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[Christian Reis <kiko@xxxxxxxxxxxx>]

To workaround, I'm just disabling hosts caching in /etc/nscd.conf:

-	enable-cache		hosts		yes
+	enable-cache		hosts		no

FWIW the /var/cache/nscd directory is on NFS, but disabling persistent
doesn't change the crash.


** Attachment added: "nsswitch.conf"
   https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1403516/+attachment/4282871/+files/nsswitch.conf

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https://bugs.launchpad.net/bugs/1403516

Title:
  nscd crashes upon sudo when hosts caching is enabled (NIS, NFS)

Status in eglibc package in Ubuntu:
  New

Bug description:
  We use nscd in our diskless clients, but we've found regular evidence
  of crashes in our dmesg output, and I've been able to easily reproduce
  it by running sudo ls while hosts caching is enabled. The debug output
  when running nscd -d is as follows:

  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: handle_request: request received (Version = 2) from PID 3649
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: 	GETFDPW
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: provide access to FD 5, for passwd
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: handle_request: request received (Version = 2) from PID 3649
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: 	GETFDGR
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: provide access to FD 7, for group
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: handle_request: request received (Version = 2) from PID 3649
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: 	GETFDHST
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: provide access to FD 9, for hosts
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: handle_request: request received (Version = 2) from PID 3649
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: 	GETAI (gasolinux)
  Wed 17 Dec 2014 11:42:48 AM BRST - 3627: Haven't found "gasolinux" in hosts cache!

  and then it dies.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: nscd 2.19-0ubuntu6.4
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Dec 17 11:45:11 2014
  SourcePackage: eglibc
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.nscd.conf: [modified]
  mtime.conffile..etc.nscd.conf: 2014-12-17T11:43:58.035583

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