Bug #57761 strict alias violation in DataBuffer::seize() causes ndbd to crash with gcc4.5.1

• Submitted: 27 Oct 2010 6:35
• Modified: 27 Oct 2010 9:09
• Reporter: Jonas Oreland
• Status: Closed
• Category: MySQL Cluster: Cluster (NDB) storage engine
• Severity: S3 (Non-critical)
• OS: Any
• Assigned to: Jonas Oreland
• CPU Architecture: Any

[27 Oct 2010 6:35] Jonas Oreland

Description:
code in DataBuffer::seize() exploits fact that
offsetof(Segment, nextPool) == 0 and cast a Uint32 to Segment*

How to repeat:
try starting ndbd compiled with gcc4.5.1 -O3

Suggested fix:
cleanup code

[27 Oct 2010 6:38] Bugs System

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/122005

3323 Jonas Oreland	2010-10-27
      ndb - bug#57761 - fix strict alias violation in DataBuffer::seize()

[27 Oct 2010 6:42] Bugs System

Pushed into mysql-5.1-telco-6.3 5.1.51-ndb-6.3.39 (revid:[e-mail]-20101027063500-2vte8pekf0i8f1oe) (version source revid:[e-mail]-20101027063500-2vte8pekf0i8f1oe) (merge vers: 5.1.51-ndb-6.3.39) (pib:21)

[27 Oct 2010 6:48] Bugs System

Pushed into mysql-5.1-telco-7.0 5.1.51-ndb-7.0.20 (revid:[e-mail]-20101027064529-u2mq7ktcs5pqakla) (version source revid:[e-mail]-20101027064529-u2mq7ktcs5pqakla) (merge vers: 5.1.51-ndb-7.0.20) (pib:21)

[27 Oct 2010 6:59] Jonas Oreland

pushed to 6.3.39, 7.0.20 and 7.1.9

DOCS: Prior to this fix, ndbd crashed during startup if compiled with gcc >= 4.5

[27 Oct 2010 9:09] Jon Stephens

Documented as follows in the NDB-6.3.39, 7.0.20, and 7.1.9 changelogs:

      Data nodes compiled with gcc 4.5 or higher crashed during 
      startup.

Closed.