Package: ftp.debian.org Severity: normal Greetings, I spent some time on mapsembler2 to put it into adequate shape, so that it might make it to Testing. This involved some investigatons of autopkgtest regressions on 32 bits architectures, at least armhf and i386, as reported by testing excuses migrations[0]. [0] https://tracker.debian.org/pkg/mapsembler2 The initial segmentation fault encountered by the test allowed me to locate a missing check of memory allocation, and change some default program parameters to values more suitable for 32 bits architectures, when running on such arch[1]. [1] https://salsa.debian.org/med-team/mapsembler2/-/commit/73d9dae0c0c876a415ba804e83602bb984a20ac0 I then had to track a second segmentation fault down to a highly optimized hashing function, which looks compatible with all combinations of 32, 64 bits, little and big endian. However one of the steps of this hashing function is triggering the fault, and I'm not comfortable enough with the program to identify whether it is the value of the hash key which is at fault, or the logic of the hashing function in itself. Looking at the change log[2] of the program, I even think my change could have undone a fix for that crash, or even for another crash: > mapsembler2_2.2.4: fixes k-mer counting problems. Use by default 4GB memory [2] https://colibread.inria.fr/software/mapsembler2/ There is always the possibility that a simple knob has changed at some point, such as an architecture specific code path, but if so, I failed to identify it. Bringing the issue to upstream is not an option here unfortunately, as the program is not maintained since 2014[2]. Due to the above reasons, I think mapsembler2 is probably not suitable for 32 bits variants of Debian unfortunately. Kind Regards, -- Étienne Mollier <etienne.mollier@mailoo.org> Old rsa/3072: 5ab1 4edf 63bb ccff 8b54 2fa9 59da 56fe fff3 882d New rsa/4096: 8f91 b227 c7d6 f2b1 948c 8236 793c f67e 8f0d 11da Sent from /dev/pts/6, please excuse my verbosity.
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