On 03/28/2018 03:54 PM, Nicolas Thauvin wrote: > Hello, > > A customer sent us a core dump of the crash of the background worker of > the powa extension, running on 9.6.8 along side with cstore_fdw. > > The background worker loops on a plpgsql function, which then execute > another plpgsql function that issues the query "TRUNCATE > powa_statements_history_current". > > Here is the backtrace : > > ... > > The core shows that ProcessUtility hook of cstore_fdw produces a > segfault when trying to copy the relation list of the truncate > statement plan. > > In frame 2: > (gdb) p *((TruncateStmt *)parseTree) > $26 = {type = T_TruncateStmt, relations = 0x2f106a8, restart_seqs = 0 '\000', > behavior = DROP_RESTRICT} > (gdb) p *(((TruncateStmt *)parseTree)->relations) > $27 = {type = 49574520, length = 0, head = 0x0, tail = 0x2faaab8} > > With this invalid list, standard_ProcessUtility would not have failed > but the relation would not have been truncated. > > ... > > Could you please give me some pointers to further investigate this > crash? >
Sounds like a bug in CStoreProcessUtility, which is part of cstore_fdw, not PostgreSQL. So I guess the right place to report the issue is https://github.com/citusdata/cstore_fdw regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services