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
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https://bugs.launchpad.net/bugs/1926355
Title:
Snap applications segfault with new core20 (rev: 1015+)
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