[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

Bug#894827: apache2: Apache workers are hanging after reload


No this is not a new bug. We have been investigating this since January.

Rob (Dan's colleague).

On April 05, 2018 08:18 Stefan Fritsch wrote:

Hi Dan,

On April 04, 2018 17:18 Debian Bug Tracking System wrote:

Thank you for filing a new Bug report with Debian.

You can follow progress on this Bug here: 894827: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=894827.

This is an automatically generated reply to let you know your message
has been received.

Your message is being forwarded to the package maintainers and other
interested parties for their attention; they will reply in due course.

Your message has been sent to the package maintainer(s):
 Debian Apache Maintainers <debian-apache@lists.debian.org>

If you wish to submit further information on this problem, please
send it to 894827@bugs.debian.org.

Please do not send mail to owner@bugs.debian.org unless you wish
to report a problem with the Bug-tracking system.

On April 04, 2018 16:56 Dogsbody Technology Support wrote:

Package: apache2
Version: 2.4.10-10+deb8u12
Severity: normal

Dear Maintainer,

I am finding some Apache processes stuck in a gracefully finishing state after an Apache reload. The only way to clear these processes down is to restart Apache or killing the individual processes.
The way these processes are being left the stuck thread 100% CPU and eventually crashing the server. 
I have seen these hung processes stay running for over 12 hours before I manually kill them. 

This seems to only be when the reload catches a large request to my website. Unfortunately I have been unsuccessful to replicate this issue anywhere outside of my production environment.

We are using Apache to process PHP behind a NGINX proxy.

-- Package-specific info:

-- System Information:
Debian Release: 8.10
  APT prefers oldstable
  APT policy: (500, 'oldstable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.16.0-4-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages apache2 depends on:
ii  apache2-bin    2.4.10-10+deb8u12
ii  apache2-data   2.4.10-10+deb8u12
ii  apache2-utils  2.4.10-10+deb8u12
ii  dpkg           1.17.27
ii  lsb-base       4.1+Debian13+nmu1
ii  mime-support   3.58
ii  perl           5.20.2-3+deb8u9
ii  procps         2:3.3.9-9

Versions of packages apache2 recommends:
ii  ssl-cert  1.0.35

Versions of packages apache2 suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  w3m [www-browser]                                0.5.3-19+deb8u2

Versions of packages apache2-bin depends on:
ii  libapr1                  1.5.1-3
ii  libaprutil1              1.5.4-1
ii  libaprutil1-dbd-sqlite3  1.5.4-1
ii  libaprutil1-ldap         1.5.4-1
ii  libc6                    2.19-18+deb8u10
ii  libldap-2.4-2            2.4.40+dfsg-1+deb8u3
ii  liblua5.1-0              5.1.5-7.1
ii  libpcre3                 2:8.35-3.3+deb8u4
ii  libssl1.0.0              1.0.1t-1+deb8u8
ii  libxml2                  2.9.1+dfsg1-5+deb8u6
ii  perl                     5.20.2-3+deb8u9
ii  zlib1g                   1:1.2.8.dfsg-2+b1

Versions of packages apache2-bin suggests:
pn  apache2-doc                                      <none>
pn  apache2-suexec-pristine | apache2-suexec-custom  <none>
ii  w3m [www-browser]                                0.5.3-19+deb8u2

Versions of packages apache2 is related to:
ii  apache2      2.4.10-10+deb8u12
ii  apache2-bin  2.4.10-10+deb8u12

-- Configuration Files:
/etc/apache2/mods-available/mpm_prefork.conf changed:
<IfModule mpm_prefork_module>
	StartServers			 5
	MinSpareServers		  5
	MaxSpareServers		 10
        MaxRequestWorkers         110
        MaxConnectionsPerChild   30000
	GracefulShutdownTimeout 60

/etc/apache2/mods-available/mpm_worker.conf changed:
<IfModule mpm_worker_module>
	StartServers			 2
	MinSpareThreads		 25
	MaxSpareThreads		 75
	ThreadLimit			 64
	ThreadsPerChild		 25
	MaxRequestWorkers	  300
	MaxConnectionsPerChild   0

/etc/apache2/mods-available/status.conf changed:
<IfModule mod_status.c>
	# Allow server status reports generated by mod_status,
	# with the URL of http://servername/server-status
	# Uncomment and change the "" to allow access from other hosts.
	<Location /server-status>
		SetHandler server-status
		Require local
		#Require ip
	# Keep track of extended status information for each request
	ExtendedStatus On
	# Determine if mod_status displays the first 63 characters of a request or
	# the last 63, assuming the request itself is greater than 63 chars.
	# Default: Off
	#SeeRequestTail On
	SeeRequestTail On
	<IfModule mod_proxy.c>
		# Show Proxy LoadBalancer status in mod_status
		ProxyStatus On

/etc/apache2/ports.conf changed:
NameVirtualHost *:81
Listen 81

-- no debconf information
Dogsbody Technology Ltd : http://www.dogsbodytechnology.com/
Dogsbody Hosting : http://www.dogsbodyhosting.net/

Reply to: