On 2 Feb 2012, at 18:02, Duncan Rance wrote: > > At last I have been able to reproduce this problem in a relatively simple > (yet contrived) way.
Doh! Should have mentioned this already, but in case a Sparc is not available, the latest on the debugging is as follows: As well as the bus error, I also saw the same symptom as described in BUG #6200. I changed the four places that did an elog ERROR "invalid memory alloc request size" to PANIC instead and got a raft of core files. I have not dug any further as yet, but at the following function on the stack: char * text_to_cstring(const text *t) The values t and tunpacked are the same, so pg_detoast_datum_packed() did not modify t. And len comes out as -4. A couple of bits from dbx: (dbx) print -fx t->vl_len_[0] t->vl_len_[0] = 0xffffff84 (dbx) examine tunpacked /2x 0x0000010000ceb9dc: 0x8474 0x776f Going to have a look further up the stack now. Cheers, Dunc
