Ubuntu
glibc package

  1. Bug #1247026
  2. Comment #15

Comment 15 for bug 1247026

Revision history for this message
In , Ishikawa-yk (ishikawa-yk) wrote :

Created attachment 82043
A temporary bandage fix to ignore strlen() redirection for amd86 linux architecture

By applying the patch, I could run valgrind on Debian GNU/Linux amd64 64bits) version.
The patch basically disable's the request for catching the call to the native strlen()
and monitor it with valgrind's internal version.

Julian, it seems that, at least on Debian GNU/Linux amd64, valgrind does not bomb out even if strlen is not traced by memcheck. After all, gcc-4.8 which I use to compile mozilla's thunderbird seems to replace all calls to strlen() with an inlined version and so there is no loss (and no gain) by not redirecting the call to strlen().

People's mileage may vary depending on
 - the OS version
 - the versions of the library (especially /lib64/ld-2.17.so, /lib/ld-n.nn.so,
  and friends.), and
 - the compiler used.

I have patched 3.9.0 SVN version (obtained by svn command from the repository) and compiled it myself using the patch.

Now that valgrind can run without having to change libc (which I was not so sure how to do easily) on my Debian GNU/Linux amd64, I have to figure out though why the following command results in crashing thunderbird :
BAD: valgrind --trace-children=yes --smc-check=all-non-file --gen-suppressions=all --track-origins=yes --read-var-info=yes --malloc-fill=0xA5 --free-fill=0xC3 --leak-check=full --num-callers=50 --suppressions=$HOME/TB-NEW/TB-3HG/new-src/mozilla/build/valgrind/cross-architecture.sup --suppressions=$HOME/TB-NEW/TB-3HG/new-src/mozilla/build/valgrind/i386-redhat-linux-gnu.sup --suppressions=$HOME/Dropbox/myown.sup --show-possibly-lost=no /REF-OBJ-DIR/objdir-tb3/mozilla/dist/bin/thunderbird-bin

while the following command run thunderbird successfully
GOOD:
 valgrind --read-var-info=yes --trace-children=yes --smc-check=all-non-file --malloc-fill=0xA5 --free-fill=0xC3 --leak-check=full --num-callers=50 --suppressions=$HOME/TB-NEW/TB-3HG/new-src/mozilla/build/valgrind/cross-architecture.sup --suppressions=$HOME/TB-NEW/TB-3HG/new-src/mozilla/build/valgrind/i386-redhat-linux-gnu.sup --suppressions=$HOME/Dropbox/myown.sup --show-possibly-lost=no /REF-OBJ-DIR/objdir-tb3/mozilla/dist/bin/thunderbird-bin

Note the addition of --gen-suppression=all on the BAD command line. It seems that
valgrind itself is crashing, but the stacktrace shown is that of thunderbird (but without proper symbolic trace.) I will file a separate entry after more investigation.

TIA