Rob Norris b4cd10ce5b libspl/backtrace: comment and harden libunwind backtracer
This is the sort of code that we get right once and never look at again.
Anyone reading this code is already likely in the middle of a debugging
nightmare, and then they have a wall of manual string construction and
an unfamiliar and idiosyncratic library to deal with. So, comment the
whole thing to try to make it clear what's going on.

In pursuit of the above, I've added return checks to some of the
libunwind calls, fixed the frame loop to not skip the "top" frame
(however unseful it may be), and fix a couple of calls to
spl_bt_u64_to_hex_str() which requested 18 digits instead of 16.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16653
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.
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