Source: linux Severity: important Tags: upstream Dear Maintainer,
The kernel has a register corruption bug on sparc that is causing corruption and failed builds. Enabling SLUB instead of SLAB in the kernel is an effective workaround. James Y Knight observed it here https://lists.debian.org/debian-sparc/2015/06/msg00005.html and he includes the source for a test case. It is also causing failed builds such as this https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=789013 This problem has been around for a long time. I haven't been able to find a good version to bisect from. During the course of my testing I discovered an effective workaround, enabling SLUB as the kernel allocator instead of SLAB seems to prevent the error from occurring. With SLAB enabled Knight's test program produces an error within seconds. With SLUB enabled Knight's test program ran for more than 10 hours without producing an error. SLUB also fixes the nettle build. Because this workaround seems to be very effective and should have a very low impact on users I request that you enable SLUB on sparc kernels while the cause of the problem is investigated. I'll add a patch once I figure out the Debian kernel config generation. But it seems like it would look something like: ## ## file: init/Kconfig ## # CONFIG_SLAB is not set CONFIG_SLUB=y added to debian/config/kernelarch-sparc/config . Thanks, David -- System Information: Debian Release: stretch/sid APT prefers unstable APT policy: (500, 'unstable') Architecture: sparc (sparc64) Foreign Architectures: sparc64 Kernel: Linux 4.1.0-rc7.201506100842+ (SMP w/1 CPU core) Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
