RAX: ffffffffffffffda RBX: 00007f71a11796d4 RCX: 0000000000456c99
RDX: 000000002015bffc RSI: 0000000020343ff8 RDI: 0000000020000040
RBP: 00000000009300a0 R08: 000000002000a000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013
R13: 00000000004d1e58 R14: 00000000004c75a6 R15: 0000000000000042
BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 8000000212ab3067 P4D 8000000212ab3067 PUD 212119067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 1 PID: 24339 Comm: kworker/u4:0 Not tainted 4.18.0-rc8+ #31
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rpciod rpc_async_schedule
RIP: 0010:strlen+0x10/0x20 lib/string.c:484
Code: 00 00 43 c6 04 3e 00 48 89 d8 5b 41 5e 41 5f 5d c3 66 0f 1f 84 00 00 00 00 00 48 8d 47 ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <80> 78 01 00 48 8d 40 01 75 f6 48 29 f8 c3 66 90 41 56 53 48 c7 c0 
RSP: 0018:ffff8802076dfcf8 EFLAGS: 00010293
RAX: ffffffffffffffff RBX: 0000000000000004 RCX: ffff8802015a8dc0
RDX: 0000000000000000 RSI: ffffffff832b341e RDI: 0000000000000000
RBP: ffff8802076dfd28 R08: ffff8801f27c1940 R09: ffff8802161be839
R10: fefefefefefefeff R11: ffffffff826e4ad0 R12: 0000000000000000
R13: 0000000000000004 R14: ffff8802076dfd38 R15: ffff8801f27c1940
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000212aaa000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 rpcauth_wrap_req_encode net/sunrpc/auth.c:777 [inline]
 rpcauth_wrap_req+0x8a/0xa0 net/sunrpc/auth.c:791
 rpc_xdr_encode net/sunrpc/clnt.c:1755 [inline]
 call_transmit+0x1a4/0x2a0 net/sunrpc/clnt.c:1950
 __rpc_execute+0x130/0x480 net/sunrpc/sched.c:784
 rpc_async_schedule+0x19/0x20 net/sunrpc/sched.c:857
 process_one_work+0x28e/0x580 kernel/workqueue.c:2153
 worker_thread+0x317/0x690 kernel/workqueue.c:2296
 kthread+0x127/0x140 kernel/kthread.c:247
 ret_from_fork+0x35/0x40 arch/x86/entry/entry_64.S:415
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 026b31889c88fb9a ]---
RIP: 0010:strlen+0x10/0x20 lib/string.c:484
Code: 00 00 43 c6 04 3e 00 48 89 d8 5b 41 5e 41 5f 5d c3 66 0f 1f 84 00 00 00 00 00 48 8d 47 ff 66 90 66 2e 0f 1f 84 00 00 00 00 00 <80> 78 01 00 48 8d 40 01 75 f6 48 29 f8 c3 66 90 41 56 53 48 c7 c0 
RSP: 0018:ffff8802076dfcf8 EFLAGS: 00010293
RAX: ffffffffffffffff RBX: 0000000000000004 RCX: ffff8802015a8dc0
RDX: 0000000000000000 RSI: ffffffff832b341e RDI: 0000000000000000
RBP: ffff8802076dfd28 R08: ffff8801f27c1940 R09: ffff8802161be839
R10: fefefefefefefeff R11: ffffffff826e4ad0 R12: 0000000000000000
R13: 0000000000000004 R14: ffff8802076dfd38 R15: ffff8801f27c1940
FS:  0000000000000000(0000) GS:ffff88021fd00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000212aaa000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600