Help diagnosing panic: pr_phinpage_check

[joelp%sdf.org@localhost]

Every few days I'm getting a kernel panic on a RockPro64, 4GB; drive info:
ld0 at sdmmc0: 64gb eMMC as /
ld4 at nvme0 nsid 1: 500 gb NVMe M.2 2280

Kernel: GENERIC64 9.3 #0

It seemed to start happening after I increased disk i/o on the M.2 storage
on ld4. Can you help me diagnose?

Mar 19 11:52:30 rock64 /netbsd: [ 422844.5765256] panic:
pr_phinpage_check: [bufpl] item 0xffff00007f719d80 not part of pool
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5765256] cpu3: Begin traceback...
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5765256] trace fp ffffffc062457820
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5865282] fp ffffffc062457840
vpanic() at ffffffc00042b4d0 netbsd:vpanic+0x198
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5865282] fp ffffffc0624578a0
panic() at ffffffc00042b5a0 netbsd:panic+0x48
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5865282] fp ffffffc062457930
pool_cache_put_paddr() at ffffffc000429410
netbsd:pool_cache_put_paddr+0x128
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5865282] fp ffffffc062457960
buf_trim() at ffffffc00046498c netbsd:buf_trim+0x5c
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5965294] fp ffffffc062457990
allocbuf() at ffffffc000464e0c netbsd:allocbuf+0x1fc
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5965294] fp ffffffc062457a00
getblk() at ffffffc00046536c netbsd:getblk+0x164
Mar 19 11:52:30 rock64 /netbsd: [ 422844.5965294] fp ffffffc062457a50
ffs_getblk() at ffffffc0003a6fd4 netbsd:ffs_getblk+0x2c
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6065305] fp ffffffc062457a80
ffs_balloc() at ffffffc0003a05b4 netbsd:ffs_balloc+0x11e4
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6065305] fp ffffffc062457bf0
ufs_gop_alloc() at ffffffc0003b3bc4 netbsd:ufs_gop_alloc+0xb4
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6065305] fp ffffffc062457c60
ffs_write() at ffffffc0003ab214 netbsd:ffs_write+0x374
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6065305] fp ffffffc062457d00
VOP_WRITE() at ffffffc000481268 netbsd:VOP_WRITE+0x40
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6165320] fp ffffffc062457d50
vn_write() at ffffffc00047b3d0 netbsd:vn_write+0x110
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6165320] fp ffffffc062457da0
dofilewrite() at ffffffc0004350f0 netbsd:dofilewrite+0x78
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6165320] fp ffffffc062457e20
syscall() at ffffffc000074a34 netbsd:syscall+0x19c
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329] tf ffffffc062457ed0
el0_trap() at ffffffc000073148 netbsd:el0_trap
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329] ---- trapframe
0xffffffc062457ed0 (304 bytes) ----
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329]     pc=0000f9d1374685a8,
  spsr=0000000040000000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329]    esr=0000000056000004,
   far=ffffffc061253000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329]     x0=0000000000000016,
    x1=0000f9d12f9de3e0
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6265329]     x2=0000000000010000,
    x3=0000000000000000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]     x4=0000f9d137c95d68,
    x5=0000000000000000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]     x6=0000ffffffa905d8,
    x7=0000000000000000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]     x8=0000f9d1373305c8,
    x9=0000f9d1373305b0
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x10=0000000000000001,
   x11=0000000000010000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x12=0000f9d12f9de3e0,
   x13=0000000000000000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x14=00000000ffffffff,
   x15=0000f9d137c9d1d5
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x16=0000f9d1378b3908,
   x17=0000f9d1374685a4
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x18=000000000000001a,
   x19=0000f9d1378b3000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x20=0000f9d1378fd800,
   x21=0000f9d1373eb000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x22=0000000000010000,
   x23=0000f9d12f9de3e0
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6365361]    x24=0000000000000016,
   x25=0000f9d137c61000
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381]    x26=0000000000010000,
   x27=0000f9d130033ce0
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381]    x28=0000000000000001,
fp=x29=0000ffffffa90540
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381] lr=x30=0000f9d137898d58,
    sp=0000ffffffa90540
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381]
------------------------------------------------
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381] cpu3: End traceback...
Mar 19 11:52:30 rock64 /netbsd:
Mar 19 11:52:30 rock64 /netbsd: [ 422844.6465381] dump to dev 92,33 not
possible
Mar 19 11:52:30 rock64 /netbsd: [ 422844.7165395] rebooting...