System with 3rd party module crashed at RIP __kmalloc in sunrpc codepath.

Issue

• A system crashed at _kmalloc in sunrpc codepath.
• This system installs third party module: sisap and sisevt.
• Call Trace is like below.

[27426691.011118] stack segment: 0000 [#1] SMP PTI
[27426691.065334] CPU: 11 PID: 128321 Comm: kworker/u129:3 Kdump: loaded Tainted: P           OE    --------- -  - 4.18.0-193.14.3.el8_2.x86_64 #1
[27426691.219362] Hardware name: XXXXX
[27426691.363016] Workqueue: rpciod rpc_async_schedule [sunrpc]                                                                                              
[27426691.430729] RIP: 0010:__kmalloc+0xa0/0x200                   
[27426691.482861] Code: 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 5f a6 97 77 49 8b 28 48 85 ed 0f 84 21 01 00 00 41 8b 47 20 4d 8b 07 48 8d 4a 01 <48> 8b
 5c 05 00 48 89 e8 65 49 0f c7 08 0f 94 c0 84 c0 74 c5 41 8b
[27426691.710732] RSP: 0018:ffffb7bf605bfbf8 EFLAGS: 00010286
[27426691.776389] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000020c0e0ee
[27426691.864898] RDX: 0000000020c0e0ed RSI: 0000000000600000 RDI: ffff997407c07c00
[27426691.953409] RBP: ff997b6f0e4078ff R08: 000000000002e040 R09: 0000000000000001
[27426692.041919] R10: ffffb7bf605bfd1c R11: ffff9992ff6e8bc0 R12: 0000000000600000
[27426692.130429] R13: 0000000000000004 R14: ffff997407c07c00 R15: ffff997407c07c00
[27426692.218943] FS:  0000000000000000(0000) GS:ffff9992ff6c0000(0000) knlGS:0000000000000000
[27426692.318897] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[27426692.390768] CR2: 00007fe27e07e000 CR3: 00000034eee0a002 CR4: 00000000003626e0
[27426692.479278] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[27426692.567790] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[27426692.656303] Call Trace:
[27426692.688683]  ? xdr_stream_decode_string_dup+0x75/0x100 [sunrpc]
[27426692.762674]  xdr_stream_decode_string_dup+0x75/0x100 [sunrpc]
[27426692.834604]  decode_getfattr_attrs+0x7a5/0x1090 [nfsv4]
[27426692.900239]  ? select_task_rq_fair+0xad8/0xdb0
[27426692.956557]  decode_getfattr_generic.constprop.117+0x148/0x240 [nfsv4]
[27426693.037797]  ? rpc_exit+0x30/0x30 [sunrpc]
[27426693.089944]  ? call_bind_status+0x240/0x240 [sunrpc]
[27426693.152491]  nfs4_xdr_dec_open_noattr+0xc7/0x100 [nfsv4]
[27426693.219173]  ? rpc_decode_header+0xec/0x560 [sunrpc]
[27426693.281688]  call_decode+0x168/0x190 [sunrpc]
[27426693.336957]  __rpc_execute+0x85/0x340 [sunrpc]
[27426693.393234]  ? finish_task_switch+0xd7/0x2b0
[27426693.447454]  rpc_async_schedule+0x29/0x40 [sunrpc]
[27426693.507892]  process_one_work+0x1a7/0x3b0
[27426693.558982]  worker_thread+0x30/0x390
[27426693.605908]  ? create_worker+0x1a0/0x1a0
[27426693.655940]  kthread+0x112/0x130
[27426693.697674]  ? kthread_flush_work_fn+0x10/0x10
[27426693.753948]  ret_from_fork+0x35/0x40
[27426693.799836] Modules linked in: sisap(POE) sisevt(PE) nf_conntrack_netlink vxlan ip6_udp_tunnel udp_tunnel xt_CT xt_mac xt_set xt_physdev ip_set_hash_ne
t ip_set vhost_net vhost tap tun veth xsk_diag raw_diag unix_diag af_packet_diag netlink_diag tcp_diag udp_diag inet_diag rpcsec_gss_krb5 auth_rpcgss overlay
 nfsv4 dns_resolver nfs lockd grace fscache sch_ingress bonding rpcrdma ib_isert iscsi_target_mod ib_iser ib_srpt target_core_mod ib_srp scsi_transport_srp i
b_ipoib rdma_ucm ib_umad iw_cxgb4 ib_uverbs rdma_cm iw_cm ib_cm ib_core nfnetlink_cttimeout ipmi_ssif intel_rapl_msr mxm_wmi iTCO_wdt iTCO_vendor_support nf_
log_ipv6 nf_log_ipv4 nf_log_common intel_rapl_common nft_limit nls_utf8 isofs sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp nft_counter kvm_intel kv
m irqbypass intel_cstate intel_uncore mei_me xt_LOG intel_rapl_perf joydev pcspkr mei i2c_i801 lpc_ich xt_limit xt_multiport xt_comment xt_state ipmi_si xt_c
onntrack nft_compat ipmi_devintf ipmi_msghandler wmi
[27426693.799873]  acpi_power_meter
...
[27426694.835845]  nf_tables nfnetlink openvswitch nf_conntrack_ipv6 nf_nat_ipv6 nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_defrag_ipv6 nf_conncount nf_
nat nf_conntrack br_netfilter bridge stp llc ip_tables xfs libcrc32c dm_multipath sd_mod sg mgag200 drm_vram_helper i2c_algo_bit drm_kms_helper syscopyarea s
ysfillrect sysimgblt fb_sys_fops ttm crct10dif_pclmul crc32_pclmul ahci crc32c_intel drm libahci ixgbe ghash_clmulni_intel libata megaraid_sas be2net dca mdi
o sunrpc dm_mirror dm_region_hash dm_log dm_mod be2iscsi bnx2i cnic uio cxgb4i cxgb4 libcxgbi libcxgb qla4xxx iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscs
i scsi_transport_iscsi