Server crashes while accessing context variables concurrently
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Key: CORE-4616
URL: http://tracker.firebirdsql.org/browse/CORE-4616
Project: Firebird Core
Issue Type: Bug
Components: Engine
Affects Versions: 2.5.3, 2.5.2 Update 1, 2.5.2
Reporter: Dmitry Yemanov
Crash happens when one thread executes RDB$SET_CONTEXT:
fb_inet_server!set_context
fb_inet_server!CALL_UDF<long>
fb_inet_server!invoke
fb_inet_server!FUN_evaluate
fb_inet_server!EVL_expr
fb_inet_server!EXE_assignment
fb_inet_server!EXE_looper
fb_inet_server!looper_seh
fb_inet_server!execute_looper
fb_inet_server!EXE_start
fb_inet_server!execute_triggers
fb_inet_server!EXE_execute_db_triggers
fb_inet_server!JRD_start_multiple
fb_inet_server!jrd8_start_transaction
and another one retrieves the list of context variables due to the MON$ table
request:
fb_inet_server!Jrd::DatabaseSnapshot::putContextVars+0xc3
fb_inet_server!Jrd::DatabaseSnapshot::dumpData+0x128
fb_inet_server!Jrd::DatabaseSnapshot::blockingAst+0x9c
fb_inet_server!Jrd::LockManager::blocking_action+0x134
fb_inet_server!Jrd::LockManager::signal_owner+0x37
fb_inet_server!Jrd::LockManager::post_blockage+0x1b4
fb_inet_server!Jrd::LockManager::wait_for_request+0x3d9
fb_inet_server!Jrd::LockManager::grant_or_que+0x8c
fb_inet_server!Jrd::LockManager::enqueue+0x20e
fb_inet_server!enqueue+0x51
fb_inet_server!LCK_lock+0x8f
fb_inet_server!LCK_lock_opt+0x36
fb_inet_server!lock_buffer+0xdb
fb_inet_server!CCH_fetch_lock+0x132
fb_inet_server!CCH_fetch+0x2d
fb_inet_server!DPM_gen_id+0x152
Bug is caused by the lack of proper synchronization inside RDB$SET_CONTEXT.
v2.1 and v3 are not affected.
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