Kernel panic at vnlayer_get_root_mnt+21 due to a null pointer dereference

Issue

• Kernel panic at vnlayer_get_root_mnt+21 due to a null pointer dereference with the following call traces:

[2677496.953705] BUG: unable to handle kernel NULL pointer dereference at 0000000000000018
[2677496.953879] PGD 40f021b067 P4D 40f021b067 PUD 4191d2d067 PMD 0 
[2677496.953959] Oops: 0000 [#1] SMP NOPTI
[2677496.954034] CPU: 14 PID: 3990356 Comm: java Kdump: loaded Tainted: PWOEX ----------- 4.18.0-425.10.1.el8_7.x86_64 #1
[2677496.954187] Hardware name: HPE ProLiant DL385 Gen10 Plus/ProLiant DL385 Gen10 Plus, BIOS A42 02/06/2023
[2677496.954268] RIP: 0010:vnlayer_get_root_mnt+0x15/0x1e [mvfs]
[2677496.954363] Code: 00 48 8b 80 18 0b 00 00 48 8b 40 20 48 8b 40 30 e9 a6 f6 51 ed 0f 1f 44 00 00 65 48 8b 04 25 40 5c 01 00 48 8b 80 18 0b 00 00 <48> 8b 78 18 e9 d8 d0 c9 ec 0f 1f 44 00 00 65 48 8b 04 25 40 5c 01
[2677496.954539] RSP: 0018:ffffac85f6c137e8 EFLAGS: 00010246
[2677496.954627] RAX: 0000000000000000 RBX: ffff916546703c00 RCX: 0000000000000000
[2677496.954719] RDX: ffff9141f5aedac0 RSI: ffffac85f6c13848 RDI: 0000000000000000
[2677496.954812] RBP: ffffac85f6c137f0 R08: 0038034986daabfd R09: ffffffffc10946b0
[2677496.954907] R10: 0000000000000000 R11: 0000000000000100 R12: ffffac85f6c13848
[2677496.955003] R13: ffffac85f6c13998 R14: 0000000000000000 R15: ffffac85f6c13910
[2677496.955100] FS:  0000000000000000(0000) GS:ffff915cfeb80000(0000) knlGS:0000000000000000
[2677496.955202] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2677496.955300] CR2: 0000000000000018 CR3: 0000004623c48000 CR4: 0000000000350ee0
[2677496.955403] Call Trace:
[2677496.955503]  mvop_linux_lookup_storage_file+0x47/0xe2 [mvfs]
[2677496.955621]  mfs_getcleartext+0x6a4/0xd75 [mvfs]
[2677496.955735]  ? rpc_destroy_wait_queue+0x10/0x10 [sunrpc]
[2677496.955856]  ? _copy_to_iter+0x14f/0x3d0
[2677496.955963]  mvfs_pre_rdwr+0x170/0x28d [mvfs]
[2677496.956075]  mvfs_rdwr_ctx+0x68/0x575 [mvfs]
[2677496.956188]  vnode_fop_rdwr_iter+0x12b/0x179 [mvfs]
[2677496.956305]  new_sync_read+0x10f/0x160
[2677496.956414]  0xffffffffc098dc95
[2677496.956523]  ? 0xffffffffc098db01
[2677496.956632]  ? cshook_systemcalltable_pre_compat_sys_ioctl+0x293d8/0x312f0 [falcon_lsm_serviceable]
[2677496.956749]  ? _ZdlPv+0x3cdef/0x3e200 [falcon_lsm_serviceable]
[2677496.956862]  ? _ZdlPv+0x3cfe1/0x3e200 [falcon_lsm_serviceable]
[2677496.956974]  ? cshook_systemcalltable_pre_compat_sys_ioctl+0x28b5d/0x312f0 [falcon_lsm_serviceable]
[2677496.957094]  ? __kmalloc+0x113/0x250
[2677496.957207]  ? _ZdlPv+0x3d16a/0x3e200 [falcon_lsm_serviceable]
[2677496.957324]  ? _ZdlPv+0x3d217/0x3e200 [falcon_lsm_serviceable]
[2677496.957440]  ? cshook_security_file_free_security+0x135/0x51c0 [falcon_lsm_serviceable]
[2677496.957565]  ? pinnedhook_security_file_free_security+0x37/0x50 [falcon_lsm_pinned_14812]
[2677496.957692]  ? security_file_free+0x22/0x60
[2677496.957811]  ? __fput+0x12c/0x250
[2677496.957927]  ? task_work_run+0x8a/0xb0
[2677496.958045]  ? do_exit+0x34d/0xb10
[2677496.958163]  ? do_group_exit+0x3a/0xa0
[2677496.958278]  ? get_signal+0x158/0x870
[2677496.958394]  ? do_futex+0x2f9/0x4d0
[2677496.958512]  ? do_signal+0x36/0x690
[2677496.958632]  ? audit_filter_inodes+0x2e/0x100
[2677496.958750]  ? audit_reset_context.part.16+0x29f/0x2f0
[2677496.958866]  ? exit_to_usermode_loop+0x89/0x100
[2677496.958982]  ? do_syscall_64+0x19c/0x1b0
[2677496.959094]  ? entry_SYSCALL_64_after_hwframe+0x61/0xc6