Wednesday, March 31st, 2021

Time	Event
2:11p	[$] GDB and io_uring A problem reported when attaching GDB to programs that use io_uring has led to a flurry of potential solutions, and one that was merged into Linux 5.12-rc5. The problem stemmed from a change made in the 5.12 merge window to how the threads used by io_uring were created, such that they became associated with the process using io_uring. Those "I/O threads" were treated specially in the kernel, but that led to the problem with GDB (and likely other ptrace()-using programs). The solution is to treat them like other threads because it turned out that trying to make them special caused more problems than it solved. (Comment on this)
3:29p	Security updates for Wednesday Security updates have been issued by Debian (curl, ldb, leptonlib, and linux-4.19), Fedora (busybox), Gentoo (openssl, redis, salt, and sqlite), Mageia (firefox, fwupd, glib2.0, python-aiohttp, radare2, thunderbird, and zeromq), openSUSE (firefox), SUSE (ovmf, tomcat, and zabbix), and Ubuntu (curl, lxml, and pygments). (Comment on this)
10:24p	[$] HPy: a better C API for Python? The HPy project has been around for more than a year now; it is meant to provide an alternate C API for Python that allows extensions to the language to run, and run well, in more environments. It first came to our attention in a report of a talk at the 2020 Python Language Summit (LWN coverage), but it goes back to some discussions that were held at EuroPython 2019. There are a number of ways that the existing C API holds back innovation for Python, but there are also some hugely important extensions (e.g. NumPy) that use it; any change to the API needs to take those into account. (Comment on this)

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