Control: tags -1 + moreinfo unreproducible Hi Lucas!
> On Wed, Dec 09, 2020 at 09:39:08AM +0100, Lucas Nussbaum wrote: > > Source: memkind > > During a rebuild of all packages in sid, your package failed to build > > on ppc64el. At the same time, it did not fail on amd64. > > > I'm marking this bug as severity:serious since your package currently has > > ppc64el binary packages in unstable (so this is a regression). > > > [ RUN ] GetArenaTest.test_TC_MEMKIND_ThreadHash > > > test/get_arena_test.cpp:67: Failure > > > Expected: (max_collisions) <= (collisions_limit), actual: 10 vs 5 > > > [ FAILED ] GetArenaTest.test_TC_MEMKIND_ThreadHash (184 ms) Ping: > Is that fail reproducible for you? I have a possible fix, but have no way > of verifying it -- the package builds successfully on all machines I have > access to, and did build fine on buildds (no major changes to toolchain > since then). The underlying code uses an assumption on the internal working for glibc, that might possibly be invalid in some cases. Even if it happens to be wrong, correctness is not violated, there's just a performance loss. The test that fails could thus be removed -- however, I'd like to know how it did fail in the first place. No matter how I tried, I did not manage to reproduce the failure. There are also multiple ways to improve this hash (an explicit mapping, a "random" hash, etc) but as this code is used in large performance-critical parts, I'd prefer to first understand. Meow! -- ⢀⣴⠾⠻⢶⣦⠀ .--[ Makefile ] ⣾⠁⢠⠒⠀⣿⡁ # beware of races ⢿⡄⠘⠷⠚⠋⠀ all: pillage burn ⠈⠳⣄⠀⠀⠀⠀ `----
