More bjam crashes

From: Beman Dawes (bdawes_at_[hidden])
Date: 2003-08-11 07:33:57

bjam release build (VC++ 7.1) crashed again on Saturday's Win32 regression 
tests. A rerun using a debug VC++ 7.1 build also crashed. See attached 
debug information.

This was the first time I had gotten a crash on a pure debug build, so I 
spent some time in the debugger looking at what had happened. Basically, it 
looks to like the string pointer argument to string_free() got somehow 
trashed before it was passed to assert_invariants(). Since the call to 
assert_invariants() is the first statement in string_free(), it seemed to 
me the stack had become corrupted.

I tried a build explicitly specifying the stack size as 2 megabytes (the 
default is 1 megabyte) but that also crashed.

I tried a build using Metrowerks CodeWarrior 8.3, and that ran without 
problems.

Sunday, the first try was with the CW build, and it failed several minutes 
into the actual compiles. Switched back to the VC++ build, which ran the 
regressions without problems.

Monday, using the VC++ build, the failure reappeared. I reran as two 
separate runs with four toolsets each, and that was OK.

It seems that higher workload is a common denominator with these failures. 
They never occur if few dependencies change and only one or two toolsets 
are in use. They sometimes occur if a lot of dependencies have changed *or* 
a lot (say 8) of toolsets are in use. They often occur when many 
dependencies have changed *and* a lot of toolsets are in use.

--Beman
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