Hello Xen devs,
I'm learning code in xen-4.10.0/tools/xl to find out how to program with
libxl.
I've trying to use libxenlight.so (compiled and installed from xen 4.10.0
source code) to control my vms from my own code until I met this issue.
Now my test code follows xl_vmmcontrol.c and tries to create a VM from its
config file (file can be used to successfully create a vm with 'xl create').
My Xen make is successful and I can use 'xl' to manage all vms.
When I test my own code, I got such an error in dmesg"
test[16678]: segfault at 18 ip 00007f69fa6526ad sp 00007ffe1eadedf0 error 4
in libxenlight.so.4.10.0[7f69fa61a000+bc000] in dmesg
and also segmentation fault in my terminal.
I dumped my debugging info, hoping could give everyone some clue.
FYI, my program was compiled with:
gcc -m64 -pthread -std=gnu99 -g xl_executor.c xl_parse.c xl_utils.c
xl_nic.c -lxenlight -lxlutil -lxentoollog -lyajl -o test
where xl_executor.c is my code of creating a vm, all other c file are
copied from tools/xl/
GDB bebugging info:
Breakpoint 3, parse_config_data (config_source=0x7fffffffe360
"/data/chengkun/vms/vm4/vm4.cfg",
config_data=0x6155f0 "# ", '=' <repeats 69 times>, "\n# Example HVM
guest configuration\n# ", '=' <repeats 69 times>, "\n#\n# This is a fairly
m"..., config_len=1543,
d_config=0x7fffffffdde0) at xl_parse.c:993
993 if (libxl_cpu_bitmap_alloc(ctx, &b_info->avail_vcpus, l)) {
(gdb) p *c_info
$3 = {type = LIBXL_DOMAIN_TYPE_HVM, hap = {val = 0}, oos = {val = 0},
ssidref = 0, ssid_label = 0x0, name = 0x6154f0 "test_vm", uuid = {
uuid = "O\374\032\231+\330A\265\213rVސ\375\020\270"}, xsdata = 0x0,
platformdata = 0x0, poolid = 0, pool_name = 0x0, run_hotplug_scripts = {val
= 1}, driver_domain = {
val = 0}}
(gdb) p *b_info
$4 = {max_vcpus = 0, avail_vcpus = {size = 0, map = 0x0}, cpumap = {size =
0, map = 0x0}, nodemap = {size = 0, map = 0x0}, num_vcpu_hard_affinity = 0,
vcpu_hard_affinity = 0x0, num_vcpu_soft_affinity = 0, vcpu_soft_affinity
= 0x0, numa_placement = {val = 0}, tsc_mode = LIBXL_TSC_MODE_DEFAULT,
max_memkb = 4194304,
target_memkb = 2097152, video_memkb = 18446744073709551615, shadow_memkb
= 18446744073709551615, rtc_timeoffset = 0, exec_ssidref = 0,
exec_ssid_label = 0x0,
localtime = {val = 0}, disable_migrate = {val = 0}, cpuid = 0x0,
blkdev_start = 0x0, num_vnuma_nodes = 0, vnuma_nodes = 0x0,
max_grant_frames = 32,
max_maptrack_frames = 1024, device_model_version =
LIBXL_DEVICE_MODEL_VERSION_UNKNOWN, device_model_stubdomain = {val = 0},
device_model = 0x0, device_model_ssidref = 0,
device_model_ssid_label = 0x0, device_model_user = 0x0, extra = 0x0,
extra_pv = 0x0, extra_hvm = 0x0, sched_params = {sched =
LIBXL_SCHEDULER_UNKNOWN, weight = -1,
cap = -1, period = -1, budget = -1, extratime = -1, slice = -1, latency
= -1}, num_ioports = 0, ioports = 0x0, num_irqs = 0, irqs = 0x0, num_iomem
= 0, iomem = 0x0,
claim_mode = {val = 0}, event_channels = 0, kernel = 0x0, cmdline = 0x0,
ramdisk = 0x0, device_tree = 0x0, acpi = {val = 0}, bootloader = 0x0,
bootloader_args = 0x0,
timer_mode = LIBXL_TIMER_MODE_UNKNOWN, nested_hvm = {val = 0}, apic =
{val = 0}, dm_restrict = {val = 0}, type = LIBXL_DOMAIN_TYPE_HVM, u = {hvm
= {firmware = 0x0,
bios = LIBXL_BIOS_TYPE_UNKNOWN, pae = {val = 0}, apic = {val = 0},
acpi = {val = 0}, acpi_s3 = {val = 0}, acpi_s4 = {val = 0},
acpi_laptop_slate = {val = 0}, nx = {
val = 0}, viridian = {val = 0}, viridian_enable = {size = 0, map =
0x0}, viridian_disable = {size = 0, map = 0x0}, timeoffset = 0x0, hpet =
{val = 0}, vpt_align = {
val = 0}, mmio_hole_memkb = 18446744073709551615, timer_mode =
LIBXL_TIMER_MODE_UNKNOWN, nested_hvm = {val = 0}, altp2m = {val = 0},
system_firmware = 0x0,
smbios_firmware = 0x0, acpi_firmware = 0x0, hdtype =
LIBXL_HDTYPE_IDE, nographic = {val = 0}, vga = {kind =
LIBXL_VGA_INTERFACE_TYPE_UNKNOWN}, vnc = {enable = {
val = 0}, listen = 0x0, passwd = 0x0, display = 0, findunused =
{val = 0}}, keymap = 0x0, sdl = {enable = {val = 0}, opengl = {val = 0},
display = 0x0,
xauthority = 0x0}, spice = {enable = {val = 0}, port = 0, tls_port
= 0, host = 0x0, disable_ticketing = {val = 0}, passwd = 0x0, agent_mouse =
{val = 0},
vdagent = {val = 0}, clipboard_sharing = {val = 0}, usbredirection
= 0, image_compression = 0x0, streaming_video = 0x0}, gfx_passthru = {val =
0},
gfx_passthru_kind = LIBXL_GFX_PASSTHRU_KIND_DEFAULT, serial = 0x0,
boot = 0x0, usb = {val = 0}, usbversion = 0, usbdevice = 0x0, soundhw =
0x0, xen_platform_pci = {
val = 0}, usbdevice_list = 0x0, vendor_device =
LIBXL_VENDOR_DEVICE_NONE, ms_vm_genid = {bytes = '\000' <repeats 15
times>}, serial_list = 0x0, rdm = {
strategy = LIBXL_RDM_RESERVE_STRATEGY_IGNORE, policy =
LIBXL_RDM_RESERVE_POLICY_INVALID}, rdm_mem_boundary_memkb =
18446744073709551615, mca_caps = 0}, pv = {
kernel = 0x0, slack_memkb = 0, bootloader = 0x0, bootloader_args =
0x0, cmdline = 0x0, ramdisk = 0x0, features = 0x0, e820_host = {val = 0}}},
arch_arm = {
gic_version = LIBXL_GIC_VERSION_DEFAULT, vuart =
LIBXL_VUART_TYPE_UNKNOWN}, altp2m = LIBXL_ALTP2M_MODE_DISABLED}
(gdb) p ctx
$5 = (libxl_ctx *) 0x0
(gdb) p *ctx
$6 = <incomplete type>
(gdb) s
Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7b476ad in libxl.ptr_add () from
/usr/local/lib/libxenlight.so.4.10
Is that related to my compiling cmd?
Any help is appreciated.
Thanks,
K
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