Control: notforwarded -1
Control: reassign -1 src:linux 4.8.7-1
Control: affects -1 src:openldap
Hi debian-kernel,
There seems to be a regression on powerpc64 (both endians) that can
corrupt the vector-scalar registers (VSRs) in a threaded program.
I believe the bad commit is this one:
4.9.0:
https://github.com/torvalds/linux/commit/dc16b553c949e81f37555777dc7bab66d78285a7
4.8.6:
https://github.com/linux-stable/linux-stable/commit/613036d9e91990f2043130ff8f78fd770432b3de
My program is not using transactional memory itself, but I don't
know what libc/libpthread might do internally.
4.8.7-1 is the first Debian kernel where I observe the crash. I rebuilt
that package with the above commit reverted and it went away.
The crash still occurs with 4.11.6-1 from unstable. I have not tested
anything more recent.
I still need to work up a reduced test case. For now the steps to
reproduce the crash with the openldap package are:
apt-get build-dep openldap
apt-get source openldap
cd openldap-*/
DEB_BUILD_OPTIONS=nocheck dpkg-buildpackage -T build
cd debian/build/tests
./run -b bdb test060-mt-hot
Thanks
Ryan
