Re: [Qemu-devel] [QEMU 2.1.2] block in bdrv_drain_all()

[Fam Zheng]

On Tue, 12/01 17:53, Qian Peng wrote:
> Hi,
> 
> 
>   I am using qemu 2.1.2 and some VMs hang while playing videos.

Does the problem reproduce with current head?

Fam

> 
> 
> QEMU parameters and stack information is as follows:
> /usr/bin/qemu-system-x86_64 
> -name S398_ABC-047 
> -S -machine pc-i440fx-2.1,accel=kvm,usb=off 
> -m 1024 
> -realtime mlock=off 
> -smp 1,sockets=1,cores=1,threads=1 
> -uuid 2f9fa97a-0061-436c-a40c-e7abc3d0cdb1 
> -no-user-config -nodefaults 
> -chardev 
> socket,id=charmonitor,path=/var/lib/libvirt/qemu/S398_ABC-047.monitor,server,nowait
>  
> -mon chardev=charmonitor,id=monitor,mode=control 
> -rtc base=localtime 
> -no-shutdown -global PIIX4_PM.disable_s3=1 
> -global PIIX4_PM.disable_s4=0 -boot strict=on 
> -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 
> -device virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x5 
> -drive 
> file=/opt/cvm/win7_64_S398_ABC-047.inst,if=none,id=drive-ide0-0-0,format=qcow2,cache=writeback,discard=unmap
>  
> -device ide-hd,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0,bootindex=1 
> -drive 
> file=/opt/data/hugedisk/win7_64_S398_ABC-047_share.add,if=none,id=drive-ide0-0-1,format=qcow2,cache=writeback
>  
> -device ide-hd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1 -netdev 
> tap,fd=21,id=hostnet0,vhost=on,vhostfd=23 
> -device 
> virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:19:a6:93,bus=pci.0,addr=0x3
>  -chardev pty,id=charserial0 
> -device isa-serial,chardev=charserial0,id=serial0 -chardev pty,id=charserial1 
> -device isa-serial,chardev=charserial1,id=serial1 -chardev 
> spicevmc,id=charchannel0,name=vdagent 
> -device 
> virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
>  -chardev spiceport,id=charchannel1,name=webcam 
> -device 
> virtserialport,bus=virtio-serial0.0,nr=2,chardev=charchannel1,id=channel1,name=com.redhat.spice.webcam
>  
> -device usb-tablet,id=input0 -spice 
> port=5902,addr=0.0.0.0,disable-ticketing,seamless-migration=on -vnc 0.0.0.0:3 
> -device 
> qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,bus=pci.0,addr=0x2 
> -device intel-hda,id=sound0,bus=pci.0,addr=0x4 
> -device hda-micro,id=sound0-codec0,bus=sound0.0,cad=0 -device 
> hda-duplex,id=sound0-codec1,bus=sound0.0,cad=1 
> -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x6 
> -readconfig /etc/qemu/ich9-ehci-uhci.cfg 
> -chardev spicevmc,name=usbredir,id=usbredirchardev1 -device 
> usb-redir,chardev=usbredirchardev1,id=usbredirdev1,bus=ehci.0 
> -chardev spicevmc,name=usbredir,id=usbredirchardev2 -device 
> usb-redir,chardev=usbredirchardev2,id=usbredirdev2,bus=ehci.0 
> -chardev spicevmc,name=usbredir,id=usbredirchardev3 -device 
> usb-redir,chardev=usbredirchardev3,id=usbredirdev3,bus=ehci.0 
> -cpu SandyBridge,host=on,+vmx,model_id=Intel(R) Xeon(R) CPU E5-26xx 
> series,hv-relaxed=on,hv-time=on,hv-spinlocks=0x1fff 
> 
> 
> Thread 4 (Thread 0x7fa09a527700 (LWP 48069)):
> #0  0x00007fa09ec7b3e7 in ppoll () from /lib64/libc.so.6
> #1  0x00007fa0a2f7e27b in qemu_poll_ns (fds=<value optimized out>,
>     nfds=<value optimized out>, timeout=<value optimized out>)
> #2  0x00007fa0a2f7edf4 in aio_poll (ctx=0x7fa0a5835620, blocking=true)
> #3  0x00007fa0a2f782e8 in bdrv_drain_all ()
> #4  0x00007fa0a2eb602a in bmdma_cmd_writeb (bm=0x7fa0a5ce8cc8, val=0)
> #5  0x00007fa0a2d17e68 in access_with_adjusted_size (addr=0,
>     value=0x7fa09a526aa0, size=1, access_size_min=<value optimized out>,
>     access_size_max=<value optimized out>,
>     access=0x7fa0a2d19b10 <memory_region_write_accessor>, mr=0x7fa0a5ce8e30)
> #6  0x00007fa0a2d1988c in memory_region_dispatch_write (mr=0x7fa0a5ce8e30,
>     addr=0, val=<value optimized out>, size=1)
> #7  io_mem_write (mr=0x7fa0a5ce8e30, addr=0, val=<value optimized out>, 
> size=1)
> #8  0x00007fa0a2cdd73a in address_space_rw (as=0x7fa0a3412380,
>     addr=<value optimized out>, buf=<value optimized out>, len=1,
>     is_write=true)
> #9  0x00007fa0a2d155c4 in kvm_handle_io (cpu=<value optimized out>)
> #10 kvm_cpu_exec (cpu=<value optimized out>)
> #11 0x00007fa0a2d0470c in qemu_kvm_cpu_thread_fn (arg=0x7fa0a5ca95c0)
> #12 0x00007fa0a17ec9d1 in start_thread () from /lib64/libpthread.so.0
> #13 0x00007fa09ec849dd in clone () from /lib64/libc.so.6
> 
> 
> Thread 3 (Thread 0x7fa0995ff700 (LWP 48071)):
> #0  0x00007fa09ec7b1b3 in poll () from /lib64/libc.so.6
> #1  0x00007fa09fbfb306 in ?? () from /usr/lib64/libspice-server.so.1
> #2  0x00007fa0a17ec9d1 in start_thread () from /lib64/libpthread.so.0
> #3  0x00007fa09ec849dd in clone () from /lib64/libc.so.6
> 
> 
> Thread 2 (Thread 0x7fa098bff700 (LWP 48072)):
> #0  0x00007fa0a17f05bc in pthread_cond_wait@@GLIBC_2.3.2 ()
>    from /lib64/libpthread.so.0
> #1  0x00007fa0a2fca499 in qemu_cond_wait (cond=<value optimized out>,
>     mutex=<value optimized out>)
> #2  0x00007fa0a2f6c9d3 in vnc_worker_thread_loop (queue=0x7fa0a5e62170)
> #3  0x00007fa0a2f6cf80 in vnc_worker_thread (arg=0x7fa0a5e62170)
> #4  0x00007fa0a17ec9d1 in start_thread () from /lib64/libpthread.so.0
> #5  0x00007fa09ec849dd in clone () from /lib64/libc.so.6
> 
> 
> Thread 1 (Thread 0x7fa0a2c1d9c0 (LWP 48065)):
> #0  0x00007fa0a17f3264 in __lll_lock_wait () from /lib64/libpthread.so.0
> #1  0x00007fa0a17ee508 in _L_lock_854 () from /lib64/libpthread.so.0
> #2  0x00007fa0a17ee3d7 in pthread_mutex_lock () from /lib64/libpthread.so.0
> #3  0x00007fa0a2fca719 in qemu_mutex_lock (mutex=<value optimized out>)
> #4  0x00007fa0a2f7cedb in os_host_main_loop_wait (
>     nonblocking=<value optimized out>)
> #5  main_loop_wait (nonblocking=<value optimized out>)
> #6  0x00007fa0a2df9aeb in main_loop (argc=<value optimized out>,
>     argv=<value optimized out>, envp=<value optimized out>)
> #7  main (argc=<value optimized out>, argv=<value optimized out>,
>     envp=<value optimized out>)
> 
> 
> Did anyone meet this problem before? If I want to fix it, which patches I 
> could apply.
> 
> 
> Thank you very much!
> 
> 
> Regards,
> Qian Peng