On Fri, Dec 18, 2020 at 8:47 PM Kees Cook <keesc...@chromium.org> wrote: > > On Thu, Dec 17, 2020 at 11:38:30AM +0100, Dmitry Vyukov wrote: > > On Thu, Dec 17, 2020 at 11:14 AM syzbot > > <syzbot+73d662376f16e2a73...@syzkaller.appspotmail.com> wrote: > > > > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: accefff5 Merge tag 'arm-soc-omap-genpd-5.11' of > > > git://git... > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=14567b7f500000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=1e6efc730c219bd4 > > > dashboard link: > > > https://syzkaller.appspot.com/bug?extid=73d662376f16e2a7336d > > > compiler: clang version 11.0.0 > > > (https://github.com/llvm/llvm-project.git > > > ca2dcbd030eadbf0aa9b660efe864ff08af6e18b) > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the > > > commit: > > > Reported-by: syzbot+73d662376f16e2a73...@syzkaller.appspotmail.com > > > > +Kees > > > > Not sure if it's related to UBSAN or not, but we didn't used to get > > empty stack traces. > > Either way syzbot can't boot the upstream kernel anymore. > > _none_ of them? :( > > Are you able to see which UBSAN config is tweaking this?
It seems that so far this is triggered only only 1 instances and that instance is the only one that uses clang: https://syzkaller.appspot.com/upstream There is some difference in config between clang/gcc instances, but I don't see anything obvious that mentions null pointers: failing clang instance: CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y CONFIG_UBSAN=y # CONFIG_UBSAN_TRAP is not set CONFIG_CC_HAS_UBSAN_BOUNDS=y CONFIG_CC_HAS_UBSAN_ARRAY_BOUNDS=y CONFIG_UBSAN_BOUNDS=y CONFIG_UBSAN_ARRAY_BOUNDS=y CONFIG_UBSAN_SHIFT=y # CONFIG_UBSAN_DIV_ZERO is not set CONFIG_UBSAN_SIGNED_OVERFLOW=y # CONFIG_UBSAN_UNSIGNED_OVERFLOW is not set CONFIG_UBSAN_OBJECT_SIZE=y CONFIG_UBSAN_BOOL=y CONFIG_UBSAN_ENUM=y # CONFIG_UBSAN_ALIGNMENT is not set CONFIG_UBSAN_SANITIZE_ALL=y # CONFIG_TEST_UBSAN is not set working gcc instance: CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y CONFIG_UBSAN=y # CONFIG_UBSAN_TRAP is not set CONFIG_CC_HAS_UBSAN_BOUNDS=y CONFIG_UBSAN_BOUNDS=y CONFIG_UBSAN_ONLY_BOUNDS=y CONFIG_UBSAN_SHIFT=y # CONFIG_UBSAN_DIV_ZERO is not set CONFIG_UBSAN_SIGNED_OVERFLOW=y CONFIG_UBSAN_BOOL=y CONFIG_UBSAN_ENUM=y # CONFIG_UBSAN_ALIGNMENT is not set CONFIG_UBSAN_SANITIZE_ALL=y # CONFIG_TEST_UBSAN is not set
