WARNING in xfrm_policy

WARNING in xfrm_policy_insert
Status: upstream: reported syz repro on 2019/08/31 06:44
Reported-by: syzbot+019bd01a00a906c42580@syzkaller.appspotmail.com
First crash: 81d, last: 52d

similar bugs (5):
Kernel	Title	Repro	Count	Last	Reported	Patched	Status
upstream	WARNING in xfrm_policy_insert	C	6	84d	644d	0/14	upstream: reported C repro on 2018/02/14 08:09
linux-4.19	WARNING in xfrm_policy_insert	syz	3	38d	63d	0/1	upstream: reported syz repro on 2019/09/17 18:21
android-414	WARNING in xfrm_policy_insert	C	5	39d	75d	0/1	public: reported C repro on 2019/09/06 10:33
android-44	WARNING in xfrm_policy_insert	C	13	28d	220d	0/2	public: reported C repro on 2019/04/14 00:02
android-49	WARNING in xfrm_policy_insert	C	24	16d	220d	0/3	public: reported C repro on 2019/04/14 00:00

Sample crash report:

IPv6: ADDRCONF(NETDEV_CHANGE): hsr0: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
IPv6: ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
------------[ cut here ]------------
WARNING: CPU: 1 PID: 6899 at net/xfrm/xfrm_policy.c:752 xfrm_policy_insert+0x679/0x11e0 net/xfrm/xfrm_policy.c:752
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 6899 Comm: syz-executor.0 Not tainted 4.14.142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x138/0x197 lib/dump_stack.c:53
 panic+0x1f2/0x426 kernel/panic.c:182
 __warn.cold+0x2f/0x36 kernel/panic.c:546
 report_bug+0x216/0x254 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bb/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963
RIP: 0010:xfrm_policy_insert+0x679/0x11e0 net/xfrm/xfrm_policy.c:752
RSP: 0018:ffff8880a7c47560 EFLAGS: 00010297
RAX: ffff888094c50480 RBX: ffff8880a8536d80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a8536fb0
RBP: ffff8880a7c475f8 R08: 0000000000001f0f R09: ffffffff88c8ecf8
R10: ffff888094c50d28 R11: ffff888094c50480 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000350759
 xfrm_add_policy+0x230/0x4f0 net/xfrm/xfrm_user.c:1635
 xfrm_user_rcv_msg+0x3c9/0x690 net/xfrm/xfrm_user.c:2625
 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432
 xfrm_netlink_rcv+0x70/0x90 net/xfrm/xfrm_user.c:2633
 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline]
 netlink_unicast+0x45d/0x640 net/netlink/af_netlink.c:1312
 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xce/0x110 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xb9/0x140 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x2d/0x50 net/socket.c:2103
 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459879
RSP: 002b:00007fdc5426bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459879
RDX: 0000000000000000 RSI: 0000000020000080 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fdc5426c6d4
R13: 00000000004c77d9 R14: 00000000004dd030 R15: 00000000ffffffff
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (6):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	Maintainers
ci2-linux-4-14	2019/09/06 13:52	linux-4.14.y	414510bc	c16be727	.config	log	report	syz	davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com
ci2-linux-4-14	2019/09/29 15:04	linux-4.14.y	f6e27dbb	c1ad5441	.config	log	report	syz	davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com
ci2-linux-4-14	2019/09/26 16:06	linux-4.14.y	f6e27dbb	24d405a3	.config	log	report	syz	davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com
ci2-linux-4-14	2019/09/23 10:20	linux-4.14.y	f6e27dbb	d96e88f3	.config	log	report	syz	davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com
ci2-linux-4-14	2019/08/31 05:43	linux-4.14.y	01fd1694	bcd7bcc2	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com
ci2-linux-4-14	2019/09/26 15:14	linux-4.14.y	f6e27dbb	24d405a3	.config	log	report		davem@davemloft.net, herbert@gondor.apana.org.au, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, steffen.klassert@secunet.com