[Bug 1376274] Re: unscd segfaults regularly

[Launchpad Bug Tracker]

This bug was fixed in the package unscd - 0.51-1ubuntu1

---
unscd (0.51-1ubuntu1) trusty-proposed; urgency=medium

  * Backport of full 0.52 release which just contains one NULL
pointer check. (LP: #1376274)

 -- Bryan Quigley   Thu, 27 Oct 2016
18:44:09 +

** Changed in: unscd (Ubuntu Trusty)
   Status: Fix Committed => Fix Released

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[Bug 1376274] Re: unscd segfaults regularly

[Stephen A. Zarkos]

I've tested unscd with the patch and saw no issues, but unfortunately
there is no simple repro script that generates the failure. Customers
just see this issue appear after some time of running the service.

The customer in comment #3 also confirmed that unscd_0.52-1 fixes the
issue for them, and this null pointer check is the only change in that
release. To me this seems low risk to keep the null pointer check and
release this.


** Tags removed: verification-needed
** Tags added: verification-done

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[Bug 1376274] Re: unscd segfaults regularly

[Bryan Quigley]

I've asked for testing privately with no luck.  I think this will have
to be removed.

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[Bug 1376274] Re: unscd segfaults regularly

[Tamas Papp]

Sorry, I have already switched to sssd, cannot test the fix.

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[Bug 1376274] Re: unscd segfaults regularly

[Brian Murray]

Hello Tamas, or anyone else affected,

Accepted unscd into trusty-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/unscd/0.51-1ubuntu1 in
a few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed.  In either case, details of your testing will help
us make a better decision.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

** Tags added: verification-needed

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[Bug 1376274] Re: unscd segfaults regularly

[Sebastien Bacher]

the debdiff has been uploaded, unsubscribing the sponsors

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[Bug 1376274] Re: unscd segfaults regularly

[Bryan Quigley]

Thanks Daniel!

I unfortunately don't have a test case.  Anyone else who has this bug,
please provide one so we can get this fixed.

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[Bug 1376274] Re: unscd segfaults regularly

[Daniel Holbach]

I uploaded the change. Can you please add a test-case for the ubuntu-sru
team to the description to the bug?

** Changed in: unscd (Ubuntu Trusty)
   Status: Triaged => Fix Committed

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[Bug 1376274] Re: unscd segfaults regularly

[Jeremy Bicha]

** Also affects: unscd (Ubuntu Trusty)
   Importance: Undecided
   Status: New

** Changed in: unscd (Ubuntu)
   Status: Confirmed => Fix Released

** Changed in: unscd (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: unscd (Ubuntu Trusty)
   Status: New => Triaged

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[Bug 1376274] Re: unscd segfaults regularly

[Mathew Hodson]

** Changed in: unscd (Ubuntu)
   Importance: Undecided => Medium

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[Bug 1376274] Re: unscd segfaults regularly

[Ubuntu Foundations Team Bug Bot]

The attachment "unscd_0.51-1ubuntu1.debdiff" seems to be a debdiff.  The
ubuntu-sponsors team has been subscribed to the bug report so that they
can review and hopefully sponsor the debdiff.  If the attachment isn't a
patch, please remove the "patch" flag from the attachment, remove the
"patch" tag, and if you are member of the ~ubuntu-sponsors, unsubscribe
the team.

[This is an automated message performed by a Launchpad user owned by
~brian-murray, for any issue please contact him.]

** Tags added: patch

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[Bug 1376274] Re: unscd segfaults regularly

[Bryan Quigley]

I've created a debdiff to backport the fix to 14.04. We could use more
details on both the impact and a step-by-step way (from a fresh cloud
image) to reproduce the bug.

** Description changed:

- kern.log:Oct  1 11:34:51 camel kernel: [1715974.313870] nscd[11501]:
- segfault at 0 ip 00403b71 sp 7fff8ba4def0 error 4 in
- nscd[40+8000]
+ [Impact]
  
+  * It's causing a crash.
+ 
+ [Test Case]
+ 
+  * detailed instructions how to reproduce the bug
+ 
+ [Regression Potential]
+ 
+  * The fix just checks for one NULL pointer, and it's been in 16.04 and
+ above since release, per comment #3.
+ 
+ 
+ Original Report:
+ kern.log:Oct  1 11:34:51 camel kernel: [1715974.313870] nscd[11501]: segfault 
at 0 ip 00403b71 sp 7fff8ba4def0 error 4 in nscd[40+8000]
  
  unscd is getting died after a not very long time.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unscd 0.51-1build2
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  NonfreeKernelModules: vhost_net vhost macvtap macvlan ipt_MASQUERADE 
iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack 
nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp ip6table_filter 
ip6_tables iptable_filter ip_tables x_tables veth bridge stp llc gpio_ich 
x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul 
crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul 
glue_helper ablk_helper cryptd sb_edac joydev edac_core mei_me mei lpc_ich 
ipmi_si wmi ioatdma mac_hid lp parport zfs zunicode zavl zcommon znvpair spl 
btrfs libcrc32c raid10 raid456 async_raid6_recov async_memcpy async_pq 
async_xor async_tx xor igb raid6_pq i2c_algo_bit raid1 isci mpt2sas hid_generic 
dca raid0 libsas usbhid raid_class ptp ahci multipath hid libahci 
scsi_transport_sas pps_core linear
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  Date: Wed Oct  1 15:49:48 2014
  Dependencies:
-  gcc-4.9-base 4.9.1-0ubuntu1
-  libc6 2.19-0ubuntu6.3
-  libgcc1 1:4.9.1-0ubuntu1
-  multiarch-support 2.19-0ubuntu6.3
+  gcc-4.9-base 4.9.1-0ubuntu1
+  libc6 2.19-0ubuntu6.3
+  libgcc1 1:4.9.1-0ubuntu1
+  multiarch-support 2.19-0ubuntu6.3
  SourcePackage: unscd
  UpgradeStatus: Upgraded to trusty on 2014-06-04 (119 days ago)

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[Bug 1376274] Re: unscd segfaults regularly

[Bryan Quigley]

Here is a debdiff that backports the single NULL check (which is all of
0.52) to Trusty.

** Patch added: "unscd_0.51-1ubuntu1.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/unscd/+bug/1376274/+attachment/4768340/+files/unscd_0.51-1ubuntu1.debdiff

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[Bug 1376274] Re: unscd segfaults regularly

[Bryan Quigley]

** Changed in: unscd (Ubuntu)
 Assignee: (unassigned) => Bryan Quigley (bryanquigley)

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[Bug 1376274] Re: unscd segfaults regularly

[Scott Moser]

Tamas,
Please correct me if I'm wrong, but it does not look to me like sssd supports 
dns/hosts caching.

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[Bug 1376274] Re: unscd segfaults regularly

[Tamas Papp]

You better switch to sssd.

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[Bug 1376274] Re: unscd segfaults regularly

[Patrik Martinsson]

Hi,

I can confirm this behavior on all our servers running ubuntu 14.04. 
If we are going to continue to use uncsd, we really need this fix backported to 
14.04. 

I'm new here, but who decides if this is going to be fixed in 14.04 or not ? 
And when is that decision being made ?

Best regards, 
Patrik Martinsson,
Sweden

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[Bug 1376274] Re: unscd segfaults regularly

[Florian Löffler]

I have the same problem.
After starting unscd it segfaults after a short time.
If many requests occur virtually immediatly.

The attached output of valgrind supports this claim:
valgrind -v --leak-check=full --show-leak-kinds=all --trace-children=yes nscd 
-d 2>&1 | tee /tmp/valgrind.log

...
==2487== Process terminating with default action of signal 11 (SIGSEGV)
==2487==  Access not within mapped region at address 0x0
==2487==at 0x403B71: free_refcounted_ureq (nscd.c:1220)
==2487==by 0x403C72: close_client (nscd.c:808)
==2487==by 0x402544: handle_client (nscd.c:1602)
==2487==by 0x402544: main_loop (nscd.c:2027)
==2487==by 0x402544: main (nscd.c:2654)
...

This points to line 1220 in nscd.c as the source of the problem.
Problem appears to be fixed in unscd_0.52-1 (there was a NULL check added at 
exactly this code position).
Also installing a manually build package of unscd_0.52-1 fixes the problem.

Obvious resolution would be to provide an official unscd_0.52-1 package
for 14.04


** Attachment added: "valgrind.log"
   
https://bugs.launchpad.net/ubuntu/+source/unscd/+bug/1376274/+attachment/4585638/+files/valgrind.log

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[Bug 1376274] Re: unscd segfaults regularly

[Florian Löffler]

** Summary changed:

- unscd segfault
+ unscd segfaults regularly

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