svn commit: r332959 - head/sys/kern

[John Baldwin]

On Tuesday, April 24, 2018 06:54:20 PM Conrad Meyer wrote:
> Author: cem
> Date: Tue Apr 24 18:54:20 2018
> New Revision: 332959
> URL: https://svnweb.freebsd.org/changeset/base/332959
> 
> Log:
>   panic: Optionally, trace secondary panics
>   
>   To diagnose and fix secondary panics, it is useful to have a stack trace.
>   When panic tracing is enabled, optionally trace secondary panics as well.
>   
>   The option is configured with the tunable/sysctl debug.trace_all_panics.
>   
>   (The original concern that inspired only tracing the primary panic was
>   likely that the secondary trace may scroll the original panic message or trace
>   off the screen.  This is less of a concern for serial consoles with logging.
>   Not everything has a serial console, though, so the behavior is optional.)

Note that KDB_TRACE is enabled by default, so you would need it to always
default to false to preserve existing behavior by default.

-- 
John Baldwin