general protection fault in rxrpc_get_skb

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: bc183dec tcp: tcp_init_buffer_space can be static
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12834686100000
kernel config: https://syzkaller.appspot.com/x/.config?x=55b0bb710b7fdf44
dashboard link: https://syzkaller.appspot.com/bug?extid=64ce4cc2b94c102c3255
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
CC: [da...@davemloft.net dhow...@redhat.com ku...@kernel.org linu...@lists.infradead.org linux-...@vger.kernel.org net...@vger.kernel.org net...@vger.kernel.org]

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+64ce4c...@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 1 PID: 9187 Comm: kworker/1:17 Not tainted 5.7.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: krxrpcd rxrpc_process_call
RIP: 0010:rxrpc_get_skb+0x38/0x500 net/rxrpc/skbuff.c:50
Code: 8d 6b 2d 48 83 ec 18 89 74 24 0c e8 c2 b7 3f fa 48 8b 44 24 48 4c 89 ea 48 c1 ea 03 48 89 04 24 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 48 04 00 00
RSP: 0018:ffffc9000780fbd0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff872e24bc
RDX: 0000000000000005 RSI: ffffffff8733864e RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88805f8f6540 R09: fffff52000f01f77
R10: 0000000000000003 R11: fffff52000f01f76 R12: ffff88805b0ccb68
R13: 000000000000002d R14: 0000000000000002 R15: ffffed100b6199b5
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000078c000 CR3: 000000008896f000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rxrpc_resend net/rxrpc/call_event.c:252 [inline]
rxrpc_process_call+0x3016/0x4b55 net/rxrpc/call_event.c:420
process_one_work+0x965/0x16a0 kernel/workqueue.c:2268
worker_thread+0x96/0xe20 kernel/workqueue.c:2414
kthread+0x388/0x470 kernel/kthread.c:268
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351
Modules linked in:
---[ end trace d1e21189997f1bbb ]---
RIP: 0010:rxrpc_get_skb+0x38/0x500 net/rxrpc/skbuff.c:50
Code: 8d 6b 2d 48 83 ec 18 89 74 24 0c e8 c2 b7 3f fa 48 8b 44 24 48 4c 89 ea 48 c1 ea 03 48 89 04 24 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 02 4c 89 ea 83 e2 07 38 d0 7f 08 84 c0 0f 85 48 04 00 00
RSP: 0018:ffffc9000780fbd0 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff872e24bc
RDX: 0000000000000005 RSI: ffffffff8733864e RDI: 0000000000000000
RBP: 0000000000000000 R08: ffff88805f8f6540 R09: fffff52000f01f77
R10: 0000000000000003 R11: fffff52000f01f76 R12: ffff88805b0ccb68
R13: 000000000000002d R14: 0000000000000002 R15: ffffed100b6199b5
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000078c000 CR3: 000000008896f000 CR4: 00000000001406e0
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.
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.