panic: text:ADDR len:LINE put:LINE head:ADDR data:ADDR tail:LINEx6d0 end:LINEx6c0 dev:<NULL>

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: dcd34bd2 Add linux-next specific files for 20191106
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=16a3f158e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=742545dcdea21726
dashboard link: https://syzkaller.appspot.com/bug?extid=ef2d3de6eb0b423e2c6d
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
CC: [da...@davemloft.net her...@gondor.apana.org.au
linux-...@vger.kernel.org net...@vger.kernel.org
steffen....@secunet.com]

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+ef2d3d...@syzkaller.appspotmail.com

skbuff: skb_over_panic: text:00000000db6cba37 len:1744 put:72
head:0000000092f15526 data:0000000092f15526 tail:0x6d0 end:0x6c0 dev:<NULL>
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:108!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 27281 Comm: syz-executor.2 Not tainted 5.4.0-rc6-next-20191106
#0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:skb_panic+0x176/0x178 net/core/skbuff.c:108
Code: 40 03 fc 4c 8b 4d b8 8b 4b 70 41 57 45 89 f0 4c 89 ea ff 75 d0 4c 89
e6 48 c7 c7 20 9d 48 88 ff 75 c8 ff 75 c0 e8 c2 a5 b0 fb <0f> 0b e8 57 16
c7 fb 4c 8b 6d 08 e8 8e 37 03 fc 48 c7 c1 c0 a9 48
RSP: 0018:ffff888050cb6ab8 EFLAGS: 00010282
RAX: 0000000000000089 RBX: ffff8880996952c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815d0b86 RDI: ffffed100a196d49
RBP: ffff888050cb6b20 R08: 0000000000000089 R09: ffffed1015d26161
R10: ffffed1015d26160 R11: ffff8880ae930b07 R12: ffffffff8848aa00
R13: ffffffff867161e9 R14: 0000000000000048 R15: ffffffff88489ce0
FS: 00007faa05750700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2f121000 CR3: 00000000a15c7000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
skb_over_panic net/core/skbuff.c:113 [inline]
skb_put.cold+0x23/0x23 net/core/skbuff.c:1866
dump_esp_combs net/key/af_key.c:2999 [inline]
pfkey_send_acquire+0x1bd9/0x2620 net/key/af_key.c:3220
km_query+0xcb/0x210 net/xfrm/xfrm_state.c:2164
xfrm_state_find+0x2d06/0x5030 net/xfrm/xfrm_state.c:1131
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2391 [inline]
xfrm_tmpl_resolve+0x32a/0xc90 net/xfrm/xfrm_policy.c:2436
xfrm_resolve_and_create_bundle+0x137/0x2660 net/xfrm/xfrm_policy.c:2727
xfrm_lookup_with_ifid+0x278/0x1fb0 net/xfrm/xfrm_policy.c:3050
xfrm_lookup net/xfrm/xfrm_policy.c:3174 [inline]
xfrm_lookup_route+0x3b/0x1e0 net/xfrm/xfrm_policy.c:3185
ip_route_output_flow+0xad/0xc0 net/ipv4/route.c:2726
udp_sendmsg+0x1bcd/0x2810 net/ipv4/udp.c:1144
udpv6_sendmsg+0x13a6/0x2990 net/ipv6/udp.c:1284
inet6_sendmsg+0x9e/0xe0 net/ipv6/af_inet6.c:576
sock_sendmsg_nosec net/socket.c:638 [inline]
sock_sendmsg+0xd7/0x130 net/socket.c:658
___sys_sendmsg+0x3e2/0x920 net/socket.c:2329
__sys_sendmmsg+0x1bf/0x4d0 net/socket.c:2431
__do_sys_sendmmsg net/socket.c:2460 [inline]
__se_sys_sendmmsg net/socket.c:2457 [inline]
__x64_sys_sendmmsg+0x9d/0x100 net/socket.c:2457
do_syscall_64+0xfa/0x760 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a219
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007faa0574fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a219
RDX: 00000000000005c3 RSI: 0000000020000240 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000003e8 R11: 0000000000000246 R12: 00007faa057506d4
R13: 00000000004c7f9d R14: 00000000004de3c8 R15: 00000000ffffffff
Modules linked in:
---[ end trace 20c16582a7cd5c2d ]---
RIP: 0010:skb_panic+0x176/0x178 net/core/skbuff.c:108
Code: 40 03 fc 4c 8b 4d b8 8b 4b 70 41 57 45 89 f0 4c 89 ea ff 75 d0 4c 89
e6 48 c7 c7 20 9d 48 88 ff 75 c8 ff 75 c0 e8 c2 a5 b0 fb <0f> 0b e8 57 16
c7 fb 4c 8b 6d 08 e8 8e 37 03 fc 48 c7 c1 c0 a9 48
RSP: 0018:ffff888050cb6ab8 EFLAGS: 00010282
RAX: 0000000000000089 RBX: ffff8880996952c0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff815d0b86 RDI: ffffed100a196d49
RBP: ffff888050cb6b20 R08: 0000000000000089 R09: ffffed1015d26161
R10: ffffed1015d26160 R11: ffff8880ae930b07 R12: ffffffff8848aa00
R13: ffffffff867161e9 R14: 0000000000000048 R15: ffffffff88489ce0
FS: 00007faa05750700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe277e1dcc CR3: 00000000a15c7000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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[Dmitry Vyukov]

#syz dup: kernel BUG at net/core/skbuff.c:LINE! (3)

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