Commits on Jan 28, 2022

1. Add --enable-asan and --enable-ubsan switches …

   `configure` now accepts `--enable-asan` and `--enable-ubsan` switches
   which results in passing `-fsanitize=address`
   and `-fsanitize=undefined`, respectively, to the compiler. Those
   flags are enabled in GitHub workflows for ZTS and zloop. Errors
   reported by both instrumentations are corrected, except for:
   
   - Memory leak reporting is (temporarily) suppressed. The cost of
     fixing them is relatively high compared to the gains.
   
   - Checksum computing functions in `module/zcommon/zfs_fletcher*`
     have UBSan errors suppressed. It is completely impractical
     to enforce 64-byte payload alignment there due to performance
     impact.
   
   - There's no ASan heap poisoning in `module/zstd/lib/zstd.c`. A custom
     memory allocator is used there rendering that measure
     unfeasible.
   
   - Memory leaks detection has to be suppressed for `cmd/zvol_id`.
     `zvol_id` is run by udev with the help of `ptrace(2)`. Tracing is
     incompatible with memory leaks detection.
   
   Signed-off-by: szubersk <szuberskidamian@gmail.com>

   

   szubersk committed Jan 28, 2022
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