构造服务端异常掉电后，客户端读取共享目录，概率性出现 oops 复位

【环境信息】
硬件信息：
系统：kvm
内存：4g
cpu：4核
软件信息：
OS版本：openeuler-2020-03-18-15-29-06
内核信息：4.19.90-2003.1.1.0033.oe1.x86_64
【问题复现步骤】
构造服务端异常掉电后，客户端读取共享目录
【预期结果】
无法读取，系统无异常
【实际结果】
客户端oops复位
```
[  397.787693] CIFS VFS: cifs_mount failed w/return code = -2
[  403.671998] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
[  403.672065] PGD 0 P4D 0 
[  403.672087] Oops: 0000 [#1] SMP PTI
[  403.672114] CPU: 3 PID: 47 Comm: kworker/3:1 Kdump: loaded Not tainted 4.19.90-2003.1.1.0033.oe1.x86_64 #1
[  403.672173] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-20181220_000000-szxrtosci10000 04/01/2014
[  403.673038] Workqueue: cifsiod smb2_reconnect_server [cifs]
[  403.673746] RIP: 0010:__list_del_entry_valid+0x25/0x90
[  403.674448] Code: c3 0f 1f 40 00 48 8b 07 48 b9 00 01 00 00 00 00 ad de 48 8b 57 08 48 39 c8 74 26 48 b9 00 02 00 00 00 00 ad de 48 39 ca 74 2e <48> 8b 32 48 39 fe 75 3a 48 8b 50 08 48 39 f2 75 48 b8 01 00 00 00
[  403.675955] RSP: 0018:ffffbd48007c3e18 EFLAGS: 00010207
[  403.676696] RAX: 0000000000000000 RBX: ffffbd48007c3e50 RCX: dead000000000200
[  403.677447] RDX: 0000000000000000 RSI: 0000000000000206 RDI: ffff9bee27f65818
[  403.678214] RBP: ffffbd48007c3e38 R08: ffff9bee3bba3038 R09: 00000000000002c2
[  403.679001] R10: ffffbd48006a3d90 R11: 0000000000000000 R12: ffff9bee27f66818
[  403.679811] R13: 0000000000000001 R14: ffff9bee27f65800 R15: ffff9bee27f65818
[  403.680639] FS:  0000000000000000(0000) GS:ffff9bee3bb80000(0000) knlGS:0000000000000000
[  403.681505] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  403.682391] CR2: 0000000000000000 CR3: 000000003040a005 CR4: 00000000003606e0
[  403.683315] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  403.684247] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  403.685181] Call Trace:
[  403.686141]  smb2_reconnect_server+0x17a/0x340 [cifs]
[  403.687118]  process_one_work+0x195/0x3d0
[  403.688102]  worker_thread+0x30/0x390
[  403.689096]  ? process_one_work+0x3d0/0x3d0
[  403.690111]  kthread+0x113/0x130
[  403.691132]  ? kthread_create_worker_on_cpu+0x70/0x70
[  403.692181]  ret_from_fork+0x35/0x40
```

src-openEuler/cifs-utils

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