Bug 1315254 - [SMB] smbd core dumps are always truncated to 16M
Summary: [SMB] smbd core dumps are always truncated to 16M
Alias: None
Product: Red Hat Gluster Storage
Classification: Red Hat
Component: samba
Version: rhgs-3.1
Hardware: Unspecified
OS: Unspecified
Target Milestone: ---
: RHGS 3.1.3
Assignee: Raghavendra Talur
QA Contact: Vivek Das
Depends On:
Blocks: 1299184
TreeView+ depends on / blocked
Reported: 2016-03-07 11:36 UTC by Raghavendra Talur
Modified: 2016-06-23 05:37 UTC (History)
8 users (show)

Fixed In Version: samba-4.4.3-3
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2016-06-23 05:37:30 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2016:1248 0 normal SHIPPED_LIVE gluster-smb bug fix and enhancement update 2016-06-23 09:13:14 UTC
Samba Project 11907 0 None None None 2016-05-06 13:38:31 UTC

Description Raghavendra Talur 2016-03-07 11:36:06 UTC
Description of problem:
We find that smbd cores are always truncated to 16M. It is already fixed in Samba master and we should get it in next downstream release.

Comment 2 Raghavendra Talur 2016-03-08 12:12:55 UTC
Some more details about the bug:

Although this has been taken from some other bug, we find a similar message on opening the core file.

root@samba4-ad2:smbd# gdb core.27767
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-75.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
BFD: Warning: /var/log/samba/cores/smbd/core.27767 is truncated: expected core file size >= 33017856, found: 16830464.
BFD: Warning: /var/log/samba/cores/smbd/core.27767 is truncated: expected core file size >= 33017856, found: 16830464.
Reading symbols from /usr/sbin/smbd...Reading symbols from /usr/lib/debug/usr/sbin/smbd.debug...done.

Note found: 16830464. This is the 16M limit the core is truncated to.

Comment 4 Raghavendra Talur 2016-04-25 06:30:08 UTC
Anoop C S has already RCA'ed the bug. We are working on changes required in init files and systemd unit files to fix in RHEL6 and RHEL7. We will have fix merged for this by end of this week.

Comment 5 Vivek Das 2016-05-10 05:37:35 UTC
[RHEL7] : I am able to crash smbd and produce core dump file of 160MB without getting truncated to 16MB. So rhel7 seemed fine.

[RHEL6] : Even after vdsm work around the core file is not getting dumped in any of the below locations i.e /var/log/core & /var/log/samba/cores/smbd.


Verification on RHEL6 failed.

Comment 6 Vivek Das 2016-05-16 06:15:12 UTC
Verified in RHEL6 & RHEL7 over version samba-client-4.4.3-3.el7rhgs.x86_64 and smbd core dumps are not getting truncated.

Marking it as verified.

Comment 8 errata-xmlrpc 2016-06-23 05:37:30 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.


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