[Bug 53999] Deadlock between procmgr_send_spawn_cmd()/proctable_lock() in mod_fcgid and listener_thread() in worker_mpm

[bu...@apache.org]

https://bz.apache.org/bugzilla/show_bug.cgi?id=53999

--- Comment #5 from Peter Blokland <pe...@desk.nl> ---
Another Debian Jessie user chiming in. I'm seeing this error too, but I'm not
using mod_fcgi, but mod_fastcgi (which communicates via sockets with php-fpm):

[Fri Oct 02 06:40:08.558059 2015] [mpm_worker:notice] [pid 29795:tid
140436668389248] AH00292: Apache/2.4.10 (Debian)
mod_fastcgi/mod_fastcgi-SNAP-0910052141 mod_jk/1.2.37 OpenSSL/1.0.1k configured
-- resuming normal operations
[Fri Oct 02 06:40:08.558084 2015] [core:notice] [pid 29795:tid 140436668389248]
AH00094: Command line: '/usr/sbin/apache2'
[Fri Oct 02 08:06:43.819080 2015] [mpm_worker:emerg] [pid 10105:tid
140436228171520] (35)Resource deadlock avoided: AH00273: apr_proc_mutex_lock
failed. Attempting to shutdown process gracefully.
[Fri Oct 02 08:26:34.332824 2015] [mpm_worker:emerg] [pid 12883:tid
140436228171520] (35)Resource deadlock avoided: AH00273: apr_proc_mutex_lock
failed. Attempting to shutdown process gracefully.
[Fri Oct 02 10:06:00.666482 2015] [mpm_worker:emerg] [pid 25550:tid
140436228171520] (35)Resource deadlock avoided: AH00273: apr_proc_mutex_lock
failed. Attempting to shutdown process gracefully.

we just switched this machine from prefork to worker to avoid an issue where
mod_dbd would starve the database of connections.

apache2                               2.4.10-10+deb8u3
libapache2-mod-fastcgi                2.4.7~0910052141-1.1
libapache2-mod-jk                     1:1.2.37-4+deb8u1
php5-fpm                              5.6.13+dfsg-0+deb8u1  
linux-image-3.16.0-4-amd64            3.16.7-ckt11-1+deb8u4

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