zfs.core, 'send' crashing - how to debug offline?

[Gary Jennejohn]

On Mon, 4 May 2020 23:51:47 +0200
Harry Schmalzbauer <freebsd at omnilan.de> wrote:

> Hello,
> 
> playing with -current snapshot provides all kinds of surprises :-)
> 
> The one__ regarding the topic:
> 'zfs send' aborts with "invalid argument".
> The machine in question doesn't have internet access (but local FreeBSD 
> FTP mirror, so I managed to install matching base-dbg).
> What debugger am I supposed to use these days for -current?__ Sorry for 
> that ignorant/stupid question ___ all I know about the transition to 
> llvm/clang is that it's still 'cc' ;-)
> There's still /usr/libexe/kdgb, but I can't use it for my userland core 
> dump, can I?
>

I can't address the other questions, but I'm pretty sure that the gdb
from ports is what you want.  It's a much newer version than what was
under /usr/src.

> Not beeing able to dump ZFS is a very severe problem for me and I'd like 
> to provide at least some useful problem reports.
> 
> Any help highly appreciated, thanks,
> 
> -harry
> 
> P.S. No matter if I try to send snapshots or unmounted fielsystems - 
> 'send' is always aborting (scrub doesn't detect inconsistencies).
> 
> P.P.S.: sendmail(8) is back in base!?! and DMA gone????????
> P.P.P.S.: efi\freebsd\loader.efi doesn't work well ___ raised and already 
> commented by bcran@
> P.P.P.P.S: kern.vt.fb.default_mode vs. efi_max_resolution for 
> loader.conf(8) was hard to invalidate reading vt(4) ___ still completely 
> unsure how/if to change non-KMS UEFI/GOP resolution outside loader(8).
> 

-- 
Gary Jennejohn