Run CI tests with AddressSanitizer

[ahrens]

Describe the feature would like to see added to OpenZFS

OpenZFS supports building the userland components (including libzpool, ztest, zdb) with AddressSanitizer support, by running ./configure --enable-asan. It would be great if the automated tests ran zloop with this flag. It might even make sense for debug builds to always use asan.

How will this feature improve OpenZFS?

Helps us find bugs sooner, pre-integration. e.g. #12215, #10193, #9706, #12339

Additional context

[dioni21]

I always try to build binaries with ASAN in my personal setup, and can say that there are lots of bugs it finds. I try to MR some.

I had trouble sometime ago when udev did not add zvol devices. Found that the problem was ASAN binaries dying during udev setup. To fix, I had to add locally to my /usr/lib/udev/zvol_id:

export ASAN_OPTIONS=halt_on_error=false:poison_heap=false:detect_leaks=false:leak_check_at_exit=false:alloc_dealloc_mismatch=false
export LSAN_OPTIONS=detect_leaks=false:leak_check_at_exit=false

Similarly, I had trouble in systemd scripts for using ASAN binaries.

[szubersk]

@ahrens I think we can close this issue as the desired functionality was implemented in #12928

[behlendorf]

Right, thanks!