On Fri, Jul 17, 2015 at 7:52 PM, Geoff Winkless <pgsqlad...@geoff.dj> wrote: > While doing some testing of 9.5a one of my colleagues (not on list) found a > reproducible server segfault. > [...] > Hope someone can get something useful from the above. Any questions, please > ask.
A test case is more than enough to look at this issue and guess what is happening, thanks! The issue can be reproduced on REL9_5_STABLE and master, and by looking at the stack trace it seems that the problem is caused by an attempt to delete a memory context that has already been free'd. * thread #1: tid = 0x0000, 0x0000000109f30dee postgres`MemoryContextDelete(context=0x7f7f7f7f7f7f7f7f) + 30 at mcxt.c:206, stop reason = signal SIGSTOP frame #0: 0x0000000109f30dee postgres`MemoryContextDelete(context=0x7f7f7f7f7f7f7f7f) + 30 at mcxt.c:206 203 void 204 MemoryContextDelete(MemoryContext context) 205 { -> 206 AssertArg(MemoryContextIsValid(context)); 207 /* We had better not be deleting TopMemoryContext ... */ 208 Assert(context != TopMemoryContext); 209 /* And not CurrentMemoryContext, either */ (lldb) bt * thread #1: tid = 0x0000, 0x0000000109f30dee postgres`MemoryContextDelete(context=0x7f7f7f7f7f7f7f7f) + 30 at mcxt.c:206, stop reason = signal SIGSTOP * frame #0: 0x0000000109f30dee postgres`MemoryContextDelete(context=0x7f7f7f7f7f7f7f7f) + 30 at mcxt.c:206 frame #1: 0x0000000109b7e261 postgres`fmgr_sql(fcinfo=0x00007f84c28d5870) + 433 at functions.c:1044 I am adding it to the list of Open Items for 9.5. I'll look into that in the next couple of days (Tuesday at worst). Regards, -- Michael -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers