================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.1.1208/9393 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888072da4130 (sk_lock-AF_X25){+.?.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline] ffff888072da4130 (sk_lock-AF_X25){+.?.}-{0:0}, at: x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1781 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 lock_sock_nested+0x44/0x100 net/core/sock.c:3505 lock_sock include/net/sock.h:1805 [inline] x25_ioctl+0x200/0xe20 net/x25/af_x25.c:1601 sock_do_ioctl+0xfb/0x320 net/socket.c:1202 sock_ioctl+0x48a/0x700 net/socket.c:1321 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856 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: 24704 hardirqs last enabled at (24704): [] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:426 hardirqs last disabled at (24703): [] __local_bh_enable_ip+0xd7/0x1c0 kernel/softirq.c:403 softirqs last enabled at (21594): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (21594): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (21594): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (24609): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (24609): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (24609): [] __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 *** 4 locks held by syz.1.1208/9393: #0: ffff88807943c4d8 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff88807943c4d8 (&mm->mmap_lock){++++}-{3:3}, at: __mm_populate+0x17f/0x380 mm/gup.c:1700 #1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #1: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: filemap_map_pages+0x1ae/0x11e0 mm/filemap.c:3471 #2: ffff88801db8f1f8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #2: ffff88801db8f1f8 (ptlock_ptr(page)#2){+.+.}-{2:2}, at: filemap_map_pages+0x91e/0x11e0 mm/filemap.c:3482 #3: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline] #3: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline] #3: ffffffff8cb2db60 (rcu_read_lock){....}-{1:2}, at: netif_receive_skb_core+0x30/0x230 net/core/dev.c:5643 stack backtrace: CPU: 0 PID: 9393 Comm: syz.1.1208 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:5676 lock_sock_nested+0x44/0x100 net/core/sock.c:3505 lock_sock include/net/sock.h:1805 [inline] x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1781 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:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5680 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc900065df700 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 98f5f64e0f7b8300 RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adf5de0 RBP: ffffc900065df818 R08: dffffc0000000000 R09: 1ffffffff2162048 R10: dffffc0000000000 R11: fffffbfff2162049 R12: 0000000000000000 R13: 1ffff92000cbbeec R14: 0000000000000246 R15: dffffc0000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] filemap_map_pages+0x91e/0x11e0 mm/filemap.c:3482 do_fault_around mm/memory.c:4598 [inline] do_read_fault mm/memory.c:4624 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x25e5/0x3d40 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x40d/0xec0 mm/gup.c:1250 populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607 __mm_populate+0x25c/0x380 mm/gup.c:1721 mm_populate include/linux/mm.h:2891 [inline] vm_mmap_pgoff+0x212/0x2d0 mm/util.c:525 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: 0033:0x7f43cbf9e019 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:00007f43cceeb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f43cc225fa0 RCX: 00007f43cbf9e019 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f43cc03500c R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f43cc226038 R14: 00007f43cc225fa0 R15: 00007ffd318523d8 BUG: sleeping function called from invalid context at net/core/sock.c:3507 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 9393, name: syz.1.1208 preempt_count: 101, expected: 0 RCU nest depth: 2, expected: 0 INFO: lockdep is turned off. Preemption disabled at: [<0000000000000000>] 0x0 CPU: 0 PID: 9393 Comm: syz.1.1208 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:3507 lock_sock include/net/sock.h:1805 [inline] x25_kill_by_neigh+0x83/0x120 net/x25/af_x25.c:1781 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:lock_acquire+0x225/0x4a0 kernel/locking/lockdep.c:5680 Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3d 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 44 3d 00 00 00 00 00 43 c7 44 3d 08 00 00 00 00 65 48 8b 04 RSP: 0018:ffffc900065df700 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000000 RCX: 98f5f64e0f7b8300 RDX: 0000000000000000 RSI: ffffffff8a8c2920 RDI: ffffffff8adf5de0 RBP: ffffc900065df818 R08: dffffc0000000000 R09: 1ffffffff2162048 R10: dffffc0000000000 R11: fffffbfff2162049 R12: 0000000000000000 R13: 1ffff92000cbbeec R14: 0000000000000246 R15: dffffc0000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] filemap_map_pages+0x91e/0x11e0 mm/filemap.c:3482 do_fault_around mm/memory.c:4598 [inline] do_read_fault mm/memory.c:4624 [inline] do_fault mm/memory.c:4758 [inline] handle_pte_fault mm/memory.c:5029 [inline] __handle_mm_fault mm/memory.c:5171 [inline] handle_mm_fault+0x25e5/0x3d40 mm/memory.c:5292 faultin_page mm/gup.c:1026 [inline] __get_user_pages+0x40d/0xec0 mm/gup.c:1250 populate_vma_page_range+0x214/0x2b0 mm/gup.c:1607 __mm_populate+0x25c/0x380 mm/gup.c:1721 mm_populate include/linux/mm.h:2891 [inline] vm_mmap_pgoff+0x212/0x2d0 mm/util.c:525 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: 0033:0x7f43cbf9e019 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:00007f43cceeb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f43cc225fa0 RCX: 00007f43cbf9e019 RDX: b635773f06ebbeee RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f43cc03500c R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f43cc226038 R14: 00007f43cc225fa0 R15: 00007ffd318523d8 ---------------- Code disassembly (best guess): 0: f7 84 24 80 00 00 00 testl $0x200,0x80(%rsp) 7: 00 02 00 00 b: 43 c6 44 3d 04 f8 movb $0xf8,0x4(%r13,%r15,1) 11: 0f 85 f0 00 00 00 jne 0x107 17: 41 f7 c6 00 02 00 00 test $0x200,%r14d 1e: 74 01 je 0x21 20: fb sti 21: 48 c7 44 24 60 0e 36 movq $0x45e0360e,0x60(%rsp) 28: e0 45 * 2a: 4b c7 44 3d 00 00 00 movq $0x0,0x0(%r13,%r15,1) <-- trapping instruction 31: 00 00 33: 43 c7 44 3d 08 00 00 movl $0x0,0x8(%r13,%r15,1) 3a: 00 00 3c: 65 gs 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 04 .byte 0x4