Could you try the attached patch against a 3.4.y kernel? It works like
this:
0. prerequisites:
apt-get install git build-essential
1. get the kernel history, if you don't already have it:
git clone \
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git
2. grab point releases:
cd linux
git remote add stable \
https://kernel.googlesource.com/pub/scm/linux/kernel/git/stable/linux-stable
git fetch stable
3. configure, build, test:
git checkout stable/linux-3.4.y
cp /boot/config-$(uname -r) .config; # current configuration
make localmodconfig; # optional: minimize configuration
scripts/config --disable DEBUG_INFO
make deb-pkg; # optionally with -j<num> for parallel build
dpkg -i ../<name of package>; # as root
reboot
... test test test ...
Hopefully it reproduces the bug. So