IBM Power S822LC: Linux 6.1.172 fails with `kernel BUG at mm/huge_memory.c:474!`, `Oops: Exception in kernel mode, sig: 5 [#1]`

$ ipmitool -I lanplus -H bmc-power8 -U ADMIN sol activate
[SOL Session operational.  Use ~? for help]
[  234.043322] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
[  234.044085] sd 0:0:0:0: [sda] Synchronizing SCSI cache
[  234.108802] xhci_hcd 0021:0d:00.0: Host halt failed, -110
[  234.109940] kexec_core: Starting new kernel
[  234.123024] kexec: waiting for cpu 24 (physical 40) to enter 1 state
[  234.12329[  291.048719231,5] OPAL: Switch to big-endian OS
2] kexec: waiting for cpu 1 (physical 17) to enter 2 state
[[  299.043412967,5] OPAL: Switch to little-endian OS
   234.123376] kexec: waiting for cpu 3 (physical 19) to enter 2 state
[  234.123408] kexec: waiting for cpu 8 (physical 24) to enter 2 state
[  234.123560] kexec: waiting for cpu 3 (physical 19) to enter OPAL
[  234.124611] kexec: waiting for cpu 6 (physical 22) to enter OPAL
[  234.125644] kexec: waiting for cpu 8 (physical 24) to enter OPAL
[  235.721365] kexec: Starting switchover sequence.
[    1.667254] kernel BUG at mm/huge_memory.c:474!
[    1.667370] Oops: Exception in kernel mode, sig: 5 [#1]
[    1.667419] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
[    1.667434] Modules linked in:
[    1.667446] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.1.172 #9
[    1.667491] Hardware name: 8335-GCA POWER8 (raw) 0x4d0200 
opal:skiboot-5.4.8-5787ad3 PowerNV
[    1.667596] NIP:  c000000002044ccc LR: c000000002044ca8 CTR: 
c000000002044c3c
[    1.667613] REGS: c00000800d71b850 TRAP: 0700   Not tainted  (6.1.172)
[    1.667628] MSR:  9000000000029033 <SF,HV,EE,ME,IR,DR,RI,LE>  CR: 
48008228  XER: 00000000
[    1.667653] CFAR: c000000000090944 IRQMASK: 0
[    1.667653] GPR00: c0000000000115d8 c00000800d71baf0 c000000001568100 
0000000000000001
[    1.667653] GPR04: 0000000000000000 0000000000000000 0000000000000024 
0000000000000000
[    1.667653] GPR08: 0000000000000018 0000000000000008 0000000000000001 
c00000800d71ba70
[    1.667653] GPR12: c000000002044c3c c000000002d10000 c000000000011b18 
0000000000000000
[    1.667653] GPR16: 0000000000000000 0000000000000000 0000000000000000 
c000000002430490
[    1.667653] GPR20: c000000002430470 c000000002430450 c000000002430430 
c000000002003628
[    1.667653] GPR24: c000000002091078 c000000001546ed0 c000000002091050 
0000000000000000
[    1.667653] GPR28: 0000000000000005 c000000019600380 0000000000000000 
c000000002044c3c
[    1.667792] NIP [c000000002044ccc] hugepage_init+0x90/0x270
[    1.667809] LR [c000000002044ca8] hugepage_init+0x6c/0x270
[    1.667823] Call Trace:
[    1.667830] [c00000800d71baf0] [c0000000010e9f90] 
_raw_spin_unlock_irqrestore+0x50/0xb0 (unreliable)
[    1.667853] [c00000800d71bb80] [c0000000000115d8] 
do_one_initcall+0x78/0x2c8
[    1.667871] [c00000800d71bc60] [c000000002004ce8] 
do_initcalls+0x1dc/0x248
[    1.667889] [c00000800d71bd40] [c000000002004ffc] 
kernel_init_freeable+0x214/0x288
[    1.667909] [c00000800d71bda0] [c000000000011b3c] kernel_init+0x2c/0x1d0
[    1.667925] [c00000800d71be10] [c00000000000d05c] 
ret_from_kernel_thread+0x5c/0x64
[    1.667943] Instruction dump:
[    1.667953] f92aaad8 480001e0 4a04bc45 60000000 2c030000 4182ffe0 
3d220117 39295a08
[    1.667976] e9290000 21490007 7d4a5110 7d4a00d0 <0b0a0000> 21290001 
7d294910 39290001
[    1.667999] ---[ end trace 0000000000000000 ]---
[    1.847226]
[    2.847265] note: swapper/0[1] exited with irqs disabled
[    2.847324] Kernel panic - not syncing: Attempted to kill init! 
exitcode=0x00000005
[    3.1[  315.177993778,5] OPAL: Reboot request...