NULL pointer dereference while attach conflict with free

[ 1511.129462] va mapped to hugepage, please free it and realloc va
[ 1572.143300] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[ 1572.152917] Mem abort info:
[ 1572.156536]   ESR = 0x0000000096000006
[ 1572.161100]   EC = 0x25: DABT (current EL), IL = 32 bits
[ 1572.167283]   SET = 0, FnV = 0
[ 1572.171135]   EA = 0, S1PTW = 0
[ 1572.175268]   FSC = 0x06: level 2 translation fault
[ 1572.180957] Data abort info:
[ 1572.184666]   ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000
[ 1572.190969]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
[ 1572.196846]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
[ 1572.202971] user pgtable: 4k pages, 48-bit VAs, pgdp=000020300acd7000
[ 1572.210227] [0000000000000000] pgd=0800203008421403, p4d=0800203008421403, pud=0800203008422403, pmd=0000000000000000
[ 1572.221645] Internal error: Oops: 0000000096000006 [#1] SMP
[ 1572.228016] Modules linked in: zcopy xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables tun br_netfilter bridge stp llc overlay rfkill rpcrdma rdma_ucm ib_srpt ib_isert iscsi_target_mod target_core_mod ib_iser rdma_cm iw_cm ib_cm libiscsi scsi_transport_iscsi vfat fat ipmi_ssif hns_roce_hw_v2 acpi_ipmi ib_uverbs ipmi_si arm_spe_pmu arm_smmuv3_pmu sg ib_core ipmi_devintf hisi_uncore_ddrc_pmu hisi_uncore_l3c_pmu hisi_uncore_hha_pmu ipmi_msghandler hisi_uncore_pmu cppc_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc fuse ext4 mbcache jbd2 sd_mod t10_pi crc64_rocksoft_generic crc64_rocksoft crc64 hibmc_drm drm_vram_helper drm_ttm_helper ttm drm_display_helper drm_kms_helper hisi_sas_v3_hw hisi_sas_main hinic realtek libsas drm ahci libahci scsi_transport_sas hclge libata hns3 nfit libnvdimm crct10dif_ce ghash_ce
[ 1572.228147]  sha2_ce host_edma_drv sha256_arm64 sha1_ce sbsa_gwdt i2c_designware_platform hnae3 i2c_designware_core aes_ce_blk aes_ce_cipher [last unloaded: zcopy]
[ 1572.337548] CPU: 107 PID: 151805 Comm: ioctl_zcopy_too Kdump: loaded Not tainted 6.6.0-f3180605d2a8 #1
[ 1572.348242] Hardware name: Huawei Taishan 2280 V2/BC82AMDD, BIOS 6.57 05/17/2023
[ 1572.357052] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 1572.365448] pc : attach_pte_range+0x190/0x9a0 [zcopy]
[ 1572.371622] lr : attach_pte_range+0xd4/0x9a0 [zcopy]
[ 1572.377702] sp : ffff8000be8abb20
[ 1572.382122] x29: ffff8000be8abb80 x28: 0000ffff90e00000 x27: ffffa651cb444d08
[ 1572.390674] x26: 0400000000000001 x25: 0000000000000000 x24: ffff203017961000
[ 1572.399237] x23: 0000ffff87400000 x22: 0010000000000001 x21: fffffc80c05e5840
[ 1572.407819] x20: ffff2020259111d0 x19: ffffa651cb443c40 x18: ffff8000be8ab9b0
[ 1572.416377] x17: 0000000000000000 x16: ffffa651e40182b0 x15: ffffffffffffffbc
[ 1572.424937] x14: ffffa651e8b17c58 x13: ffff20301695a000 x12: ffffa651cb444a58
[ 1572.433497] x11: 0000000000000154 x10: 0000ffff91000000 x9 : ffffa651cb43e574
[ 1572.442055] x8 : 0000000000000000 x7 : ffff20300758a880 x6 : 0000000000200000
[ 1572.450616] x5 : ffff203008b1b438 x4 : 0000000000000001 x3 : 00000000000001da
[ 1572.459188] x2 : fffffc0000000000 x1 : 0000000000000000 x0 : 00000000000001da
[ 1572.467753] Call trace:
[ 1572.471299]  attach_pte_range+0x190/0x9a0 [zcopy]
[ 1572.477099]  attach_page_range+0x22c/0x618 [zcopy]
[ 1572.482980]  attach_pages+0x2b8/0x8b8 [zcopy]
[ 1572.488427]  zcopy_ioctl+0xe8/0x168 [zcopy]
[ 1572.493687]  vfs_ioctl+0x3c/0xa8
[ 1572.497991]  __se_sys_ioctl+0x12c/0x160
[ 1572.502894]  __arm64_sys_ioctl+0x40/0x68
[ 1572.507885]  invoke_syscall+0x8c/0x1d0
[ 1572.512700]  el0_svc_common.constprop.0+0x64/0x1d0
[ 1572.518549]  do_el0_svc+0x54/0xe0
[ 1572.522922]  el0_slow_syscall+0x44/0x1e8
[ 1572.527909]  el0t_64_sync_handler+0xc0/0xc8
[ 1572.533135]  el0t_64_sync+0x188/0x190
[ 1572.537840] Code: 8b000318 8b0102f7 eb1c015f 54000200 (f940033b) 
[ 1572.544965] SMP: stopping secondary CPUs
[ 1572.552065] Starting crashdump kernel...
[ 1572.557037] Bye!

src-openEuler/kernel

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