Bug 804156 - libssh2 fails key re-exchange when write channel is saturated
libssh2 fails key re-exchange when write channel is saturated
Product: Fedora
Classification: Fedora
Component: libssh2 (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
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Assigned To: Paul Howarth
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-03-16 13:01 EDT by Matthew Booth
Modified: 2012-03-21 14:43 EDT (History)
3 users (show)

See Also:
Fixed In Version: libssh2-1.4.0-2.fc17
Doc Type: Bug Fix
Doc Text:
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Clone Of: 804145
Last Closed: 2012-03-21 14:43:03 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Matthew Booth 2012-03-16 13:01:35 EDT
+++ This bug was initially created as a clone of Bug #804145 +++

Description of problem:
This bug is fixed upstream:

It's a blocker for virt-p2v. virt-p2v sends a large amount of data over ssh using libssh2. When it has sent enough data (about 64G), the peer will request key re-exchange. Because virt-p2v sends data continuously, it will hit this bug with almost 100% reliability, making it impossible to transfer more than 64G of data.

Version-Release number of selected component (if applicable):

--- Additional comment from mbooth@redhat.com on 2012-03-16 12:08:23 EDT ---

Created attachment 570649 [details]
Patch to openssh to aid testing

It takes about 45-60 mins of sending data on my system to hit this bug. I'm using a version of openssh with this patch to aid testing. It causes openssh to force a rekey 32x sooner than normal.

--- Additional comment from mbooth@redhat.com on 2012-03-16 12:43:26 EDT ---

Created attachment 570652 [details]
Backport of upstream fix

This is a backport of upstream commit cc4f9d5679278ce41cd5480fab3f5e71dba163ed. The backport was uncomplicated: code has shifted a bit, but nothing close to the affected lines has been altered.

--- Additional comment from mbooth@redhat.com on 2012-03-16 12:54:28 EDT ---

Created attachment 570653 [details]
Backport of upstream fix (V2)

Spoke too soon! libssh2_kex_exchange was renamed to _libssh2_kex_exchange, so the above doesn't compile. This version is fixed.
Comment 1 Fedora Update System 2012-03-16 18:00:59 EDT
libssh2-1.4.0-2.fc17 has been submitted as an update for Fedora 17.
Comment 2 Fedora Update System 2012-03-17 12:51:20 EDT
Package libssh2-1.4.0-2.fc17:
* should fix your issue,
* was pushed to the Fedora 17 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing libssh2-1.4.0-2.fc17'
as soon as you are able to.
Please go to the following url:
then log in and leave karma (feedback).
Comment 3 Fedora Update System 2012-03-21 14:43:03 EDT
libssh2-1.4.0-2.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

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