[Bug 1174444] Re: ps segfault when users have large numbers of group memberships (procps 3.2.8)

[Steve Boardwell]

Hi Bryan,

I hope this helps a little. I am also affecting by this bug.

Our company are currently in the process of evaluating Ubuntu as a means
of offering our empoyees the chance to work on a Linux OS.

The problem occurs after I joined our company's domain, thus getting all
my AD groups. I cannot publish the results of the getent group or
password, but to give you an idea of the scale:

groupoutput contains 343 entries. Of those entries, around 20 are ~2000 character in length (containing a large number of usernames)
passwdoutput contains 35 entries with nothing spectacular. 

I would be very helpful if a solution could be found for 12.04 as the
management would like to stay with the LTS Release.

Thanks for all the good work.

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https://bugs.launchpad.net/bugs/1174444

Title:
  ps segfault when users have large numbers of group memberships (procps
  3.2.8)

Status in “procps” package in Ubuntu:
  Incomplete

Bug description:
  When a user logs in via ssh with a large number of group memberships
  it causes a seg fault when running ps (procps version 3.2.8).

  Description:	Ubuntu 12.04.2 LTS
  Release:	12.04

  procps:
    Installed: 1:3.2.8-11ubuntu6
    Candidate: 1:3.2.8-11ubuntu6
    Version table:
   *** 1:3.2.8-11ubuntu6 0
          500 http://us.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
          100 /var/lib/dpkg/status

  Expected results: ps completes and returns to prompt

    PID TTY          TIME CMD
  12707 pts/1    00:00:00 sudo
  12708 pts/1    00:00:00 bash

  Actual results:

    PID TTY          TIME CMD
  12707 pts/1    00:00:00 sudo
  12708 pts/1    00:00:00 bash

  
  Signal 11 (SEGV) caught by ps (procps version 3.2.8).

  
  Here is the end of a strace on a ps:

  mmap(NULL, 135168, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f4da880e000
  mremap(0x7f4da880e000, 135168, 266240, MREMAP_MAYMOVE) = 0x7f4da87cd000
  mremap(0x7f4da87cd000, 266240, 528384, MREMAP_MAYMOVE) = 0x7f4da929d000
  mremap(0x7f4da929d000, 528384, 1052672, MREMAP_MAYMOVE) = 0x7f4da919c000
  mremap(0x7f4da919c000, 1052672, 2101248, MREMAP_MAYMOVE) = 0x7f4da862e000
  mremap(0x7f4da862e000, 2101248, 4198400, MREMAP_MAYMOVE) = 0x7f4da822d000
  mremap(0x7f4da822d000, 4198400, 8392704, MREMAP_MAYMOVE) = 0x7f4da7a2c000
  mremap(0x7f4da7a2c000, 8392704, 16781312, MREMAP_MAYMOVE) = 0x7f4da6a2b000
  mremap(0x7f4da6a2b000, 16781312, 33558528, MREMAP_MAYMOVE) = 0x7f4da4a2a000
  mremap(0x7f4da4a2a000, 33558528, 67112960, MREMAP_MAYMOVE) = 0x7f4da0a29000
  mremap(0x7f4da0a29000, 67112960, 134221824, MREMAP_MAYMOVE) = 0x7f4d98a28000
  mremap(0x7f4d98a28000, 134221824, 268439552, MREMAP_MAYMOVE) = 0x7f4d88a27000
  mremap(0x7f4d88a27000, 268439552, 536875008, MREMAP_MAYMOVE) = 0x7f4d68a26000
  mremap(0x7f4d68a26000, 536875008, 1073745920, MREMAP_MAYMOVE) = 0x7f4d28a25000
  mremap(0x7f4d28a25000, 1073745920, 2147487744, MREMAP_MAYMOVE) = 0x7f4ca8a24000
  mremap(0x7f4ca8a24000, 2147487744, 4096, MREMAP_MAYMOVE) = 0x7f4ca8a24000
  --- SIGSEGV (Segmentation fault) @ 0 (0) ---
  write(2, "\n\nSignal 11 (SEGV) caught by ps "..., 132

  Signal 11 (SEGV) caught by ps (procps version 3.2.8).
  Please send bug reports to <feedback at lists.sf.net> or <albert at users.sf.net>
  ) = 132
  exit_group(139)

  
  Here is the debian bug report on it.
  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=702965

  It looks like the 12.10 repos have the newer version of the procps and
  libprocps0 packages which address the problem.

  My question being can these newer version be put into place for 12.04
  or am I stuck trying to manually intall a newer version fro the 12.10
  repos or something along those lines to fix this issue.

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