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Message-ID: <1271432722.2564.16.camel@localhost.localdomain> Date: Fri, 16 Apr 2010 23:45:22 +0800 From: r6144 <rainy6144@...il.com> To: linux-kernel@...r.kernel.org Subject: Process-shared futexes on hugepages puts the kernel in an infinite loop in 2.6.32.11; is this fixed now? Hello all, I'm having an annoying kernel bug regarding huge pages in Fedora 12: https://bugzilla.redhat.com/show_bug.cgi?id=552257 Basically I want to use huge pages in a multithreaded number crunching program, which happens to use process-shared semaphores (because fftw does it). The futex for the semaphore ends up lying on a huge page, and I then get an endless loop in get_futex_key(), apparently because the anonymous huge page containing the futex does not have a page->mapping. A test case is provided in the above link. I reported the bug to Fedora bugzilla months ago, but haven't received any feedback yet. The Fedora kernel is based on 2.6.32.11, and a cursory glance at the 2.6.34-rc3 source does not yield any relevant change. So, could anyone tell me if the current mainline kernel might act better in this respect, before I get around to compiling it? Thank you very much. Please CC me as I'm not subscribed. r6144 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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