On 21 March 2016 at 10:05, Markus Armbruster <arm...@redhat.com> wrote: > Peter Maydell <peter.mayd...@linaro.org> writes: >> Also some new clang ubsan warnings on x86 Linux: >> GTESTER check-qtest-i386 >> [deleted existing warnings about slirp code] >> /home/petmay01/linaro/qemu-for-merges/hw/pci/pci.c:166:23: runtime >> error: shift exponent -1 is negative >> /home/petmay01/linaro/qemu-for-merges/hw/pci/pci.c:171:24: runtime >> error: shift exponent -1 is negative >> /home/petmay01/linaro/qemu-for-merges/hw/pci/pci.c:172:24: runtime >> error: shift exponent -1 is negative > > Stack backtrace? If it's not too much trouble...
Sorry, too painful -- this version of clang doesn't support the UBSAN_OPTIONS environment variable to request a backtrace at runtime and I can't remember the rune to connect gdb to the qemu under a qtest test, which is what I'd need to do if I rebuilt everything with the trap-on-error flag. The issues are all provoked by the i386/ivshmem/single test. thanks -- PMM
