lkml.org 
[lkml]   [2012]   [Feb]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectStack unwind across signal frame
From
I'm seeing a problem on both 2.6.37 and 3.3 MIPS kernels where I can't
unwind through a MIPS signal frame. It looks like this is caused by
the VDSO code that was added 2/2010. When the unwinder tries to find
the frame info for the caller of the signal handler (the trampoline in
VDSO), it can't find the eh_frame info because the address is in the
VDSO area and stops unwinding. It looks like other platforms solve
this by adding the eh_frame info for the VDSO area so the lookup
works.

This problem ends up breaking pthread cleanup for C++ programs because
the cleanup is done using a class with the expectation that the
destructor will be called when the thread gets canceled by a cancel
signal. This seems like a big problem for all current MIPS kernels so
I was wondering if I'm missing something?

If this is correct, then it seems like the best solution would be to
add the VDSO eh_frame info to MIPS.

Thanks
Al Cooper


\
 
 \ /
  Last update: 2012-02-17 22:17    [W:0.043 / U:0.020 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site