System crash in vx_bio_associate_blkg()

Issue

• System crash in vx_bio_associate_blkg():

[2352016.230929] BUG: unable to handle kernel NULL pointer dereference at 0000000000000520
[2352016.232019] PGD 0 P4D 0 
[2352016.233059] Oops: 0000 [#1] SMP PTI
[2352016.233979] CPU: 2 PID: 3866763 Comm: vx_naio_worker Kdump: loaded Tainted: P        W  OE    --------- -  - 4.18.0-305.12.1.el8_4.x86_64 #1
[2352016.234966] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[2352016.236008] RIP: 0010:vx_bio_associate_blkg+0x38/0x80 [vxfs]
....
[2352016.239029] RSP: 0018:ffffa550ac3bf710 EFLAGS: 00010246
[2352016.240063] RAX: 0000000000000000 RBX: ffff925db096a100 RCX: 0000000000000000
[2352016.241089] RDX: ffff925cea27df00 RSI: 0000000000000000 RDI: ffff925db096a100
[2352016.242119] RBP: ffffa550ac3bf900 R08: ffff925db096a100 R09: 0000000000000000
[2352016.243215] R10: 0000000000000000 R11: 0000000000000000 R12: ffff925735a2f570
[2352016.244359] R13: ffff925dae67d680 R14: ffff925735a2f420 R15: ffff925735a2f400
[2352016.245343] FS:  0000000000000000(0000) GS:ffff925df5e80000(0000) knlGS:0000000000000000
[2352016.246314] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[2352016.247279] CR2: 0000000000000520 CR3: 0000000290e10001 CR4: 00000000001706e0
[2352016.248265] Call Trace:
[2352016.249316]  vx_dio_physio+0x16a3/0x32a0 [vxfs]
[2352016.250350]  ? vx_te_bufread+0x1ba/0x3e0 [vxfs]
[2352016.251406]  ? vx_bc_do_brelse+0xd9/0x2c0 [vxfs]
[2352016.252384]  ? finish_wait+0x80/0x80
[2352016.253440]  ? mempool_alloc+0x67/0x190
[2352016.254389]  ? mempool_alloc+0x67/0x190
[2352016.255305]  ? find_get_pages_range_tag+0x81/0x360
[2352016.256251]  ? vx_dio_rdwri+0x8fa/0x1350 [vxfs]
[2352016.257164]  vx_dio_rdwri+0x8fa/0x1350 [vxfs]
[2352016.258263]  vx_dio_read+0x1b6/0x370 [vxfs]
[2352016.259172]  ? vx_rwsleep_rec_unlock+0x1a/0xd0 [vxfs]
[2352016.260066]  vx_read_common_noinline+0x6fe/0x9e0 [vxfs]
[2352016.260961]  vx_read1+0x60b/0xc20 [vxfs]
[2352016.261826]  ? vx_rwsleep_rec_lock+0x1b/0xe0 [vxfs]
[2352016.262779]  ? vx_recsmp_rangelock+0x14/0x30 [vxfs]
[2352016.263590]  ? vx_rwsleep_rec_unlock+0x1a/0xd0 [vxfs]
[2352016.264391]  vx_vop_read+0x82/0x130 [vxfs]
[2352016.265180]  vx_naio_do_work+0x28b/0x550 [vxfs]
[2352016.265964]  vx_naio_worker+0x143/0x330 [vxfs]
[2352016.266755]  ? vx_naio_checks.isra.8.constprop.9+0x310/0x310 [vxfs]
[2352016.267549]  ? vx_osdep_deinit+0x1b0/0x1b0 [vxfs]
[2352016.268300]  vx_kthread_init+0x22/0x30 [vxfs]
....

• In some cases, the message/issue detailed in WARNING: at fs/inode.c:410 ihold+0x1b/0x20 is seen in conjunction with this issue.