[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Launchpad Bug Tracker]

This bug was fixed in the package mdadm - 3.3-2ubuntu7.6

---
mdadm (3.3-2ubuntu7.6) xenial; urgency=medium

  * Prevent segfault when get_md_name() returns NULL
This fixes mdadm segfaults when running inside a container.
(LP: #1617919)

 -- Dan Streetman   Mon, 09 Oct 2017
10:06:22 -0400

** Changed in: mdadm (Ubuntu Xenial)
   Status: Fix Committed => Fix Released

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Launchpad Bug Tracker]

This bug was fixed in the package mdadm - 3.2.5-5ubuntu4.4

---
mdadm (3.2.5-5ubuntu4.4) trusty; urgency=medium

  * Prevent segfault when get_md_name() returns NULL
This fixes mdadm segfaults when running inside a container.
(LP: #1617919)

 -- Dan Streetman   Mon, 09 Oct 2017
10:06:22 -0400

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

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

>From inside xenial container, with raid array in host:


ubuntu@mdadm:~$ dpkg -l | grep mdadm
ii  mdadm3.3-2ubuntu7.5 
amd64tool to administer Linux MD arrays (software RAID)
ubuntu@mdadm:~$ mdadm --monitor --scan -1
Segmentation fault (core dumped)

with -proposed mdadm:

ubuntu@mdadm:~$ dpkg -l | grep mdadm
ii  mdadm3.3-2ubuntu7.6 
amd64tool to administer Linux MD arrays (software RAID)
ubuntu@mdadm:~$ mdadm --monitor --scan -1
ubuntu@mdadm:~$ 


in trusty container:

ubuntu@mdadm-trusty:~$ dpkg -l | grep mdadm
ii  mdadm3.2.5-5ubuntu4.3   
amd64tool to administer Linux MD arrays (software RAID)
ubuntu@mdadm-trusty:~$ mdadm --monitor --scan -1
Segmentation fault (core dumped)


with -proposed mdadm:

ubuntu@mdadm-trusty:~$ dpkg -l | grep mdadm
ii  mdadm3.2.5-5ubuntu4.4   
amd64tool to administer Linux MD arrays (software RAID)
ubuntu@mdadm-trusty:~$ mdadm --monitor --scan -1
ubuntu@mdadm-trusty:~$ 


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

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Chris J Arges]

Hello Johan, or anyone else affected,

Accepted mdadm into xenial-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/mdadm/3.3-2ubuntu7.6
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-xenial to verification-done-xenial. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-xenial. 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!

** Changed in: mdadm (Ubuntu Xenial)
   Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-xenial

** Changed in: mdadm (Ubuntu Trusty)
   Status: In Progress => Fix Committed

** Tags added: verification-needed-trusty

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Changed in: mdadm (Ubuntu Trusty)
   Status: Triaged => In Progress

** Changed in: mdadm (Ubuntu Xenial)
   Status: Triaged => In Progress

** Tags removed: sts-sponsor-ddstreet
** Tags added: sts-sponsor-ddstreet-done

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Changed in: mdadm (Ubuntu Trusty)
 Assignee: Dimitri John Ledkov (xnox) => Dan Streetman (ddstreet)

** Changed in: mdadm (Ubuntu Xenial)
 Assignee: Dimitri John Ledkov (xnox) => Dan Streetman (ddstreet)

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Tags added: sts-sponsor-ddstreet

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dimitri John Ledkov]

** Also affects: mdadm (Ubuntu Xenial)
   Importance: Undecided
   Status: New

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

** Changed in: mdadm (Ubuntu)
 Assignee: Dan Streetman (ddstreet) => (unassigned)

** Changed in: mdadm (Ubuntu)
   Status: In Progress => Fix Released

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

** Changed in: mdadm (Ubuntu Xenial)
   Status: New => Triaged

** Changed in: mdadm (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: mdadm (Ubuntu Xenial)
   Importance: Undecided => High

** Changed in: mdadm (Ubuntu Trusty)
 Assignee: (unassigned) => Dimitri John Ledkov (xnox)

** Changed in: mdadm (Ubuntu Xenial)
 Assignee: (unassigned) => Dimitri John Ledkov (xnox)

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Ubuntu Foundations Team Bug Bot]

The attachment "lp1617919-trusty.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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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

verified the patch fixes this on xenial and trusty using test ppa from
comment 8

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

this is fixed upstream already by commit
https://github.com/neilbrown/mdadm/commit/1e08717f0b7856b389e9d5eb2dc330d146636183

that commit is included in zesty and later, this is needed only for
trusty and xenial

** Description changed:

- On Ubuntu 16.04.1 LTS Xenial, mdadm segfaults every day on two machines.
- Everything works as normal though, and the RAID arrays are not degraded.
+ [impact]
+ 
+ the mdadm cron jobs invoke mdadm to scan raid arrays periodically, but
+ when inside a unpriviledged container mdadm does not have access to the
+ arrays, and it segfaults when invoked.  This is logged in the host
+ system's logs, and while harmless, causes confusion about mdadm
+ segfaults in the host logs.
+ 
+ [test case]
+ 
+ install a ubuntu system and create one or more raid/mdadm arrays.
+ create a container, with either trusty or xenial inside the container.
+ in the container, install mdadm.  Run:
+ 
+ $ mdadm --monitor --scan --oneshot
+ 
+ that is the command run by mdadm's cronjob (though other variations on
+ the command will also segfault).  With the current mdadm code, mdadm
+ will segfault.  With the patched code, mdadm exits normally.
+ 
+ [regression potential]
+ 
+ this patch changes mdadm's code that processes each array's name; a bug
+ in this area may cause mdadm to fail when performing any operation on
+ arrays, but not during the operation, the failure would occur before
+ mdadm opened the array.
+ 
+ [other info]
+ 
+ this commit fixing this is already upstream and included in zesty and
+ later; this is required only for trusty and xenial.
+ 
+ 
+ [original description]
+ 
+ 
+ On Ubuntu 16.04.1 LTS Xenial, mdadm segfaults every day on two machines. 
Everything works as normal though, and the RAID arrays are not degraded.
  
  [3712474.763430] mdadm[17665]: segfault at 0 ip 7fd0369bed16 sp 
7fff8c5c9478 error 4 in libc-2.23.so[7fd036934000+1c]
  [3712474.949633] mdadm[17727]: segfault at 0 ip 7f2814111d16 sp 
7ffca92fe168 error 4 in libc-2.23.so[7f2814087000+1c]
  [3798863.008741] mdadm[25359]: segfault at 0 ip 7fa6af198d16 sp 
7ffc1b253e48 error 4 in libc-2.23.so[7fa6af10e000+1c]
  [3798863.190382] mdadm[25393]: segfault at 0 ip 7f72218a0d16 sp 
7ffef918f118 error 4 in libc-2.23.so[7f7221816000+1c]
  [3885251.386711] mdadm[32081]: segfault at 0 ip 7f3d99ca2d16 sp 
7ffe5e69a7a8 error 4 in libc-2.23.so[7f3d99c18000+1c]
  [3885251.402337] mdadm[32083]: segfault at 0 ip 7f770ccc1d16 sp 
7ffe16074378 error 4 in libc-2.23.so[7f770cc37000+1c]
  [3971638.258574] mdadm[7936]: segfault at 0 ip 7fcacddb3d16 sp 
7ffc062faff8 error 4 in libc-2.23.so[7fcacdd29000+1c]
  [3971638.410750] mdadm[8053]: segfault at 0 ip 7ff573757d16 sp 
7fffd3cca398 error 4 in libc-2.23.so[7ff5736cd000+1c]
  
  The segfault message always appears twice in quick succession.
  
  It seems to be triggered by /etc/cron.daily/mdadm which essentially runs
  mdadm --monitor --scan --oneshot
  
  As such, the frequency is around every 85000 seconds or 24 hours give or
  take, depending on when the cron job was executed.
  
  It does not happen when running the command manually.
  
  There is one similar bug #1576055 concerning libc and a few cases
  elsewhere but further digging into this has yet to reveal anything
  conclusive.
  
  Note that these machines have almost exactly the same hardware (Xeon
  D-1518, 16GB ECC), so hardware design flaws cannot be ruled out.
  However, memory testing has not turned up any faults. That said, I know
  some segfaults can be difficult to find even when they are hardware
  issues.

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

test ppa with fixed mdadm:
https://launchpad.net/~ddstreet/+archive/ubuntu/lp1617919

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Patch added: "lp1617919-xenial.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1617919/+attachment/4965923/+files/lp1617919-xenial.debdiff

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Patch added: "lp1617919-trusty.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/1617919/+attachment/4965922/+files/lp1617919-trusty.debdiff

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Dan Streetman]

** Changed in: mdadm (Ubuntu)
 Assignee: (unassigned) => Dan Streetman (ddstreet)

** Changed in: mdadm (Ubuntu)
   Importance: Undecided => Low

** Changed in: mdadm (Ubuntu)
   Status: Confirmed => In Progress

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[claus]

I just got the following feedback from Stéphane Graber (LXC and LXD
project leader):

"It's not a bug for it to be installed as the Ubuntu image we run is bit
for bit identical to what's run on the cloud or on physical servers and
that's on purpose.

mdadm is supposed to be configured in a way that it won't actually start
in a container, if it does, that's a bug.

I suspect the issue here is that the cronjob wasn't made aware that
mdadm doesn't run in a container and so attempts to run despite mdadm
being stopped and it not having any access to the devices it needs."

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Johan Ehnberg]

Yes this makes a lot of sense. The situation is the same for me, but I
started automatically removing a list of packages from my lxd containers
- including mdadm. That's why the problem disappeared.

Mdadm could still make sense in a container (privileged with raw access
to devices etc.) but considering what containers are typically used for
that should be quite rare. So at least as a workaround when mdadm is not
needed, removing mdadm is an option.

So we have confirmed this. Is anyone on linux-raid? Lxd devs may also be
interested.

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[claus]

Ok, I think I made some progress tracking this thing down:
On the host, where I experienced the bug, I have an LXD/LXC container running.
It turns out that mdadm is installed by default inside a container created by 
"lxc launch ubunut:16.04 c1"
And when I call /etc/cron.daily/mdadm inside the container I get the segfault 
which is also logged in the host system.
So I think there are two bugs here:
a) mdadm should not segfault
b) mdadm should not be in the container by default (makes no sense, right?) For 
this part I think a separate bug should be filed somewhere, but I have no clue 
where this should be put?

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Title:
  mdadm segfault error 4 in libc-2.23.so

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[claus]

This morning I had that message for the first time (server is up with this 
package setup for several days now):
Oct 28 08:25:01 apphost1 kernel: [331502.883078] mdadm[19974]: segfault at 0 ip 
7f99f55d4d16 sp 75dbc7d8 error 4 in 
libc-2.23.so[7f99f554a000+1c]

Versions of packages are:
libc-bin   2.23-0ubuntu3
linux-image-generic4.4.0.45.48
mdadm  3.3-2ubuntu7.1

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Andrew Martin]

I'm still seeing this on 4.4.0-38-generic and the same versions of libc
and mdadm that you listed in comment 2

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Johan Ehnberg]

With the latest updates and a reboot and a few days of uptime, the message has 
not yet reappeared. This may have been fixed?
linux-image 4.4.0-36-generic
libc 2.23-0ubuntu3
mdadm 3.3-2ubuntu7.1

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[Bug 1617919] Re: mdadm segfault error 4 in libc-2.23.so

[Launchpad Bug Tracker]

Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: mdadm (Ubuntu)
   Status: New => Confirmed

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