Server panics with message kernel BUG at fs/nfs_common/grace.c:107!

Issue

• Server panics with the following call trace:

[4168707.470959] XFS (dm-35): Unmounting Filesystem
[4168707.477503] ------------[ cut here ]------------
[4168707.477692] kernel BUG at fs/nfs_common/grace.c:107!
[4168707.477874] invalid opcode: 0000 [#1] SMP 
[4168707.478073] Modules linked in: tcp_diag inet_diag xt_nat veth nls_utf8 isofs loop nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache ip_vs xt_conntrack ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_addrtype iptable_filter nf_nat nf_conntrack br_netfilter bridge ixgbevf binfmt_misc 8021q garp mrp stp llc bonding sunrpc dm_thin_pool dm_persistent_data dm_bio_prison dm_bufio vfat fat sb_edac intel_powerclamp coretemp intel_rapl iosf_mbi iTCO_wdt iTCO_vendor_support kvm_intel kvm irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel qla2xxx lrw gf128mul glue_helper ablk_helper cryptd sg scsi_transport_fc mei_me scsi_tgt pcspkr joydev mei i2c_i801 lpc_ich shpchp acpi_power_meter acpi_pad ip_tables xfs libcrc32c sd_mod
[4168707.480209]  crc_t10dif crct10dif_generic ahci libahci libata ixgbe igb crct10dif_pclmul crct10dif_common crc32c_intel megaraid_sas mdio i2c_algo_bit ptp i2c_core pps_core dca dm_mirror dm_region_hash dm_log dm_mod
[4168707.480833] CPU: 21 PID: 227675 Comm: kworker/u80:2 Kdump: loaded Not tainted 3.10.0-862.el7.x86_64 #1
[4168707.481195] Hardware name: Huawei RH2288H V3/BC11HGSA0, BIOS 3.63 05/19/2017
[4168707.481563] Workqueue: netns cleanup_net
[4168707.481753] task: ffffa16823bc6eb0 ti: ffffa167d96e4000 task.ti: ffffa167d96e4000
[4168707.482114] RIP: 0010:[<ffffffffc07fc0b2>]  [<ffffffffc07fc0b2>] grace_exit_net+0x32/0x40 [grace]
[4168707.482481] RSP: 0018:ffffa167d96e7d88  EFLAGS: 00010283
[4168707.482662] RAX: ffffa17aff2da7d0 RBX: ffffa1681cee6680 RCX: 0000000000000000
[4168707.483016] RDX: ffffa1682aeccd00 RSI: ffffffffc07fe020 RDI: ffffa1681cee6680
[4168707.483370] RBP: ffffa167d96e7db0 R08: ffffa187d8a7bec0 R09: 00000001802a0029
[4168707.483720] R10: 0000000000000001 R11: ffffde657c629e80 R12: ffffa167d96e7dd8
[4168707.484076] R13: ffffffffc07fe018 R14: ffffffffc07fe020 R15: 00000000ffffffff
[4168707.484431] FS:  0000000000000000(0000) GS:ffffa168bfec0000(0000) knlGS:0000000000000000
[4168707.484790] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[4168707.484973] CR2: 0000000000493230 CR3: 0000000a9900e000 CR4: 00000000003607e0
[4168707.485327] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[4168707.485683] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[4168707.486036] Call Trace:
[4168707.486223]  [<ffffffff8d1dfe9c>] ? ops_exit_list.isra.5+0x3c/0x70
[4168707.486415]  [<ffffffff8d1e0f40>] cleanup_net+0x1d0/0x2c0
[4168707.486609]  [<ffffffff8ccb2dff>] process_one_work+0x17f/0x440
[4168707.486799]  [<ffffffff8ccb3ac6>] worker_thread+0x126/0x3c0
[4168707.486992]  [<ffffffff8ccb39a0>] ? manage_workers.isra.24+0x2a0/0x2a0
[4168707.487188]  [<ffffffff8ccbae31>] kthread+0xd1/0xe0
[4168707.487379]  [<ffffffff8ccbad60>] ? insert_kthread_work+0x40/0x40
[4168707.487575]  [<ffffffff8d31f637>] ret_from_fork_nospec_begin+0x21/0x21
[4168707.487765]  [<ffffffff8ccbad60>] ? insert_kthread_work+0x40/0x40
[4168707.487955] Code: f1 21 00 00 85 c0 48 8b 97 e8 0c 00 00 74 1a 3b 02 77 16 83 e8 01 48 98 48 8b 44 c2 18 48 85 c0 74 0b 48 39 00 75 04 f3 c3 0f 0b <0f> 0b 55 48 89 e5 e8 28 01 00 00 0f 1f 00 0f 1f 44 00 00 8b 05 
[4168707.488728] RIP  [<ffffffffc07fc0b2>] grace_exit_net+0x32/0x40 [grace]
[4168707.488894]  RSP <ffffa167d96e7d88>