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Bug 596989 - no response for operation on rhel3 during dd
Summary: no response for operation on rhel3 during dd
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: glibc
Version: 6.0
Hardware: All
OS: Linux
Target Milestone: rc
: ---
Assignee: Andreas Schwab
QA Contact: qe-baseos-tools
Depends On:
TreeView+ depends on / blocked
Reported: 2010-05-27 21:13 UTC by Glauber Costa
Modified: 2016-11-24 15:56 UTC (History)
11 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of: 555649
Last Closed: 2010-06-23 14:35:04 UTC
Target Upstream Version:

Attachments (Terms of Use)

Comment 2 RHEL Product and Program Management 2010-05-28 11:55:27 UTC
This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for

Comment 3 Glauber Costa 2010-06-21 18:31:10 UTC
Okay. I've been able to track it down to an unexplainable buggy return from preadv. Also, I checked what the kernel was doing and... it wasn't doing anything.

Searching on the archives, shows that rjones already hit a similar issue. He managed to circumvent it for libguestfs, but here, we should really have it fixed.

We have two options:
1) use the kernel preadv/pwritev directly, but the last time it was raised in qemu, it got more or less of a nack ( and I disagree as well)
2) poke hard to get it fixed for RHEL6.

for now, I am changing this bug to libc.

Comment 4 Glauber Costa 2010-06-22 14:55:29 UTC
Note this is the same bug as described in rawhide's #563103

Comment 6 Glauber Costa 2010-06-23 14:35:04 UTC
Ok, not an issue in RHEL6, just tested.
My system was a mixture of some upstream components, with RHEL6 versions of the virtualization stack pieces.

As glibc maintainer kindly told me, RHEL6 glibc's just calls the kernel. Testing in a pure RHEL6 system did not show the problem.

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