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Message-ID: <CAP145pinoutWaVCAf1xk8X-Bc8Uu=d2DD8k3w_o=V7caNLqNLA@mail.gmail.com> Date: Mon, 7 Oct 2013 18:22:48 +0200 From: Robert Święcki <robert@...ecki.net> To: linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Deadlock (un-killable processes) in sys_futex After fuzzing the linux kernel (3.12-rc4) I have two processes which are stuck in an un-killable state. This is not specific to 3.12-rc4, as I'm able to reproduce it on most modern kernels (e.g. Ubuntu's 3.5) after a few minutes of fuzzing with a syscall fuzzer. The debug data can be found here: http://alt.swiecki.net/linux/20327/ - process PIDs: 20327 and 13735 It includes.. ftrace report (probably the most useful): I'm not expert in this kernel area (futex/mm), but it seems like a constatnt loop between fault_in_user_writeable() and do_page_fault(): http://alt.swiecki.net/linux/20327/20327.trace.report.txt /proc/pid/maps, /proc/pid/status: http://alt.swiecki.net/linux/20327/20327.maps.txt http://alt.swiecki.net/linux/20327/20327.status.txt kdb stacktraces showing that both processes (single-threaded) are stuck in sys_futex: http://alt.swiecki.net/linux/20327/20327.kdb.txt http://alt.swiecki.net/linux/20327/13735.kdb.txt kgdb stacktraces displaying rather corrupted data: http://alt.swiecki.net/linux/20327/20327.kgdb.txt http://alt.swiecki.net/linux/20327/13735.kgdb.txt kernel conf: http://alt.swiecki.net/linux/20327/config-3.12-rc4.txt -- Robert Święcki -- 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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