general protection fault in rxrpc_get

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.14	general protection fault in rxrpc_get_skb	C		error	21	591d	1699d	0/1	upstream: reported C repro on 2019/09/01 19:05

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