[Valgrind-users] Address 0xFFFFE034 is not stack'd, malloc'd or free'd

[bert h. <ah...@ds...>]

Dear valgrind heroes,

When working on spamproxy (an open source tool to deflect spam in innovative
ways) and throwing an exception from a thread on Linux 2.6.0-test7, g++
3.3.2, libc-2.3.2, debian sid, I get the following:

==4259== Thread 3:
==4259== Invalid read of size 4
==4259==    at 0x403A5B50: (within /lib/libgcc_s.so.1)
==4259==    by 0x404AFB36: __dl_iterate_phdr (dl-iteratephdr.c:43)
==4259==    by 0x403A5EE4: _Unwind_Find_FDE (in /lib/libgcc_s.so.1)
==4259==    by 0x403A3A24: (within /lib/libgcc_s.so.1)
==4259==    Address 0xFFFFE034 is not stack'd, malloc'd or free'd
==4259== 
==4259== Thread 3:
==4259== Invalid read of size 4
==4259==    at 0x403A5E28: (within /lib/libgcc_s.so.1)
==4259==    by 0x404AFB36: __dl_iterate_phdr (dl-iteratephdr.c:43)
==4259==    by 0x403A5EE4: _Unwind_Find_FDE (in /lib/libgcc_s.so.1)
==4259==    by 0x403A3A24: (within /lib/libgcc_s.so.1)
==4259==    Address 0xFFFFE03C is not stack'd, malloc'd or free'd

Now, these addresses look remarkably like the vsyscall page, but I don't
know. 

I'm wondering if this is something I have to worry about. Unwind_Find_FDE is
related to throwing exceptions.

Code is at http://ds9a.nl/tmp/sproxy-0.1.tar.bz2 , you can trigger this by
connecting to port 2500 and disconnecting immediately.

Suggested spamproxy.conf:

real-smtp-server=127.0.0.1
real-smtp-port=25
outgoing-address=127.0.0.1
listen-address=127.0.0.1
listen-port=2500

Thanks!

-- 
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