================================ WARNING: inconsistent lock state syzkaller #0 Tainted: G L -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. kworker/1:1/30 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807e95a260 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff88807e95a260 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 lock_sock_nested+0x41/0x100 net/core/sock.c:3827 lock_sock include/net/sock.h:1713 [inline] x25_connect+0x5c/0x8f0 net/x25/af_x25.c:751 __sys_connect_file net/socket.c:2160 [inline] __sys_connect+0x323/0x460 net/socket.c:2179 __do_sys_connect net/socket.c:2185 [inline] __se_sys_connect net/socket.c:2182 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2182 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 650422 hardirqs last enabled at (650422): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (650421): [] __local_bh_enable_ip+0x72/0x140 kernel/softirq.c:455 softirqs last enabled at (650350): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last enabled at (650350): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last enabled at (650350): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 softirqs last disabled at (650353): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (650353): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (650353): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sk_lock-AF_X25); lock(sk_lock-AF_X25); *** DEADLOCK *** locks held by kworker/1:1/30: 1, last CPU#1: #0: ffffffff8eb5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #0: ffffffff8eb5c8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8eb5c8a0 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6269 stack backtrace: CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: 0x0 (events) Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28c/0x2e0 kernel/locking/lockdep.c:4058 valid_state+0xbe/0xf0 kernel/locking/lockdep.c:4072 mark_lock_irq+0x36/0x380 kernel/locking/lockdep.c:4283 mark_lock+0x117/0x190 kernel/locking/lockdep.c:4769 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0x6b7/0x2e50 kernel/locking/lockdep.c:5208 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5908 lock_sock_nested+0x41/0x100 net/core/sock.c:3827 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6245 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6270 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7768 napi_poll net/core/dev.c:7831 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7988 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__schedule+0x0/0x59e0 kernel/sched/core.c:7067 Code: d9 48 8b 5c 24 10 e9 f4 fe ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc90000a67cb8 EFLAGS: 00000246 RAX: 1ffff11003f5aa84 RBX: ffff88801fad3e80 RCX: ffffffff9a7aa500 RDX: 0000000000000001 RSI: ffffffff8c4c9460 RDI: 0000000000000000 RBP: 1ffff11003f5a7d3 R08: ffffffff9059037f R09: 1ffffffff20b206f R10: dffffc0000000000 R11: fffffbfff20b2070 R12: ffff88801fad3eac R13: dffffc0000000000 R14: 1ffff11003f5a7d0 R15: ffff88801fad51c8 __schedule_loop kernel/sched/core.c:7317 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7332 worker_thread+0xc12/0xfb0 kernel/workqueue.c:3566 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 BUG: sleeping function called from invalid context at net/core/sock.c:3829 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 30, name: kworker/1:1 preempt_count: 101, expected: 0 RCU nest depth: 1, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [] __schedule_loop kernel/sched/core.c:7316 [inline] [] schedule+0x15d/0x2b0 kernel/sched/core.c:7332 CPU: 1 UID: 0 PID: 30 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: 0x0 (events) Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9203 lock_sock_nested+0x56/0x100 net/core/sock.c:3829 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1778 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6245 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6270 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7768 napi_poll net/core/dev.c:7831 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:7988 handle_softirqs+0x226/0x860 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:767 irq_exit_rcu+0x9/0x30 kernel/softirq.c:784 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:__schedule+0x0/0x59e0 kernel/sched/core.c:7067 Code: d9 48 8b 5c 24 10 e9 f4 fe ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc90000a67cb8 EFLAGS: 00000246 RAX: 1ffff11003f5aa84 RBX: ffff88801fad3e80 RCX: ffffffff9a7aa500 RDX: 0000000000000001 RSI: ffffffff8c4c9460 RDI: 0000000000000000 RBP: 1ffff11003f5a7d3 R08: ffffffff9059037f R09: 1ffffffff20b206f R10: dffffc0000000000 R11: fffffbfff20b2070 R12: ffff88801fad3eac R13: dffffc0000000000 R14: 1ffff11003f5a7d0 R15: ffff88801fad51c8 __schedule_loop kernel/sched/core.c:7317 [inline] schedule+0x164/0x2b0 kernel/sched/core.c:7332 worker_thread+0xc12/0xfb0 kernel/workqueue.c:3566 kthread+0x38b/0x480 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: d9 48 8b (bad) -0x75(%rax) 3: 5c pop %rsp 4: 24 10 and $0x10,%al 6: e9 f4 fe ff ff jmp 0xfffffeff b: cc int3 c: cc int3 d: cc int3 e: cc int3 f: cc int3 10: cc int3 11: cc int3 12: cc int3 13: cc int3 14: cc int3 15: cc int3 16: cc int3 17: cc int3 18: cc int3 19: cc int3 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 55 push %rbp 2f: 48 89 e5 mov %rsp,%rbp 32: 41 57 push %r15 34: 41 56 push %r14 36: 41 55 push %r13 38: 41 54 push %r12 3a: 53 push %rbx 3b: 48 83 e4 e0 and $0xffffffffffffffe0,%rsp 3f: 48 rex.W