1FILE: net/ipv6/ip6_output.c 2 3DEBUG_LOCKS_WARN_ON(class_idx > MAX_LOCKDEP_KEYS) 4------------[ cut here ]------------ 5WARNING: CPU: 2 PID: 24023 at kernel/locking/lockdep.c:3344 __lock_acquire+0x10e5/0x3690 kernel/locking/lockdep.c:3344 6Kernel panic - not syncing: panic_on_warn set ... 7 8CPU: 2 PID: 24023 Comm: syz-executor1 Not tainted 4.12.0-rc3+ #370 9Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 10Call Trace: 11 __dump_stack lib/dump_stack.c:16 [inline] 12 dump_stack+0x292/0x395 lib/dump_stack.c:52 13 panic+0x1cb/0x3a9 kernel/panic.c:180 14 __warn+0x1c4/0x1e0 kernel/panic.c:541 15 report_bug+0x211/0x2d0 lib/bug.c:183 16 fixup_bug arch/x86/kernel/traps.c:190 [inline] 17 do_trap_no_signal arch/x86/kernel/traps.c:224 [inline] 18 do_trap+0x32c/0x410 arch/x86/kernel/traps.c:273 19 do_error_trap+0x15a/0x3e0 arch/x86/kernel/traps.c:310 20 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:323 21 invalid_op+0x1e/0x30 arch/x86/entry/entry_64.S:844 22RIP: 0010:__lock_acquire+0x10e5/0x3690 kernel/locking/lockdep.c:3344 23RSP: 0018:ffff88005aba6100 EFLAGS: 00010086 24RAX: 0000000000000031 RBX: ffff880058995b40 RCX: 0000000000000000 25RDX: 0000000000000031 RSI: ffffffff81458577 RDI: ffffed000b574c12 26RBP: ffff88005aba6640 R08: 0000000000000001 R09: 0000000000000001 27R10: ffff8800589963a0 R11: fffffbfff0e0fc7a R12: 0000000000000000 28R13: 0000000000000010 R14: 0000000000000001 R15: 0000000000000010 29 lock_acquire+0x22d/0x560 kernel/locking/lockdep.c:3855 30 seqcount_lockdep_reader_access include/linux/seqlock.h:80 [inline] 31 read_seqcount_begin include/linux/seqlock.h:163 [inline] 32 read_seqbegin include/linux/seqlock.h:433 [inline] 33 neigh_hh_output include/net/neighbour.h:456 [inline] 34 neigh_output include/net/neighbour.h:477 [inline] 35 ip6_finish_output2+0x109a/0x2540 net/ipv6/ip6_output.c:123 36 ip6_finish_output+0x302/0x930 net/ipv6/ip6_output.c:149 37 NF_HOOK_COND include/linux/netfilter.h:246 [inline] 38 ip6_output+0x1c2/0x8a0 net/ipv6/ip6_output.c:163 39 ip6_xmit+0xd38/0x21c0 include/net/dst.h:492 40 inet6_csk_xmit+0x331/0x600 net/ipv6/inet6_connection_sock.c:139 41 tcp_transmit_skb+0x1ad8/0x3460 net/ipv4/tcp_output.c:1055 42 tcp_connect+0x2195/0x2f30 net/ipv4/tcp_output.c:3381 43 tcp_v6_connect+0x1c0b/0x20f0 net/ipv6/tcp_ipv6.c:304 44 __inet_stream_connect+0x2ee/0xf90 net/ipv4/af_inet.c:618 45 inet_stream_connect+0x58/0xa0 net/ipv4/af_inet.c:682 46 SYSC_connect+0x251/0x590 net/socket.c:1588 47 SyS_connect+0x24/0x30 net/socket.c:1569 48 entry_SYSCALL_64_fastpath+0x1f/0xbe 49RIP: 0033:0x446179 50RSP: 002b:00007fb738f47c08 EFLAGS: 00000286 ORIG_RAX: 000000000000002a 51RAX: ffffffffffffffda RBX: 0000000000000400 RCX: 0000000000446179 52RDX: 000000000000001c RSI: 0000000020411000 RDI: 0000000000000005 53RBP: 00000000ffffffff R08: 0000000000000000 R09: 0000000000000000 54R10: 0000000000000000 R11: 0000000000000286 R12: 0000000000000005 55R13: 0000000000000000 R14: 00007fb738f489c0 R15: 00007fb738f48700 56Dumping ftrace buffer: 57 (ftrace buffer empty) 58Kernel Offset: disabled 59Rebooting in 86400 seconds.. 60