BUG: unable to handle kernel paging request in xfrmi_decode_session

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 19bb613a Linux 4.19.37
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=16ebd790a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=2f4f1677ff80cdff
dashboard link: https://syzkaller.appspot.com/bug?extid=a7f6aa5dcbe9ccbb0059
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

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+a7f6aa...@syzkaller.appspotmail.com

BUG: unable to handle kernel paging request at ffffffff00000000
kobject: 'batman_adv' (00000000ada8a926): kobject_uevent_env
PGD 8670067 P4D 8670067 PUD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 20689 Comm: syz-executor.5 Not tainted 4.19.37 #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:xs_net include/net/xfrm.h:253 [inline]
RIP: 0010:xfrmi_decode_session+0xf5/0x630 net/xfrm/xfrm_interface.c:82
Code: 80 3c 02 00 0f 85 fd 04 00 00 48 b8 00 00 00 00 00 fc ff df 4f 8b 64
e7 10 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 2c 05 00 00 <4d> 8b 3c 24 e8
92 c2 66 fb e8 9d 19 79 fb 45 31 c9 45 31 c0 31 d2
RSP: 0018:ffff888049447048 EFLAGS: 00010246
protocol 88fb is buggy, dev hsr_slave_0
RAX: dffffc0000000000 RBX: ffff888096096040 RCX: ffffc900108c4000
RDX: 1fffffffe0000000 RSI: ffffffff85f22d55 RDI: ffff8880914f5788
RBP: ffff888049447070 R08: ffff8880494883c0 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffffffff00000000
protocol 88fb is buggy, dev hsr_slave_1
R13: 0000000000000037 R14: ffff888096096050 R15: ffff8880914f5780
FS: 00007fddaf437700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000000 CR3: 000000009f091000 CR4: 00000000001406e0
Call Trace:
__xfrm_policy_check+0x1fa/0x2560 net/xfrm/xfrm_policy.c:2342
__xfrm_policy_check2 include/net/xfrm.h:1202 [inline]
xfrm_policy_check include/net/xfrm.h:1207 [inline]
xfrm6_policy_check include/net/xfrm.h:1217 [inline]
vti6_rcv+0x4b9/0x960 net/ipv6/ip6_vti.c:316
xfrm6_esp_rcv+0xd8/0x230 net/ipv6/xfrm6_protocol.c:74
ip6_input_finish+0x374/0x1810 net/ipv6/ip6_input.c:383
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ip6_input+0xe4/0x3f0 net/ipv6/ip6_input.c:426
ip6_mc_input+0x427/0xb00 net/ipv6/ip6_input.c:503
dst_input include/net/dst.h:450 [inline]
ip6_rcv_finish+0x1e7/0x320 net/ipv6/ip6_input.c:76
NF_HOOK include/linux/netfilter.h:289 [inline]
NF_HOOK include/linux/netfilter.h:283 [inline]
ipv6_rcv+0x119/0x430 net/ipv6/ip6_input.c:271
__netif_receive_skb_one_core+0x115/0x1a0 net/core/dev.c:4932
__netif_receive_skb+0x2c/0x1d0 net/core/dev.c:5044
netif_receive_skb_internal+0x117/0x520 net/core/dev.c:5147
napi_frags_finish net/core/dev.c:5690 [inline]
napi_gro_frags+0x623/0xa30 net/core/dev.c:5763
tun_get_user+0x2edb/0x4bb0 drivers/net/tun.c:1936
tun_chr_write_iter+0xbd/0x156 drivers/net/tun.c:1982
call_write_iter include/linux/fs.h:1811 [inline]
do_iter_readv_writev+0x55d/0x830 fs/read_write.c:680
do_iter_write fs/read_write.c:959 [inline]
do_iter_write+0x184/0x600 fs/read_write.c:940
vfs_writev+0x1b3/0x2f0 fs/read_write.c:1004
do_writev+0xf6/0x290 fs/read_write.c:1039
__do_sys_writev fs/read_write.c:1112 [inline]
__se_sys_writev fs/read_write.c:1109 [inline]
__x64_sys_writev+0x75/0xb0 fs/read_write.c:1109
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458c61
Code: 75 14 b8 14 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 e4 b9 fb ff c3 48
83 ec 08 e8 1a 2d 00 00 48 89 04 24 b8 14 00 00 00 0f 05 <48> 8b 3c 24 48
89 c2 e8 63 2d 00 00 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fddaf436ba0 EFLAGS: 00000293 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000000006e RCX: 0000000000458c61
RDX: 0000000000000001 RSI: 00007fddaf436c00 RDI: 00000000000000f0
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00007fddaf4376d4
R13: 00000000004c76b6 R14: 00000000004dd610 R15: 00000000ffffffff
Modules linked in:
CR2: ffffffff00000000
---[ end trace b1ab855605633f0d ]---
RIP: 0010:xs_net include/net/xfrm.h:253 [inline]
RIP: 0010:xfrmi_decode_session+0xf5/0x630 net/xfrm/xfrm_interface.c:82
Code: 80 3c 02 00 0f 85 fd 04 00 00 48 b8 00 00 00 00 00 fc ff df 4f 8b 64
e7 10 4c 89 e2 48 c1 ea 03 80 3c 02 00 0f 85 2c 05 00 00 <4d> 8b 3c 24 e8
92 c2 66 fb e8 9d 19 79 fb 45 31 c9 45 31 c0 31 d2
RSP: 0018:ffff888049447048 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff888096096040 RCX: ffffc900108c4000
RDX: 1fffffffe0000000 RSI: ffffffff85f22d55 RDI: ffff8880914f5788
RBP: ffff888049447070 R08: ffff8880494883c0 R09: ffffed1015d24733
R10: ffffed1015d24732 R11: ffff8880ae923993 R12: ffffffff00000000
R13: 0000000000000037 R14: ffff888096096050 R15: ffff8880914f5780
FS: 00007fddaf437700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffff00000000 CR3: 000000009f091000 CR4: 00000000001406e0


---
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 syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[syzbot]

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