ax25_connect(): syz-executor.1 uses autobind, please contact jreuter@yaina.de ================================ WARNING: inconsistent lock state 5.2.0-rc3+ #34 Not tainted -------------------------------- inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. syz-executor.1/7957 [HC0[0]:SC0[0]:HE1:SE1] takes: 00000000aad42099 (slock-AF_AX25){+.?.}, at: spin_lock include/linux/spinlock.h:338 [inline] 00000000aad42099 (slock-AF_AX25){+.?.}, at: ax25_rt_autobind+0x3ca/0x720 net/ax25/ax25_route.c:429 {IN-SOFTIRQ-W} state was registered at: lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4303 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] ax25_destroy_timer+0x53/0xc0 net/ax25/af_ax25.c:275 call_timer_fn+0x193/0x720 kernel/time/timer.c:1322 expire_timers kernel/time/timer.c:1366 [inline] __run_timers kernel/time/timer.c:1685 [inline] __run_timers kernel/time/timer.c:1653 [inline] run_timer_softirq+0x66f/0x1740 kernel/time/timer.c:1698 __do_softirq+0x25c/0x94c kernel/softirq.c:293 invoke_softirq kernel/softirq.c:374 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:414 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x13b/0x550 arch/x86/kernel/apic/apic.c:1068 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806 filemap_map_pages+0xf97/0x1330 mm/filemap.c:2643 do_fault_around mm/memory.c:3498 [inline] do_read_fault mm/memory.c:3532 [inline] do_fault mm/memory.c:3666 [inline] handle_pte_fault mm/memory.c:3897 [inline] __handle_mm_fault+0x31e2/0x3eb0 mm/memory.c:4021 handle_mm_fault+0x3b7/0xa90 mm/memory.c:4058 do_user_addr_fault arch/x86/mm/fault.c:1457 [inline] __do_page_fault+0x5ef/0xda0 arch/x86/mm/fault.c:1523 do_page_fault+0x71/0x57d arch/x86/mm/fault.c:1554 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1156 irq event stamp: 851 hardirqs last enabled at (851): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (851): [] _raw_spin_unlock_irqrestore+0x6b/0xe0 kernel/locking/spinlock.c:191 hardirqs last disabled at (850): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (850): [] _raw_spin_lock_irqsave+0x6f/0xcd kernel/locking/spinlock.c:159 softirqs last enabled at (840): [] __do_softirq+0x654/0x94c kernel/softirq.c:320 softirqs last disabled at (739): [] invoke_softirq kernel/softirq.c:374 [inline] softirqs last disabled at (739): [] irq_exit+0x180/0x1d0 kernel/softirq.c:414 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_AX25); lock(slock-AF_AX25); *** DEADLOCK *** 2 locks held by syz-executor.1/7957: #0: 0000000002b282dc (sk_lock-AF_AX25){+.+.}, at: lock_sock include/net/sock.h:1520 [inline] #0: 0000000002b282dc (sk_lock-AF_AX25){+.+.}, at: ax25_connect+0x188/0x13f0 net/ax25/af_ax25.c:1149 #1: 00000000f0f21b4c (ax25_route_lock){++.+}, at: ax25_route_lock_use include/net/ax25.h:208 [inline] #1: 00000000f0f21b4c (ax25_route_lock){++.+}, at: ax25_rt_autobind+0x28/0x720 net/ax25/ax25_route.c:395 stack backtrace: CPU: 0 PID: 7957 Comm: syz-executor.1 Not tainted 5.2.0-rc3+ #34 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_usage_bug.cold+0x393/0x4a2 kernel/locking/lockdep.c:2935 valid_state kernel/locking/lockdep.c:2948 [inline] mark_lock_irq kernel/locking/lockdep.c:3138 [inline] mark_lock+0xd46/0x1370 kernel/locking/lockdep.c:3513 mark_irqflags kernel/locking/lockdep.c:3409 [inline] __lock_acquire+0x12df/0x5490 kernel/locking/lockdep.c:3745 lock_acquire+0x16f/0x3f0 kernel/locking/lockdep.c:4303 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] ax25_rt_autobind+0x3ca/0x720 net/ax25/ax25_route.c:429 ax25_connect.cold+0x30/0xa4 net/ax25/af_ax25.c:1221 __sys_connect+0x264/0x330 net/socket.c:1834 __do_sys_connect net/socket.c:1845 [inline] __se_sys_connect net/socket.c:1842 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1842 do_syscall_64+0xfd/0x680 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4592c9 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f3f2e000c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004592c9 RDX: 0000000000000048 RSI: 00000000200001c0 RDI: 0000000000000006 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3f2e0016d4 R13: 00000000004bf741 R14: 00000000004d0e78 R15: 00000000ffffffff