================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz-executor/5626 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88805399a260 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1717 [inline] ffff88805399a260 (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:3908 lock_sock include/net/sock.h:1717 [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+0x408/0xa40 fs/file_table.c:512 fput_close_sync+0x11f/0x240 fs/file_table.c:618 filp_close_sync+0x6e/0xa0 fs/open.c:1573 __range_close fs/file.c:919 [inline] __do_sys_close_range fs/file.c:1003 [inline] __se_sys_close_range+0xa77/0xef0 fs/file.c:954 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: 2315690 hardirqs last enabled at (2315690): [] __local_bh_enable_ip+0xd6/0x140 kernel/softirq.c:478 hardirqs last disabled at (2315689): [] __local_bh_enable_ip+0x72/0x140 kernel/softirq.c:455 softirqs last enabled at (2315624): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last enabled at (2315624): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last enabled at (2315624): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 softirqs last disabled at (2315631): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (2315631): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (2315631): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 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-executor/5626: 8, last CPU#1: #0: ffffffff8fe33fd0 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1542 [inline] #0: ffffffff8fe33fd0 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10a/0x470 kernel/fork.c:1595 #1: ffff88807f546540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline] #1: ffff88807f546540 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0 mm/mmap.c:1716 #2: ffff88807f188f80 (&mm->mmap_lock/1){+.+.}-{4:4}, at: mmap_write_lock_nested include/linux/mmap_lock.h:552 [inline] #2: ffff88807f188f80 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0 mm/mmap.c:1723 #3: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #3: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #3: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 mm/pgtable-generic.c:290 #4: ffff888032f922b8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:347 [inline] #4: ffff888032f922b8 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210 mm/pgtable-generic.c:404 #5: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #5: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #5: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240 mm/pgtable-generic.c:290 #6: ffff8880353a3af8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pte_range mm/memory.c:1354 [inline] #6: ffff8880353a3af8 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c00 mm/memory.c:1490 #7: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline] #7: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #7: ffffffff8fd59ca0 (rcu_read_lock){....}-{1:3}, at: netif_receive_skb_core+0x33/0x2b0 net/core/dev.c:6449 stack backtrace: CPU: 1 UID: 0 PID: 5626 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 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:3908 lock_sock include/net/sock.h:1717 [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:6425 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6450 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7958 napi_poll net/core/dev.c:8021 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8178 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 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:copy_pte_range arch/x86/include/asm/bitops.h:-1 [inline] RIP: 0010:copy_pmd_range+0x9a2/0x5c00 mm/memory.c:1490 Code: 01 0f 85 d8 4e 00 00 4c 89 ef be 08 00 00 00 e8 94 ef 18 00 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 0e ed 18 00 <48> 8b 5c 24 38 48 2b 5c 24 48 48 c1 eb 0c 4d 8b 75 00 41 83 e6 40 RSP: 0018:ffffc90003f0f2e0 EFLAGS: 00000246 RAX: 1ffffd400034cff8 RBX: 0000000000000000 RCX: ffffffff822070ac RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0001a67fc0 RBP: ffffc90003f0f570 R08: ffffea0001a67fc7 R09: 1ffffd400034cff8 R10: dffffc0000000000 R11: fffff9400034cff9 R12: ffffea0001a67fc0 R13: ffffea0001a67fc0 R14: 80000000699ff007 R15: dffffc0000000000 copy_pud_range mm/memory.c:1527 [inline] copy_p4d_range mm/memory.c:1551 [inline] copy_page_range+0xc7d/0x1280 mm/memory.c:1637 dup_mmap+0xf17/0x1dc0 mm/mmap.c:1819 dup_mm kernel/fork.c:1543 [inline] copy_mm+0x115/0x470 kernel/fork.c:1595 copy_process+0x1ecc/0x44b0 kernel/fork.c:2321 kernel_clone+0x2d7/0x940 kernel/fork.c:2785 __do_sys_clone kernel/fork.c:2927 [inline] __se_sys_clone kernel/fork.c:2911 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2911 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: 0033:0x7f527c7c7fd2 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffede113850 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffede113850 RCX: 00007f527c7c7fd2 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffede1139dc R08: 0000000000000000 R09: 0000000000000001 R10: 000055555add07d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000049de8 R15: 00007ffede113a30 BUG: sleeping function called from invalid context at net/core/sock.c:3910 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5626, name: syz-executor preempt_count: 102, expected: 0 RCU nest depth: 3, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 1 UID: 0 PID: 5626 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 __might_resched+0x36a/0x4c0 kernel/sched/core.c:9195 lock_sock_nested+0x56/0x100 net/core/sock.c:3910 lock_sock include/net/sock.h:1717 [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:6425 [inline] netif_receive_skb_core+0x2a6/0x2b0 net/core/dev.c:6450 lapbeth_napi_poll+0x42/0x90 drivers/net/wan/lapbether.c:100 __napi_poll+0xaa/0x330 net/core/dev.c:7958 napi_poll net/core/dev.c:8021 [inline] net_rx_action+0x61d/0xf50 net/core/dev.c:8178 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 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:copy_pte_range arch/x86/include/asm/bitops.h:-1 [inline] RIP: 0010:copy_pmd_range+0x9a2/0x5c00 mm/memory.c:1490 Code: 01 0f 85 d8 4e 00 00 4c 89 ef be 08 00 00 00 e8 94 ef 18 00 4c 89 e8 48 c1 e8 03 42 80 3c 38 00 74 08 4c 89 ef e8 0e ed 18 00 <48> 8b 5c 24 38 48 2b 5c 24 48 48 c1 eb 0c 4d 8b 75 00 41 83 e6 40 RSP: 0018:ffffc90003f0f2e0 EFLAGS: 00000246 RAX: 1ffffd400034cff8 RBX: 0000000000000000 RCX: ffffffff822070ac RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0001a67fc0 RBP: ffffc90003f0f570 R08: ffffea0001a67fc7 R09: 1ffffd400034cff8 R10: dffffc0000000000 R11: fffff9400034cff9 R12: ffffea0001a67fc0 R13: ffffea0001a67fc0 R14: 80000000699ff007 R15: dffffc0000000000 copy_pud_range mm/memory.c:1527 [inline] copy_p4d_range mm/memory.c:1551 [inline] copy_page_range+0xc7d/0x1280 mm/memory.c:1637 dup_mmap+0xf17/0x1dc0 mm/mmap.c:1819 dup_mm kernel/fork.c:1543 [inline] copy_mm+0x115/0x470 kernel/fork.c:1595 copy_process+0x1ecc/0x44b0 kernel/fork.c:2321 kernel_clone+0x2d7/0x940 kernel/fork.c:2785 __do_sys_clone kernel/fork.c:2927 [inline] __se_sys_clone kernel/fork.c:2911 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2911 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: 0033:0x7f527c7c7fd2 Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00 RSP: 002b:00007ffede113850 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ffede113850 RCX: 00007f527c7c7fd2 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011 RBP: 00007ffede1139dc R08: 0000000000000000 R09: 0000000000000001 R10: 000055555add07d0 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000000927c0 R14: 0000000000049de8 R15: 00007ffede113a30 ---------------- Code disassembly (best guess): 0: 01 0f add %ecx,(%rdi) 2: 85 d8 test %ebx,%eax 4: 4e 00 00 rex.WRX add %r8b,(%rax) 7: 4c 89 ef mov %r13,%rdi a: be 08 00 00 00 mov $0x8,%esi f: e8 94 ef 18 00 call 0x18efa8 14: 4c 89 e8 mov %r13,%rax 17: 48 c1 e8 03 shr $0x3,%rax 1b: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 20: 74 08 je 0x2a 22: 4c 89 ef mov %r13,%rdi 25: e8 0e ed 18 00 call 0x18ed38 * 2a: 48 8b 5c 24 38 mov 0x38(%rsp),%rbx <-- trapping instruction 2f: 48 2b 5c 24 48 sub 0x48(%rsp),%rbx 34: 48 c1 eb 0c shr $0xc,%rbx 38: 4d 8b 75 00 mov 0x0(%r13),%r14 3c: 41 83 e6 40 and $0x40,%r14d