RHEL7.2: nfs4 server kernel crashes in nfs4_put_stid while dereferencing nfs4_stid pointer or crashes in find_openstateowner_str_locked.isra.59

Issue

• kernel list_del corruption warnings followed by kernel crash of nfsd4's kworker task for laundromat_main in nfs4_put_stid

[88415.153187] ------------[ cut here ]------------
[88415.153194] WARNING: at lib/list_debug.c:59 __list_del_entry+0xa1/0xd0()
[88415.153195] list_del corruption. prev->next should be ffff88005d315ef0, but was ffff88005d3146e0
[88415.153196] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache iptable_filter fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 bridge stp llc appassure_vss(POE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_round_robin intel_powerclamp coretemp intel_rapl kvm_intel kvm crc32_pclmul ghash_clmulni_intel ipmi_devintf aesni_intel lrw gf128mul glue_helper iTCO_wdt ablk_helper cryptd iTCO_vendor_support mxm_wmi dcdbas pcspkr sb_edac sg edac_core mei_me lpc_ich mei mfd_core shpchp ipmi_si acpi_power_meter ipmi_msghandler wmi dm_multipath nfsd nfs_acl lockd binfmt_misc auth_rpcgss grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm crct10dif_pclmul crct10dif_common
[88415.153227]  crc32c_intel drm ahci tg3 libahci i2c_core ptp libata megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod
[88415.153234] CPU: 8 PID: 9631 Comm: nfsd Tainted: P           OE  ------------   3.10.0-327.36.1.el7.x86_64 #1
[88415.153235] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 2.0.1 04/11/2016
[88415.153236]  ffff88041fc8fc10 00000000dd3855fa ffff88041fc8fbc8 ffffffff81636301
[88415.153239]  ffff88041fc8fc00 ffffffff8107b260 ffff88005d315ef0 ffff88005d316070
[88415.153240]  ffff88034c867000 ffff880412048200 ffff88034c867340 ffff88041fc8fc68
[88415.153242] Call Trace:
[88415.153248]  [<ffffffff81636301>] dump_stack+0x19/0x1b
[88415.153251]  [<ffffffff8107b260>] warn_slowpath_common+0x70/0xb0
[88415.153253]  [<ffffffff8107b2fc>] warn_slowpath_fmt+0x5c/0x80
[88415.153263]  [<ffffffffa038ff8b>] ? find_stateid_by_type+0x6b/0xa0 [nfsd]
[88415.153265]  [<ffffffff8130c671>] __list_del_entry+0xa1/0xd0
[88415.153271]  [<ffffffffa038f9ab>] nfs4_unhash_openowner+0x1b/0x40 [nfsd]
[88415.153275]  [<ffffffffa038ed53>] nfs4_put_stateowner+0x33/0x60 [nfsd]
[88415.153279]  [<ffffffffa038ff00>] nfs4_free_ol_stateid+0x20/0x40 [nfsd]
[88415.153284]  [<ffffffffa0391568>] nfs4_put_stid+0x48/0x80 [nfsd]
[88415.153289]  [<ffffffffa0396869>] nfsd4_close+0x139/0x310 [nfsd]
[88415.153293]  [<ffffffffa0384914>] nfsd4_proc_compound+0x4d4/0x7f0 [nfsd]
[88415.153298]  [<ffffffffa037012b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[88415.153310]  [<ffffffffa0156283>] svc_process_common+0x453/0x6f0 [sunrpc]
[88415.153316]  [<ffffffffa0156623>] svc_process+0x103/0x170 [sunrpc]
[88415.153320]  [<ffffffffa036faaf>] nfsd+0xdf/0x150 [nfsd]
[88415.153324]  [<ffffffffa036f9d0>] ? nfsd_destroy+0x80/0x80 [nfsd]
[88415.153327]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[88415.153329]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88415.153331]  [<ffffffff81646958>] ret_from_fork+0x58/0x90
[88415.153333]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88415.153334] ---[ end trace bbc5392fbd36ab2c ]---
[88665.388447] ------------[ cut here ]------------
[88665.388455] WARNING: at lib/list_debug.c:59 __list_del_entry+0xa1/0xd0()
[88665.388457] list_del corruption. prev->next should be ffff88005d315ef0, but was           (null)
[88665.388458] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache iptable_filter fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 bridge stp llc appassure_vss(POE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_round_robin intel_powerclamp coretemp intel_rapl kvm_intel kvm crc32_pclmul ghash_clmulni_intel ipmi_devintf aesni_intel lrw gf128mul glue_helper iTCO_wdt ablk_helper cryptd iTCO_vendor_support mxm_wmi dcdbas pcspkr sb_edac sg edac_core mei_me lpc_ich mei mfd_core shpchp ipmi_si acpi_power_meter ipmi_msghandler wmi dm_multipath nfsd nfs_acl lockd binfmt_misc auth_rpcgss grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm crct10dif_pclmul crct10dif_common
[88665.388491]  crc32c_intel drm ahci tg3 libahci i2c_core ptp libata megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod
[88665.388499] CPU: 5 PID: 9632 Comm: nfsd Tainted: P        W  OE  ------------   3.10.0-327.36.1.el7.x86_64 #1
[88665.388500] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 2.0.1 04/11/2016
[88665.388501]  ffff88046132bc20 00000000183422ce ffff88046132bbd8 ffffffff81636301
[88665.388504]  ffff88046132bc10 ffffffff8107b260 ffff88005d315ef0 ffff88046132bca0
[88665.388506]  ffff88005d316070 ffff8802adb48878 0000000000000000 ffff88046132bc78
[88665.388508] Call Trace:
[88665.388514]  [<ffffffff81636301>] dump_stack+0x19/0x1b
[88665.388530]  [<ffffffff8107b260>] warn_slowpath_common+0x70/0xb0
[88665.388532]  [<ffffffff8107b2fc>] warn_slowpath_fmt+0x5c/0x80
[88665.388534]  [<ffffffff8130c671>] __list_del_entry+0xa1/0xd0
[88665.388545]  [<ffffffffa03916c9>] release_openowner+0x59/0x110 [nfsd]
[88665.388551]  [<ffffffffa03918bb>] __destroy_client+0x11b/0x180 [nfsd]
[88665.388569]  [<ffffffffa0391942>] expire_client+0x22/0x30 [nfsd]
[88665.388575]  [<ffffffffa0393bad>] nfsd4_setclientid_confirm+0x1bd/0x290 [nfsd]
[88665.388580]  [<ffffffffa0384914>] nfsd4_proc_compound+0x4d4/0x7f0 [nfsd]
[88665.388585]  [<ffffffffa037012b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[88665.388597]  [<ffffffffa0156283>] svc_process_common+0x453/0x6f0 [sunrpc]
[88665.388605]  [<ffffffffa0156623>] svc_process+0x103/0x170 [sunrpc]
[88665.388609]  [<ffffffffa036faaf>] nfsd+0xdf/0x150 [nfsd]
[88665.388613]  [<ffffffffa036f9d0>] ? nfsd_destroy+0x80/0x80 [nfsd]
[88665.388616]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[88665.388618]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88665.388621]  [<ffffffff81646958>] ret_from_fork+0x58/0x90
[88665.388623]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88665.388624] ---[ end trace bbc5392fbd36ab2d ]---
[88694.124277] ------------[ cut here ]------------
[88694.124285] WARNING: at lib/list_debug.c:62 __list_del_entry+0x82/0xd0()
[88694.124287] list_del corruption. next->prev should be ffff88004313e5a8, but was ffff88005d316080
[88694.124288] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache iptable_filter fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 bridge stp llc appassure_vss(POE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_round_robin intel_powerclamp coretemp intel_rapl kvm_intel kvm crc32_pclmul ghash_clmulni_intel ipmi_devintf aesni_intel lrw gf128mul glue_helper iTCO_wdt ablk_helper cryptd iTCO_vendor_support mxm_wmi dcdbas pcspkr sb_edac sg edac_core mei_me lpc_ich mei mfd_core shpchp ipmi_si acpi_power_meter ipmi_msghandler wmi dm_multipath nfsd nfs_acl lockd binfmt_misc auth_rpcgss grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm crct10dif_pclmul crct10dif_common
[88694.124322]  crc32c_intel drm ahci tg3 libahci i2c_core ptp libata megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod
[88694.124330] CPU: 3 PID: 9225 Comm: kworker/u384:1 Tainted: P        W  OE  ------------   3.10.0-327.36.1.el7.x86_64 #1
[88694.124331] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 2.0.1 04/11/2016
[88694.124342] Workqueue: nfsd4 laundromat_main [nfsd]
[88694.124343]  ffff8800442c7d30 000000003b0e3606 ffff8800442c7ce8 ffffffff81636301
[88694.124345]  ffff8800442c7d20 ffffffff8107b260 ffff880354e8b1d0 00000000580028ad
[88694.124347]  ffff880461751d30 ffff88004313e5a8 ffff880461751c90 ffff8800442c7d88
[88694.124350] Call Trace:
[88694.124355]  [<ffffffff81636301>] dump_stack+0x19/0x1b
[88694.124358]  [<ffffffff8107b260>] warn_slowpath_common+0x70/0xb0
[88694.124360]  [<ffffffff8107b2fc>] warn_slowpath_fmt+0x5c/0x80
[88694.124367]  [<ffffffffa038ff0f>] ? nfs4_free_ol_stateid+0x2f/0x40 [nfsd]
[88694.124370]  [<ffffffff8130c652>] __list_del_entry+0x82/0xd0
[88694.124376]  [<ffffffffa03956e8>] laundromat_main+0x348/0x4e0 [nfsd]
[88694.124379]  [<ffffffff8109d69b>] process_one_work+0x17b/0x470
[88694.124381]  [<ffffffff8109e46b>] worker_thread+0x11b/0x400
[88694.124383]  [<ffffffff8109e350>] ? rescuer_thread+0x400/0x400
[88694.124397]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[88694.124400]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88694.124403]  [<ffffffff81646958>] ret_from_fork+0x58/0x90
[88694.124405]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88694.124407] ---[ end trace bbc5392fbd36ab2e ]---
[88694.124412] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[88694.124454] IP: [<ffffffffa0391530>] nfs4_put_stid+0x10/0x80 [nfsd]
[88694.124479] PGD 0 
[88694.124487] Oops: 0000 [#1] SMP 
[88694.124500] Modules linked in: rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache iptable_filter fuse btrfs zlib_deflate raid6_pq xor vfat msdos fat ext4 mbcache jbd2 bridge stp llc appassure_vss(POE) iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi dm_round_robin intel_powerclamp coretemp intel_rapl kvm_intel kvm crc32_pclmul ghash_clmulni_intel ipmi_devintf aesni_intel lrw gf128mul glue_helper iTCO_wdt ablk_helper cryptd iTCO_vendor_support mxm_wmi dcdbas pcspkr sb_edac sg edac_core mei_me lpc_ich mei mfd_core shpchp ipmi_si acpi_power_meter ipmi_msghandler wmi dm_multipath nfsd nfs_acl lockd binfmt_misc auth_rpcgss grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper ttm crct10dif_pclmul crct10dif_common
[88694.124792]  crc32c_intel drm ahci tg3 libahci i2c_core ptp libata megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod
[88694.124835] CPU: 3 PID: 9225 Comm: kworker/u384:1 Tainted: P        W  OE  ------------   3.10.0-327.36.1.el7.x86_64 #1
[88694.124866] Hardware name: Dell Inc. PowerEdge R430/03XKDV, BIOS 2.0.1 04/11/2016
[88694.124893] Workqueue: nfsd4 laundromat_main [nfsd]
[88694.124909] task: ffff880445c1f300 ti: ffff8800442c4000 task.ti: ffff8800442c4000
[88694.124941] RIP: 0010:[<ffffffffa0391530>]  [<ffffffffa0391530>] nfs4_put_stid+0x10/0x80 [nfsd]
[88694.124971] RSP: 0018:ffff8800442c7d78  EFLAGS: 00010296
[88694.124986] RAX: ffff88004313e5a8 RBX: 0000000000000000 RCX: dead000000200200
[88694.125006] RDX: ffff88004313e5a8 RSI: ffffea000d53a280 RDI: 0000000000000000
[88694.125026] RBP: ffff8800442c7d98 R08: ffff88004313e5a8 R09: 0000000180440038
[88694.125046] R10: ffffffffa038ff0f R11: ffffea000d53a280 R12: 00000000580028ad
[88694.125065] R13: ffff880461751d30 R14: ffff88004313e5a8 R15: ffff880461751c90
[88694.125086] FS:  0000000000000000(0000) GS:ffff88046c6c0000(0000) knlGS:0000000000000000
[88694.125108] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[88694.125124] CR2: 0000000000000018 CR3: 000000000194a000 CR4: 00000000001407e0
[88694.125144] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[88694.125164] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[88694.125183] Stack:
[88694.125189]  0000000000000000 00000000580028ad ffff880461751d30 ffff88004313e5a8
[88694.125214]  ffff8800442c7e18 ffffffffa039570b 000000000000000c 0000000000000000
[88694.125238]  0000000000000000 ffff880461751cb0 ffff8800741d1000 ffff880461751c00
[88694.125262] Call Trace:
[88694.125275]  [<ffffffffa039570b>] laundromat_main+0x36b/0x4e0 [nfsd]
[88694.125295]  [<ffffffff8109d69b>] process_one_work+0x17b/0x470
[88694.125312]  [<ffffffff8109e46b>] worker_thread+0x11b/0x400
[88694.125329]  [<ffffffff8109e350>] ? rescuer_thread+0x400/0x400
[88694.125346]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[88694.125362]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88694.125381]  [<ffffffff81646958>] ret_from_fork+0x58/0x90
[88694.125398]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[88694.125416] Code: 44 00 00 31 c0 eb ec 0f 1f 40 00 48 89 de 4c 89 ff e8 15 f7 e2 e0 31 c0 eb d9 90 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 41 54 53 <4c> 8b 6f 18 48 89 fb 4c 8b 77 20 4d 8d a5 40 03 00 00 4c 89 e6 
[88694.125517] RIP  [<ffffffffa0391530>] nfs4_put_stid+0x10/0x80 [nfsd]
[88694.126304]  RSP <ffff8800442c7d78>
[88694.127111] CR2: 0000000000000018

• kernel list_del corruption warnings followed by kernel crash of nfsd task for nfsd4_process_open1 in find_openstateowner_str_locked.isra.59

[328611.921084] ------------[ cut here ]------------
[328611.921092] WARNING: at lib/list_debug.c:59 __list_del_entry+0xa1/0xd0()
[328611.921093] list_del corruption. prev->next should be ffff88045b0fbfa8, but was ffff88045b0fbf30
[328611.921095] Modules linked in: mpt3sas mpt2sas raid_class scsi_transport_sas mptctl mptbase iptable_filter fuse btrfs zlib_deflate raid6_pq xor msdos ext4 mbcache jbd2 binfmt_misc bridge stp llc dell_rbu rpcsec_gss_krb5 arc4 nfsv4 md4 nls_utf8 nfs cifs fscache dns_resolver iTCO_wdt ipmi_devintf iTCO_vendor_support mxm_wmi dcdbas intel_powerclamp vfat coretemp intel_rapl fat kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd ipmi_ssif pcspkr sg sb_edac edac_core lpc_ich mei_me mfd_core mei shpchp ipmi_si ipmi_msghandler wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper crct10dif_pclmul crct10dif_common ttm
[328611.921139]  crc32c_intel drm ahci tg3 libahci i2c_core libata ptp megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: usb_storage]
[328611.921148] CPU: 16 PID: 3527 Comm: nfsd Tainted: G        W      ------------   3.10.0-327.36.2.el7.x86_64 #1
[328611.921149] Hardware name: Dell Inc. PowerEdge R730xd/072T6D, BIOS 2.1.7 06/16/2016
[328611.921150]  ffff883fc31dfc58 0000000011adfb38 ffff883fc31dfc10 ffffffff81636401
[328611.921155]  ffff883fc31dfc48 ffffffff8107b260 ffff88045b0fbfa8 ffff88045b0fbf98
[328611.921158]  ffff88076cfb4b04 ffff881fcb9b9000 ffff881fcb9b9340 ffff883fc31dfcb0
[328611.921161] Call Trace:
[328611.921168]  [<ffffffff81636401>] dump_stack+0x19/0x1b
[328611.921172]  [<ffffffff8107b260>] warn_slowpath_common+0x70/0xb0
[328611.921174]  [<ffffffff8107b2fc>] warn_slowpath_fmt+0x5c/0x80
[328611.921176]  [<ffffffff8130c671>] __list_del_entry+0xa1/0xd0
[328611.921179]  [<ffffffff8130c6ad>] list_del+0xd/0x30
[328611.921193]  [<ffffffffa03e6dce>] unhash_ol_stateid+0x4e/0x60 [nfsd]
[328611.921201]  [<ffffffffa03ee825>] nfsd4_close+0xf5/0x310 [nfsd]
[328611.921207]  [<ffffffffa03dc914>] nfsd4_proc_compound+0x4d4/0x7f0 [nfsd]
[328611.921212]  [<ffffffffa03c812b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[328611.921230]  [<ffffffffa0163283>] svc_process_common+0x453/0x6f0 [sunrpc]
[328611.921238]  [<ffffffffa0163623>] svc_process+0x103/0x170 [sunrpc]
[328611.921243]  [<ffffffffa03c7aaf>] nfsd+0xdf/0x150 [nfsd]
[328611.921247]  [<ffffffffa03c79d0>] ? nfsd_destroy+0x80/0x80 [nfsd]
[328611.921252]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[328611.921254]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[328611.921259]  [<ffffffff81646a58>] ret_from_fork+0x58/0x90
[328611.921261]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[328611.921262] ---[ end trace f4285d0ec00eb93b ]---
[328611.922511] BUG: unable to handle kernel NULL pointer dereference at 0000000000000178
[328611.922579] IP: [<ffffffffa03e7478>] find_openstateowner_str_locked.isra.59+0x38/0x80 [nfsd]
[328611.922618] PGD 0 
[328611.922628] Oops: 0000 [#1] SMP 
[328611.922645] Modules linked in: mpt3sas mpt2sas raid_class scsi_transport_sas mptctl mptbase iptable_filter fuse btrfs zlib_deflate raid6_pq xor msdos ext4 mbcache jbd2 binfmt_misc bridge stp llc dell_rbu rpcsec_gss_krb5 arc4 nfsv4 md4 nls_utf8 nfs cifs fscache dns_resolver iTCO_wdt ipmi_devintf iTCO_vendor_support mxm_wmi dcdbas intel_powerclamp vfat coretemp intel_rapl fat kvm_intel kvm crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd ipmi_ssif pcspkr sg sb_edac edac_core lpc_ich mei_me mfd_core mei shpchp ipmi_si ipmi_msghandler wmi acpi_power_meter nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic mgag200 syscopyarea sysfillrect sysimgblt i2c_algo_bit drm_kms_helper crct10dif_pclmul crct10dif_common ttm
[328611.922983]  crc32c_intel drm ahci tg3 libahci i2c_core libata ptp megaraid_sas pps_core dm_mirror dm_region_hash dm_log dm_mod [last unloaded: usb_storage]
[328611.923036] CPU: 34 PID: 3527 Comm: nfsd Tainted: G        W      ------------   3.10.0-327.36.2.el7.x86_64 #1
[328611.923068] Hardware name: Dell Inc. PowerEdge R730xd/072T6D, BIOS 2.1.7 06/16/2016
[328611.923093] task: ffff881fc6a4ae00 ti: ffff883fc31dc000 task.ti: ffff883fc31dc000
[328611.923117] RIP: 0010:[<ffffffffa03e7478>]  [<ffffffffa03e7478>] find_openstateowner_str_locked.isra.59+0x38/0x80 [nfsd]
[328611.923157] RSP: 0018:ffff883fc31dfcc8  EFLAGS: 00010282
[328611.923175] RAX: 00000000ffffff91 RBX: 0000000000000000 RCX: 000000000000006f
[328611.923226] RDX: 0000000000000018 RSI: ffff88147b0200d0 RDI: ffff881fcb8e2b20
[328611.923253] RBP: ffff883fc31dfce0 R08: ffff881fcb9b9000 R09: ffffffffa03ebfb1
[328611.923277] R10: 0000000000000000 R11: ffff881fc5b323c0 R12: ffff881fce0d8440
[328611.923300] R13: ffff881fc5b323e0 R14: ffff881fcb9b9000 R15: ffff883fccf5ba00
[328611.923325] FS:  0000000000000000(0000) GS:ffff881ffea40000(0000) knlGS:0000000000000000
[328611.923352] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[328611.923372] CR2: 0000000000000178 CR3: 000000000194a000 CR4: 00000000003407e0
[328611.923412] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[328611.923436] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[328611.923462] Stack:
[328611.923471]  ffff881fc5b323e0 ffff881fc5b33068 0000000000000044 ffff883fc31dfd28
[328611.923520]  ffffffffa03ec051 0000000000000000 ffff881fcb9b9340 ffff881fc5b323e0
[328611.923554]  ffff881fc5b33068 ffff881fc5b33068 ffff881fc4ce2000 ffff883fccf5ba00
[328611.923587] Call Trace:
[328611.923606]  [<ffffffffa03ec051>] nfsd4_process_open1+0x101/0x360 [nfsd]
[328611.923637]  [<ffffffffa03dbcd9>] nfsd4_open+0xe9/0x850 [nfsd]
[328611.923662]  [<ffffffffa03dc914>] nfsd4_proc_compound+0x4d4/0x7f0 [nfsd]
[328611.923690]  [<ffffffffa03c812b>] nfsd_dispatch+0xbb/0x200 [nfsd]
[328611.923724]  [<ffffffffa0163283>] svc_process_common+0x453/0x6f0 [sunrpc]
[328611.923755]  [<ffffffffa0163623>] svc_process+0x103/0x170 [sunrpc]
[328611.923780]  [<ffffffffa03c7aaf>] nfsd+0xdf/0x150 [nfsd]
[328611.923803]  [<ffffffffa03c79d0>] ? nfsd_destroy+0x80/0x80 [nfsd]
[328611.924663]  [<ffffffff810a5b8f>] kthread+0xcf/0xe0
[328611.925510]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[328611.926422]  [<ffffffff81646a58>] ret_from_fork+0x58/0x90
[328611.927214]  [<ffffffff810a5ac0>] ? kthread_create_on_node+0x140/0x140
[328611.928106] Code: 89 e5 41 55 49 89 f5 41 54 4c 8d 24 3a 53 49 8b 1c 24 49 39 dc 75 14 eb 4a 66 2e 0f 1f 84 00 00 00 00 00 48 8b 1b 49 39 dc 74 38 <80> bb 78 01 00 00 00 74 ef 8b 53 38 41 3b 95 b0 00 00 00 75 e3 
[328611.929826] RIP  [<ffffffffa03e7478>] find_openstateowner_str_locked.isra.59+0x38/0x80 [nfsd]
[328611.930724]  RSP <ffff883fc31dfcc8>
[328611.931652] CR2: 0000000000000178