Bug 234300

Summary: smbfs slab corruption
Product: Red Hat Enterprise Linux 4 Reporter: Vasily Averin <vvs>
Component: kernelAssignee: Jeff Layton <jlayton>
Status: CLOSED ERRATA QA Contact: Martin Jenner <mjenner>
Severity: medium Docs Contact:
Priority: medium    
Version: 4.4CC: khorenko, staubach, steved
Target Milestone: ---   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: RHBA-2007-0791 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2007-11-15 16:24:01 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
this patch is missed hunk in linux-2.6.9-smbfs-uid-gid.patch, sets the default files and dir permission
none
patch from mainstream, fixes smbfs slab corruption none

Description Vasily Averin 2007-03-28 11:20:26 UTC 
There is known issue that "mount -t smbfs" without dmask and fmask slleps on the
30 sec and produced the following messages:

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=168280
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=202934

I've investigated the reasons of these messages and found that on the
RHEL4-based kernel with SLAB_DEBUG enabled this test shows the slab corruption:

init_special_inode: bogus i_mode (0)
smb_retry: no connection process
smb_add_request: request [000001000bd22d38, mid=1802201963] timed out!
smb_delete_inode: could not close inode 2
Slab corruption: start=000001000bd22d38, len=344
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<ffffffffa00ba56d>](smb_add_request+0x42d/0x4d0 [smbfs])
010: 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
150: 02 00 58 00 fb ff ff ff
Prev obj: start=000001000bd22bc8, len=344
Redzone: 0x5a2cf071/0x5a2cf071.
Last user: [<0000000000000000>](0x0)
000: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
010: 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
Comment 1 Vasily Averin 2007-03-28 11:20:27 UTC 
Created attachment 151106 [details]
this patch is missed hunk in linux-2.6.9-smbfs-uid-gid.patch, sets the default files and dir permission
Comment 2 Vasily Averin 2007-03-28 11:23:42 UTC 
Created attachment 151109 [details]
patch from mainstream, fixes smbfs slab corruption

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=48564e628bd7662d7a0b3ac81c41cd0e4cc36dae
Comment 3 Vasily Averin 2007-03-28 11:29:51 UTC 
It was reproduced on the 2.6.9-42.0.10.EL kernel
Comment 4 Jeff Layton 2007-05-11 15:14:02 UTC 
Thanks for the patches and for doing the legwork to track down a reproducer!

I've attached the patch in comment #1 to BZ 168280 and will plan to propose it
for that BZ. I've also confirmed that the patch in comment #2 fixes the slab
corruption, so I'll plan propose that one to fix this BZ.
Comment 6 RHEL Program Management 2007-05-11 20:41:43 UTC 
This request was evaluated by Red Hat Kernel Team for inclusion in a Red
Hat Enterprise Linux maintenance release, and has moved to bugzilla 
status POST.
Comment 7 Jason Baron 2007-06-22 14:29:53 UTC 
committed in stream U6 build 55.11. A test kernel with this patch is available
from http://people.redhat.com/~jbaron/rhel4/
Comment 10 errata-xmlrpc 2007-11-15 16:24:01 UTC 
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0791.html