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From: Paul F. <pj...@wa...> - 2020-02-15 13:07:43
|
Only on amd64 atm == 641 tests, 186 stderr failures, 17 stdout failures, 8 stderrB failures, 14 stdoutB failures, 2 post failures == Much better than I expected. There were 4 or 5 hangs in pipe reads. A+ Paul |
|
From: Paul F. <pj...@wa...> - 2020-02-15 08:00:50
|
> On 10 Feb 2020, at 21:35, Paul FLOYD <pj...@wa...> wrote: > > Hi > > The main problem that I have at the moment is that readelf and co aren't redirecting any allocation functions like malloc and free. > OK, after some quite lengthy debugging I’m starting to see what is happening. Here’s my understanding of what is going on. When an executable file gets mmaped this will trigger calls to VG_(redirects_notify_new_DebugInfo) and generate_and_add_actives. The Specs that get read get added to the head of topSpecs and DebugInfos get added to the head of debugInfo_list. vgpreload_memcheck gets loaded first, so that the function/so patterns are added to topSpecs. Then when libc.so/libstdc++.so are loaded, the soname and function names match and the Active gets inserted into activeSet. This is the basis for redirection later. Winding back a bit, in di_notify_ACHIEVE_ACCEPT_STATE there is a call to discard_DebugInfos_which_overlap_with. This is where things are going wrong on FreeBSD. On Linux, the DebugInfos do not overlap, except when comparing a di with itself, for which there is a check and the flag gets cleared. On FreeBSD I’m seeing overlaps - there are repeated values of avma/size. These are for ro DebugInfoMappings. If I add a check that both mappings are not ro then at least for my trivial examples things seem to be working. A+ Paul |