Il 16/07/2015 16:54, Wang, Zhi A ha scritto:
Hi Fantoni:
If the emulation is successfully done without problem, maybe the instruction
emulator in xen inject an incorrect fault into HVM, so that Xorg got killed.
Can you also show the binary opcode with asm code? It looks only asm code in
the gdb log.
Thanks for reply, I tried to add some gdprintk on probable fail about
movaps, more exactly before these lines:
4005 fail_if(vex.pfx & VEX_PREFIX_SCALAR_MASK);
4037 fail_if((vex.opcx != vex_0f) ||
4050 generate_exception_if((b >= 0x28) &&
But xl dmesg showed nothing.
Gdb data more complete that this (full backtrace, registers, latest
instructions and threads backtrace) I not found, see attachment.
This is the command used:
gdb -batch-silent -ex "run" -ex "set logging overwrite on" -ex "set
logging file /root/X-gdb.log" -ex "set logging on" -ex "set pagination
off" -ex "handle SIG33 pass nostop noprint" -ex "echo Full
backtrace:\n" -ex "backtrace full" -ex "echo \n\nRegisters:\n" -ex
"info registers" -ex "echo \n\nCurrent instructions:\n" -ex "x/16i
\$pc" -ex "echo \n\nThreads backtrace:\n" -ex "thread apply all
backtrace" -ex "set logging off" -ex "quit" --args "/usr/bin/X.bak" "$@"
Do you mean that I need something more complete to replace this about
instructions? x/16i $pc
Another thing, on fedora 21 (where xorg crash is sid instead) where qemu
is a 100% cpu (Xorg of domU) I saw that after long time arrive to view
correct login page also with qxl, probably was about 20 minutes instead
of 3-4 seconds max, pratically seems working (probably after latest one
or more of many x86/hvm patches) but with performance 1/1000 or lesser
that normal.
Probably is something similar to windows some years ago where before an
old Jan Beulich patch performance (based on screen output) was 1/10 or
lesser.
Sorry if I had too low knowledge to find exact problem or at least all
useful data :(
-----Original Message-----
From: Fabio Fantoni [mailto:fabio.fant...@m2r.biz]
Sent: Thursday, July 16, 2015 8:15 PM
To: Wang, Zhi A; Jan Beulich
Cc: Andrew Cooper; Paul Durrant; xen-devel
Subject: Re: SSE instruction emulation issues
Il 15/07/2015 16:35, Wang, Zhi A ha scritto:
You can put the MMIO emulation failed output message in the email like what I
did, that will help to cook a patch for instruction emulator. Only gdb log is
not enough as xen-developer has to know the exact opcode. I also found that not
all forms of one SSE instruction was supported, for example an instruction may
support move data from xmm register to mem, or move from xmm register to xmm
registers, maybe only one form is supported in the instruction emulator.
Thanks for your reply, unfortunately don't give directly "MMIO emulation failed" but on
"better" cases only software crash inside domUs, on other only qemu at 100% cpu and in
domUs black screen ecc...
There are also many other cases of "strange" low performance probably related
to MMIO operations.
I started to find it some years ago on hvm desktop domUs, derisory/hardly
visible on older windows like xp or linux DE with fewer effects and lower
screen resolution of client used and increasing using newer system, DE and
bigger resolutions.
Using only thing like rdp inside domU's S.O. the problem is minimized, using
client for connecting directly to domUs like spice is increased.
Seems increased also using rdp but using softwares that use "more graphic
operations" (even if not 3D).
Trying similar thing on kvm instead using same qemu upstream version similar
domU configuration ecc.. is better.
About more specific problem with qxl vga on xen was unable to works at all
until 2 memory fixes in libxl/qemu did by anthony perard 3-4 years ago is I
remember good, after on windows domUs was working but with very bad
performance, after Jan beulich a fix about x86/hvm 2-3 years performances
became decent and other x86/hvm changes in latest 1-2 years they made the
performance closer to kvm for most of the vm windows.
About linux domUs qxl seems correctly working on suse as dom0 and domUs as
reported by a suse developer but I not found the specific suse workaround, may
be also other cases where is working out-of-box.
Xen is already better for many features and find/solves this problem probably
make it very good also in all recent desktop necessity (except particular 3d
acceleration that require phisical vga or similar).
About cases where I taken backtrace of domU's X crash I suppose I must find
possible fails case without output in xl dmesg and add output to find what is
the exact case, right?
I should add gdprintk(XENLOG_INFO,"...\n"); in any fail_if() and
generate_exception_if() that can be related to movaps for example based on
backtrace, or is this wrong or stupid?
Thanks for any reply and sorry for my bad english.
Thanks,
Zhi.
-----Original Message-----
From: Fabio Fantoni [mailto:fabio.fant...@m2r.biz]
Sent: Wednesday, July 15, 2015 9:56 PM
To: Jan Beulich
Cc: Andrew Cooper; Paul Durrant; Wang, Zhi A; xen-devel
Subject: Re: SSE instruction emulation issues
Il 15/07/2015 13:35, Jan Beulich ha scritto:
On 15.07.15 at 13:13, <fabio.fant...@m2r.biz> wrote:
Il 10/07/2015 14:16, Jan Beulich ha scritto:
On 10.07.15 at 14:00, <andrew.coop...@citrix.com> wrote:
On 09/07/15 20:32, Zhi Wang wrote:
We found that MOVD instruction are used by some windows
driver during developing XenGT, and also we found this one:
(XEN) MMIO emulation failed: d7v1 64bit @ 0010:fffff8000294e273
->
66 0f e7 00 48 83 c0 10 45 3 b cb 73 f0 45 85 c9
Disassembly:
0: 66 0f e7 00 movntdq %xmm0,(%rax)
4: 48 83 c0 10 add $0x10,%rax
8: 45 3b cb cmp %r11d,%r9d
b: 73 f0 jae 0xfffffffffffffffd
d: 45 85 c9 test %r9d,%r9d
The x86 instruction emulator does appear to have a decode for this
instruction. This failure suggests that the implementation is buggy.
To start with diagnosing, add a test case to
tools/tests/x86_emulator/test_x86_emulator.c
Considering that we already test MOVDQU, the emulation of which
shares code with MOVNTDQ (which only differs in aspects not of
interest to the emulator) I'm not sure this will turn up anything
interesting. Perhaps an even easier step would be to simply run the
emulator test on the machine where the issue is seen? We're playing
some prefix byte tricks there... Otoh failure to execute the
constructed instruction would bring down the hypervisor.
I also have a problem with mmio as I already reported many times but
I
And to be honest, I don't see the value in re-stating this every once
in a while without providing any new information.
don't know if it is the same as the one reported by the intel
developer about xengt, I have it in linux hvm domUs with qxl.
Looks different - their's was about MOVD (which we clearly don't
support right now) while yours looks to be about MOVAPS.
Today with the latest xen update from git staging (with the
addiction of the xengt patch that add support of emulating SSE2
instruction
MOVD) I had a different domU's Xorg backtrace containing also a
"error: Cannot access memory at address":
Sadly a gdb backtrace is nothing I can see use extract useful
information from. Iirc Paul had already asked you to instrument the
involved code paths (considering that the x86 insn emulator supports
MOVAPS as used by the failing code) to figure out where in the whole
involved stack the failure actually originates.
Jan
Thanks for your reply, as I wrote the other times I don't know a
better debug method about particular things like this (x86
instructions
emulation) and I'm asking what I should do.
If you mean to look at the code involved, search the part about the problem, think how
can go wrong or unexpected, add debug output if needed, try quick changes to it ecc... I
can do it with simpler software and I did something similar with libxl but I don't know
how to do the same for code like xen/arch/x86/x86_emulate/x86_emulate.c. I already took a
look at it but I didn't find "MOVAPS" in comments like many others.
If the problem is located in something like libxl where there are instructions
that I know or that are intuitive I can imagine what the software is supposed
to do and I can do quick targeted tests or changes, but on thing like x86
emulation I can't (or at least not before knowing all instructions and
essential data about it).
Is this what you mean and is that the only way to collect useful data or to
solve the problem?
If so, I suppose that for any change in xen/arch/x86/x86_emulate and similar I
can't simply make the change, do a make, make install and test it immediatly
like libxl/xl but I have to rebuild full xen, install it and reboot dom0, is it
right?
Can you post a link with a quick reference about x86 emulation and/or
instruction sets like sse2 which can help me learn what to do or an extensive
knowledge on the subject is required in this case?
What kind of logging instruction for debug can I use? Are they visible with xl
dmesg or I must do something different and more specific in this case?
Thanks for any reply and sorry for my bad english.
Full backtrace:
#0 sse2_blt (src_bits=<optimized out>, dst_bits=<optimized out>,
src_stride=<optimized out>, dst_stride=<optimized out>, src_bpp=<optimized
out>, src_x=<optimized out>, src_y=0, dest_x=0, dest_y=0, width=1024,
height=<optimized out>, dst_bpp=<optimized out>, imp=<optimized out>) at
../../pixman/pixman-sse2.c:4770
w = 4160
s = 0x7f39f0abefc0 <error: Cannot access memory at address
0x7f39f0abefc0>
d = 0x7f39fe80a000 <error: Cannot access memory at address
0x7f39fe80a000>
src_bytes = 0x7f39f0abe000 <error: Cannot access memory at address
0x7f39f0abe000>
dst_bytes = <optimized out>
byte_width = 4096
#1 0x00007f39fc399a39 in sse2_blt (height=768, width=1024, dest_y=0,
dest_x=<optimized out>, src_y=<optimized out>, src_x=<optimized out>,
dst_bpp=<optimized out>, src_bpp=<optimized out>, dst_stride=<optimized out>,
src_stride=<optimized out>, dst_bits=<optimized out>, src_bits=<optimized out>,
imp=<optimized out>) at ../../pixman/pixman-sse2.c:4822
No locals.
#2 sse2_composite_copy_area (imp=<optimized out>, info=<optimized out>) at
../../pixman/pixman-sse2.c:4815
op = <optimized out>
src_image = <optimized out>
mask_image = <optimized out>
dest_image = <optimized out>
src_x = <optimized out>
src_y = <optimized out>
mask_x = <optimized out>
mask_y = <optimized out>
dest_x = <optimized out>
dest_y = 0
width = 1024
height = 768
#3 0x00007f39fc311711 in pixman_image_composite32 (op=op@entry=PIXMAN_OP_SRC,
src=<optimized out>, mask=mask@entry=0x0, dest=<optimized out>,
src_x=src_x@entry=0, src_y=src_y@entry=0, mask_x=0, mask_y=0, dest_x=0,
dest_y=0, width=1024, height=768) at ../../pixman/pixman.c:707
src_format = <optimized out>
mask_format = 0
dest_format = PIXMAN_a8r8g8b8
region = {extents = {x1 = 0, y1 = 0, x2 = 1024, y2 = 768}, data = 0x0}
extents = {x1 = 0, y1 = 0, x2 = 1024, y2 = 768}
imp = 0x7f39fdddb8a0
func = 0x7f39fc3999d0 <sse2_composite_copy_area>
info = {op = PIXMAN_OP_SRC, src_image = 0x7f39fe1910b0, mask_image =
0x0, dest_image = 0x7f39fe1911c0, src_x = 0, src_y = 0, mask_x = 0, mask_y = 0,
dest_x = 0, dest_y = 0, width = 1024, height = 768, src_flags = 42420863,
mask_flags = 8194, dest_flags = 34032255}
pbox = 0x7ffdbbb1cca0
n = 0
#4 0x00007f39fc3117e3 in pixman_image_composite (op=op@entry=PIXMAN_OP_SRC,
src=<optimized out>, mask=mask@entry=0x0, dest=<optimized out>,
src_x=src_x@entry=0, src_y=src_y@entry=0, mask_x=<optimized out>,
mask_y=<optimized out>, dest_x=<optimized out>, dest_y=<optimized out>,
width=<optimized out>, height=<optimized out>) at ../../pixman/pixman.c:730
No locals.
#5 0x00007f39f710bca8 in download_box_no_update (surface=0x7f39fe190ff0,
surface=0x7f39fe190ff0, y2=<optimized out>, x2=<optimized out>, y1=0, x1=0) at
../../src/qxl_surface.c:133
No locals.
#6 qxl_download_box (surface=0x7f39fe190ff0, x1=0, y1=0, x2=<optimized out>,
y2=<optimized out>) at ../../src/qxl_surface.c:150
No locals.
#7 0x00007f39f710bdaf in qxl_surface_prepare_access (surface=0x7f39fe190ff0,
pixmap=0x7f39fe18d830, region=0x7ffdbbb1cdd0, access=<optimized out>) at
../../src/qxl_surface.c:183
n_boxes = <optimized out>
boxes = 0x7ffdbbb1cdd0
pScreen = 0x7f39fde00a20
pScrn = <optimized out>
new = {extents = {x1 = 0, y1 = 0, x2 = 1024, y2 = 768}, data = 0x0}
#8 0x00007f39f7116d6d in uxa_prepare_access (pDrawable=0x7f39fe18d830,
region=0x7ffdbbb1ce40, region@entry=0x0, access=access@entry=UXA_ACCESS_RO) at
../../../src/uxa/uxa.c:172
pScreen = <optimized out>
xoff = 0
yoff = 0
pPixmap = 0x7f39fe18d830
box = {x1 = 0, y1 = 0, x2 = <optimized out>, y2 = <optimized out>}
region_rec = {extents = {x1 = 0, y1 = 0, x2 = 1024, y2 = 768}, data =
0x0}
result = 1
#9 0x00007f39f71170f0 in uxa_prepare_access_window (pWin=0x7f39fde5f530) at
../../../src/uxa/uxa.c:310
No locals.
#10 0x00007f39f7117187 in uxa_change_window_attributes (pWin=0x7f39fde5f530,
mask=1) at ../../../src/uxa/uxa.c:343
ret = <optimized out>
need_access = 1
#11 0x00007f39fd3de6fd in compChangeWindowAttributes (pWin=0x7f39fde5f530,
mask=1) at ../../composite/compinit.c:117
pScreen = 0x7f39fde00a20
ret = <optimized out>
#12 0x00007f39fd37fef4 in ChangeWindowAttributes (pWin=0x7f39fde5f530,
vmask=<optimized out>, vlist=vlist@entry=0x7f39fe18f304,
client=client@entry=0x7f39fe18cf90) at ../../dix/window.c:1460
pVlist = 0x7f39fe18f308
pPixmap = 0x7f39fe18d830
pixID = <optimized out>
pCursor = 0x0
pOldCursor = <optimized out>
cursorID = <optimized out>
pChild = <optimized out>
cmap = <optimized out>
pCmap = 0x2040000000
xE = {u = {u = {type = 144 '\220', detail = 207 '\317', sequenceNumber
= 65048}, keyButtonPointer = {pad00 = 4263038864, time = 32569, root = 390,
event = 0, child = 3148992480, rootX = 32765, rootY = 0, eventX = 26524, eventY
= -715, state = 32569, sameScreen = 0 '\000', pad1 = 0 '\000'}, enterLeave =
{pad00 = 4263038864, time = 32569, root = 390, event = 0, child = 3148992480,
rootX = 32765, rootY = 0, eventX = 26524, eventY = -715, state = 32569, mode =
0 '\000', flags = 0 '\000'}, focus = {pad00 = 4263038864, window = 32569, mode
= 134 '\206', pad1 = 1 '\001', pad2 = 0 '\000', pad3 = 0 '\000'}, expose =
{pad00 = 4263038864, window = 32569, x = 390, y = 0, width = 0, height = 0,
count = 53216, pad2 = 48049}, graphicsExposure = {pad00 = 4263038864, drawable
= 32569, x = 390, y = 0, width = 0, height = 0, minorEvent = 53216, count =
48049, majorEvent = 253 '\375', pad1 = 127 '\177', pad2 = 0 '\000', pad3 = 0
'\000'}, noExposure = {pad00 = 4263038864, drawable = 32569, minorEvent = 390,
majorEvent = 0 '\000', bpad = 0 '\000'}, visibility = {pad00 = 4263038864,
window = 32569, state = 134 '\206', pad1 = 1 '\001', pad2 = 0 '\000', pad3 = 0
'\000'}, createNotify = {pad00 = 4263038864, parent = 32569, window = 390, x =
0, y = 0, width = 53216, height = 48049, borderWidth = 32765, override = 0
'\000', bpad = 0 '\000'}, destroyNotify = {pad00 = 4263038864, event = 32569,
window = 390}, unmapNotify = {pad00 = 4263038864, event = 32569, window = 390,
fromConfigure = 0 '\000', pad1 = 0 '\000', pad2 = 0 '\000', pad3 = 0 '\000'},
mapNotify = {pad00 = 4263038864, event = 32569, window = 390, override = 0
'\000', pad1 = 0 '\000', pad2 = 0 '\000', pad3 = 0 '\000'}, mapRequest = {pad00
= 4263038864, parent = 32569, window = 390}, reparent = {pad00 = 4263038864,
event = 32569, window = 390, parent = 0, x = -12320, y = -17487, override = 253
'\375', pad1 = 127 '\177', pad2 = 0 '\000', pad3 = 0 '\000'}, configureNotify =
{pad00 = 4263038864, event = 32569, window = 390, aboveSibling = 0, x = -12320,
y = -17487, width = 32765, height = 0, borderWidth = 26524, override = 53 '5',
bpad = 253 '\375'}, configureRequest = {pad00 = 4263038864, parent = 32569,
window = 390, sibling = 0, x = -12320, y = -17487, width = 32765, height = 0,
borderWidth = 26524, valueMask = 64821, pad1 = 32569}, gravity = {pad00 =
4263038864, event = 32569, window = 390, x = 0, y = 0, pad1 = 3148992480, pad2
= 32765, pad3 = 4248135580, pad4 = 32569}, resizeRequest = {pad00 = 4263038864,
window = 32569, width = 390, height = 0}, circulate = {pad00 = 4263038864,
event = 32569, window = 390, parent = 0, place = 224 '\340', pad1 = 207 '\317',
pad2 = 177 '\261', pad3 = 187 '\273'}, property = {pad00 = 4263038864, window =
32569, atom = 390, time = 0, state = 224 '\340', pad1 = 207 '\317', pad2 =
48049}, selectionClear = {pad00 = 4263038864, time = 32569, window = 390, atom
= 0}, selectionRequest = {pad00 = 4263038864, time = 32569, owner = 390,
requestor = 0, selection = 3148992480, target = 32765, property = 4248135580},
selectionNotify = {pad00 = 4263038864, time = 32569, requestor = 390, selection
= 0, target = 3148992480, property = 32765}, colormap = {pad00 = 4263038864,
window = 32569, colormap = 390, new = 0 '\000', state = 0 '\000', pad1 = 0
'\000', pad2 = 0 '\000'}, mappingNotify = {pad00 = 4263038864, request = 57
'9', firstKeyCode = 127 '\177', count = 0 '\000', pad1 = 0 '\000'},
clientMessage = {pad00 = 4263038864, window = 32569, u = {l = {type = 390,
longs0 = 0, longs1 = -1145974816, longs2 = 32765, longs3 = -46831716, longs4 =
32569}, s = {type = 390, shorts0 = 0, shorts1 = 0, shorts2 = -12320, shorts3 =
-17487, shorts4 = 32765, shorts5 = 0, shorts6 = 26524, shorts7 = -715, shorts8
= 32569, shorts9 = 0}, b = {type = 390, bytes =
"\000\000\000\000\340ϱ\273\375\177\000\000\234g5\375\071\177\000"}}}}}
error = <optimized out>
rc = <optimized out>
pScreen = 0x7f39fde00a20
index2 = 1
tmask = <optimized out>
vmaskCopy = <optimized out>
val = <optimized out>
checkOptional = 0
borderRelative = 0
#13 0x00007f39fd34c2f6 in ProcChangeWindowAttributes (client=0x7f39fe18cf90) at
../../dix/dispatch.c:679
pWin = 0x7f39fde5f530
stuff = 0x7f39fe18f2f8
len = 1
rc = <optimized out>
access_mode = <optimized out>
#14 0x00007f39fd352117 in Dispatch () at ../../dix/dispatch.c:432
clientReady = 0x7f39fe1e8f70
result = <optimized out>
client = 0x7f39fe18cf90
nready = 0
icheck = 0x7f39fd748bf0 <checkForInput>
start_tick = 45
#15 0x00007f39fd35629b in dix_main (argc=7, argv=0x7ffdbbb1d1c8,
envp=<optimized out>) at ../../dix/main.c:298
i = <optimized out>
alwaysCheckForInput = {0, 1}
#16 0x00007f39fb21ab45 in __libc_start_main (main=0x7f39fd340660 <main>,
argc=7, argv=0x7ffdbbb1d1c8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffdbbb1d1b8) at libc-start.c:287
result = <optimized out>
unwind_buf = {cancel_jmp_buf = {{jmp_buf = {0, 413568259572484160,
139887037908581, 140727752446400, 0, 0, -412574937688979392,
-302096973215053760}, mask_was_saved = 0}}, priv = {pad = {0x0, 0x0,
0x7f39fd4bdd90 <__libc_csu_init>, 0x7ffdbbb1d1c8}, data = {prev = 0x0, cleanup
= 0x0, canceltype = -45359728}}}
not_first_call = <optimized out>
#17 0x00007f39fd34068e in _start ()
No symbol table info available.
Registers:
rax 0x7f39fe4e9a80 139887056427648
rbx 0x7f39f0abe000 139886827659264
rcx 0x7f39f0abf000 139886827663360
rdx 0x1000 4096
rsi 0x7f39fe80a040 139887059705920
rdi 0x7f39f0abf000 139886827663360
rbp 0x1000 0x1000
rsp 0x7ffdbbb1cbc8 0x7ffdbbb1cbc8
r8 0x1000 4096
r9 0x7f39fe4e9a80 139887056427648
r10 0x300 768
r11 0x1000 4096
r12 0xfffffffffffff000 -4096
r13 0x0 0
r14 0x0 0
r15 0x0 0
rip 0x7f39fc3998df 0x7f39fc3998df <sse2_blt+447>
eflags 0x10202 [ IF RF ]
cs 0x33 51
ss 0x2b 43
ds 0x0 0
es 0x0 0
fs 0x0 0
gs 0x0 0
Current instructions:
=> 0x7f39fc3998df <sse2_blt+447>: movaps %xmm3,-0x40(%rsi)
0x7f39fc3998e3 <sse2_blt+451>: movaps %xmm2,-0x30(%rsi)
0x7f39fc3998e7 <sse2_blt+455>: movaps %xmm1,-0x20(%rsi)
0x7f39fc3998eb <sse2_blt+459>: movaps %xmm0,-0x10(%rsi)
0x7f39fc3998ef <sse2_blt+463>: cmp $0x3f,%r8d
0x7f39fc3998f3 <sse2_blt+467>: jg 0x7f39fc3998c0 <sse2_blt+416>
0x7f39fc3998f5 <sse2_blt+469>: sub $0x40,%edx
0x7f39fc3998f8 <sse2_blt+472>: mov %edx,%esi
0x7f39fc3998fa <sse2_blt+474>: shr $0x6,%esi
0x7f39fc3998fd <sse2_blt+477>: mov %esi,%ecx
0x7f39fc3998ff <sse2_blt+479>: shl $0x6,%esi
0x7f39fc399902 <sse2_blt+482>: add $0x1,%rcx
0x7f39fc399906 <sse2_blt+486>: sub %esi,%edx
0x7f39fc399908 <sse2_blt+488>: shl $0x6,%rcx
0x7f39fc39990c <sse2_blt+492>: add %rcx,%rdi
0x7f39fc39990f <sse2_blt+495>: add %rcx,%rax
Threads backtrace:
Thread 3 (Thread 0x7f39f262b700 (LWP 1902)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1 0x00007f39f60ac463 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2 0x00007f39f60abcc7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3 0x00007f39fa9c00a4 in start_thread (arg=0x7f39f262b700) at
pthread_create.c:309
#4 0x00007f39fb2df07d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 2 (Thread 0x7f39f2e2c700 (LWP 1901)):
#0 pthread_cond_wait@@GLIBC_2.3.2 () at
../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1 0x00007f39f60ac463 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#2 0x00007f39f60abcc7 in ?? () from /usr/lib/x86_64-linux-gnu/dri/swrast_dri.so
#3 0x00007f39fa9c00a4 in start_thread (arg=0x7f39f2e2c700) at
pthread_create.c:309
#4 0x00007f39fb2df07d in clone () at
../sysdeps/unix/sysv/linux/x86_64/clone.S:111
Thread 1 (Thread 0x7f39fd6fb980 (LWP 1897)):
#0 sse2_blt (src_bits=<optimized out>, dst_bits=<optimized out>,
src_stride=<optimized out>, dst_stride=<optimized out>, src_bpp=<optimized
out>, src_x=<optimized out>, src_y=0, dest_x=0, dest_y=0, width=1024,
height=<optimized out>, dst_bpp=<optimized out>, imp=<optimized out>) at
../../pixman/pixman-sse2.c:4770
#1 0x00007f39fc399a39 in sse2_blt (height=768, width=1024, dest_y=0,
dest_x=<optimized out>, src_y=<optimized out>, src_x=<optimized out>,
dst_bpp=<optimized out>, src_bpp=<optimized out>, dst_stride=<optimized out>,
src_stride=<optimized out>, dst_bits=<optimized out>, src_bits=<optimized out>,
imp=<optimized out>) at ../../pixman/pixman-sse2.c:4822
#2 sse2_composite_copy_area (imp=<optimized out>, info=<optimized out>) at
../../pixman/pixman-sse2.c:4815
#3 0x00007f39fc311711 in pixman_image_composite32 (op=op@entry=PIXMAN_OP_SRC,
src=<optimized out>, mask=mask@entry=0x0, dest=<optimized out>,
src_x=src_x@entry=0, src_y=src_y@entry=0, mask_x=0, mask_y=0, dest_x=0,
dest_y=0, width=1024, height=768) at ../../pixman/pixman.c:707
#4 0x00007f39fc3117e3 in pixman_image_composite (op=op@entry=PIXMAN_OP_SRC,
src=<optimized out>, mask=mask@entry=0x0, dest=<optimized out>,
src_x=src_x@entry=0, src_y=src_y@entry=0, mask_x=<optimized out>,
mask_y=<optimized out>, dest_x=<optimized out>, dest_y=<optimized out>,
width=<optimized out>, height=<optimized out>) at ../../pixman/pixman.c:730
#5 0x00007f39f710bca8 in download_box_no_update (surface=0x7f39fe190ff0,
surface=0x7f39fe190ff0, y2=<optimized out>, x2=<optimized out>, y1=0, x1=0) at
../../src/qxl_surface.c:133
#6 qxl_download_box (surface=0x7f39fe190ff0, x1=0, y1=0, x2=<optimized out>,
y2=<optimized out>) at ../../src/qxl_surface.c:150
#7 0x00007f39f710bdaf in qxl_surface_prepare_access (surface=0x7f39fe190ff0,
pixmap=0x7f39fe18d830, region=0x7ffdbbb1cdd0, access=<optimized out>) at
../../src/qxl_surface.c:183
#8 0x00007f39f7116d6d in uxa_prepare_access (pDrawable=0x7f39fe18d830,
region=0x7ffdbbb1ce40, region@entry=0x0, access=access@entry=UXA_ACCESS_RO) at
../../../src/uxa/uxa.c:172
#9 0x00007f39f71170f0 in uxa_prepare_access_window (pWin=0x7f39fde5f530) at
../../../src/uxa/uxa.c:310
#10 0x00007f39f7117187 in uxa_change_window_attributes (pWin=0x7f39fde5f530,
mask=1) at ../../../src/uxa/uxa.c:343
#11 0x00007f39fd3de6fd in compChangeWindowAttributes (pWin=0x7f39fde5f530,
mask=1) at ../../composite/compinit.c:117
#12 0x00007f39fd37fef4 in ChangeWindowAttributes (pWin=0x7f39fde5f530,
vmask=<optimized out>, vlist=vlist@entry=0x7f39fe18f304,
client=client@entry=0x7f39fe18cf90) at ../../dix/window.c:1460
#13 0x00007f39fd34c2f6 in ProcChangeWindowAttributes (client=0x7f39fe18cf90) at
../../dix/dispatch.c:679
#14 0x00007f39fd352117 in Dispatch () at ../../dix/dispatch.c:432
#15 0x00007f39fd35629b in dix_main (argc=7, argv=0x7ffdbbb1d1c8,
envp=<optimized out>) at ../../dix/main.c:298
#16 0x00007f39fb21ab45 in __libc_start_main (main=0x7f39fd340660 <main>,
argc=7, argv=0x7ffdbbb1d1c8, init=<optimized out>, fini=<optimized out>,
rtld_fini=<optimized out>, stack_end=0x7ffdbbb1d1b8) at libc-start.c:287
#17 0x00007f39fd34068e in _start ()
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