【OLK-5.10】nfsd出现空指针解引用

```
[6510462.640942][T2903615] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000028
[6510462.651714][T2903615] Mem abort info:
[6510462.655886][T2903615]   ESR = 0x96000004
[6510462.660298][T2903615]   EC = 0x25: DABT (current EL), IL = 32 bits
[6510462.666959][T2903615]   SET = 0, FnV = 0
[6510462.671371][T2903615]   EA = 0, S1PTW = 0
[6510462.675851][T2903615] Data abort info:
[6510462.680065][T2903615]   ISV = 0, ISS = 0x00000004
[6510462.685248][T2903615]   CM = 0, WnR = 0
[6510462.689575][T2903615] user pgtable: 4k pages, 48-bit VAs, pgdp=00002080020cd000
[6510462.697686][T2903615] [0000000000000028] pgd=0000000000000000, p4d=0000000000000000
[6510462.706190][T2903615] Internal error: Oops: 96000004 [#1] SMP
[6510462.712453][T2903615] Modules linked in: netlink_diag rpcsec_gss_krb5 nfsv4 dns_resolver nfsv3 nfs fscache tcp_diag inet_diag xt_conntrack ipt_REJECT nf_reject_ipv4 xt_owner xt_connlimit nf_conncount nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c xt_multiport odc_core(OE) odc_base(OE) odc_intf(OE) ip6table_filter ip6_tables iptable_filter ip_tables isofs cdrom loop dm_mod uio_pci_generic uio vfio_pci vfio_virqfd vfio_iommu_type1 vfio cuse 8021q garp stp mrp llc rfkill vfat fat ipmi_ssif svcrdma(OE) rpcrdma(OE) xprtrdma(OE) ib_umad(OE) rdma_ucm(OE) rdma_cm(OE) ib_ipoib(OE) iw_cm(OE) acpi_ipmi ses ib_srpt(OE) ipmi_si enclosure ib_isert(OE) ib_iser(OE) ib_cm(OE) ipmi_devintf sg ipmi_msghandler hisi_uncore_ddrc_pmu hisi_uncore_hha_pmu hisi_uncore_l3c_pmu hisi_uncore_pmu nfsd auth_rpcgss nfs_acl lockd grace sch_fq_codel sunrpc fuse nfs_ssc ext4 mbcache jbd2 mlx5_ib(OE) ib_uverbs(OE) ib_core(OE) sd_mod t10_pi ghash_ce hisi_sas_v3_hw sha2_ce hisi_sas_main sha256_arm64 hclge sha1_ce
[6510462.712543][T2903615]  libsas ahci sbsa_gwdt mlx5_core(OE) libahci scsi_transport_sas hibmc_drm mlxfw(OE) drm_vram_helper megaraid_sas libata hns3 tls drm_ttm_helper nfit ttm psample host_edma_drv hnae3 mlxdevm(OE) auxiliary(OE) mlx_compat(OE) libnvdimm i2c_designware_platform i2c_designware_core hisi_trng_v2 sha512_generic sha512_arm64 aes_neon_bs aes_neon_blk aes_ce_blk crypto_simd cryptd aes_ce_cipher
[6510462.843527][T2903615] CPU: 91 PID: 2903615 Comm: nfsd Kdump: loaded Tainted: G           OE     5.10.0-153.12.0.92.oe2203sp2.aarch64 #1
[6510462.857056][T2903615] Hardware name: Inspur CS5280K2/BC82AMDV-5250, BIOS 7.35 09/09/2024
[6510462.866466][T2903615] pstate: 40400009 (nZcv daif +PAN -UAO -TCO BTYPE=--)
[6510462.874103][T2903615] pc : nfsd_read+0x78/0x1cc [nfsd]
[6510462.880087][T2903615] lr : nfsd_read+0x68/0x1cc [nfsd]
[6510462.886132][T2903615] sp : ffff80003c33bc80
[6510462.891008][T2903615] x29: ffff80003c33bc80 x28: 0000000000000000 
[6510462.897866][T2903615] x27: 0000000000000014 x26: 000000000000007a 
[6510462.904716][T2903615] x25: ffff0a4580a14a70 x24: ffff0a4580a20180 
[6510462.911568][T2903615] x23: ffff0a4580a20178 x22: 0000000000000000 
[6510462.918434][T2903615] x21: ffff0a4580a20008 x20: ffff0a4580a14000 
[6510462.925267][T2903615] x19: 0000000000000000 x18: 000000002f0e1dd3 
[6510462.932083][T2903615] x17: 000000006ed9eba1 x16: ffffb0d8cc1a1410 
[6510462.938926][T2903615] x15: 000000005316dd88 x14: 0000000000000000 
[6510462.945758][T2903615] x13: 0000000000000000 x12: 0000000000000000 
[6510462.952573][T2903615] x11: 0000000000000000 x10: 0000000000000000 
[6510462.959356][T2903615] x9 : ffffb0d8b75220cc x8 : ffff2a8c27497400 
[6510462.966175][T2903615] x7 : 0000000000000000 x6 : ffff0a439a886480 
[6510462.972944][T2903615] x5 : 0000000000000002 x4 : ffff0a45a4646ac8 
[6510462.979691][T2903615] x3 : 0000000000000002 x2 : 0000000000000000 
[6510462.986416][T2903615] x1 : 0000000000000001 x0 : ffff0a45a4646a80 
[6510462.993128][T2903615] Call trace:
[6510462.997016][T2903615]  nfsd_read+0x78/0x1cc [nfsd]
[6510463.002375][T2903615]  nfsd3_proc_read+0xa4/0xf4 [nfsd]
[6510463.008119][T2903615]  nfsd_dispatch+0xe4/0x1e0 [nfsd]
[6510463.013783][T2903615]  svc_process_common+0x4ec/0x730 [sunrpc]
[6510463.020127][T2903615]  svc_process+0x88/0xe0 [sunrpc]
[6510463.025677][T2903615]  nfsd+0xfc/0x160 [nfsd]
[6510463.030493][T2903615]  kthread+0x108/0x13c
[6510463.035028][T2903615]  ret_from_fork+0x10/0x18
[6510463.039895][T2903615] Code: 2a0003f3 350002a0 f9402be0 f9401802 (f9401440) 
[6510463.047339][T2903615] SMP: stopping secondary CPUs
[6510463.054851][T2903615] Starting crashdump kernel...
[6510463.060072][T2903615] Bye!
```
**二、缺陷分析结构反馈**
影响性分析说明：

缺陷严重等级:(Critical/High/Moderate/Low)

缺陷根因说明:

受影响版本排查(受影响/不受影响):
openEuler-20.03-LTS-SP4
openEuler-22.03-LTS-SP3
openEuler-22.03-LTS-SP4
openEuler-24.03-LTS
openEuler-24.03-LTS-SP1
openEuler-24.03-LTS-SP2

修复是否涉及abi变化(是/否):
openEuler-20.03-LTS-SP4
openEuler-22.03-LTS-SP3
openEuler-22.03-LTS-SP4
openEuler-24.03-LTS
openEuler-24.03-LTS-SP1
openEuler-24.03-LTS-SP2

GVP openEuler/kernel

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GVPopenEuler/kernel

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