Package: libunwind8 Version: 1.8.1-0.2 Severity: important X-Debbugs-Cc: [email protected]
Dear Maintainer, Please see upstream bug https://github.com/libunwind/libunwind/issues/925. There is a very straightforward reproduction if you want to. Basically what appears to be the case is libunwind interposes itself with _Unwind_XYZ symbols on top of libgcc. Since debian's libunwind is built this way. But then glibc pthread cancellation facility explicitly dlsym-s libgcc's version of _Unwind_ForceUnwind and then libgcc does it's own unwind context and so on and ends up invoking libunwind's _Unwind_GetLanguageSpecificData which ends assumes libunwinds context and crashes. I don't see build failure log in #994510 but it is likely relevant. If libunwind is only used for backtraces (as it should), then there should be no setcontext invokations. -- System Information: Debian Release: forky/sid APT prefers unstable APT policy: (500, 'unstable'), (500, 'testing'), (1, 'experimental') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 6.19.6-alk (SMP w/32 CPU threads) Kernel taint flags: TAINT_USER Locale: LANG=be_BY.UTF-8, LC_CTYPE=be_BY.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) Versions of packages libunwind8 depends on: ii libc6 2.42-13 ii liblzma5 5.8.2-2 libunwind8 recommends no packages. libunwind8 suggests no packages. -- no debconf information
