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Date: Sat, 4 Apr 2009 16:24:21 -0600
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Subject: Re: IO latency - a special case (futex hangs for an hour)
From: "Trenton D. Adams" <trenton.d.adams@gmail.com>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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Here's some more output.  I wasn't able to get vmstat going before it
happened this time, as it completely locked up the machine.  I hit
Ctrl-C several times, and eventually, after nearly an hour hanging on
futex, the Ctrl-C took effect, and killed it...

strace -T -e trace=futex -o strace3.txt mvn install
futex(0x7fff7f14ab1c, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000016>
futex(0x7fff260d6a3c, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000014>
futex(0x7f941dca310c, FUTEX_WAKE_PRIVATE, 2147483647) = 0 <0.000014>
futex(0x414169e0, FUTEX_WAIT, 27400, NULL) = ? ERESTARTSYS (To be
restarted) <3206.324673>
--- SIGINT (Interrupt) @ 0 (0) ---
futex(0x7f941d722f40, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000030>
futex(0x414169e0, FUTEX_WAIT, 27400, NULL <unfinished ... exit status 130>

Yes, the kernel is well hung. :P

It appears to be similar to this guy's issue...
http://lkml.org/lkml/2004/10/3/35
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