【openEuler-22.03-LTS-SP1】访问nfs挂载目录导致server重启

**【缺陷描述】：访问nfs挂载目录，导致server重启 **

**一、缺陷信息**

**【缺陷所属的os版本】（如openEuler-22.03-LTS，参考命令"cat /etc/os-release"结果）**
openEuler 22.03 (LTS-SP1)

**【内核版本】（如kernel-5.10.0-60.138.0.165，参考命令"uname -r"结果）**
5.10.0-136.108.0.188.oe2203sp1.aarch64

**【缺陷所属软件及版本号】（如kernel-5.10.0-60.138.0.165，参考命令"rpm -q 包名"结果）**
kernel-5.10.0-136.108.0.188.oe2203sp1.aarch64

**【环境信息】**
硬件信息
`TaiShan 200 (Model 5280)`

软件信息
`nfs-utils-2.5.4-9.oe2203sp1.aarch64`
`rpcbind-1.2.6-4.oe2203sp1.aarch64`

网络信息
不涉及

**【问题复现步骤】：请描述具体的操作步骤**
1. server创建nfs共享目录
2. client挂载目录
3. client在挂载目录中进行编译
4. server重启

**【实际结果】**，请描述出问题的结果和影响
内核空指针crash

**【期望结果】**，请描述出期望的结果和影响
正常访问

**【其他相关附件信息】**
```
46018.908382] Installing knfsd (copyright (C) 1996 okir@monad.swb.de).
[46019.182765] NFSD: Using nfsdcld client tracking operations.
[46019.189023] NFSD: starting 90-second grace period (net f0000078)
[46048.026707] systemd-fstab-generator[8330]: Failed to create unit file /run/systemd/generator/home.mount, as it already exists. Duplicate entry in /etc/fstab?
[46048.026739] systemd-rc-local-generator[8336]: /etc/rc.d/rc.local is not marked executable, skipping.
[46048.028428] systemd-sysv-generator[8341]: SysV service '/etc/rc.d/init.d/network' lacks a native systemd unit file. Automatically generating a unit file for compatibility. Please update package to include a native systemd unit file, in order to make it more safe and robust.
[46181.638243] nfsd: last server has exited, flushing export cache
[46181.966275] NFSD: Using nfsdcld client tracking operations.
[46181.972571] NFSD: starting 90-second grace period (net f0000078)
[46238.775803] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[46445.474237] nfsd: last server has exited, flushing export cache
[46445.757166] NFSD: Using nfsdcld client tracking operations.
[46445.763516] NFSD: starting 90-second grace period (net f0000078)
[46503.686630] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[46673.334230] nfsd: last server has exited, flushing export cache
[46673.624297] NFSD: Using nfsdcld client tracking operations.
[46673.630566] NFSD: starting 90-second grace period (net f0000078)
[46683.646783] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[46780.502232] nfsd: last server has exited, flushing export cache
[46780.786090] NFSD: Using nfsdcld client tracking operations.
[46780.792367] NFSD: starting 90-second grace period (net f0000078)
[46796.259831] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[46914.318248] nfsd: last server has exited, flushing export cache
[46914.604921] NFSD: Using nfsdcld client tracking operations.
[46914.611187] NFSD: starting 90-second grace period (net f0000078)
[46918.479087] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[47018.238260] nfsd: last server has exited, flushing export cache
[47018.561417] NFSD: Using nfsdcld client tracking operations.
[47018.567706] NFSD: starting 90-second grace period (net f0000078)
[47035.931915] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[49003.146226] nfsd: last server has exited, flushing export cache
[49003.439198] NFSD: Using nfsdcld client tracking operations.
[49003.445537] NFSD: starting 90-second grace period (net f0000078)
[49048.620076] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[49289.126242] nfsd: last server has exited, flushing export cache
[49289.406253] NFSD: Using nfsdcld client tracking operations.
[49289.412621] NFSD: starting 90-second grace period (net f0000078)
[49326.878238] nfsd: last server has exited, flushing export cache
[49327.136377] NFSD: Using nfsdcld client tracking operations.
[49327.142715] NFSD: starting 90-second grace period (net f0000078)
[49349.449675] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[49454.550239] nfsd: last server has exited, flushing export cache
[49455.075441] NFSD: Using nfsdcld client tracking operations.
[49455.081788] NFSD: starting 90-second grace period (net f0000078)
[49495.858238] nfsd: last server has exited, flushing export cache
[49496.348246] NFSD: Using nfsdcld client tracking operations.
[49496.354622] NFSD: starting 90-second grace period (net f0000078)
[49545.306232] nfsd: last server has exited, flushing export cache
[49545.563774] NFSD: Using nfsdcld client tracking operations.
[49545.570124] NFSD: starting 90-second grace period (net f0000078)
[49548.351561] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[49578.322235] nfsd: last server has exited, flushing export cache
[49578.590731] NFSD: Using nfsdcld client tracking operations.
[49578.597076] NFSD: starting 90-second grace period (net f0000078)
[49607.492558] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[49643.870242] nfsd: last server has exited, flushing export cache
[49647.263462] NFSD: Using nfsdcld client tracking operations.
[49647.269802] NFSD: starting 90-second grace period (net f0000078)
[49663.536895] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[50217.630239] nfsd: last server has exited, flushing export cache
[50218.089551] NFSD: Using nfsdcld client tracking operations.
[50218.095919] NFSD: starting 90-second grace period (net f0000078)
[50229.483405] NFSD: all clients done reclaiming, ending NFSv4 grace period (net f0000078)
[50658.248231] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000244
[50658.257723] Mem abort info:
[50658.261271]   ESR = 0x96000004
[50658.265102]   EC = 0x25: DABT (current EL), IL = 32 bits
[50658.271203]   SET = 0, FnV = 0
[50658.274963]   EA = 0, S1PTW = 0
[50658.278825] Data abort info:
[50658.282437]   ISV = 0, ISS = 0x00000004
[50658.287008]   CM = 0, WnR = 0
[50658.290766] user pgtable: 4k pages, 48-bit VAs, pgdp=00000021b369b000
[50658.297896] [0000000000000244] pgd=0000000000000000, p4d=0000000000000000
[50658.305441] Internal error: Oops: 0000000096000004 [#1] SMP
[50658.311680] Modules linked in: rpcsec_gss_krb5 nfsd auth_rpcgss nfs_acl lockd grace nfs_ssc vhost_net vhost vhost_iotlb tap nf_conntrack_netlink xt_CHECKSUM xt_addrtype xt_MASQUERADE br_netfilter xt_conntrack ipt_REJECT tun bridge stp llc overlay nft_masq nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_tables ebtable_nat ebtable_broute ip6table_nat ip6table_mangle ip6table_raw ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_raw iptable_security rfkill ip_set nfnetlink ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables vfat fat rpcrdma sunrpc rdma_ucm ib_srpt ib_isert iscsi_target_mod target_core_mod ib_iser rdma_cm iw_cm ib_cm libiscsi scsi_transport_iscsi raid1 ipmi_ssif hns_roce_hw_v2 ib_uverbs ib_core hibmc_drm acpi_ipmi drm_vram_helper drm_ttm_helper sg ipmi_si ttm hisi_uncore_l3c_pmu
[50658.311746]  hisi_uncore_hha_pmu hisi_uncore_ddrc_pmu hisi_uncore_pmu ipmi_devintf ipmi_msghandler sch_fq_codel fuse ext4 mbcache jbd2 sd_mod t10_pi hisi_sas_v3_hw realtek hisi_sas_main libsas ahci ghash_ce sha2_ce libahci scsi_transport_sas hclge hinic sha256_arm64 sha1_ce sbsa_gwdt nfit libata hns3 libnvdimm hnae3 host_edma_drv i2c_designware_platform i2c_designware_core dm_mirror dm_region_hash dm_log dm_mod aes_neon_bs aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher
[50658.439517] CPU: 2 PID: 10293 Comm: kworker/u257:0 Kdump: loaded Not tainted 5.10.0-136.108.0.188.oe2203sp1.aarch64 #1
[50658.450853] Hardware name: Huawei TaiShan 200 (Model 5280)/BC82AMDD, BIOS 1.93 10/13/2022
[50658.459784] Workqueue: rpciod rpc_async_schedule [sunrpc]
[50658.465850] pstate: 60400009 (nZCv daif +PAN -UAO -TCO BTYPE=--)
[50658.472576] pc : nfs4_put_copy+0x7c/0xc0 [nfsd]
[50658.477787] lr : nfsd4_cb_offload_release+0x1c/0x30 [nfsd]
[50658.483938] sp : ffff80002bfc3cb0
[50658.487928] x29: ffff80002bfc3cb0 x28: 0000000000000000 
[50658.493908] x27: ffff80002a5abc48 x26: ffffc99df3521e48 
[50658.499888] x25: 0000000000000001 x24: ffffc99df31d0008 
[50658.505867] x23: ffffc99df31d0008 x22: ffffc99df3521000 
[50658.511847] x21: 0000000000000000 x20: ffff2e8f1f85f620 
[50658.517826] x19: ffff4e9de19f6c70 x18: 0000000000000000 
[50658.523805] x17: 0000000000000000 x16: ffffc99df1c3be60 
[50658.529784] x15: ffff80008da63c28 x14: 0000000000000000 
[50658.535764] x13: 0000000000000030 x12: ffffffffffffffff 
[50658.541743] x11: 0000000000000040 x10: 0000000000000eb0 
[50658.547723] x9 : ffffc99d7b250fcc x8 : ffff4e9d91dace00 
[50658.553702] x7 : 0000000000000000 x6 : 000000000000003f 
[50658.559681] x5 : 0000000000000000 x4 : 0000000000000000 
[50658.565661] x3 : 0000000000000244 x2 : 00000000ffffffff 
[50658.571640] x1 : 0000000000000244 x0 : ffff4e9de19f6800 
[50658.577620] Call trace:
[50658.580758]  nfs4_put_copy+0x7c/0xc0 [nfsd]
[50658.585624]  nfsd4_cb_offload_release+0x1c/0x30 [nfsd]
[50658.591439]  nfsd4_cb_release+0x68/0x80 [nfsd]
[50658.596600]  rpc_free_task+0x3c/0x70 [sunrpc]
[50658.601647]  rpc_release_task+0xcc/0xe4 [sunrpc]
[50658.606950]  __rpc_execute+0x3e0/0x40c [sunrpc]
[50658.612167]  rpc_async_schedule+0x34/0x54 [sunrpc]
[50658.617633]  process_one_work+0x1d0/0x490
[50658.622315]  worker_thread+0x158/0x3d0
[50658.626740]  kthread+0x108/0x13c
[50658.630647]  ret_from_fork+0x10/0x18
[50658.634896] Code: d503201f 52800022 91091021 4b0203e2 (b822003f) 
[50658.641700] SMP: stopping secondary CPUs
[50658.648471] Starting crashdump kernel...
[50658.653072] Bye!
```

**【缺陷详情及分析指导参考链接】**

src-openEuler/kernel

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