group.of.nepali.translators team mailing list archive

[Paride Legovini <1712589@xxxxxxxxxxxxxxxxxx>]

I tried Andrea's reproducer on Focal and couldn't get apache2 to crash.
It's tempting to set it Fix Released, but we didn't really identify
where the problem is, so Incomplete will be.

** Changed in: mod-wsgi (Ubuntu)
       Status: Confirmed => Incomplete

** Also affects: mod-wsgi (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: mod-wsgi (Ubuntu Xenial)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1712589

Title:
  Apache2 mod-wsgi segfault on double reload

Status in mod-wsgi package in Ubuntu:
  Incomplete
Status in mod-wsgi source package in Xenial:
  Confirmed

Bug description:
  # Issue Description

  Currently, Apache generates a segmentation fault with "libapache2-mod-wsgi-py3" enabled when the process receives multiple *USR1* signals within a short amount of time. The issue is only occuring when there is a wsgi process running (see attached crash report for sample vhost config). 
  The issue might arise when "apache2ctl graceful" is triggered by logrotate as a postrotate operation several times (i.e. used in several config files).

  ## System Infos

  Description:    Ubuntu 16.04.1 LTS
  Release:        16.04
  Kernel: 4.4.0-34-generic
  Architecture: x86_64

  ## Package versions

  apache2: 2.4.18-2ubuntu3
  libapache2-mod-wsgi-py3: 4.3.0-1.1build1

  
  ## Steps to reproduce

   * Create vhost config with WSGIDaemonProcess directive and enable site
   * Issue double reload: apache2ctl graceful && apache2ctl graceful

  ## Outcome

   * Segmentation fault

  
  ## Core Dump of Apache

  
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  Core was generated by `/usr/sbin/apache2 -k start'.
  Program terminated with signal SIGSEGV, Segmentation fault.

  #0  0x00007f6b6d010640 in ?? ()
  No symbol table info available.
  #1  0x00007f6b6fcbb3d0 in __libc_sigaction (sig=10, act=0x7fffaf18b430, oact=0x7fffaf18b300)
      at ../sysdeps/unix/sysv/linux/x86_64/sigaction.c:54
          result = <optimized out>
          kact = {k_sa_handler = 0x7fffaf18b3b0, sa_flags = 140099413790480,
            sa_restorer = 0x7f6b6fcaaf18, sa_mask = {__val = {140736131019476, 140736131019680,
                94201515593344, 140097538228224, 34, 140099423149124, 1, 0, 140099425322224,
                140099425321816, 140736131019840, 140099413849040, 1, 0, 0, 140097538228226}}}
          koact = {k_sa_handler = 0x7fffaf18b8a0, sa_flags = 1, sa_restorer = 0x0, sa_mask = {
              __val = {582, 93750, 1, 140099416110048, 94201486782229, 0, 0, 0, 140099424570760, 0,
                18446744073709551612, 140099410844915, 140736131020952, 140099410844915, 582, 51}}}
  #2  0x0000000000000000 in ?? ()
  No symbol table info available.

  
  # Apport log attached

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