Package: bird Version: 1.3.7-1 Severity: important Tags: patch Hello,
Installing bird 1.3.7-1 (wheezy aka stable) on a DockStar (CPU ARM5TE, Debian architecture armel) led to a hang: The bird process ran into an endless loop, eating 100% CPU. Before detaching, so bird.postinst was stuck. This exists in wheezy (1.3.7-1) only, squeeze, wheezy-backports and jessie are fine. Reverse-bisecting led to efd6d12b975441c7e1875a59dd9e0f3db7e958cb is the first bad commit commit efd6d12b975441c7e1875a59dd9e0f3db7e958cb Author: Ondrej Zajicek <[email protected]> Date: Wed Apr 17 15:09:50 2013 +0200 Adds two new default GCC options. Adds two new default GCC options related to optimizations (-fno-strict-aliasing and -fno-strict-overflow). This should fix some hyperaggressive GCC optimizations. Also updates autoconf option detection. but simply adding that one to the patch queue does not alter the compile options actually used, therefore a bird executable from a newly built Debian package still shows the problem. The patch below adds a memory barrier to the place where the optimizer goes wild, and solves the issue. This was found by coincidence when using debug print statements. This code path is rarely used so the performance penalty should be impossible to notice. Let me know if you're interested in fixing this via a point release, I'll do more tests then. For the time being and/or for other people affected by this: Patch your package and give feedback, or use the wheezy-backports version of bird. Christoph --- a/nest/iface.c +++ b/nest/iface.c @@ -478,6 +478,7 @@ { a->flags |= IA_PRIMARY; rem_node(&a->n); + asm volatile("": : :"memory"); add_head(&i->addrs, &a->n); } -- System Information: Debian Release: 7.4 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: armel (armv5tel) Kernel: Linux 3.10.33 Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) Shell: /bin/sh linked to /bin/dash Versions of packages bird depends on: ii libc6 2.13-38+deb7u1 ii libncurses5 5.9-10 ii libreadline6 6.2+dfsg-0.1+~jj1 ii libtinfo5 5.9-10 Versions of packages bird recommends: pn bird6 <none> bird suggests no packages. -- no debconf information
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