Kernel panic at ceph_put_snap_realm+0x21

Issue

• Kernel panic with below logs:

[647873.801594] ceph: check_quota_exceeded: ino (100001684f3.fffffffffffffffe) null i_snap_realm
[647873.801650] BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
[647873.801681] IP: [<ffffffffc08f76d1>] ceph_put_snap_realm+0x21/0xe0 [ceph]
[647873.801716] PGD 8000001b9eb6d067 PUD 1785528067 PMD 0
[647873.801739] Oops: 0002 [#1] SMP
[647873.801755] Modules linked in: ipmi_si binfmt_misc mpt3sas mpt2sas raid_class scsi_transport_sas mptctl mptbase ceph rbd libceph dns_resolver dell_rbu bonding nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack_ftp nf_conntrack nf_log_ipv4 nf_log_common xt_LOG iptable_filter sb_edac intel_powerclamp coretemp intel_rapl iTCO_wdt iTCO_vendor_support iosf_mbi vfat fat kvm_intel mxm_wmi kvm dcdbas irqbypass crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd pcspkr joydev mei_me ipmi_ssif mei lpc_ich sg ipmi_devintf ioatdma 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 drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm uas ahci libahci drm usb_storage
[647873.802127]  libata igb crct10dif_pclmul crct10dif_common crc32c_intel megaraid_sas ptp pps_core drm_panel_orientation_quirks dca i2c_algo_bit dm_mirror dm_region_hash dm_log dm_mod [last unloaded: ipmi_si]
[647873.802204] CPU: 8 PID: 1837143 Comm: java Kdump: loaded Not tainted 3.10.0-1160.2.1.el7.x86_64 #1
[647873.802253] Hardware name: Dell Inc. PowerEdge R630/0CNCJW, BIOS 2.11.0 11/02/2019
[647873.802289] task: ffff8e5485694200 ti: ffff8e55e4730000 task.ti: ffff8e55e4730000
[647873.802314] RIP: 0010:[<ffffffffc08f76d1>]  [<ffffffffc08f76d1>] ceph_put_snap_realm+0x21/0xe0 [ceph]
[647873.803405] RSP: 0018:ffff8e55e4733db8  EFLAGS: 00010246
[647873.804438] RAX: 0000000000000050 RBX: 0000000000000000 RCX: 0000000000000000
[647873.805570] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8e24bbbdb800
[647873.806693] RBP: ffff8e55e4733dd0 R08: 0000000000000000 R09: ffff8e24df3b2000
[647873.807845] R10: 0000000000033089 R11: 0000000000000001 R12: ffff8e24bbbdb800
[647873.808960] R13: 0000000000000000 R14: 00000000000001ff R15: 0000000000000000
[647873.810085] FS:  00007ee1f9ecf700(0000) GS:ffff8e523fb00000(0000) knlGS:0000000000000000
[647873.811149] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[647873.812246] CR2: 0000000000000010 CR3: 000000232e3f2000 CR4: 00000000001607e0
[647873.813461] Call Trace:
[647873.814524]  [<ffffffffc08fb6ab>] check_quota_exceeded+0x1bb/0x270 [ceph]
[647873.815636]  [<ffffffffc08fba11>] ceph_quota_is_max_files_exceeded+0x41/0x60 [ceph]
[647873.816762]  [<ffffffffc08e128a>] ceph_mkdir+0x8a/0x280 [ceph]
[647873.817829]  [<ffffffff94e5b03f>] vfs_mkdir+0x10f/0x1d0
[647873.818896]  [<ffffffff94e6133a>] SyS_mkdirat+0xca/0x100
[647873.819906]  [<ffffffff94e61389>] SyS_mkdir+0x19/0x20
[647873.820918]  [<ffffffff95393f92>] system_call_fastpath+0x25/0x2a
[647873.821937] Code: 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 55 41 54 49 89 fc 53 f6 05 1a 9a 02 00 04 48 89 f3 0f 85 89 00 00 00 <f0> ff 4b 10 0f 94 c0 84 c0 75 0c 5b 41 5c 41 5d 5d c3 0f 1f 44
[647873.824093] RIP  [<ffffffffc08f76d1>] ceph_put_snap_realm+0x21/0xe0 [ceph]
[647873.825164]  RSP <ffff8e55e4733db8>
[647873.826195] CR2: 0000000000000010