On Wed, 6 Apr 2022 at 20:26, Nick Desaulniers <ndesaulniers@xxxxxxxxxx> wrote: > > On Wed, Apr 6, 2022 at 10:33 AM Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > > > On 4/6/22 18:20, syzbot wrote: > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: 3e732ebf7316 Merge tag 'for_linus' of git://git.kernel.org.. > > > git tree: upstream > > > console output: https://syzkaller.appspot.com/x/log.txt?x=10ca0687700000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=eba855fbe3373b4f > > > dashboard link: https://syzkaller.appspot.com/bug?extid=6b36bab98e240873fd5a > > > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > Reported-by: syzbot+6b36bab98e240873fd5a@xxxxxxxxxxxxxxxxxxxxxxxxx > > > > > > arch/x86/kvm/emulate.c:3332:5: error: stack frame size (2552) exceeds limit (2048) in function 'emulator_task_switch' [-Werror,-Wframe-larger-than] > > > drivers/block/loop.c:1524:12: error: stack frame size (2648) exceeds limit (2048) in function 'lo_ioctl' [-Werror,-Wframe-larger-than] > > > > I spot-checked these two and the stack frame is just 144 and 320 bytes > > respectively on a normal compile. This is probably just the effect of > > some of the sanitizer options. > > Yep. > $ wget -q https://syzkaller.appspot.com/x/.config\?x\=eba855fbe3373b4f > -O - | grep CONFIG_KASAN=y > CONFIG_KASAN=y > https://github.com/ClangBuiltLinux/linux/issues/39 (our oldest still-open issue) The issue is due to: commit b9080ba4a6ec56447f263082825a4fddb873316b Date: Wed Mar 23 12:21:10 2022 +0100 x86/defconfig: Enable WERROR Marco has disabled it in syzbot configs: https://github.com/google/syzkaller/commit/53c67432e69b0df4ff64448b944cbffaecec20f4 #syz invalid
