Hi, On Thu, Nov 17, 2011 at 10:25:26AM +0100, Łukasz Michalik wrote: > Hello, > > I'm currently debugging an issue in sydbox wrt recent linux kernels. > I initially thought strace wasn't affected by it, but then debian bug > #622863 [1] made me investigate further, althought it's impossible to > say what version was that user using. It seems that unreleased code > clean up in HEAD exposes the bug, namely the 19cdada5b commit. > > The bug only happens on recent linux. I've bisected the kernel and > found that it was introduced by 9b84cca2564b9 [2] in linux.git, so > pretty much everything since 3.0-rc2 is affected.
Łukasz, thanks for letting us aware of the issue. I had a hope that Denys as the author of that cleanup series would comment it, but I haven't heard from him yet. How do you suggest to deal with this bug? Is there a chance to get it fixed in the kernel soon enough? > I'm attaching a testcase that makes strace -f fail within seconds > (compile with g++ -std=c++0x -pthread); it just fires whole bunch of > threads that fork and wait for exiting children. The test case is > perverse, but same would happen if one would try to compile say gcc > under strace with considerable number of paraller jobs for long > enough. > > [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=622863 > [2] > https://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=9b84cca2564b9a5b2d064fb44d2a55a5b44473a0 -- ldv
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