[Bug 1926355] Re: Snap applications segfault with new core20 (rev: 1015+)

[Balint Reczey]

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 at 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+)

Status in snap-core20:
  New
Status in glibc package in Ubuntu:
  Invalid
Status in glibc source package in Groovy:
  Invalid
Status in glibc source package in Hirsute:
  Invalid

Bug description:
  It seems that with our new core20 in the beta channel all snaps seem
  to be segfaulting. We recently had a new glibc landed in focal-updates
  - might be related.

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