawmidi_write+0x3b6/0xb90 sound/core/rawmidi.c:1605 do_loop_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x4a4/0xb10 fs/read_write.c:863 vfs_writev fs/read_write.c:934 [inline] do_writev+0x27b/0x480 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa36359e159 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:00007fa3617f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fa363825fa0 RCX: 00007fa36359e159 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000005 RBP: 00007fa36363506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa363826038 R14: 00007fa363825fa0 R15: 00007fff141310e8 BUG: sleeping function called from invalid context at net/core/sock.c:3506 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 7340, name: syz.0.817 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] schedule+0xb2/0x180 kernel/sched/core.c:6638 CPU: 1 PID: 7340 Comm: syz.0.817 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 __might_resched+0x489/0x5f0 kernel/sched/core.c:9970 lock_sock_nested+0x59/0x100 net/core/sock.c:3506 lock_sock include/net/sock.h:1805 [inline] x25_kill_by_neigh+0x109/0x250 net/x25/af_x25.c:1783 x25_lapb_receive_frame+0x1a3/0xf20 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:5619 [inline] netif_receive_skb_core+0x166/0x230 net/core/dev.c:5644 lapbeth_napi_poll+0x3e/0x80 drivers/net/wan/lapbether.c:99 __napi_poll+0xbb/0x460 net/core/dev.c:6628 napi_poll net/core/dev.c:6695 [inline] net_rx_action+0x622/0xbc0 net/core/dev.c:6809 handle_softirqs+0x291/0x910 kernel/softirq.c:596 __do_softirq kernel/softirq.c:630 [inline] invoke_softirq kernel/softirq.c:470 [inline] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline] sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691 RIP: 0010:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5125 Code: d9 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 e9 e7 04 00 00 4c 89 e7 e8 93 20 e3 08 e8 1e 18 2f 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:ffffc900038576e0 EFLAGS: 00000282 RAX: d61f1aad2b4e6300 RBX: 0000000000000000 RCX: d61f1aad2b4e6300 RDX: dffffc0000000000 RSI: ffffffff8a8c18a0 RDI: ffffffff8adf68a0 RBP: ffffc90003857730 R08: ffff8880b8e3acc3 R09: 1ffff110171c7598 R10: dffffc0000000000 R11: ffffed10171c7599 R12: ffff88802aa40000 R13: ffff8880b8f3ba08 R14: dffffc0000000000 R15: ffff8880b8f3b790 context_switch kernel/sched/core.c:5249 [inline] __schedule+0x1087/0x4030 kernel/sched/core.c:6563 schedule+0xb9/0x180 kernel/sched/core.c:6639 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2168 snd_rawmidi_write+0x3b6/0xb90 sound/core/rawmidi.c:1605 do_loop_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x4a4/0xb10 fs/read_write.c:863 vfs_writev fs/read_write.c:934 [inline] do_writev+0x27b/0x480 fs/read_write.c:977 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fa36359e159 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:00007fa3617f6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fa363825fa0 RCX: 00007fa36359e159 RDX: 0000000000000002 RSI: 0000200000000840 RDI: 0000000000000005 RBP: 00007fa36363506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa363826038 R14: 00007fa363825fa0 R15: 00007fff141310e8 ---------------- Code disassembly (best guess): 0: d9 08 (bad) (%rax) 2: 85 c0 test %eax,%eax 4: 0f 84 38 01 00 00 je 0x142 a: 48 85 db test %rbx,%rbx d: 0f 85 57 01 00 00 jne 0x16a 13: e9 e7 04 00 00 jmp 0x4ff 18: 4c 89 e7 mov %r12,%rdi 1b: e8 93 20 e3 08 call 0x8e320b3 20: e8 1e 18 2f 00 call 0x2f1843 25: fb sti 26: 4c 8b 65 b8 mov -0x48(%rbp),%r12 * 2a: 49 8d bc 24 f8 15 00 lea 0x15f8(%r12),%rdi <-- trapping instruction 31: 00 32: 48 89 f8 mov %rdi,%rax 35: 48 c1 e8 03 shr $0x3,%rax 39: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax 3e: 84 c0 test %al,%al