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ITS#7970 LMDB: Critical Heisenbug

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Inconsistent reading & SIGSEGV due to the race condition.
This commit is contained in:
leo@yuriev.ru 2014-10-17 22:35:41 +00:00 committed by Hallvard Furuseth
parent 1e5d79831c
commit 8230b1b630
1 changed files with 4 additions and 1 deletions
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5
libraries/liblmdb/mdb.c
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@ -2539,7 +2539,10 @@ mdb_txn_renew0(MDB_txn *txn)
return rc;
}
}
txn->mt_txnid = r->mr_txnid = ti->mti_txnid;
do /* LY: Retry on a race, ITS#7970. */
r->mr_txnid = ti->mti_txnid;
while(r->mr_txnid != ti->mti_txnid);
txn->mt_txnid = r->mr_txnid;
txn->mt_u.reader = r;
meta = env->me_metas[txn->mt_txnid & 1];
}