Hi, Am 30.03.2014 22:27, schrieb Cole Robinson: > With git master, loadvm hits an assert failure if using ehci and usb tablet. > Steps to reproduce: > > $ qemu-img create -f qcow2 foo.qcow2 10G > $ ./x86_64-softmmu/qemu-system-x86_64 \ > -enable-kvm -m 4096 \ > -device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7 \ > -device > ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5 > \ > -device ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1 \ > -device ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2 \ > -device usb-tablet,id=input0 \ > -hda foo.qcow2 \ > -cdrom Fedora-20-x86_64-Live-Desktop.iso \ > -boot d -monitor stdio > > <wait until guest boot to 'welcome to fedora' window> > (qemu) savevm foo > (qemu) loadvm foo > qemu-system-x86_64: hw/pci/pci.c:250: pcibus_reset: Assertion > `bus->irq_count[i] == 0' failed. > > The relevant backtrace bits for the assertion: > > #4 0x00007f8f7241971e in pcibus_reset (qbus=0x7f8f74082fd0) > at hw/pci/pci.c:250 > #5 0x00007f8f723bd36d in qbus_reset_one (bus=0x7f8f74082fd0, > opaque=<optimized out>) at hw/core/qdev.c:249 > #6 0x00007f8f723bec88 in qdev_walk_children (dev=0x7f8f73efb320, > pre_devfn=0x0, pre_busfn=0x0, post_devfn=0x7f8f723bf4f0 <qdev_reset_one>, > post_busfn=0x7f8f723bd320 <qbus_reset_one>, opaque=0x0) > at hw/core/qdev.c:403 > #7 0x00007f8f723bedb8 in qbus_walk_children (bus=0x7f8f740706e0, > pre_devfn=0x0, pre_busfn=0x0, post_devfn=0x7f8f723bf4f0 <qdev_reset_one>, > post_busfn=0x7f8f723bd320 <qbus_reset_one>, opaque=0x0) > at hw/core/qdev.c:369 > #8 0x00007f8f724f5c5d in qemu_devices_reset () at vl.c:1867 > #9 qemu_system_reset (report=report@entry=false) at vl.c:1880 > #10 0x00007f8f7256dba2 in load_vmstate (name=name@entry=0x7f8f7417a160 "foo") > at /home/crobinso/src/qemu/savevm.c:1098 > > The 'cause' is this: > > #0 ehci_detach (port=0x555556436968) at hw/usb/hcd-ehci.c:810 > #1 0x0000555555727b5e in usb_detach (port=port@entry=0x555556436968) > at hw/usb/core.c:49 > #2 0x0000555555736bf3 in ehci_reset (opaque=0x5555564364d8) > at hw/usb/hcd-ehci.c:941 > #3 0x00005555557e1fcd in qemu_devices_reset () at vl.c:1867 > #4 qemu_system_reset (report=report@entry=false) at vl.c:1880 > #5 0x0000555555859f12 in load_vmstate (name=name@entry=0x555556458210 "foo") > at /home/crobinso/src/qemu/savevm.c:1098 > > ehci_reset calls usb_detach which sets pcibus->irq_count[3] = 1. pcibus_reset > runs and hits the assertion. But I don't understand this stuff enough to > determine what's actually wrong here :) > > I bisected the issue to: > > commit 31b030d4abc5bea89c2b33b39d3b302836f6b6ee > Author: Andreas Färber <afaer...@suse.de> > Date: Wed Sep 4 01:29:02 2013 +0200 > > cputlb: Change tlb_flush_page() argument to CPUState > > Signed-off-by: Andreas Färber <afaer...@suse.de> > > ...and then I double checked it since that sounds unrelated. Same result.
You are running into an unrelated migration bug: http://git.qemu.org/?p=qemu.git;a=commit;h=c01a71c1a56fa27f43449ff59e5d03b2483658a2 Sorry about that. You'll need to patch -p1 the above commit on top of each git-bisect commit to find the actual breakage if the above commit is already bad (can't test right now). Cheers, Andreas -- SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer; HRB 16746 AG Nürnberg
