Messages in this thread | | | Date | Fri, 3 Oct 2008 15:19:06 +0200 (CEST) | Subject | BUG: processes hang indefinitely | From | "Reto Glauser" <> |
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Hi,
I'm having a repeatable bug, namely that arbitrarily processes claim a CPU and hang indefinitely. They recover sometimes, be it after 5 minutes or after 30 minutes, and sometimes not.
Latest example was libtool-wrap while compiling the jpeg library:
# emerge media-libs/jpeg ...
# top 16973 root 39 19 10860 608 444 R 100 0.0 113:59.68 libtool-wrap
# while true; do cat /proc/16973/stat; sleep 1; done 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 10604 1 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 10704 1 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 10805 1 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0 ... 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 431667 65 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 431767 65 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0 16973 (libtool-wrap) R 15444 30375 6434 34816 30375 4194304 178 0 0 0 431868 65 0 0 39 19 1 0 6722416 11120640 152 18446744073709551615 4194304 4906172 140734787246416 18446744073709551615 47039760684325 0 0 16777216 0 0 0 0 17 3 0 0 0 0 0
I tried different kernels (gentoo-2.6.25, gentoo-2.6.26, git-2.6.27-rc8) and tried all three preemption models without noticing any difference (except that on git-2.6.27-rc8 processes seem never to recover). Processes which I noticed hanging are: sed, awk, rm, touch, libtool-wrap, ... It's not happening instantly, but it doesn't take long to force it to happen.
It's happening on:
# /usr/src/linux/scripts/ver_linux
Linux quadux 2.6.27-rc8-git1 #1 SMP Wed Oct 1 08:53:31 CEST 2008 x86_64 Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz GenuineIntel GNU/Linux
Gnu C 4.1.2 Gnu make 3.81 binutils 2.18 util-linux 2.13.1.1 mount 2.13.1.1 module-init-tools 3.4 e2fsprogs 1.40.9 reiserfsprogs 3.6.19 Linux C Library 2.6.1 Dynamic linker (ldd) 2.6.1 Procps 3.2.7 Net-tools 1.60 Kbd 1.13 Sh-utils 6.10 udev 124 Modules Loaded
I was *not* yet able to observe this behaviour on a x86_64 Intel(R) Core(TM)2 Duo CPU.
What can I do to get down to this issue?
Thanks, Reto
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