There is a hang in test/format on Jenkins. The stack traces indicate that nearly all 34 threads are in __wt_txn_update_oldest, and they have passed the force flag in. Call stack similar to:
Thread 4 (Thread 0x3fff29fff1b0 (LWP 22019)): #0 0x00000000100b44a8 in __wt_atomic_subiv32 (vp=0x1000427ef38, v=1) at ../src/include/gcc.h:138 #1 0x00000000100b576c in __wt_txn_update_oldest (session=0x1000428e120, force=true) at ../src/txn/txn.c:336 #2 0x0000000010040a14 in __evict_review (session=0x1000428e120, ref=0x10005411740, inmem_splitp=0x3fff29ffd110, closing=false) at ../src/evict/evict_page.c:423 #3 0x000000001003f7dc in __wt_evict (session=0x1000428e120, ref=0x10005411740, closing=false) at ../src/evict/evict_page.c:81 #4 0x000000001003dd9c in __evict_page (session=0x1000428e120, is_server=false) at ../src/evict/evict_lru.c:1650 #5 0x000000001003e0c0 in __wt_cache_eviction_worker (session=0x1000428e120, busy=false, pct_full=96) at ../src/evict/evict_lru.c:1729 #6 0x0000000010184690 in __wt_cache_eviction_check (session=0x1000428e120, busy=false, didworkp=0x0) at ../src/include/cache.i:253 #7 0x0000000010184c58 in __wt_txn_idle_cache_check (session=0x1000428e120) at ../src/include/txn.i:312 #8 0x00000000101863d8 in __cursor_func_init (cbt=0x3fff6803d640, reenter=true) at ../src/include/cursor.i:263 #9 0x0000000010187d8c in __wt_btcur_insert (cbt=0x3fff6803d640) at ../src/btree/bt_cursor.c:519 #10 0x000000001012f0b8 in __curfile_insert (cursor=0x3fff6803d640) at ../src/cursor/cur_file.c:245
Reviewing the code in __wt_txn_update_oldest, if the scan_count never gets to zero, none of the threads will ever be able to update the oldest read generation, so we can get into a state where all threads spin trying and failing to update the oldest ID.
- depends on
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WT-2566 All lock operations should be barriers
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- Closed
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- is duplicated by
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- Closed
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- Closed
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- Closed
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