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qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 10/18/19 5:41 PM, Fernando Casas Sch=C3=B6ssow wrote: > Hi, >=20 Hi! Thanks for the report. > Today while working with two different Windows Server 2012 R2 guests I=20 > found that when I try to attach an ISO file to a SCSI CD-ROM device=20 > through libvirt (virsh or virt-manager) while the guest is running,=20 > qemu crashes and the following message is logged: >=20 > Assertion failed: blk_get_aio_context(d->conf.blk) =3D=3D s->ctx=20 > (/home/buildozer/aports/main/qemu/src/qemu-4.0.0/hw/scsi/virtio-scsi.c:= =20 > virtio_scsi_ctx_check: 246) >=20 > I can repro this at will. All I have to do is to try to attach an ISO=20 > file to the SCSI CDROM while the guest is running. > The SCSI controller model is virtio-scsi with iothread enabled. > Please find below all the details about my setup that I considered=20 > relevant but I missed something please don't hesitate to let me know: >=20 Looks like we got aio_context management wrong with iothread for the media change events somewhere. Should be easy enough to fix if we figure out where the bad assumption is. > Host arch: x86_64 > Distro: Alpine Linux 3.10.2 > qemu version: 4.0 Do you have the ability to try 4.1, or the latest development head with debugging symbols enabled? > Linux kernel version: 4.19.67 > libvirt: 5.5.0 > Emulated SCSI controller: virtio-scsi (with iothread enabled) > Guest firmware: OVMF-EFI > Guest OS: Window Server 2012 R2 > Guest virtio drivers version: 171 (current stable) >=20 > qemu command line: >=20 > /usr/bin/qemu-system-x86_64 -name guest=3DDCHOMENET01,debug-threads=3Don = -S=20 > -object=20 > secret,id=3DmasterKey0,format=3Draw,file=3D/var/lib/libvirt/qemu/domain-7= 8-DCHOMENET01/master-key.aes=20 > -machine pc-i440fx-4.0,accel=3Dkvm,usb=3Doff,dump-guest-core=3Don -cpu=20 > IvyBridge,ss=3Don,vmx=3Doff,pcid=3Don,hypervisor=3Don,arat=3Don,tsc_adjus= t=3Don,umip=3Don,xsaveopt=3Don,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=3D0= x1fff=20 > -drive=20 > file=3D/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd,if=3Dpflash,for= mat=3Draw,unit=3D0,readonly=3Don=20 > -drive=20 > file=3D/var/lib/libvirt/qemu/nvram/DCHOMENET01_VARS.fd,if=3Dpflash,format= =3Draw,unit=3D1=20 > -m 1536 -overcommit mem-lock=3Doff -smp 1,sockets=3D1,cores=3D1,threads= =3D1=20 > -object iothread,id=3Diothread1 -uuid=20 > f06978ad-2734-44ab-a518-5dfcf71d625e -no-user-config -nodefaults=20 > -chardev socket,id=3Dcharmonitor,fd=3D33,server,nowait -mon=20 > chardev=3Dcharmonitor,id=3Dmonitor,mode=3Dcontrol -rtc=20 > base=3Dlocaltime,driftfix=3Dslew -global kvm-pit.lost_tick_policy=3Ddelay= =20 > -no-hpet -no-shutdown -global PIIX4_PM.disable_s3=3D1 -global=20 > PIIX4_PM.disable_s4=3D1 -boot strict=3Don -device=20 > qemu-xhci,id=3Dusb,bus=3Dpci.0,addr=3D0x4 -device=20 > virtio-scsi-pci,iothread=3Diothread1,id=3Dscsi0,num_queues=3D1,bus=3Dpci.= 0,addr=3D0x5=20 > -device virtio-serial-pci,id=3Dvirtio-serial0,bus=3Dpci.0,addr=3D0x6 -dri= ve=20 > file=3D/storage/storage-hdd-vms/virtual_machines_hdd/dchomenet01.qcow2,fo= rmat=3Dqcow2,if=3Dnone,id=3Ddrive-scsi0-0-0-0,cache=3Dnone,discard=3Dunmap,= aio=3Dthreads=20 > -device=20 > scsi-hd,bus=3Dscsi0.0,channel=3D0,scsi-id=3D0,lun=3D0,device_id=3Ddrive-s= csi0-0-0-0,drive=3Ddrive-scsi0-0-0-0,id=3Dscsi0-0-0-0,bootindex=3D1,write-c= ache=3Don=20 > -drive if=3Dnone,id=3Ddrive-scsi0-0-0-1,readonly=3Don -device=20 > scsi-cd,bus=3Dscsi0.0,channel=3D0,scsi-id=3D0,lun=3D1,device_id=3Ddrive-s= csi0-0-0-1,drive=3Ddrive-scsi0-0-0-1,id=3Dscsi0-0-0-1=20 > -netdev tap,fd=3D41,id=3Dhostnet0,vhost=3Don,vhostfd=3D43 -device=20 > virtio-net-pci,netdev=3Dhostnet0,id=3Dnet0,mac=3D52:54:00:99:b5:62,bus=3D= pci.0,addr=3D0x3=20 > -chardev=20 > socket,id=3Dcharserial0,host=3D127.0.0.1,port=3D4900,telnet,server,nowait= =20 > -device isa-serial,chardev=3Dcharserial0,id=3Dserial0 -chardev=20 > spicevmc,id=3Dcharchannel0,name=3Dvdagent -device=20 > virtserialport,bus=3Dvirtio-serial0.0,nr=3D1,chardev=3Dcharchannel0,id=3D= channel0,name=3Dcom.redhat.spice.0=20 > -chardev socket,id=3Dcharchannel1,fd=3D45,server,nowait -device=20 > virtserialport,bus=3Dvirtio-serial0.0,nr=3D2,chardev=3Dcharchannel1,id=3D= channel1,name=3Dorg.qemu.guest_agent.0=20 > -chardev spiceport,id=3Dcharchannel2,name=3Dorg.spice-space.webdav.0=20 > -device=20 > virtserialport,bus=3Dvirtio-serial0.0,nr=3D3,chardev=3Dcharchannel2,id=3D= channel2,name=3Dorg.spice-space.webdav.0=20 > -device virtio-tablet-pci,id=3Dinput2,bus=3Dpci.0,addr=3D0x7 -spice=20 > port=3D5900,addr=3D127.0.0.1,disable-ticketing,seamless-migration=3Don=20 > -device=20 > qxl-vga,id=3Dvideo0,ram_size=3D67108864,vram_size=3D67108864,vram64_size_= mb=3D0,vgamem_mb=3D16,max_outputs=3D1,bus=3Dpci.0,addr=3D0x2=20 > -chardev spicevmc,id=3Dcharredir0,name=3Dusbredir -device=20 > usb-redir,chardev=3Dcharredir0,id=3Dredir0,bus=3Dusb.0,port=3D2 -chardev= =20 > spicevmc,id=3Dcharredir1,name=3Dusbredir -device=20 > usb-redir,chardev=3Dcharredir1,id=3Dredir1,bus=3Dusb.0,port=3D3 -device= =20 > virtio-balloon-pci,id=3Dballoon0,bus=3Dpci.0,addr=3D0x8 -sandbox=20 > on,obsolete=3Ddeny,elevateprivileges=3Ddeny,spawn=3Ddeny,resourcecontrol= =3Ddeny=20 > -msg timestamp=3Don >=20 > I can provide a core dump of the process if needed for debugging and=20 > the guest XML as well. >=20 A backtrace is probably a great starting point (from gdb: `thread apply all bt`.) I don't know exactly what codepath is being exercised when you "attach an ISO file" through libvirt's interface. If you don't mind the hassle, trying on the 4.1 (or a development build would be even more luxurious) and giving a stacktrace would be nice. > Thanks. >=20 > Fernando >=20 >=20 Thanks! --js