WARNING in ip6_pol_route

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: eb575cd5 Linux 4.19.195
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=150fa060300000
kernel config: https://syzkaller.appspot.com/x/.config?x=5506475cccaff975
dashboard link: https://syzkaller.appspot.com/bug?extid=b1d35964b87f9cefd8cd

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

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b1d359...@syzkaller.appspotmail.com

netlink: 4 bytes leftover after parsing attributes in process `syz-executor.1'.
overlayfs: failed to resolve './file0': -2
------------[ cut here ]------------
------------[ cut here ]------------
IRQs not enabled as expected
WARNING: CPU: 0 PID: 19825 at kernel/softirq.c:169 __local_bh_enable_ip+0x1bd/0x270 kernel/softirq.c:169
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 19825 Comm: syz-executor.3 Not tainted 4.19.195-syzkaller #0
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+0x1fc/0x2ef lib/dump_stack.c:118
panic+0x26a/0x50e kernel/panic.c:186
__warn.cold+0x20/0x5a kernel/panic.c:541
report_bug+0x262/0x2b0 lib/bug.c:183
fixup_bug arch/x86/kernel/traps.c:178 [inline]
fixup_bug arch/x86/kernel/traps.c:173 [inline]
do_error_trap+0x1d7/0x310 arch/x86/kernel/traps.c:296
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:__local_bh_enable_ip+0x1bd/0x270 kernel/softirq.c:169
Code: 7e 85 c0 74 7d 5b 5d 41 5c c3 80 3d 12 70 d5 09 00 0f 85 36 ff ff ff 48 c7 c7 a0 da 68 88 c6 05 fe 6f d5 09 01 e8 63 bb b8 06 <0f> 0b e9 1c ff ff ff 48 89 ef e8 54 3a 12 00 e9 5f ff ff ff 0f 0b
RSP: 0018:ffff888040436680 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff814dfc91 RDI: ffffed1008086cc2
RBP: ffffffff8707e9ad R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000005 R11: ffffffff8c66201b R12: ffff88804a57e180
R13: 1ffff11008086cd8 R14: ffff888045145b40 R15: 0000000000000003
local_bh_enable include/linux/bottom_half.h:32 [inline]
ip6_pol_route+0x343/0x1270 net/ipv6/route.c:1964
fib6_rule_lookup+0x10b/0x4e0 net/ipv6/fib6_rules.c:118
ip6_route_output_flags+0x2b0/0x350 net/ipv6/route.c:2163
ip6_route_output include/net/ip6_route.h:88 [inline]
ip6_dst_lookup_tail+0x104d/0x19b0 net/ipv6/ip6_output.c:990
icmpv6_route_lookup+0x9e/0x4e0 net/ipv6/icmp.c:343
icmp6_send+0x1592/0x22c0 net/ipv6/icmp.c:555
__icmpv6_send include/linux/icmpv6.h:28 [inline]
icmpv6_send include/linux/icmpv6.h:49 [inline]
ip6_link_failure+0x2d/0x4f0 net/ipv6/route.c:2297
dst_link_failure include/net/dst.h:438 [inline]
ip6_tnl_xmit+0x474/0x3500 net/ipv6/ip6_tunnel.c:1234
ip6ip6_tnl_xmit net/ipv6/ip6_tunnel.c:1388 [inline]
ip6_tnl_start_xmit+0x924/0x1de0 net/ipv6/ip6_tunnel.c:1414
__netdev_start_xmit include/linux/netdevice.h:4345 [inline]
netdev_start_xmit include/linux/netdevice.h:4359 [inline]
xmit_one net/core/dev.c:3256 [inline]
dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272
__dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838
neigh_output include/net/neighbour.h:501 [inline]
ip6_finish_output2+0x113d/0x2290 net/ipv6/ip6_output.c:120
ip6_finish_output+0x795/0xe50 net/ipv6/ip6_output.c:192
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x205/0x770 net/ipv6/ip6_output.c:209
dst_output include/net/dst.h:455 [inline]
ip6_local_out+0xaf/0x170 net/ipv6/output_core.c:178
ip6_send_skb+0xb3/0x300 net/ipv6/ip6_output.c:1737
udp_v6_send_skb+0x7d7/0x1610 net/ipv6/udp.c:1114
udpv6_sendmsg+0x236b/0x2ae0 net/ipv6/udp.c:1411
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2b23b08188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 00000000000000c6 RSI: 0000000020006d00 RDI: 0000000000000004
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe56b2aaaf R14: 00007f2b23b08300 R15: 0000000000022000

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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.