Hello,
syzbot found the following crash on:
HEAD commit: 5037be168f0e Merge branch 'for-linus' of
git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1393dd4f800000
kernel config: https://syzkaller.appspot.com/x/.config?x=4f65cd4286737868
dashboard link: https://syzkaller.appspot.com/bug?extid=2b43f681169a2a0d306a
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=147ef0af800000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15effdef800000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2b43f681169a2a0d306a at syzkaller.appspotmail.com
IPv6: ADDRCONF(NETDEV_UP): team0: link is not ready
8021q: adding VLAN 0 to HW filter on device team0
IPv6: ADDRCONF(NETDEV_CHANGE): team0: link becomes ready
------------[ cut here ]------------
jump to non-chain
WARNING: CPU: 1 PID: 4490 at net/bridge/netfilter/ebtables.c:283
ebt_do_table+0x1c45/0x2140 net/bridge/netfilter/ebtables.c:283
Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 4490 Comm: syz-executor851 Not tainted 4.17.0+ #85
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+0x1b9/0x294 lib/dump_stack.c:113
panic+0x22f/0x4de kernel/panic.c:184
__warn.cold.8+0x163/0x1b3 kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:ebt_do_table+0x1c45/0x2140 net/bridge/netfilter/ebtables.c:283
Code: 61 6c 9c fa 0f 0b 48 8b bd 48 fe ff ff 31 db e8 71 16 c7 00 e9 29 fe
ff ff e8 87 39 d0 fa 48 c7 c7 c0 d5 57 88 e8 3b 6c 9c fa <0f> 0b 48 8b bd
48 fe ff ff 31 db e8 4b 16 c7 00 e9 03 fe ff ff bb
RSP: 0018:ffff8801d9bbdde8 EFLAGS: 00010282
RAX: 0000000000000011 RBX: 0000000000000200 RCX: ffffffff8160d09d
RDX: 0000000000000000 RSI: ffffffff81611d51 RDI: ffff8801d9bbd948
RBP: ffff8801d9bbdfb8 R08: ffff8801ad170080 R09: 0000000000000002
R10: ffff8801ad170080 R11: 0000000000000000 R12: ffffc90001e3c000
R13: ffffc90001e36130 R14: ffffc90001e36090 R15: dffffc0000000000
ebt_in_hook+0x65/0x80 net/bridge/netfilter/ebtable_filter.c:63
ebt_out_hook+0x25/0x30 net/bridge/netfilter/ebtable_filter.c:63
nf_hook_entry_hookfn include/linux/netfilter.h:120 [inline]
nf_hook_slow+0xc2/0x1c0 net/netfilter/core.c:483
nf_hook include/linux/netfilter.h:243 [inline]
NF_HOOK include/linux/netfilter.h:286 [inline]
__br_forward+0x520/0xd90 net/bridge/br_forward.c:112
deliver_clone+0x61/0xc0 net/bridge/br_forward.c:128
maybe_deliver net/bridge/br_forward.c:169 [inline]
br_flood+0x781/0x8d0 net/bridge/br_forward.c:211
br_dev_xmit+0x1121/0x1810 net/bridge/br_device.c:103
__netdev_start_xmit include/linux/netdevice.h:4087 [inline]
netdev_start_xmit include/linux/netdevice.h:4096 [inline]
xmit_one net/core/dev.c:3035 [inline]
dev_hard_start_xmit+0x264/0xc10 net/core/dev.c:3051
__dev_queue_xmit+0x2724/0x34c0 net/core/dev.c:3566
dev_queue_xmit+0x17/0x20 net/core/dev.c:3599
neigh_resolve_output+0x679/0xad0 net/core/neighbour.c:1358
neigh_output include/net/neighbour.h:482 [inline]
ip_finish_output2+0xa5f/0x1840 net/ipv4/ip_output.c:229
ip_do_fragment+0x218e/0x2ac0 net/ipv4/ip_output.c:675
ip_fragment.constprop.49+0x179/0x240 net/ipv4/ip_output.c:546
ip_finish_output+0x6cb/0xf80 net/ipv4/ip_output.c:315
NF_HOOK_COND include/linux/netfilter.h:277 [inline]
ip_output+0x21b/0x850 net/ipv4/ip_output.c:405
dst_output include/net/dst.h:444 [inline]
ip_local_out+0xc5/0x1b0 net/ipv4/ip_output.c:124
ip_send_skb+0x40/0xe0 net/ipv4/ip_output.c:1425
udp_send_skb+0x581/0xcc0 net/ipv4/udp.c:803
udp_push_pending_frames+0x4e/0xe0 net/ipv4/udp.c:831
udp_sendmsg+0x161e/0x35e0 net/ipv4/udp.c:1072
udpv6_sendmsg+0x2627/0x30f0 net/ipv6/udp.c:1180
inet_sendmsg+0x19f/0x690 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:633 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:643
__sys_sendto+0x3d7/0x670 net/socket.c:1814
__do_sys_sendto net/socket.c:1826 [inline]
__se_sys_sendto net/socket.c:1822 [inline]
__x64_sys_sendto+0xe1/0x1a0 net/socket.c:1822
do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x441ba9
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 6b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffddca95978 EFLAGS: 00000213 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000441ba9
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00000000006cd018 R08: 0000000020000180 R09: 000000000000001c
R10: 0000000000000000 R11: 0000000000000213 R12: 00000000004028a0
R13: 0000000000402930 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller at googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches