On 5/27/22 18:55, Dario Faggioli wrote: > Hello Everyone! > > So, I'm not sure how much this would be interesting, but I thought > about reporting it anyways, then let's see. > > A few days ago we started to build openSUSE_Tumbleweed packages with > -D_FORTIFY_SOURCES=3 by default (it was =2 before, and it's back to =2 > again now, at least for QEMU :-/). > > It seemed fine, but then we discovered that a QEMU built that way, does > not work properly. In fact, it crashes pretty early displaying a > message like this: "*** buffer overflow detected ***"
Hi Dario and all, I just sent a fix to the list, with the Subject "[PATCH] pci: fix overflow in printf string formatting" That should fix the issue, Thanks, Claudio > > I've had a look around, and did not find anything about previous > attempts of doing that, or things to be aware of, in general, if doing > it. > > Now, for now, I don't have many other info myself either. Just some > terminal logs from a few users, and from our automated testing system, > i.e., like this: > > $ sudo virsh start VM1 > error: Failed to start domain 'VM1' > error: internal error: qemu unexpectedly closed the monitor: qxl_send_events: > spice-server bug: guest stopped, ignoring > *** buffer overflow detected ***: terminated > > Or this: > > error: Failed to start domain 'vm-swtpm-legacy' > error: internal error: qemu unexpectedly closed the monitor: > 2022-05-25T16:30:05.738186Z qemu-system-x86_64: -accel kvm: warning: Number > of SMP cpus requested (2) exceeds the recommended cpus supported by KVM (1) > 2022-05-25T16:30:05.738259Z qemu-system-x86_64: -accel kvm: warning: Number > of hotpluggable cpus requested (2) exceeds the recommended cpus supported by > KVM (1) > 2022-05-25T16:30:05.742354Z qemu-system-x86_64: warning: host doesn't support > requested feature: MSR(48FH).vmx-exit-load-perf-global-ctrl [bit 12] > 2022-05-25T16:30:05.742369Z qemu-system-x86_64: warning: host doesn't support > requested feature: MSR(490H).vmx-entry-load-perf-global-ctrl [bit 13] > 2022-05-25T16:30:05.743989Z qemu-system-x86_64: warning: host doesn't support > requested feature: MSR(48FH).vmx-exit-load-perf-global-ctrl [bit 12] > 2022-05-25T16:30:05.744050Z qemu-system-x86_64: warning: host doesn't support > requested feature: MSR(490H).vmx-entry-load-perf-global-ctrl [bit 13] > *** buffer overflow detected ***: terminated > > Or this: > https://openqa.opensuse.org/tests/2375666#step/usr_sbin_dnsmasq/47 > https://xenbits.xen.org/people/dariof/download.png (also here, in case > the image disappears from OpenQA) > > I am planning to try to investigate this more, but not right away. And > I can't even tell for sure when I'll have time for it. So, this is just > for letting people know that this has been (quickly) attempted, and > that it currently does not work, in case it's interesting for anyone > else. > > Of course, in case it's the other way around, i.e., someone already has > more info on the subject that I've not been able to find, feel free to > ping me. :-) > > Thanks and Regards
