OK, I've tested it in clean multipass VMs and test-snapd-rsync- core20.rsync does not work on Bionic, Focal and later. Interestingly it ships a local copy of libc6 inside that could be the problem and it worked on Focal for some time due to accidentally matching the host's libc6.
... Reading target:/usr/lib/debug/snap/test-snapd-rsync-core20/11/lib/x86_64-linux-gnu//libc-2.31.so from remote target... Program received signal SIGSEGV, Segmentation fault. 0x000055eb84b7b2d4 in time@plt () (gdb) info sharedlibrary >From To Syms Read Shared Object Library 0x00007f070255d100 0x00007f070257f7c4 Yes (*) target:/lib64/ld-linux-x86-64.so.2 No linux-vdso.so.1 0x00007f07025514f0 0x00007f07025557e8 Yes (*) target:/snap/test-snapd-rsync-core20/11/usr/lib/x86_64-linux-gnu/libacl.so.1 0x00007f0702543720 0x00007f070254a92d Yes (*) target:/snap/test-snapd-rsync-core20/11/usr/lib/x86_64-linux-gnu/libpopt.so.0 0x00007f0702374630 0x00007f07024e908f Yes (*) target:/snap/test-snapd-rsync-core20/11/lib/x86_64-linux-gnu/libc.so.6 (*): Shared library is missing debugging information. For the record test-snapd-rsync-core18.rsync does not ship and internal libc copy and does work on all releases I tried (Bionic, Focal). ** Changed in: glibc (Ubuntu) Status: New => Invalid ** Changed in: glibc (Ubuntu Groovy) Status: New => Invalid ** Changed in: glibc (Ubuntu Hirsute) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1926355 Title: Snap applications segfault with new core20 (rev: 1015+) To manage notifications about this bug go to: https://bugs.launchpad.net/snap-core20/+bug/1926355/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs