general protection fault in bpf_skb_change_head

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: d649ef04 UPSTREAM: mm/kasan: fix false positive invalid-fr..
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=15e43805600000
kernel config: https://syzkaller.appspot.com/x/.config?x=18f58950bb3393bd
dashboard link: https://syzkaller.appspot.com/bug?extid=7462fefe251dcc28b8bc
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+7462fe...@syzkaller.appspotmail.com

kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI
Modules linked in:
CPU: 1 PID: 32218 Comm: syz-executor.3 Not tainted 4.14.146+ #0
task: 00000000f8ba70ec task.stack: 00000000898b1c81
RIP: 0010:skb_is_gso include/linux/skbuff.h:4002 [inline]
RIP: 0010:____bpf_skb_change_head net/core/filter.c:2426 [inline]
RIP: 0010:bpf_skb_change_head+0xe9/0x600 net/core/filter.c:2419
RSP: 0018:ffff8881d3aef7f0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881c0655e00 RCX: 00000000000001fa
RDX: 000000001021651a RSI: ffffc90000541000 RDI: 00000000810b28d3
RBP: 0000000000000703 R08: 0000000000000001 R09: ffffed103b7644fa
R10: ffffed103b7644f9 R11: ffff8881dbb227cf R12: 00000000810b28cf
R13: 00000000810b2fd3 R14: 00000000810b2fd3 R15: 0000000000000000
FS: 00007f62bbb12700(0000) GS:ffff8881dbb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6f60d634a0 CR3: 00000001d1cc6004 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
___bpf_prog_run+0x2478/0x5510 kernel/bpf/core.c:1095
Code: 7c 08 84 d2 0f 85 4f 04 00 00 44 8b a3 c4 00 00 00 48 b8 00 00 00 00
00 fc ff df 4c 03 24 24 49 8d 7c 24 04 48 89 fa 48 c1 ea 03 <0f> b6 14 02
48 89 f8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85
RIP: skb_is_gso include/linux/skbuff.h:4002 [inline] RSP: ffff8881d3aef7f0
RIP: ____bpf_skb_change_head net/core/filter.c:2426 [inline] RSP:
ffff8881d3aef7f0
RIP: bpf_skb_change_head+0xe9/0x600 net/core/filter.c:2419 RSP:
ffff8881d3aef7f0
---[ end trace 3849040531ceeddf ]---
Kernel panic - not syncing: Fatal exception
Kernel Offset: 0x39800000 from 0xffffffff81000000 (relocation range:
0xffffffff80000000-0xffffffffbfffffff)
Rebooting in 86400 seconds..


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[syzbot]

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