================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.2.171/7064 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888022792260 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline] ffff888022792260 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1775 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 lock_sock_nested+0x41/0x100 net/core/sock.c:3837 lock_sock include/net/sock.h:1713 [inline] x25_release+0xa0/0x3d0 net/x25/af_x25.c:629 __sock_release+0xa0/0x1f0 net/socket.c:735 sock_close+0x1c/0x30 net/socket.c:1529 __fput+0x413/0xa50 fs/file_table.c:513 fput_close_sync+0x11f/0x240 fs/file_table.c:618 filp_close_sync+0x6e/0xa0 fs/open.c:1573 close_files fs/file.c:572 [inline] put_files_struct+0x230/0x3c0 fs/file.c:584 do_exit+0x6f0/0x2380 kernel/exit.c:977 do_group_exit+0x22d/0x2f0 kernel/exit.c:1123 get_signal+0x1216/0x12c0 kernel/signal.c:3112 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline] exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline] do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 83862 hardirqs last enabled at (83862): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (83861): [] __local_bh_enable_ip+0x72/0x140 kernel/softirq.c:455 softirqs last enabled at (79530): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last enabled at (79530): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last enabled at (79530): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 softirqs last disabled at (83773): [] __do_softirq kernel/softirq.c:679 [inline] softirqs last disabled at (83773): [] invoke_softirq kernel/softirq.c:519 [inline] softirqs last disabled at (83773): [] __irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758 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 syz.2.171/7064: 2, last CPU#0: #0: ffff8880315216f0 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x1e3/0xd70 net/unix/af_unix.c:2587 #1: ffffffff8ed5a3a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #1: ffffffff8ed5a3a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffffff8ed5a3a0 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6357 stack backtrace: CPU: 0 UID: 0 PID: 7064 Comm: syz.2.171 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_usage_bug+0x28c/0x2e0 kernel/locking/lockdep.c:4086 valid_state+0xbe/0xf0 kernel/locking/lockdep.c:4100 mark_lock_irq+0x36/0x380 kernel/locking/lockdep.c:4311 mark_lock+0x117/0x190 kernel/locking/lockdep.c:4797 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0x71e/0x2de0 kernel/locking/lockdep.c:5242 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942 lock_sock_nested+0x41/0x100 net/core/sock.c:3837 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1775 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6333 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6358 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7866 napi_poll net/core/dev.c:7929 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8086 handle_softirqs+0x223/0x840 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:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 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:__static_cpu_has arch/x86/include/asm/cpufeature.h:101 [inline] RIP: 0010:addr_has_metadata mm/kasan/kasan.h:334 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:188 [inline] RIP: 0010:kasan_check_range+0x30/0x2c0 mm/kasan/generic.c:200 Code: 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ae 01 00 00 4c 8d 04 37 49 39 f8 0f 82 36 02 00 00 49 b9 00 00 00 00 00 80 ff ff 0d cc cc cc 49 b9 00 00 00 00 00 00 00 ff 4c 39 cf 0f 82 14 02 RSP: 0018:ffffc900037c76e8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff888031521160 RCX: ffffffff8a8af362 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888031521160 RBP: ffffc900037c7898 R08: ffff888031521168 R09: ffff800000000000 R10: dffffc0000000000 R11: fffffbfff20f3638 R12: ffff888075471000 R13: dffffc0000000000 R14: 1ffff920006f8ef0 R15: ffff888031521100 instrument_atomic_read include/linux/instrumented.h:82 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] sock_flag include/net/sock.h:1061 [inline] __unix_dgram_recvmsg+0x6a2/0xd70 net/unix/af_unix.c:2636 sock_recvmsg_nosec+0x130/0x170 net/socket.c:1154 ____sys_recvmsg+0x3e3/0x4a0 net/socket.c:2933 ___sys_recvmsg+0x213/0x5a0 net/socket.c:2977 do_recvmmsg+0x31a/0x7f0 net/socket.c:3072 __sys_recvmmsg net/socket.c:3146 [inline] __do_sys_recvmmsg net/socket.c:3169 [inline] __se_sys_recvmmsg net/socket.c:3162 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3162 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 RIP: 0033:0x7fc89859e159 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:00007fc8993bd028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fc898826090 RCX: 00007fc89859e159 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000006 RBP: 00007fc89863506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc898826128 R14: 00007fc898826090 R15: 00007ffd2e8cfb18 BUG: sleeping function called from invalid context at net/core/sock.c:3839 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 7064, name: syz.2.171 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:486 [inline] [] handle_softirqs+0xab/0x840 kernel/softirq.c:621 CPU: 0 UID: 0 PID: 7064 Comm: syz.2.171 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9197 lock_sock_nested+0x56/0x100 net/core/sock.c:3839 lock_sock include/net/sock.h:1713 [inline] x25_kill_by_neigh+0x10d/0x250 net/x25/af_x25.c:1775 x25_lapb_receive_frame+0x1b0/0xfb0 net/x25/x25_dev.c:138 __netif_receive_skb_one_core net/core/dev.c:6333 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6358 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7866 napi_poll net/core/dev.c:7929 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8086 handle_softirqs+0x223/0x840 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:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 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:__static_cpu_has arch/x86/include/asm/cpufeature.h:101 [inline] RIP: 0010:addr_has_metadata mm/kasan/kasan.h:334 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:188 [inline] RIP: 0010:kasan_check_range+0x30/0x2c0 mm/kasan/generic.c:200 Code: 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ae 01 00 00 4c 8d 04 37 49 39 f8 0f 82 36 02 00 00 49 b9 00 00 00 00 00 80 ff ff 0d cc cc cc 49 b9 00 00 00 00 00 00 00 ff 4c 39 cf 0f 82 14 02 RSP: 0018:ffffc900037c76e8 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff888031521160 RCX: ffffffff8a8af362 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888031521160 RBP: ffffc900037c7898 R08: ffff888031521168 R09: ffff800000000000 R10: dffffc0000000000 R11: fffffbfff20f3638 R12: ffff888075471000 R13: dffffc0000000000 R14: 1ffff920006f8ef0 R15: ffff888031521100 instrument_atomic_read include/linux/instrumented.h:82 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] sock_flag include/net/sock.h:1061 [inline] __unix_dgram_recvmsg+0x6a2/0xd70 net/unix/af_unix.c:2636 sock_recvmsg_nosec+0x130/0x170 net/socket.c:1154 ____sys_recvmsg+0x3e3/0x4a0 net/socket.c:2933 ___sys_recvmsg+0x213/0x5a0 net/socket.c:2977 do_recvmmsg+0x31a/0x7f0 net/socket.c:3072 __sys_recvmmsg net/socket.c:3146 [inline] __do_sys_recvmmsg net/socket.c:3169 [inline] __se_sys_recvmmsg net/socket.c:3162 [inline] __x64_sys_recvmmsg+0x198/0x250 net/socket.c:3162 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 RIP: 0033:0x7fc89859e159 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:00007fc8993bd028 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fc898826090 RCX: 00007fc89859e159 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000006 RBP: 00007fc89863506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc898826128 R14: 00007fc898826090 R15: 00007ffd2e8cfb18 ---------------- Code disassembly (best guess): 0: 57 push %rdi 1: 41 56 push %r14 3: 41 55 push %r13 5: 41 54 push %r12 7: 53 push %rbx 8: b0 01 mov $0x1,%al a: 48 85 f6 test %rsi,%rsi d: 0f 84 ae 01 00 00 je 0x1c1 13: 4c 8d 04 37 lea (%rdi,%rsi,1),%r8 17: 49 39 f8 cmp %rdi,%r8 1a: 0f 82 36 02 00 00 jb 0x256 20: 49 b9 00 00 00 00 00 movabs $0xffff800000000000,%r9 27: 80 ff ff * 2a: eb 0d jmp 0x39 <-- trapping instruction 2c: cc int3 2d: cc int3 2e: cc int3 2f: 49 b9 00 00 00 00 00 movabs $0xff00000000000000,%r9 36: 00 00 ff 39: 4c 39 cf cmp %r9,%rdi 3c: 0f .byte 0xf 3d: 82 (bad) 3e: 14 02 adc $0x2,%al