# Mongrel hangs on FUTEX\_WAIT **URL:** \ **Category:** Deployment\ **Created:** [October 22, 2007, 9:43am UTC](https://www.ruby-forum.com/t/mongrel-hangs-on-futex-wait/117906 "2007-10-22T09:43:55Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![matthias](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/cdc98d/32.png) [@matthias](https://www.ruby-forum.com/u/matthias)\ **Post date:** [October 22, 2007, 9:43am UTC](https://www.ruby-forum.com/t/mongrel-hangs-on-futex-wait/117906/1 "2007-10-22T09:43:55Z")
Hi, my app was running on SuSE 10.2 for a couple of weeks. Suddenly it stopped working as the mongrel process sooner or later get blocked. This is reproducably happening after a few requests. It does not matter whether I run mongrel using script/server or in a cluster. I’ve to kill -9 the mongrel afterwards. A strace shows the following at the end: gettimeofday({1192791059, 693640}, NULL) = 0 select(8, [5 7], [3], [], {0, 133496}) = 1 (out [3], left {0, 133496}) gettimeofday({1192791059, 693718}, NULL) = 0 select(8, [5 7], [3], [], {0, 133418}) = 1 (out [3], left {0, 133418}) write(3, " \33[4;36;1mTrademark Load (0.001"…, 105) = 105 gettimeofday({1192791059, 693853}, NULL) = 0 select(8, [5 7], [], [], {0, 0}) = 0 (Timeout) stat64(“script/…/config/…/public//Bilder/S/s0008949/BMW/BMW-530d- touring-Edition-Sport–2001-2004-.jpg”, 0xbfe5cbc0) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de\_DE.UTF-8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de\_DE.UTF-8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de\_DE.utf8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de\_DE.utf8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de\_DE/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de\_DE/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de.UTF-8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de.UTF-8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de.utf8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de.utf8/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale-langpack/de/LC\_MESSAGES/libc.mo", O\_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/share/locale/de/LC\_MESSAGES/libc.mo", O\_RDONLY) = 9 fstat64(9, {st\_mode=S\_IFREG|0644, st\_size=123187, …}) = 0 mmap2(NULL, 123187, PROT\_READ, MAP\_PRIVATE, 9, 0) = 0xb62ff000 close(9) = 0 futex(0x85f1b10, FUTEX\_WAIT, 2, NULL Any ideas what could cause mongrel to wait here? Thanks in advance, Matthias ---
**Author:** ![matthias](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/cdc98d/32.png) [@matthias](https://www.ruby-forum.com/u/matthias)\ **Post date:** [October 24, 2007, 8:02am UTC](https://www.ruby-forum.com/t/mongrel-hangs-on-futex-wait/117906/2 "2007-10-24T08:02:15Z")
Hi, We are experiencing the same problem, we are also running SuSE 10.2 (64 bits). The application has been running without any problem for several weeks and yesterday this futex thing started (after a mongrel restart). We tried to revert back to an older kernel version without luck. Today we will probably upgrade to 10.3 or move to CentOS to see if we can avoid the issue. Any tip on how to debug this problem would be appreciated. Thanks in advance. Ramon ---
**Author:** ![matthias](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/cdc98d/32.png) [@matthias](https://www.ruby-forum.com/u/matthias)\ **Post date:** [October 24, 2007, 1:26pm UTC](https://www.ruby-forum.com/t/mongrel-hangs-on-futex-wait/117906/3 "2007-10-24T13:26:01Z")
Downgrading glibc to glibc-locale-2.5-25 solved the issue for us. We need to investigate further, but for now the problem is solved. ---
**Author:** ![matthias](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/cdc98d/32.png) [@matthias](https://www.ruby-forum.com/u/matthias)\ **Post date:** [October 25, 2007, 10:00am UTC](https://www.ruby-forum.com/t/mongrel-hangs-on-futex-wait/117906/4 "2007-10-25T10:00:35Z")
Thanks a lot for that hint! I just went to yast and let it update/ reinstall the existing glibc-locale-2.5-34.5 That solved it for us!