Server crashes while unwinding changes in an autonomous transaction
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Key: CORE-3979
URL: http://tracker.firebirdsql.org/browse/CORE-3979
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.2
Reporter: Dmitry Yemanov
A part of the backtrace:
#1 pop (this=0x2aab64991a48, tdbb=0x2aab0897ea40, request=0x2aab60059bd0)
at
../src/dsql/../dsql/../dsql/../dsql/../jrd/../jrd/../jrd/../common/classes/stack.h:146
tmp = <value optimized out>
#2 Jrd::InAutonomousTransactionNode::execute (this=0x2aab64991a48,
tdbb=0x2aab0897ea40, request=0x2aab60059bd0)
at ../src/dsql/StmtNodes.cpp:265
savNumber = 0x2aab6005eb70
transaction = 0x2aab76e4dca8
#3 0x00002aca82bdc936 in EXE_looper (tdbb=0x2aab0897ea40,
request=0x2aab60059bd0, in_node=0x2aab6498fd18) at ../src/jrd/exe.cpp:2798
which_erase_trig = 0
which_sto_trig = 0
which_mod_trig = 0
top_node = 0x0
transaction = 0x2aab76e4dca8
dbb = 0x2aaaf7c9edf8
old_pool = 0x2aaaf80b52c0
context = {<Firebird::ContextPoolHolder> = {
savedPool = 0x2aaaf80b52c0}, savedThreadData = 0x2aab0897ea40,
savedPool = 0x2aaaf80b52c0}
old_request = 0x0
old_transaction = 0x2aab76e4dca8
save_point_number = 66
node = 0x2aab60059df0
error_pending = true
catch_disabled = true
result = 0x2aab0897ea40
#4 0x00002aca82be0ee0 in execute_looper (tdbb=0x2aab0897ea40,
request=0x2aab60059bd0, transaction=0x2aab76e4dca8, next_state=req_sync)
at ../src/jrd/exe.cpp:1410
dbb = 0x2aaaf7c9edf8
A quick look shows that execute(req_unwind) is called twice for the same node
and during the second iteration req_auto_trans is already empty, causing a NULL
pointer dereference failure.
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