continuous ffs_blkfree_common panic

[Andrius V <vezhlys%gmail.com@localhost>]

Hi,

Today I reinstalled one of my systems (NetBSD 10) and while setting up
newly created user's password I received a panic. Since then system
always panics in the same way on boot:

[     6.252795] panic: ffs_blkfree_common: freeing free frag: dev =
0xa801, block = 186040, fs = /
[     6.252795] cpu0: Begin traceback...
[     6.252795] vpanic() at netbsd:vpanic+0x183
[     6.252795] panic() at netbsd:panic+0x3c
[     6.252795] ffs_blkfree_common.isra.0() at
netbsd:ffs_blkfree_common.isra.0+0x951
[     6.252795] ffs_blkfree_cg() at netbsd:ffs_blkfree_cg+0x106
[     6.252795] ffs_realloccg() at netbsd:ffs_realloccg+0x899
[     6.262794] ffs_balloc() at netbsd:ffs_balloc+0x1290
[     6.262794] ufs_gop_alloc() at netbsd:ufs_gop_alloc+0xa7
[     6.262794] ufs_balloc_range() at netbsd:ufs_balloc_range+0x154
[     6.262794] ffs_write() at netbsd:ffs_write+0x34e
[     6.262794] VOP_WRITE() at netbsd:VOP_WRITE+0xa6
[     6.262794] vn_write() at netbsd:vn_write+0x10e
[     6.262794] dofilewrite() at netbsd:dofilewrite+0x80
[     6.262794] sys_write() at netbsd:sys_write+0x49
[     6.272794] syscall() at netbsd:syscall+0x1fc
[     6.272794] --- syscall (number 4) ---
[     6.272794] netbsd:syscall+0x1fc:
[     6.272794] cpu0: End traceback...

The disk is Kingston KC400 SSD, there's more than enough space on it.
There are three gpt partitions (root/home/swap). root and home uses
ffs2ea and wapbl enabled (log). The actual boot happens from USB drive
but later altroot is used to switch to SSD.

[     3.402785] wd0 at atabus0 drive 0
[     3.402785] wd0: <KINGSTON SKC400S37512G>
[     3.402785] wd0: drive supports 16-sector PIO transfers, LBA48 addressing
[     3.402785] wd0: 476 GB, 992277 cyl, 16 head, 63 sec, 512
bytes/sect x 1000215216 sectors
[     3.402785] wd0: GPT GUID: d220d34c-d8d6-44a9-8a2a-09818d238115
[     3.402785] dk8 at wd0: "8baeac2c-5905-4005-a876-f61c560390f8",
262144 blocks at 2048, type: msdos
[     3.402785] dk9 at wd0: "nasroot", 724992000 blocks at 264192, type: ffs
[     3.402785] dk10 at wd0: "nashome", 242522112 blocks at 725258240, type: ffs

Mounting partitions from another NetBSD system doesn't cause panic and
I can see files.

Did I hit some hardware issue or is it software bug? What could be an
option to go forward to restore the system (reinstall, relocate files,
etc?)?

Regards,
Andrius V