John Baldwin <j...@freebsd.org> wrote: > On 3/10/22 8:14 AM, Mateusz Guzik wrote: > > On 3/10/22, Bjoern A. Zeeb <bzeeb-li...@lists.zabbadoz.net> wrote: > >> Hi, > >> > >> I am having a weird issue with ktrace on an nfsroot machine: > >> > >> root:/tmp # ktrace sleep 1 > >> root:/tmp # kdump > >> -559038242 Events dropped. > >> kdump: bogus length 0xdeadc0de > >> > >> Anyone seen something like this before? > >> > > > > I just did a quick check and it definitely fails on nfs mounts: > > # ktrace pwd > > /root/mjg > > # kdump > > -559038242 Events dropped. > > kdump: bogus length 0xdeadc0de > > > > I don't have time to look into it this week though. > > Possibly related: core dumps are no longer working for me on NFS > mounts. I get a 0 byte foo.core instead of a valid core dump. I just tried a core dump for a kernel built from main sources as of to-day and it worked ok.
However my userland is several months old and I can't easily upgrade it for now. There was a recent ZFS problem that found its way into 13.0-p8 that I'm pretty sure is fixed now. If you had a fairly recent server exporting ZFS, that *might* explain it? In particular, an NFSroot uses NFSv3 and nothing has changed for NFSv3 in a looonnggg time. rick -- John Baldwin
