Details
Major - P3 Description
One of our automated tests failed because it hit an assertion when running lost connection during test 'test_cursor_random.test_cursor_random.test_cursor_random_deleted_partial(table.sample) in the Python test suite. The original test run was:
http://build.wiredtiger.com:8080/job/wiredtiger-test-coverage/2962
The call stack from the core file is:
(gdb) where
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#0 0x0000003e6ca349c8 in raise () from /lib64/libc.so.6
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#1 0x0000003e6ca3665a in abort () from /lib64/libc.so.6
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#2 0x00007efe3900de33 in __wt_abort () from .libs/libwiredtiger-2.9.2.so
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#3 0x00007efe3907ab44 in __wt_assert () from .libs/libwiredtiger-2.9.2.so
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#4 0x00007efe38f354ee in __tree_walk_internal () from .libs/libwiredtiger-2.9.2.so
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#5 0x00007efe38f35923 in __wt_tree_walk_skip () from .libs/libwiredtiger-2.9.2.so
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#6 0x00007efe38f007e4 in __wt_btcur_next_random () from .libs/libwiredtiger-2.9.2.so
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#7 0x00007efe38f83f45 in __wt_curfile_next_random () from .libs/libwiredtiger-2.9.2.so
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#8 0x00007efe38fb4678 in __curtable_next_random () from .libs/libwiredtiger-2.9.2.so
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#9 0x00007efe393a72fd in _wrap_Cursor_next (self=<optimized out>, args=<optimized out>) at wiredtiger_wrap.c:3887
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The only other thread not waiting on a condition is:
Thread 2 (Thread 0x7efe36768700 (LWP 93680)):
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#0 0x0000003e6cae6e07 in sched_yield () from /lib64/libc.so.6
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#1 0x00007efe3901a6dd in __wt_yield () from .libs/libwiredtiger-2.9.2.so
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#2 0x00007efe3908209d in __wt_writeunlock () from .libs/libwiredtiger-2.9.2.so
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#3 0x00007efe39033956 in __wt_reconcile () from .libs/libwiredtiger-2.9.2.so
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#4 0x00007efe38fc9bae in __evict_review () from .libs/libwiredtiger-2.9.2.so
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#5 0x00007efe38fc848b in __wt_evict () from .libs/libwiredtiger-2.9.2.so
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#6 0x00007efe38fc5687 in __evict_page () from .libs/libwiredtiger-2.9.2.so
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#7 0x00007efe38fc1cb5 in __evict_lru_pages () from .libs/libwiredtiger-2.9.2.so
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#8 0x00007efe38fc0490 in __evict_pass () from .libs/libwiredtiger-2.9.2.so
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#9 0x00007efe38fbf54b in __evict_server () from .libs/libwiredtiger-2.9.2.so
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#10 0x00007efe38fbef77 in __wt_evict_thread_run () from .libs/libwiredtiger-2.9.2.so
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#11 0x00007efe3908c4e8 in __thread_run () from .libs/libwiredtiger-2.9.2.so
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#12 0x0000003e6ce07555 in start_thread () from /lib64/libpthread.so.0
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#13 0x0000003e6cb02ded in clone () from /lib64/libc.so.6
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Since the build doesn't have debug symbols, it's difficult to extract more information. It's likely that the assertion was either:
560 /*
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561 * If restarting from some original position,
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562 * repeat the increment or decrement we made at
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563 * that time. Otherwise, couple is an internal
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564 * page we've acquired after moving from that
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565 * starting position and we can treat it as a
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566 * new page. This works because we never acquire
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567 * a hazard pointer on a leaf page we're not
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568 * going to return to our caller, this will quit
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569 * working if that ever changes.
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570 */
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571 WT_ASSERT(session,
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572 couple == couple_orig ||
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573 WT_PAGE_IS_INTERNAL(couple->page));
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574 ref = couple;
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575 __ref_index_slot(session, ref, &pindex, &slot);
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576 if (couple == couple_orig)
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577 break;
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OR:
348 /* If no page is active, begin a walk from the start/end of the tree. */
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349 if (ref == NULL) {
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350 restart: /*
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351 * We can be here with a NULL or root WT_REF; the page release
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352 * function handles them internally, don't complicate this code
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353 * by calling them out.
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354 */
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355 WT_ERR(__wt_page_release(session, couple, flags));
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356
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357 /*
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358 * We're not supposed to walk trees without root pages. As this
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359 * has not always been the case, assert to debug that change.
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360 */
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361 WT_ASSERT(session, btree->root.page != NULL);
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362
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363 couple = couple_orig = ref = &btree->root;
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364 initial_descent = true;
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365 goto descend;
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366 }
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Though it could also possibly be an assertion that is within an inline function or macro.