Sue LoVerso added a comment - Oct 07 2015 03:31:28 PM +00:00 The command being executed is ./t -t m -n 1000000 -k 5000000 -C cache_size=100MB . The stack is: (gdb) bt #0 0x00000000004840e2 in __wt_off_page (page=0x7f7704162350, p=0x7f7714e8b02a) at ../src/include/btree.i:470 #1 0x0000000000484b69 in __wt_free_ref (session=0x1f02f70, page=0x7f7704162350, ref=0x7f7704162310, free_pages=false) at ../src/btree/bt_discard.c:251 #2 0x0000000000484ca2 in __wt_free_ref_index (session=0x1f02f70, page=0x7f7704162350, pindex=0x7f770405abb0, free_pages=false) at ../src/btree/bt_discard.c:279 #3 0x0000000000484a94 in __free_page_int (session=0x1f02f70, page=0x7f7704162350) at ../src/btree/bt_discard.c:212 #4 0x000000000048469c in __wt_page_out (session=0x1f02f70, pagep=0x7f77041621d0) at ../src/btree/bt_discard.c:116 #5 0x0000000000484437 in __wt_ref_out (session=0x1f02f70, ref=0x7f77041621d0) at ../src/btree/bt_discard.c:32 #6 0x0000000000423501 in __wt_evict_page_clean_update (session=0x1f02f70, ref=0x7f77041621d0, closing=true) at ../src/evict/evict_page.c:166 #7 0x00000000004d4c12 in __wt_evict_file (session=0x1f02f70, syncop=4) at ../src/evict/evict_file.c:94 #8 0x00000000004a1451 in __wt_cache_op (session=0x1f02f70, ckptbase=0x0, op=4) at ../src/btree/bt_sync.c:262 #9 0x0000000000474b24 in __wt_checkpoint_close (session=0x1f02f70, final=true) at ../src/txn/txn_ckpt.c:1189 #10 0x00000000004b7be2 in __wt_conn_btree_sync_and_close (session=0x1f02f70, final=true, force=false) at ../src/conn/conn_dhandle.c:198 #11 0x00000000004b8ccf in __wt_conn_dhandle_discard_single (session=0x1f02f70, final=true, force=false) at ../src/conn/conn_dhandle.c:635 #12 0x00000000004b8fbe in __wt_conn_dhandle_discard (session=0x1f02f70) at ../src/conn/conn_dhandle.c:696 #13 0x0000000000411f6d in __wt_connection_close (conn=0x1ef1400) at ../src/conn/conn_open.c:127 #14 0x000000000040884b in __conn_close (wt_conn=0x1ef1400, config=0x0) at ../src/conn/conn_api.c:1005 #15 0x00000000004046b4 in wt_shutdown () at ../../../test/checkpoint/test_checkpoint.c:230 #16 0x0000000000404540 in main (argc=0, argv=0x7fff944a9388) at ../../../test/checkpoint/test_checkpoint.c:173 And the reason for the bus error is that the page->dsk address is invalid. (The p address is also invalid since it is just beyond page->dsk , but the code below doesn't actually try to dereference it.) (gdb) list 465 * There may be no underlying page, in which case the reference is 466 * off-page by definition. 467 */ 468 return (page->dsk == NULL || 469 p < (void *)page->dsk || 470 p >= (void *)((uint8_t *)page->dsk + page->dsk->mem_size)); 471 } (gdb) p p $1 = (const void *) 0x7f7714e8b02a (gdb) x/x *(uint8_t*)p Cannot access memory at address 0x7f7714e8b02a (gdb) p *page $2 = {u = {intl = {recno = 0, parent_ref = 0x7f77041621d0, __index = 0x7f770405abb0, deepen_split_append = 0, deepen_split_last = 0}, row = {ins = 0x0, upd = 0x7f77041621d0, d = 0x7f770405abb0, entries = 0}, col_fix = {recno = 0, bitf = 0x7f77041621d0 "", entries = 67480496}, col_var = {recno = 0, d = 0x7f77041621d0, repeats = 0x7f770405abb0, nrepeats = 0, entries = 0}}, type = 6 '\006', flags_atomic = 4 '\004', read_gen = 0, page_lock = {u = {lock = 0, s = {owner = 0, waiter = 0}}}, memory_footprint = 12920, dsk = 0x7f7714e8b000, modify = 0x0} (gdb) p *page->dsk Cannot access memory at address 0x7f7714e8b000