MySQL Bugs: #52880: Node crash when index dropped during read with debug compile

Bug #52880	Node crash when index dropped during read with debug compile
Submitted:	16 Apr 2010 8:06	Modified:	11 May 2021 20:41
Reporter:	Magnus Blåudd	Email Updates:
Status:	Won't fix	Impact on me:	None
Category:	MySQL Cluster: Cluster (NDB) storage engine	Severity:	S1 (Critical)
Version:	mysql-5.1-telco-7.0	OS:	Any
Assigned to:	Assigned Account	CPU Architecture:	Any
Tags:	7.0.13

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Description:
The testcase for bug#50118 causes node crash when run with debug compiled  binaries(#define ARRAY_GUARD). It appears like reads are allowed to continue on the index table when it's being dropped and in Dbtc::readIndexTable a speculative "c_theIndexes.getPtr(<index table id>)" is performed causing  the ARRAY_GUARD to be activated.

Reproduced on both Windows and Linux.

How to repeat:
$> ./mtr ndb_basic --start
$> test/ndbapi/testIndex -n Bug50118 T1

Suggested fix:
Pass flag to 'getPtr' indicating that the element might not be seized.