I tried to debug locally compiled snap with debug symbols enabled, and it failed:
ofry@ofry-virtual-machine:~$ snap run --gdb telegram-desktop
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Reading symbols from /snap/snapd/24792/usr/lib/snapd/snap-confine...
(No debugging symbols found in /snap/snapd/24792/usr/lib/snapd/snap-confine)
Starting program: /snap/snapd/24792/usr/lib/snapd/snap-confine --base core24 snap.telegram-desktop.telegram-desktop /usr/lib/snapd/snap-exec --command=gdb telegram-desktop.telegram-desktop
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/snap/snapd/current/usr/lib/x86_64-linux-gnu/libthread_db.so.1".
[Detaching after fork from child process 233023]
[Detaching after fork from child process 233024]
cannot create user data directory: /home/ofry/snap/telegram-desktop/x1: Permission denied
[Inferior 1 (process 233017) exited with code 01]
Catchpoint 1 (exec)
The program is not being run.
(gdb) exit
Journalctl entries:
июл 25 17:40:25 ofry-virtual-machine sudo[232593]: pam_unix(sudo:session): session closed for user root
июл 25 17:40:27 ofry-virtual-machine systemd[4321]: Started snap.telegram-desktop.telegram-desktop-e0ab683b-0312-4776-a673-b831451e46e3.scope.
июл 25 17:40:27 ofry-virtual-machine sudo[232687]: ofry : TTY=pts/1 ; PWD=/home/ofry ; USER=root ; COMMAND=/usr/bin/gdb -ex=run '-ex=catch exec' -ex=continue --args /snap/snapd/24792/usr/lib/snapd/snap-confine --base core24 snap.telegram-desktop.telegram-desktop /usr/lib/snapd/snap-exec --command=gdb telegram-desktop.telegram-desktop
июл 25 17:40:27 ofry-virtual-machine sudo[232687]: pam_unix(sudo:session): session opened for user root(uid=0) by ofry(uid=1000)
июл 25 17:40:34 ofry-virtual-machine sudo[232687]: pam_unix(sudo:session): session closed for user root
июл 25 17:41:26 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:41:26 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:41:26 ofry-virtual-machine kernel: audit: type=1400 audit(1753454486.157:1864): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name="/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/snap.firefox.firefox-43fc9730-c0b1-40dc-b588-f1249627866e.scope/cpu.max" pid=232746 comm=57656220436F6E74656E74 requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
июл 25 17:42:29 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:42:29 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:42:29 ofry-virtual-machine kernel: audit: type=1400 audit(1753454549.445:1865): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name="/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/snap.firefox.firefox-43fc9730-c0b1-40dc-b588-f1249627866e.scope/cpu.max" pid=232813 comm=57656220436F6E74656E74 requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
июл 25 17:42:40 ofry-virtual-machine systemd[4321]: Started snap.telegram-desktop.telegram-desktop-06864792-6ae2-45cd-8ca1-f965b49854a3.scope.
июл 25 17:42:41 ofry-virtual-machine sudo[232871]: ofry : TTY=pts/1 ; PWD=/home/ofry ; USER=root ; COMMAND=/usr/bin/gdb -ex=run '-ex=catch exec' -ex=continue --args /snap/snapd/24792/usr/lib/snapd/snap-confine --base core24 snap.telegram-desktop.telegram-desktop /usr/lib/snapd/snap-exec --command=gdb telegram-desktop.telegram-desktop
июл 25 17:42:41 ofry-virtual-machine sudo[232871]: pam_unix(sudo:session): session opened for user root(uid=0) by ofry(uid=1000)
июл 25 17:42:44 ofry-virtual-machine sudo[232871]: pam_unix(sudo:session): session closed for user root
июл 25 17:43:18 ofry-virtual-machine NetworkManager[2652]: <info> [1753454598.7188] dhcp4 (ens33): state changed new lease, address=192.168.59.128
июл 25 17:43:18 ofry-virtual-machine dbus-daemon[2441]: [system] Activating via systemd: service name='org.freedesktop.nm_dispatcher' unit='dbus-org.freedesktop.nm-dispatcher.service' requested by ':1.14' (uid=0 pid=2652 comm="/usr/sbin/NetworkManager --no-daemon" label="unconfined")
июл 25 17:43:18 ofry-virtual-machine systemd[1]: Starting NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service...
июл 25 17:43:18 ofry-virtual-machine dbus-daemon[2441]: [system] Successfully activated service 'org.freedesktop.nm_dispatcher'
июл 25 17:43:18 ofry-virtual-machine systemd[1]: Started NetworkManager-dispatcher.service - Network Manager Script Dispatcher Service.
июл 25 17:43:28 ofry-virtual-machine systemd[1]: NetworkManager-dispatcher.service: Deactivated successfully.
июл 25 17:43:38 ofry-virtual-machine sudo[232513]: pam_unix(sudo:session): session closed for user root
июл 25 17:43:38 ofry-virtual-machine systemd[1]: snap.snappy-debug.snappy-debug-1251d717-c957-4b5f-aaec-2e2b48100d76.scope: Deactivated successfully.
июл 25 17:43:38 ofry-virtual-machine sudo[232514]: pam_unix(sudo:session): session closed for user root
июл 25 17:43:46 ofry-virtual-machine systemd[4321]: Started snap.telegram-desktop.telegram-desktop-30547bda-aa9a-48bb-9e69-8fc7d44484f3.scope.
июл 25 17:43:47 ofry-virtual-machine sudo[232987]: ofry : TTY=pts/1 ; PWD=/home/ofry ; USER=root ; COMMAND=/usr/bin/gdb -ex=run '-ex=catch exec' -ex=continue --args /snap/snapd/24792/usr/lib/snapd/snap-confine --base core24 snap.telegram-desktop.telegram-desktop /usr/lib/snapd/snap-exec --command=gdb telegram-desktop.telegram-desktop
июл 25 17:43:47 ofry-virtual-machine sudo[232987]: pam_unix(sudo:session): session opened for user root(uid=0) by ofry(uid=1000)
июл 25 17:43:50 ofry-virtual-machine sudo[232987]: pam_unix(sudo:session): session closed for user root
июл 25 17:43:50 ofry-virtual-machine systemd[4321]: snap.telegram-desktop.telegram-desktop-30547bda-aa9a-48bb-9e69-8fc7d44484f3.scope: Consumed 1.077s CPU time, 65.4M memory peak.
июл 25 17:44:01 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:44:01 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:44:01 ofry-virtual-machine kernel: audit: type=1400 audit(1753454641.810:1866): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name="/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/snap.firefox.firefox-43fc9730-c0b1-40dc-b588-f1249627866e.scope/cpu.max" pid=233040 comm=57656220436F6E74656E74 requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
июл 25 17:45:02 ofry-virtual-machine CRON[233101]: pam_unix(cron:session): session opened for user root(uid=0) by root(uid=0)
июл 25 17:45:02 ofry-virtual-machine CRON[233117]: (root) CMD (command -v debian-sa1 > /dev/null && debian-sa1 1 1)
июл 25 17:45:02 ofry-virtual-machine CRON[233101]: pam_unix(cron:session): session closed for user root
июл 25 17:46:24 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:46:24 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:46:24 ofry-virtual-machine kernel: audit: type=1400 audit(1753454784.464:1867): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name="/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/snap.firefox.firefox-43fc9730-c0b1-40dc-b588-f1249627866e.scope/cpu.max" pid=233272 comm=57656220436F6E74656E74 requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
июл 25 17:46:28 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:46:28 ofry-virtual-machine rtkit-daemon[4187]: Supervising 9 threads of 6 processes of 1 users.
июл 25 17:46:28 ofry-virtual-machine kernel: audit: type=1400 audit(1753454788.387:1868): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name="/sys/fs/cgroup/user.slice/user-1000.slice/user@1000.service/app.slice/snap.firefox.firefox-43fc9730-c0b1-40dc-b588-f1249627866e.scope/cpu.max" pid=233325 comm=57656220436F6E74656E74 requested_mask="r" denied_mask="r" fsuid=1000 ouid=1000
июл 25 17:46:38 ofry-virtual-machine systemd[4321]: Started snap.telegram-desktop.telegram-desktop-061ab84b-2848-43b4-b50e-73cd23bbb0a7.scope.
июл 25 17:46:38 ofry-virtual-machine sudo[233417]: ofry : TTY=pts/1 ; PWD=/home/ofry ; USER=root ; COMMAND=/usr/bin/gdb -ex=run '-ex=catch exec' -ex=continue --args /snap/snapd/24792/usr/lib/snapd/snap-confine --base core24 snap.telegram-desktop.telegram-desktop /usr/lib/snapd/snap-exec --command=gdb telegram-desktop.telegram-desktop
июл 25 17:46:38 ofry-virtual-machine sudo[233417]: pam_unix(sudo:session): session opened for user root(uid=0) by ofry(uid=1000)
июл 25 17:46:41 ofry-virtual-machine sudo[233417]: pam_unix(sudo:session): session closed for user root
I haven’t got such error when run any snap “as usual”:
telegram-desktop or snap run --shell telegram-desktop
My OS is KUbuntu 25.04
