Description
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)):
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#0 0x00000000100b44a8 in __wt_atomic_subiv32 (vp=0x1000427ef38, v=1)
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at ../src/include/gcc.h:138
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#1 0x00000000100b576c in __wt_txn_update_oldest (session=0x1000428e120,
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force=true) at ../src/txn/txn.c:336
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#2 0x0000000010040a14 in __evict_review (session=0x1000428e120,
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ref=0x10005411740, inmem_splitp=0x3fff29ffd110, closing=false)
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at ../src/evict/evict_page.c:423
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#3 0x000000001003f7dc in __wt_evict (session=0x1000428e120,
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ref=0x10005411740, closing=false) at ../src/evict/evict_page.c:81
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#4 0x000000001003dd9c in __evict_page (session=0x1000428e120, is_server=false)
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at ../src/evict/evict_lru.c:1650
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#5 0x000000001003e0c0 in __wt_cache_eviction_worker (session=0x1000428e120,
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busy=false, pct_full=96) at ../src/evict/evict_lru.c:1729
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#6 0x0000000010184690 in __wt_cache_eviction_check (session=0x1000428e120,
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busy=false, didworkp=0x0) at ../src/include/cache.i:253
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#7 0x0000000010184c58 in __wt_txn_idle_cache_check (session=0x1000428e120)
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at ../src/include/txn.i:312
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#8 0x00000000101863d8 in __cursor_func_init (cbt=0x3fff6803d640, reenter=true)
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at ../src/include/cursor.i:263
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#9 0x0000000010187d8c in __wt_btcur_insert (cbt=0x3fff6803d640)
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at ../src/btree/bt_cursor.c:519
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#10 0x000000001012f0b8 in __curfile_insert (cursor=0x3fff6803d640)
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at ../src/cursor/cur_file.c:245
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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.
Attachments
Issue Links
- 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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