Description
This Python test script tries to abort because we're unlocking a lock that was never acquired.
import wiredtiger, wttest
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class test_f(wttest.WiredTigerTestCase):
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# This test drops core.
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def test_f(self):
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uri = "table:xxx"
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self.session.create(uri,
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'key_format=i,value_format=SiS,' +
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'columns=(record,column2,column3,column4),' +
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'colgroups=(cgroup1,cgroup2,cgroup3)')
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cgname = 'colgroup:' + uri.split(":")[1]
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self.session.create(cgname + ':cgroup1', 'columns=(column2)')
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self.session.create(cgname + ':cgroup2', 'columns=(column3)')
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self.session.create(cgname + ':cgroup3', 'columns=(column4)')
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indxname = 'index:' + uri.split(":")[1]
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self.session.create(indxname + ':indx1', 'columns=(column2)')
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self.session.truncate(uri, None, None, None)
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self.session.drop(uri, None)
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if __name__ == '__main__':
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wttest.run()
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The problem is we're not acquiring a lock when opening the btree handle. Here's the stack to get the btree handle:
#0 __wt_session_get_btree (session=0x8030de3d0, uri=0x801012ec0 "file:xxx_indx1.wti", cfg=0x0,
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flags=2) at ../src/session/session_btree.c:178
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WT-1 0x0000000801ec533e in __open_index (session=0x8030de3d0, table=0x800f87600,
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uri=0x800ea7b08 "index:xxx:indx1",
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idxconf=0x8010d5190 "columns=(column2),filename=xxx_indx1.wti")
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at ../src/schema/schema_open.c:172
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WT-2 0x0000000801ec5966 in __wt_schema_open_index (session=0x8030de3d0, table=0x800f87600,
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idxname=0x0, len=0) at ../src/schema/schema_open.c:305
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WT-3 0x0000000801ecbbbb in __truncate_table (session=0x8030de3d0, name=0x8030c117a "xxx")
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at ../src/schema/schema_truncate.c:68
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WT-4 0x0000000801ecbd99 in __wt_schema_truncate (session=0x8030de3d0, uri=0x8030c1174 "table:xxx",
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cfg=0x7fffffffc6a0) at ../src/schema/schema_truncate.c:114
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WT-5 0x0000000801ecd53f in __session_truncate (wt_session=0x8030de3d0,
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uri=0x8030c1174 "table:xxx", start=0x0, stop=0x0, config=0x0)
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at ../src/session/session_api.c:331
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I believe the problem is encapsulated in *open_index: early in the function we call *wt_session_get_btree() but which doesn't lock the btree's rwlock, and then at the end of the function we call __wt_session_release_btree which always attempts to unlock btree->rwlock.