Public bug reported:
cups-browsed 2.0.0 segfaults on Ubuntu Noble - package not rebuilt
against libcups2t64 2.4.7
Package: cups-browsed
Version: 2.0.0-0ubuntu10.3
Architecture: amd64
Distribution: Ubuntu Noble 24.04
== Summary ==
cups-browsed 2.0.0 crashes repeatedly with SIGSEGV on Ubuntu Noble.
The package declares a dependency on libcups2t64 >= 2.0.2 but the
currently installed version is 2.4.7, which introduced API/ABI changes
that cups-browsed 2.0.0 was not built or tested against. cups-browsed
needs to be rebuilt against the current libcups2t64 2.4.7 as shipped
in noble-updates.
== Environment ==
cups-browsed: 2.0.0-0ubuntu10.3
libcups2t64: 2.4.7-1.2ubuntu7.9
Ubuntu: 24.04 Noble
Kernel: (insert: uname -r)
== Observed Behavior ==
cups-browsed crashes with SIGSEGV within seconds to minutes of startup.
systemd restarts the service automatically, which crashes again, creating
a permanent crash loop. The crash occurs consistently at the same offset
in libcups.so.2:
cups-browsed[PID]: segfault at 192 ip 0x...3439 sp 0x... error 6
in libcups.so.2[...+5e000]
"error 6" indicates a write to an invalid address, consistent with a
NULL pointer dereference or use-after-free introduced by ABI changes
in libcups2t64 between 2.0.x and 2.4.x.
== Root Cause ==
cups-browsed 2.0.0 was built against libcups2t64 2.0.x and declares:
Depends: libcups2t64 (>= 2.0.2)
libcups2t64 was updated to 2.4.7 in noble-updates/noble-security, but
cups-browsed was not rebuilt against it. The version constraint allows
the installation of the mismatched combination without warning, but the
resulting binary is unstable.
== Expected Behavior ==
cups-browsed should be rebuilt against libcups2t64 2.4.7 as part of
the noble-updates cycle, ensuring ABI compatibility. Alternatively the
dependency should be tightened to reflect the actual tested version.
== Fix ==
Rebuild cups-browsed against the currently installed libcups2t64 2.4.7:
apt-get source cups-browsed
apt-get build-dep cups-browsed
cd cups-browsed-2.0.0/
dpkg-buildpackage -b -uc -us
dpkg -i ../cups-browsed_2.0.0-0ubuntu10.3_amd64.deb
== Impact ==
Any Ubuntu Noble system running cups-browsed with BrowsePoll against
a remote CUPS server is affected. cups-browsed is unusable in its
current state on noble-updates.
** Affects: cups-browsed (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2155146
Title:
cups-browsed crashes every 30min
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