- Document vmcore.last and describe it as the way to find the most recent
dump rather than the highest numbered dump.
- Document crashinfo and that it automatically runs to generate a
core.txt.N file if core dumps are enabled in rc.conf.
- Add a section on testing kernel dumps via the debug.kdb.panic sysctl.
Remove a later note about debug.kdb.panic from the DDB section.
- Remove any mention of gdb -k (for pre 5-3 kernels) and just talk about
kgdb.
- Remove paragraph that talks about trying to find the kernel.debug file.
Instead, recommand 'kgdb -n <N>' which does this lookup automatically,
and specifically recommend 'kgb -n last' to open the most recent
crash dump. Mention the fallback of specifying the kernel and
vmcore directly if needed.
- Remove example dump from FreeBSD 2. It is generally no longer relevant.
It used gdb -k which uses a different stack trace format as well as
including a 'frame' command that doesn't existing kgdb. (kgdb instead
lets you switch to different threads and processes).
- Remove mention of old boot blocks that don't load debug symbols. I think
this was last relevant in FreeBSD 2.x or 3.x.
- Rework the description of 'boot -d' to assume the boot menu and explicitly
mention 'boot -d' at the loader prompt.
- Document how to get stack traces of other threads in DDB.
- Fix a few references to gdb to reference kgdb instead.
- Replace 'call cpu_reset' with 'reset' for DDB.
Differential Revision: https://reviews.freebsd.org/D14711
These two links just go to ads pages. For the "evil tuning guide" I was
able to find find some pages with a similar title but they are
years old and don't give current advice. For "ZFS Best Practices Guide"
there are many variants and none seemed particularly worthwhile to link.
Reported by: Jakob Rönnbäck <jakob.ronnback@me.com>
The previous instructions did not explaina all of the steps, and lacked
information to explain to the user which numbers and device names they
might need to change for their circumstances
Reported by: Myke Geiger
Reviewed by: bcr
Sponsored by: ScaleEngine Inc.
Differential Revision: https://reviews.freebsd.org/D14502
* 1101509: backport of the LinuxKPI from FreeBSD-head
* 1101510: cmpxchg() macro is now fully functional in the LinuxKPI
* 1101511: concluding the recent LinuxKPI related updates
* 1101512: merging retpoline support from the upstream llvm, clang and
lld 5.0 branches
* 1101513: merging clang, llvm, lld, lldb, compiler-rt and libc++ 6.0.0
release, and several follow-up fixes
