Re: NetBSD 10.1_STABLE crash

[Robert Elz <kre%munnari.OZ.AU@localhost>]

    Date:        Wed, 28 May 2025 10:44:03 +0200 (CEST)
    From:        6bone%6bone.informatik.uni-leipzig.de@localhost
    Message-ID:  <44be64a4-0839-3857-8e30-60155b67a19b%6bone.informatik.uni-leipzig.de@localhost>

  | The problem recurs at irregular intervals. I can only observe the problem 
  | on the server that uses a large iSCSI drive. The server is the iSCSI 
  | initiator. Therefore, I suspect it's an iSCSI problem.

The underlying problem might be, but the one you gave the stack trace
for wasn't.

Either some earlier crash might have caused the problem, or there is
some corruption, either being caused by an iSCSI problemm or which
is there, and isn't being fixed by your fsck.

Note that the problem being reported there is not necessarily the one
you're repairing with your fsck - a crash like that (any crash) will
often leave file system damage that needs to be repaired, on any
filesystem at all - you might just be repairing damage caused by the
recent crash, and ignoring the underlying cause.

Unless something is corrupting the iSCSI transfers in an unusual way
(dup allocated inodes wouldn't be the usual thing I'd expect from the
kind of issue that would typically cause) then I suspect the real problem
may be elsewhere.

Run fsck -f (the -f is important) on *all* of your filesystems, local and
remote, starting with the one identified in the panic message, if you
have that data.   But in any case, on all of them.

And yes, I know how tiresome that can be, I have filesystems which can
take more than an hour to fsck, and I'm currently making even bigger
ones.   Fortunately, if you have sufficient RAM to avoid slowing things
down even more by paging, you can run fscks in parallel on different
drives (I wouldn't run two on the same drive (sets) at the same time,
that would just cause head contention - and I know heads would be
involved, ie: not SSDs, as SSDs aren't (yet) going to build a big enough
filesystemm compared to their access speed, for this to really matter).

kre