Bug#867565: apache2 segfaults on stop
Package: apache2
Version: 2.4.25-3+deb9u1
Severity: normal
Dear Maintainer,
Stopping or restaring apache2 produces an error in kernel log:
# systemctl apache2 stop
Jul 7 14:13:52 stretch kernel: [ 5393.547573] apache2[7588]: segfault at 7f7e1113b7a0 ip 00007f7e1113b7a0 sp 00007fff96cb0108 error 14 in libexpat.so.1.6.2[7f7e135b4000+27000]
On the other hand, calling
# apache2ctl stop
does not cause a segfault.
The core file contains the following:
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007fbf0e6c37a0 in ?? ()
#1 0x000055aef5eacf9e in ap_run_mpm_query (query_code=query_code@entry=2, result=result@entry=0x7fff4fdb01ac, _rv=_rv@entry=0x7fff4fdb0184) at mpm_common.c:97
#2 0x000055aef5eadd2e in ap_mpm_query (query_code=query_code@entry=2, result=result@entry=0x7fff4fdb01ac) at mpm_common.c:419
#3 0x000055aef5ecdb34 in log_tid (info=<optimized out>, arg=<optimized out>, buf=0x7fff4fdb02fe "", buflen=8130) at log.c:612
#4 0x000055aef5ecea56 in do_errorlog_default (buflen=8192, args=0x7fff4fdb4340, errstr_fmt=0x55aef5ef5338 "AH00060: seg fault or similar nasty error detected in the parent process",
errstr_end=<synthetic pointer>, errstr_start=<synthetic pointer>, buf=0x7fff4fdb02c0 "[Fri Jul 07 13:50:03.365295 2017] [core:notice] [pid 1351:tid ", info=0x7fff4fdb0270) at log.c:944
#5 log_error_core (file=0x55aef5ef520c "mpm_unix.c", line=989, module_index=0, level=<optimized out>, status=0, s=<optimized out>, c=<optimized out>, r=0x0, pool=0x0,
fmt=0x55aef5ef5338 "AH00060: seg fault or similar nasty error detected in the parent process", args=0x7fff4fdb4340) at log.c:1270
#6 0x000055aef5ecef37 in ap_log_error_ (file=file@entry=0x55aef5ef520c "mpm_unix.c", line=line@entry=989, module_index=module_index@entry=0, level=level@entry=5, status=status@entry=0, s=<optimized out>,
fmt=0x55aef5ef5338 "AH00060: seg fault or similar nasty error detected in the parent process") at log.c:1319
#7 0x000055aef5ed5cc0 in sig_coredump (sig=11) at mpm_unix.c:986
#8 <signal handler called>
#9 0x00007fbf0e6c38d0 in ?? ()
#10 <signal handler called>
#11 0x00007fbf116903d3 in __select_nocancel () at ../sysdeps/unix/syscall-template.S:84
#12 0x00007fbf11b93245 in apr_sleep (t=t@entry=46875) at ./time/unix/time.c:246
#13 0x00007fbf11b86ea3 in free_proc_chain (procs=0x7fbf122ede30) at ./memory/unix/apr_pools.c:2483
#14 0x00007fbf11b87b90 in apr_pool_destroy (pool=0x7fbf1244d028) at ./memory/unix/apr_pools.c:817
#15 0x00007fbf11b87b55 in apr_pool_destroy (pool=0x7fbf12454028) at ./memory/unix/apr_pools.c:811
#16 0x000055aef5ea5d18 in destroy_and_exit_process (process_exit_value=0, process=<optimized out>) at main.c:264
#17 0x000055aef5ea5ad7 in main (argc=<optimized out>, argv=<optimized out>) at main.c:796
-- Package-specific info:
-- System Information:
Debian Release: 9.0
APT prefers stable
APT policy: (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.9.0-3-amd64 (SMP w/2 CPU cores)
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968), LANGUAGE=C (charmap=ANSI_X3.4-1968)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages apache2 depends on:
ii apache2-bin 2.4.25-3+deb9u1
ii apache2-data 2.4.25-3+deb9u1
ii apache2-utils 2.4.25-3+deb9u1
ii dpkg 1.18.24
ii init-system-helpers 1.48
ii lsb-base 9.20161125
ii mime-support 3.60
ii perl 5.24.1-3
ii procps 2:3.3.12-3
Versions of packages apache2 recommends:
ii ssl-cert 1.0.39
Versions of packages apache2 suggests:
pn apache2-doc <none>
pn apache2-suexec-pristine | apache2-suexec-custom <none>
pn www-browser <none>
Versions of packages apache2-bin depends on:
ii libapr1 1.5.2-5
ii libaprutil1 1.5.4-3
ii libaprutil1-dbd-sqlite3 1.5.4-3
ii libaprutil1-ldap 1.5.4-3
ii libc6 2.24-11+deb9u1
ii libldap-2.4-2 2.4.44+dfsg-5
ii liblua5.2-0 5.2.4-1.1+b2
ii libnghttp2-14 1.18.1-1
ii libpcre3 2:8.39-3
ii libssl1.0.2 1.0.2l-2
ii libxml2 2.9.4+dfsg1-2.2
ii perl 5.24.1-3
ii zlib1g 1:1.2.8.dfsg-5
Versions of packages apache2-bin suggests:
pn apache2-doc <none>
pn apache2-suexec-pristine | apache2-suexec-custom <none>
pn www-browser <none>
Versions of packages apache2 is related to:
ii apache2 2.4.25-3+deb9u1
ii apache2-bin 2.4.25-3+deb9u1
-- Configuration Files:
/etc/apache2/sites-available/default-ssl.conf changed:
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn
ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined
# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf
# SSL Engine Switch:
# Enable/Disable SSL for this virtual host.
SSLEngine on
# A self-signed (snakeoil) certificate can be created by installing
# the ssl-cert package. See
# /usr/share/doc/apache2/README.Debian.gz for more info.
# If both key and certificate are stored in the same file, only the
# SSLCertificateFile directive is needed.
SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem
SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key
# Server Certificate Chain:
# Point SSLCertificateChainFile at a file containing the
# concatenation of PEM encoded CA certificates which form the
# certificate chain for the server certificate. Alternatively
# the referenced file can be the same as SSLCertificateFile
# when the CA certificates are directly appended to the server
# certificate for convinience.
#SSLCertificateChainFile /etc/apache2/ssl.crt/server-ca.crt
# Certificate Authority (CA):
# Set the CA certificate verification path where to find CA
# certificates for client authentication or alternatively one
# huge file containing all of them (file must be PEM encoded)
# Note: Inside SSLCACertificatePath you need hash symlinks
# to point to the certificate files. Use the provided
# Makefile to update the hash symlinks after changes.
#SSLCACertificatePath /etc/ssl/certs/
#SSLCACertificateFile /etc/apache2/ssl.crt/ca-bundle.crt
# Certificate Revocation Lists (CRL):
# Set the CA revocation path where to find CA CRLs for client
# authentication or alternatively one huge file containing all
# of them (file must be PEM encoded)
# Note: Inside SSLCARevocationPath you need hash symlinks
# to point to the certificate files. Use the provided
# Makefile to update the hash symlinks after changes.
#SSLCARevocationPath /etc/apache2/ssl.crl/
#SSLCARevocationFile /etc/apache2/ssl.crl/ca-bundle.crl
# Client Authentication (Type):
# Client certificate verification type and depth. Types are
# none, optional, require and optional_no_ca. Depth is a
# number which specifies how deeply to verify the certificate
# issuer chain before deciding the certificate is not valid.
#SSLVerifyClient require
#SSLVerifyDepth 10
# SSL Engine Options:
# Set various options for the SSL engine.
# o FakeBasicAuth:
# Translate the client X.509 into a Basic Authorisation. This means that
# the standard Auth/DBMAuth methods can be used for access control. The
# user name is the `one line' version of the client's X.509 certificate.
# Note that no password is obtained from the user. Every entry in the user
# file needs this password: `xxj31ZMTZzkVA'.
# o ExportCertData:
# This exports two additional environment variables: SSL_CLIENT_CERT and
# SSL_SERVER_CERT. These contain the PEM-encoded certificates of the
# server (always existing) and the client (only existing when client
# authentication is used). This can be used to import the certificates
# into CGI scripts.
# o StdEnvVars:
# This exports the standard SSL/TLS related `SSL_*' environment variables.
# Per default this exportation is switched off for performance reasons,
# because the extraction step is an expensive operation and is usually
# useless for serving static content. So one usually enables the
# exportation for CGI and SSI requests only.
# o OptRenegotiate:
# This enables optimized SSL connection renegotiation handling when SSL
# directives are used in per-directory context.
#SSLOptions +FakeBasicAuth +ExportCertData +StrictRequire
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
# SSL Protocol Adjustments:
# The safe and default but still SSL/TLS standard compliant shutdown
# approach is that mod_ssl sends the close notify alert but doesn't wait for
# the close notify alert from client. When you need a different shutdown
# approach you can use one of the following variables:
# o ssl-unclean-shutdown:
# This forces an unclean shutdown when the connection is closed, i.e. no
# SSL close notify alert is send or allowed to received. This violates
# the SSL/TLS standard but is needed for some brain-dead browsers. Use
# this when you receive I/O errors because of the standard approach where
# mod_ssl sends the close notify alert.
# o ssl-accurate-shutdown:
# This forces an accurate shutdown when the connection is closed, i.e. a
# SSL close notify alert is send and mod_ssl waits for the close notify
# alert of the client. This is 100% SSL/TLS standard compliant, but in
# practice often causes hanging connections with brain-dead browsers. Use
# this only for browsers where you know that their SSL implementation
# works correctly.
# Notice: Most problems of broken clients are also related to the HTTP
# keep-alive facility, so you usually additionally want to disable
# keep-alive for those clients, too. Use variable "nokeepalive" for this.
# Similarly, one has to force some clients to use HTTP/1.0 to workaround
# their broken HTTP/1.1 implementation. Use variables "downgrade-1.0" and
# "force-response-1.0" for this.
# BrowserMatch "MSIE [2-6]" \
# nokeepalive ssl-unclean-shutdown \
# downgrade-1.0 force-response-1.0
SSLProtocol -ALL +TLSv1.2 +TLSv1.1 +TLSv1
SSLCipherSuite ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS
</VirtualHost>
</IfModule>
-- no debconf information
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