Re: [Qemu-devel] qemu 2.2 crash on linux hvm domU (full backtrace included)

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Il 19/11/2014 15:56, Don Slutz ha scritto:
I think I know what is happening here. But you are pointing at the wrong change. 

commit 9b23cfb76b3a5e9eb5cc899eaf2f46bc46d33ba4
Is what I am guessing at this time is the issue. I think that xen_enabled() is returning false in pc_machine_initfn. Where as in pc_init1 is is returning true. 

I am thinking that:


diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 7bb97a4..3268c29 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -914,7 +914,7 @@ static QEMUMachine xenfv_machine = {
     .desc = "Xen Fully-virtualized PC",
     .init = pc_xen_hvm_init,
     .max_cpus = HVM_MAX_VCPUS,
-    .default_machine_opts = "accel=xen",
+    .default_machine_opts = "accel=xen,vmport=off",
     .hot_add_cpu = pc_hot_add_cpu,
 };
 #endif

Will fix your issue. I have not tested this yet.
Tested now and it solves regression of linux hvm domUs with qemu 2.2, thanks. I think that I'm not the only with this regression and that this patch (or a fix to the cause in vmport) should be applied before qemu 2.2 final. 



    -Don Slutz


On 11/19/14 09:04, Fabio Fantoni wrote:

Il 14/11/2014 12:25, Fabio Fantoni ha scritto:
dom0 xen-unstable from staging git with "x86/hvm: Extend HVM cpuid leaf with vcpu id" and "x86/hvm: Add per-vcpu evtchn upcalls" patches, and qemu 2.2 from spice git (spice/next commit e779fa0a715530311e6f59fc8adb0f6eca914a89): 
https://github.com/Fantu/Xen/commits/rebase/m2r-staging
I tried with qemu tag v2.2.0-rc2 and crash still happen, here the full backtrace of latest test: 
Program received signal SIGSEGV, Segmentation fault.
0x0000555555689b07 in vmport_ioport_read (opaque=0x5555564443a0, addr=0, 
    size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/hw/misc/vmport.c:73
73          eax = env->regs[R_EAX];
(gdb) bt full
#0 0x0000555555689b07 in vmport_ioport_read (opaque=0x5555564443a0, addr=0, 
    size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/hw/misc/vmport.c:73
        s = 0x5555564443a0
        cs = 0x0
        cpu = 0x0
        __func__ = "vmport_ioport_read"
        env = 0x8250
        command = 0 '\000'
        eax = 0
#1 0x0000555555655fc4 in memory_region_read_accessor (mr=0x555556444428, 
    addr=0, value=0x7fffffffd8d0, size=4, shift=0, mask=4294967295)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:410
        tmp = 0
#2  0x00005555556562b7 in access_with_adjusted_size (addr=0,
    value=0x7fffffffd8d0, size=4, access_size_min=4, access_size_max=4,
access=0x555555655f62 <memory_region_read_accessor>, mr=0x555556444428) 
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:480
        access_mask = 4294967295
        access_size = 4
        i = 0
#3 0x00005555556590e9 in memory_region_dispatch_read1 (mr=0x555556444428, 
    addr=0, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1077
        data = 0
#4 0x00005555556591b1 in memory_region_dispatch_read (mr=0x555556444428, 
    addr=0, pval=0x7fffffffd9a8, size=4)
---Type <return> to continue, or q <return> to quit---
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1099
No locals.
#5  0x000055555565cbbc in io_mem_read (mr=0x555556444428, addr=0,
    pval=0x7fffffffd9a8, size=4)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1962
No locals.
#6 0x000055555560a1ca in address_space_rw (as=0x555555eaf920, addr=22104, 
    buf=0x7fffffffda50 "\377\377\377\377", len=4, is_write=false)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/exec.c:2167
        l = 4
        ptr = 0x555555a92d87 "%s/%d:\n"
        val = 7852232130387826944
        addr1 = 0
        mr = 0x555556444428
        error = false
#7 0x000055555560a38f in address_space_read (as=0x555555eaf920, addr=22104, 
    buf=0x7fffffffda50 "\377\377\377\377", len=4)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/exec.c:2205
No locals.
#8  0x000055555564fd4b in cpu_inl (addr=22104)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/ioport.c:117
        buf = "\377\377\377\377"
        val = 21845
#9  0x0000555555670c73 in do_inp (addr=22104, size=4)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:684
---Type <return> to continue, or q <return> to quit---
No locals.
#10 0x0000555555670ee0 in cpu_ioreq_pio (req=0x7ffff7ff3020)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:747
        i = 1
#11 0x00005555556714b3 in handle_ioreq (state=0x5555563c2510,
req=0x7ffff7ff3020) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:853 
No locals.
#12 0x0000555555671826 in cpu_handle_ioreq (opaque=0x5555563c2510)
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:931
        state = 0x5555563c2510
        req = 0x7ffff7ff3020
#13 0x000055555596e240 in qemu_iohandler_poll (pollfds=0x555556389a30, ret=1) 
    at iohandler.c:143
        revents = 1
        pioh = 0x5555563f7610
        ioh = 0x555556450a40
#14 0x000055555596de1c in main_loop_wait (nonblocking=0) at main-loop.c:495 
        ret = 1
        timeout = 4294967295
        timeout_ns = 3965432
#15 0x0000555555756d3f in main_loop () at vl.c:1882
        nonblocking = false
        last_io = 0
#16 0x000055555575ea49 in main (argc=62, argv=0x7fffffffe048,
    envp=0x7fffffffe240) at vl.c:4400
---Type <return> to continue, or q <return> to quit---
        i = 128
        snapshot = 0
        linux_boot = 0
        initrd_filename = 0x0
        kernel_filename = 0x0
        kernel_cmdline = 0x555555a48f86 ""
        boot_order = 0x555556387460 "dc"
        ds = 0x5555564b2040
        cyls = 0
        heads = 0
        secs = 0
        translation = 0
        hda_opts = 0x0
        opts = 0x5555563873b0
        machine_opts = 0x555556389010
        icount_opts = 0x0
        olist = 0x555555e57e80
        optind = 62
optarg = 0x7fffffffe914 "file=/mnt/vm/disks/FEDORA19.disk1.xm,if=ide,index=0,media=disk,format=raw,cache=writeback" 
        loadvm = 0x0
        machine_class = 0x55555637d5c0
        cpu_model = 0x0
        vga_model = 0x0
        qtest_chrdev = 0x0
---Type <return> to continue, or q <return> to quit---
        qtest_log = 0x0
        pid_file = 0x0
        incoming = 0x0
        show_vnc_port = 0
        defconfig = true
        userconfig = true
        log_mask = 0x0
        log_file = 0x0
        mem_trace = {malloc = 0x55555575a402 <malloc_and_trace>,
          realloc = 0x55555575a45a <realloc_and_trace>,
free = 0x55555575a4c1 <free_and_trace>, calloc = 0, try_malloc = 0, 
          try_realloc = 0}
        trace_events = 0x0
        trace_file = 0x0
        default_ram_size = 134217728
        maxram_size = 2130706432
        ram_slots = 0
        vmstate_dump_file = 0x0
        main_loop_err = 0x0
        __func__ = "main"


I take a fast look in source based on calltrace and I saw this commit:
http://git.qemu.org/?p=qemu.git;a=commit;h=37f9e258b64b3cf97c7c78df60660100c9eb5a21 
xen-hvm.c: Add support for Xen access to vmport
Can be the cause of regression and I must try another test reverting this commit or is not related? 

Thanks for any reply anddo sorry for my bad english.
Qemu crash on fedora 20 lxde (with software updates of some days ago) boot with this backtrace: 
Program received signal SIGSEGV, Segmentation fault.
0x0000555555689607 in vmport_ioport_read (opaque=0x555556440a20, addr=0, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/hw/misc/vmport.c:73 
73          eax = env->regs[R_EAX];
(gdb) bt full
#0 0x0000555555689607 in vmport_ioport_read (opaque=0x555556440a20, addr=0, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/hw/misc/vmport.c:73 
        s = 0x555556440a20
        cs = 0x0
        cpu = 0x0
        __func__ = "vmport_ioport_read"
        env = 0x8250
        command = 0 '\000'
        eax = 0
#1 0x0000555555655b9c in memory_region_read_accessor (mr=0x555556440aa8, addr=0, value=0x7fffffffd8c0, size=4, shift=0, mask=4294967295) 
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:410
        tmp = 0
#2 0x0000555555655e8f in access_with_adjusted_size (addr=0, value=0x7fffffffd8c0, size=4, access_size_min=4, access_size_max=4, access=0x555555655b3a <memory_region_read_accessor>, mr=0x555556440aa8) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:480 
        access_mask = 4294967295
        access_size = 4
        i = 0
#3 0x0000555555658cc1 in memory_region_dispatch_read1 (mr=0x555556440aa8, addr=0, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1077 
        data = 0
#4 0x0000555555658d89 in memory_region_dispatch_read (mr=0x555556440aa8, addr=0, pval=0x7fffffffd998, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1099 
No locals.
#5 0x000055555565c794 in io_mem_read (mr=0x555556440aa8, addr=0, pval=0x7fffffffd998, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/memory.c:1962 
No locals.
#6 0x0000555555609fae in address_space_rw (as=0x555555eae840, addr=22104, buf=0x7fffffffda40 "\377\377\377\377", len=4, is_write=false) 
    at /mnt/vm/xen/Xen/tools/qemu-xen-dir/exec.c:2169
        l = 4
        ptr = 0x0
        val = 7964229952888770560
        addr1 = 0
        mr = 0x555556440aa8
        error = false
#7 0x000055555560a173 in address_space_read (as=0x555555eae840, addr=22104, buf=0x7fffffffda40 "\377\377\377\377", len=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/exec.c:2207 
No locals.
#8 0x000055555564fac7 in cpu_inl (addr=22104) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/ioport.c:117 
        buf = "\377\377\377\377"
        val = 21845
#9 0x000055555567084b in do_inp (addr=22104, size=4) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:684 
No locals.
#10 0x0000555555670ab8 in cpu_ioreq_pio (req=0x7ffff7ff3000) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:747 
        i = 0
#11 0x000055555567108b in handle_ioreq (state=0x5555563c1590, req=0x7ffff7ff3000) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:853 
---Type <return> to continue, or q <return> to quit---
No locals.
#12 0x00005555556713fe in cpu_handle_ioreq (opaque=0x5555563c1590) at /mnt/vm/xen/Xen/tools/qemu-xen-dir/xen-hvm.c:931 
        state = 0x5555563c1590
        req = 0x7ffff7ff3000
#13 0x000055555596d874 in qemu_iohandler_poll (pollfds=0x555556388a30, ret=1) at iohandler.c:143 
        revents = 1
        pioh = 0x5555563f3c90
        ioh = 0x555556515f80
#14 0x000055555596d450 in main_loop_wait (nonblocking=0) at main-loop.c:495 
        ret = 1
        timeout = 4294967295
        timeout_ns = 3418165
#15 0x00005555557567b7 in main_loop () at vl.c:1882
        nonblocking = false
        last_io = 1
#16 0x000055555575e4c1 in main (argc=62, argv=0x7fffffffe038, envp=0x7fffffffe230) at vl.c:4400 
        i = 128
        snapshot = 0
        linux_boot = 0
        initrd_filename = 0x0
        kernel_filename = 0x0
        kernel_cmdline = 0x555555a485c6 ""
        boot_order = 0x5555563864e0 "dc"
        ds = 0x5555564c71b0
        cyls = 0
        heads = 0
        secs = 0
        translation = 0
        hda_opts = 0x0
        opts = 0x555556386430
        machine_opts = 0x555556388090
        icount_opts = 0x0
        olist = 0x555555e56da0
        optind = 62
optarg = 0x7fffffffe914 "file=/mnt/vm/disks/FEDORA19.disk1.xm,if=ide,index=0,media=disk,format=raw,cache=writeback" 
        loadvm = 0x0
        machine_class = 0x55555637c5c0
        cpu_model = 0x0
        vga_model = 0x0
        qtest_chrdev = 0x0
---Type <return> to continue, or q <return> to quit---
        qtest_log = 0x0
        pid_file = 0x0
        incoming = 0x0
        show_vnc_port = 0
        defconfig = true
        userconfig = true
        log_mask = 0x0
        log_file = 0x0
mem_trace = {malloc = 0x555555759e7a <malloc_and_trace>, realloc = 0x555555759ed2 <realloc_and_trace>, free = 0x555555759f39 <free_and_trace>, calloc = 0, 
          try_malloc = 0, try_realloc = 0}
        trace_events = 0x0
        trace_file = 0x0
        default_ram_size = 134217728
        maxram_size = 2013265920
        ram_slots = 0
        vmstate_dump_file = 0x0
        main_loop_err = 0x0
        __func__ = "main"




xl -vvv create /etc/xen/FEDORA19.cfg
Parsing config from /etc/xen/FEDORA19.cfg
libxl: debug: libxl_create.c:1529:do_domain_create: ao 0xac2660: create: how=(nil) callback=(nil) poller=0xac2af0 libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=unknown libxl: debug: libxl_device.c:215:disk_try_backend: Disk vdev=hda, backend phy unsuitable as phys path not a block device libxl: debug: libxl_device.c:298:libxl__device_disk_set_backend: Disk vdev=hda, using backend qdisk libxl: debug: libxl_create.c:935:initiate_domain_create: running bootloader libxl: debug: libxl_bootloader.c:323:libxl__bootloader_run: not a PV domain, skipping bootloader libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac32f8: deregister unregistered 
xc: detail: elf_parse_binary: phdr: paddr=0x100000 memsz=0x26b324
xc: detail: elf_parse_binary: memory: 0x100000 -> 0x36b324
xc: detail: VIRTUAL MEMORY ARRANGEMENT:
xc: detail:   Loader: 0000000000100000->000000000036b324
xc: detail:   Modules: 0000000000000000->0000000000000000
xc: detail:   TOTAL: 0000000000000000->0000000078000000
xc: detail:   ENTRY:    0000000000100000
xc: detail: PHYSICAL MEMORY ALLOCATION:
xc: detail:   4KB PAGES: 0x0000000000000200
xc: detail:   2MB PAGES: 0x00000000000003bf
xc: detail:   1GB PAGES: 0x0000000000000000
xc: detail: elf_load_binary: phdr 0 at 0x7f1f9729f000 -> 0x7f1f975012b0 libxl: debug: libxl_device.c:269:libxl__device_disk_set_backend: Disk vdev=hda spec.backend=qdisk libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac4ad0: deregister unregistered libxl: debug: libxl_dm.c:1415:libxl__spawn_local_dm: Spawning device-model /usr/lib/xen/bin/qemu-gdb with arguments: libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: /usr/lib/xen/bin/qemu-gdb 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -xen-domid
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   9
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: socket,id=libxl-cmd,path=/var/run/xen/qmp-libxl-9,server,nowait 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -mon
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: chardev=libxl-cmd,mode=control 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -nodefaults
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -name
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: FEDORA
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -k
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   it
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -spice
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: port=6005,tls-port=0,addr=0.0.0.0,disable-ticketing,agent-mouse=on,disable-copy-paste 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: virtio-serial
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: spicevmc,id=vdagent,name=vdagent 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: virtserialport,chardev=vdagent,name=com.redhat.spice.0 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: qxl-vga,vram_size_mb=64,ram_size_mb=64 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -boot
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: order=dc
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: ich9-usb-ehci1,id=usb,addr=0x1d.0x7,multifunction=on 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: ich9-usb-uhci1,masterbus=usb.0,firstport=0,addr=0x1d.0,multifunction=on 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: ich9-usb-uhci2,masterbus=usb.0,firstport=2,addr=0x1d.0x1,multifunction=on 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: ich9-usb-uhci3,masterbus=usb.0,firstport=4,addr=0x1d.0x2,multifunction=on 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc1 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: usb-redir,chardev=usbrc1,id=usbrc1 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc2 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: usb-redir,chardev=usbrc2,id=usbrc2 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc3 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: usb-redir,chardev=usbrc3,id=usbrc3 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -chardev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: spicevmc,name=usbredir,id=usbrc4 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: usb-redir,chardev=usbrc4,id=usbrc4 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -soundhw
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   hda
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -smp
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: 2,maxcpus=2
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -device
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: rtl8139,id=nic0,netdev=net0,mac=00:16:3e:18:e1:35 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -netdev
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: type=tap,id=net0,ifname=vif9.0-emu,script=no,downscript=no 
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -machine
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   xenfv
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   -m
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm:   1920
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: -drive
libxl: debug: libxl_dm.c:1417:libxl__spawn_local_dm: file=/mnt/vm/disks/FEDORA19.disk1.xm,if=ide,index=0,media=disk,format=raw,cache=writeback libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0xac3558 wpath=/local/domain/0/device-model/9/state token=3/0: register slotnum=3 libxl: debug: libxl_create.c:1545:do_domain_create: ao 0xac2660: inprogress: poller=0xac2af0, flags=i libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0xac3558 wpath=/local/domain/0/device-model/9/state token=3/0: event epath=/local/domain/0/device-model/9/state libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0xac3558 wpath=/local/domain/0/device-model/9/state token=3/0: event epath=/local/domain/0/device-model/9/state libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0xac3558 wpath=/local/domain/0/device-model/9/state token=3/0: deregister slotnum=3 libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac3558: deregister unregistered libxl: debug: libxl_qmp.c:691:libxl__qmp_initialize: connected to /var/run/xen/qmp-libxl-9 
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: qmp
libxl: debug: libxl_qmp.c:541:qmp_send_prepare: next qmp command: '{
    "execute": "qmp_capabilities",
    "id": 1
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return 
libxl: debug: libxl_qmp.c:541:qmp_send_prepare: next qmp command: '{
    "execute": "query-chardev",
    "id": 2
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return 
libxl: debug: libxl_qmp.c:541:qmp_send_prepare: next qmp command: '{
    "execute": "query-vnc",
    "id": 3
}
'
libxl: debug: libxl_qmp.c:296:qmp_handle_response: message type: return libxl: debug: libxl_event.c:570:libxl__ev_xswatch_register: watch w=0xac8368 wpath=/local/domain/0/backend/vif/9/0/state token=3/1: register slotnum=3 libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0xac8368 wpath=/local/domain/0/backend/vif/9/0/state token=3/1: event epath=/local/domain/0/backend/vif/9/0/state libxl: debug: libxl_event.c:810:devstate_watch_callback: backend /local/domain/0/backend/vif/9/0/state wanted state 2 still waiting state 1 libxl: debug: libxl_event.c:514:watchfd_callback: watch w=0xac8368 wpath=/local/domain/0/backend/vif/9/0/state token=3/1: event epath=/local/domain/0/backend/vif/9/0/state libxl: debug: libxl_event.c:806:devstate_watch_callback: backend /local/domain/0/backend/vif/9/0/state wanted state 2 ok libxl: debug: libxl_event.c:606:libxl__ev_xswatch_deregister: watch w=0xac8368 wpath=/local/domain/0/backend/vif/9/0/state token=3/1: deregister slotnum=3 libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac8368: deregister unregistered libxl: debug: libxl_device.c:1028:device_hotplug: calling hotplug script: /etc/xen/scripts/vif-bridge online libxl: debug: libxl_aoutils.c:513:libxl__async_exec_start: forking to execute: /etc/xen/scripts/vif-bridge online libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac83f0: deregister unregistered libxl: debug: libxl_device.c:1028:device_hotplug: calling hotplug script: /etc/xen/scripts/vif-bridge add libxl: debug: libxl_aoutils.c:513:libxl__async_exec_start: forking to execute: /etc/xen/scripts/vif-bridge add libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac83f0: deregister unregistered libxl: debug: libxl_event.c:618:libxl__ev_xswatch_deregister: watch w=0xac83f0: deregister unregistered libxl: debug: libxl_event.c:1909:libxl__ao_progress_report: ao 0xac2660: progress report: ignored libxl: debug: libxl_event.c:1739:libxl__ao_complete: ao 0xac2660: complete, rc=0 libxl: debug: libxl_event.c:1711:libxl__ao__destroy: ao 0xac2660: destroy 
xc: debug: hypercall buffer: total allocations:704 total releases:704
xc: debug: hypercall buffer: current allocations:0 maximum allocations:4 
xc: debug: hypercall buffer: cache current size:4
xc: debug: hypercall buffer: cache hits:692 misses:4 toobig:8
xc: debug: hypercall buffer: total allocations:0 total releases:0
xc: debug: hypercall buffer: current allocations:0 maximum allocations:0 
xc: debug: hypercall buffer: cache current size:0
xc: debug: hypercall buffer: cache hits:0 misses:0 toobig:0


xl dmesg

(d9) HVM Loader
(d9) Detected Xen v4.5.0-rc
(d9) Xenbus rings @0xfeffc000, event channel 1
(d9) System requested SeaBIOS
(d9) CPU speed is 2660 MHz
(d9) Relocating guest memory for lowmem MMIO space disabled
(XEN) irq.c:279: Dom9 PCI link 0 changed 0 -> 5
(d9) PCI-ISA link 0 routed to IRQ5
(XEN) irq.c:279: Dom9 PCI link 1 changed 0 -> 10
(d9) PCI-ISA link 1 routed to IRQ10
(XEN) irq.c:279: Dom9 PCI link 2 changed 0 -> 11
(d9) PCI-ISA link 2 routed to IRQ11
(XEN) irq.c:279: Dom9 PCI link 3 changed 0 -> 5
(d9) PCI-ISA link 3 routed to IRQ5
(d9) pci dev 01:3 INTA->IRQ10
(d9) pci dev 02:0 INTA->IRQ11
(d9) pci dev 03:0 INTA->IRQ5
(d9) pci dev 04:0 INTA->IRQ5
(d9) pci dev 05:0 INTA->IRQ10
(d9) pci dev 06:0 INTA->IRQ11
(d9) pci dev 1d:0 INTA->IRQ10
(d9) pci dev 1d:1 INTB->IRQ11
(d9) pci dev 1d:2 INTC->IRQ5
(d9) pci dev 1d:7 INTD->IRQ5
(d9) No RAM in high memory; setting high_mem resource base to 100000000 
(d9) pci dev 05:0 bar 10 size 004000000: 0f0000000
(d9) pci dev 05:0 bar 14 size 004000000: 0f4000000
(d9) pci dev 02:0 bar 14 size 001000000: 0f8000008
(d9) pci dev 06:0 bar 30 size 000040000: 0f9000000
(d9) pci dev 05:0 bar 30 size 000010000: 0f9040000
(d9) pci dev 03:0 bar 10 size 000004000: 0f9050000
(d9) pci dev 05:0 bar 18 size 000002000: 0f9054000
(d9) pci dev 04:0 bar 14 size 000001000: 0f9056000
(d9) pci dev 1d:7 bar 10 size 000001000: 0f9057000
(d9) pci dev 02:0 bar 10 size 000000100: 00000c001
(d9) pci dev 06:0 bar 10 size 000000100: 00000c101
(d9) pci dev 06:0 bar 14 size 000000100: 0f9058000
(d9) pci dev 04:0 bar 10 size 000000020: 00000c201
(d9) pci dev 05:0 bar 1c size 000000020: 00000c221
(d9) pci dev 1d:0 bar 20 size 000000020: 00000c241
(d9) pci dev 1d:1 bar 20 size 000000020: 00000c261
(d9) pci dev 1d:2 bar 20 size 000000020: 00000c281
(d9) pci dev 01:1 bar 20 size 000000010: 00000c2a1
(d9) Multiprocessor initialisation:
(d9) - CPU0 ... 36-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done. (d9) - CPU1 ... 36-bit phys ... fixed MTRRs ... var MTRRs [1/8] ... done. 
(d9) Testing HVM environment:
(d9)  - REP INSB across page boundaries ... passed
(d9)  - GS base MSRs and SWAPGS ... passed
(d9) Passed 2 of 2 tests
(d9) Writing SMBIOS tables ...
(d9) Loading SeaBIOS ...
(d9) Creating MP tables ...
(d9) Loading ACPI ...
(d9) S3 disabled
(d9) S4 disabled
(d9) vm86 TSS at fc00a100
(d9) BIOS map:
(d9)  10000-100d3: Scratch space
(d9)  c0000-fffff: Main BIOS
(d9) E820 table:
(d9)  [00]: 00000000:00000000 - 00000000:000a0000: RAM
(d9)  HOLE: 00000000:000a0000 - 00000000:000c0000
(d9)  [01]: 00000000:000c0000 - 00000000:00100000: RESERVED
(d9)  [02]: 00000000:00100000 - 00000000:78000000: RAM
(d9)  HOLE: 00000000:78000000 - 00000000:fc000000
(d9)  [03]: 00000000:fc000000 - 00000001:00000000: RESERVED
(d9) Invoking SeaBIOS ...
(d9) SeaBIOS (version debian/1.7.5-1-0-g506b58d-20140603_102943-testVS01OU) 
(d9)
(d9) Found Xen hypervisor signature at 40000000
(d9) Running on QEMU (i440fx)
(d9) xen: copy e820...
(d9) Relocating init from 0x000df619 to 0x77fae600 (size 71995)
(d9) CPU Mhz=2660
(d9) Found 13 PCI devices (max PCI bus is 00)
(d9) Allocated Xen hypercall page at 77fff000
(d9) Detected Xen v4.5.0-rc
(d9) xen: copy BIOS tables...
(d9) Copying SMBIOS entry point from 0x00010010 to 0x000f0f40
(d9) Copying MPTABLE from 0xfc001160/fc001170 to 0x000f0e40
(d9) Copying PIR from 0x00010030 to 0x000f0dc0
(d9) Copying ACPI RSDP from 0x000100b0 to 0x000f0d90
(d9) Using pmtimer, ioport 0xb008
(d9) Scan for VGA option rom
(d9) Running option rom at c000:0003
(XEN) stdvga.c:147:d9v0 entering stdvga and caching modes
(d9) pmm call arg1=0
(d9) Turning on vga text mode console
(d9) SeaBIOS (version debian/1.7.5-1-0-g506b58d-20140603_102943-testVS01OU) 
(d9) Machine UUID 2eca57e6-bff7-404e-bbda-1926d614cd28
(d9) EHCI init on dev 00:1d.7 (regs=0xf9057020)
(d9) Found 0 lpt ports
(d9) Found 0 serial ports
(d9) ATA controller 1 at 1f0/3f4/0 (irq 14 dev 9)
(d9) ATA controller 2 at 170/374/0 (irq 15 dev 9)
(d9) ata0-0: QEMU HARDDISK ATA-7 Hard-Disk (10000 MiBytes)
(d9) Searching bootorder for: /pci@i0cf8/*@1,1/drive@0/disk@0
(d9) UHCI init on dev 00:1d.0 (io=c240)
(d9) UHCI init on dev 00:1d.1 (io=c260)
(d9) UHCI init on dev 00:1d.2 (io=c280)
(d9) PS2 keyboard initialized
(d9) All threads complete.
(d9) Scan for option roms
(d9) Running option rom at c980:0003
(d9) pmm call arg1=1
(d9) pmm call arg1=0
(d9) pmm call arg1=1
(d9) pmm call arg1=0
(d9) Searching bootorder for: /pci@i0cf8/*@6
(d9)
(d9) Press F12 for boot menu.
(d9)
(d9) Searching bootorder for: HALT
(d9) drive 0x000f0d40: PCHS=16383/16/63 translation=lba LCHS=1024/255/63 s=20480000 
(d9) Space available for UMB: ca800-ef000, f0000-f0d40
(d9) Returned 258048 bytes of ZoneHigh
(d9) e820 map has 6 items:
(d9)   0: 0000000000000000 - 000000000009fc00 = 1 RAM
(d9)   1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
(d9)   2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
(d9)   3: 0000000000100000 - 0000000077fff000 = 1 RAM
(d9)   4: 0000000077fff000 - 0000000078000000 = 2 RESERVED
(d9)   5: 00000000fc000000 - 0000000100000000 = 2 RESERVED
(d9) enter handle_19:
(d9)   NULL
(d9) Booting from Hard Disk...
(d9) Booting from 0000:7c00
(XEN) irq.c:389: Dom9 callback via changed to Direct Vector 0xf3
(XEN) irq.c:279: Dom9 PCI link 0 changed 5 -> 0
(XEN) irq.c:279: Dom9 PCI link 1 changed 10 -> 0
(XEN) irq.c:279: Dom9 PCI link 2 changed 11 -> 0
(XEN) irq.c:279: Dom9 PCI link 3 changed 5 -> 0


domU's xl cfg:

name='FEDORA'
builder="hvm"
device_model_override="/usr/lib/xen/bin/qemu-gdb"
memory=2048
vcpus=2
acpi_s3=0
acpi_s4=0
vif=['bridge=xenbr0']
disk=['/mnt/vm/disks/FEDORA19.disk1.xm,raw,hda,rw']
boot='dc'
device_model_version='qemu-xen'
vnc=0
keymap="it"
vga="qxl"
spice=1
spicehost='0.0.0.0'
spiceport=6005
spicedisable_ticketing=1
spicevdagent=1
spice_clipboard_sharing=0
spiceusbredirection=4
soundhw="hda"
I tested also with stdvga instead of qxl vga but qemu crash always on fedora boot with same error. 

If you need more informations/tests tell me and I'll post them.

Thanks for any reply and sorry for my bad english.








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