Hi, This announcement covers new releases in the two actively maintained stable branches of the LTTng-UST project (2.10.7 and 2.11.1), as well as the second release candidate for the 2.12 branch (2.12.0-rc2). LTTng-UST, the Linux Trace Toolkit Next Generation Userspace Tracer, is a low-overhead application tracer. The library "liblttng-ust" enables tracing of applications and libraries. * Noteworthy fixes: All of these releases contain a fix which ensures the FD_CLOEXEC flag is set for _all_ file descriptors received by lttng-ust over unix socket. This fixes an issue where more file descriptors than expected stay open over exec. Fixes were introduced to please the address sanitizer (ASan) part of clang-9. One documented out-of-bound access was done by jhash as an "optimization" which was rightfully tripping ASan. Since this is not a fast-path, the optimization was removed and we always use the slower "valgrind-safe" code path. We also annotated the variables emitted in the __tracepoints_ptrs to ensure ASan does not emit redzones around those variables, which are means to be contiguous within the section. For the 2.10 and 2.11 branches, building with -fno-common is enforced to prepare for the upcoming default behavior change in gcc 10. Please try it out, and as usual, feedback is welcome! Thanks, Mathieu Project website: https://lttng.org Documentation: https://lttng.org/docs Download link: https://lttng.org/download -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
|