[Bug 1047885] Re: cupsd crashed with SIGSEGV in malloc_consolidate()

[Till Kamppeter]

cupsd crashed when re-loading the cupsd.conf file for a configuration
change (probably on SIGHUP), simply on

fp = calloc(1, sizeof(cups_file_t))

where cups_file_t is a data structure with a size of ~8000 bytes.

This call should work when there is enough memory available and return
NULL otherwise. Looks like a possible bug in libc.

** Also affects: eglibc (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  cupsd crashed with SIGSEGV in malloc_consolidate()

Status in “cups” package in Ubuntu:
  New
Status in “eglibc” package in Ubuntu:
  New

Bug description:
  Crash occurred during apt-get upgrade of 12.10

  ProblemType: Crash
  DistroRelease: Ubuntu 12.10
  Package: cups 1.6.1-0ubuntu5
  ProcVersionSignature: Ubuntu 3.5.0-11.11-generic 3.5.2
  Uname: Linux 3.5.0-11-generic x86_64
  ApportVersion: 2.5.1-0ubuntu7
  Architecture: amd64
  CrashCounter: 1
  Date: Sat Sep  8 11:15:46 2012
  ExecutablePath: /usr/sbin/cupsd
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120822)
  Lpstat: device for HP_Photosmart_1210: hp:/usb/Photosmart_C4100_series?serial=MY73EH528Q04J7
  MachineType: Si G41M-P33
  Papersize: letter
  PpdFiles: HP_Photosmart_1210: HP Photosmart c4100 Series, hpcups 3.12.6
  ProcAttrCurrent: /usr/sbin/cupsd (enforce)
  ProcCmdline: BOOT_IMAGE=/boot/vmlinuz-3.5.0-11-generic root=UUID=9a19df88-bb2b-4aac-b377-e5e6a2b54bd2 ro quiet splash vt.handoff=7
  ProcEnviron:
   PATH=(custom, no user)
   TERM=linux
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-11-generic root=UUID=9a19df88-bb2b-4aac-b377-e5e6a2b54bd2 ro quiet splash vt.handoff=7
  SegvAnalysis:
   Segfault happened at: 0x7f0b778c1778:	mov    0x8(%r12),%r15
   PC (0x7f0b778c1778) ok
   source "0x8(%r12)" (0xfe16f2079f60) not located in a known VMA region (needed readable region)!
   destination "%r15" ok
  SegvReason: reading unknown VMA
  Signal: 11
  SourcePackage: cups
  StacktraceTop:
   ?? () from /lib/x86_64-linux-gnu/libc.so.6
   ?? () from /lib/x86_64-linux-gnu/libc.so.6
   calloc () from /lib/x86_64-linux-gnu/libc.so.6
   cupsFileOpenFd () from /usr/lib/x86_64-linux-gnu/libcups.so.2
   cupsFileOpen () from /usr/lib/x86_64-linux-gnu/libcups.so.2
  Title: cupsd crashed with SIGSEGV in calloc()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  dmi.bios.date: 01/05/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V7.7
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: G41M-P33 (MS-7592)
  dmi.board.vendor: MSI
  dmi.board.version: 3.0
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 3.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV7.7:bd01/05/2010:svnSi:pnG41M-P33:pvr3.0:rvnMSI:rnG41M-P33(MS-7592):rvr3.0:cvnMSI:ct3:cvr3.0:
  dmi.product.name: G41M-P33
  dmi.product.version: 3.0
  dmi.sys.vendor: Si
  mtime.conffile..etc.cups.cupsd.conf: 2012-08-23T19:06:22.474571

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