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[Qemu-devel] [Bug 1594861] Re: QEMU crashes when slow VNC client disconn


From: Daniel Berrange
Subject: [Qemu-devel] [Bug 1594861] Re: QEMU crashes when slow VNC client disconnects
Date: Fri, 24 Jun 2016 15:08:12 -0000

The only place we free the mutex is in vnc_disconnect_finish() which is
only ever called from vnc_client_read(), in turn called from
vnc_client_io().

We're crashing in vnc_client_write() which is called from
vnc_client_io().

The stack trace has optimized out the "condition" param in
vnc_client_io(), but what I'm guessing is that vnc_client_io() is
invoked with both G_IO_OUT and G_IO_IN set. We process G_IO_IN, calling
vnc_disconnect_finish, and then carry on to process G_IO_OUT.  It looks
like we need to skip the G_IO_OUT processing if we called
vnc_disconnect_finish during G_IO_IN handling

-- 
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https://bugs.launchpad.net/bugs/1594861

Title:
  QEMU crashes when slow VNC client disconnects

Status in QEMU:
  New

Bug description:
  QEMU (at least 2.6.0 and today's git origin/master 
6f1d2d1c5ad20d464705b17318cb7ca495f8078a) crashes when a slow VNC client 
disconnects during a time of busy VNC updates, with:
  qemu_mutex_lock: Invalid argument

  This is easily repeatable:
    - Start up a QEMU with the Finnix 1.10 CD-ROM, as below
    - vnclient host:0 -shared  (remote X11-based vnc client, to make it "slow")
    - On the Finnix command line, run: "while :; do ls -laRC /; done" to 
generate screen updates
    - Close the vncclient
    - QEMU crashes on locking an already free'd mutex (note that the VNC 
state's share_mode is DISCONNECTED)


  # gdb qemu-system-x86_64
  GNU gdb (GDB) 7.11.1
  Copyright (C) 2016 Free Software Foundation, Inc.
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
  and "show warranty" for details.
  This GDB was configured as "x86_64-pc-linux-gnu".
  Type "show configuration" for configuration details.
  For bug reporting instructions, please see:
  <http://www.gnu.org/software/gdb/bugs/>.
  Find the GDB manual and other documentation resources online at:
  <http://www.gnu.org/software/gdb/documentation/>.
  For help, type "help".
  Type "apropos word" to search for commands related to "word"...
  Reading symbols from qemu-system-x86_64...done.
  (gdb) run -cdrom finnix-110.iso -m 1G -vga cirrus -usbdevice tablet -net 
nic,model=e1000 -net user -rtc base=localtime,clock=host -enable-kvm -vnc 
:0,share=ignore -monitor stdio
  Starting program: qemu-system-x86_64 -cdrom finnix-110.iso -m 1G -vga cirrus 
-usbdevice tablet -net nic,model=e1000 -net user -rtc base=localtime,clock=host 
-enable-kvm -vnc :0,share=ignore -monitor stdio
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/usr/lib/libthread_db.so.1".
  [New Thread 0x7ffff1ca2700 (LWP 25717)]
  Failed to initialize module: /usr/lib/qemu/block-dmg.so
  Note: only modules from the same build can be loaded.
  [New Thread 0x7ffff129d700 (LWP 25718)]
  QEMU 2.6.50 monitor - type 'help' for more information
  (qemu) [New Thread 0x7ffff08ba700 (LWP 25719)]
  [New Thread 0x7fffaabff700 (LWP 25721)]
  [Thread 0x7ffff129d700 (LWP 25718) exited]
  [New Thread 0x7ffff129d700 (LWP 25724)]
  [Thread 0x7ffff129d700 (LWP 25724) exited]
  [New Thread 0x7ffff129d700 (LWP 25728)]
  qemu: qemu_mutex_lock: Invalid argument

  Thread 1 "qemu-system-x86" received signal SIGABRT, Aborted.
  0x00007ffff48cc2a8 in raise () from /usr/lib/libc.so.6
  (gdb) thread apply all backtrace

  Thread 7 (Thread 0x7ffff129d700 (LWP 25728)):
  #0  0x00007ffff634b5f5 in do_futex_wait () from /usr/lib/libpthread.so.0
  #1  0x00007ffff634b6bf in __new_sem_wait_slow () from /usr/lib/libpthread.so.0
  #2  0x00007ffff634b772 in sem_timedwait () from /usr/lib/libpthread.so.0
  #3  0x0000555555a7fcb7 in qemu_sem_timedwait (address@hidden, address@hidden)
      at util/qemu-thread-posix.c:245
  #4  0x00005555559f281c in worker_thread (opaque=0x555556518bd0) at 
thread-pool.c:92
  #5  0x00007ffff6343424 in start_thread () from /usr/lib/libpthread.so.0
  #6  0x00007ffff4980cbd in clone () from /usr/lib/libc.so.6

  Thread 5 (Thread 0x7fffaabff700 (LWP 25721)):
  #0  0x00007ffff634903f in pthread_cond_wait@@GLIBC_2.3.2 () from 
/usr/lib/libpthread.so.0
  #1  0x0000555555a7fb69 in qemu_cond_wait (address@hidden, address@hidden)
      at util/qemu-thread-posix.c:123
  #2  0x00005555559ecb4b in vnc_worker_thread_loop (address@hidden) at 
ui/vnc-jobs.c:228
  #3  0x00005555559ed088 in vnc_worker_thread (arg=0x555556541790) at 
ui/vnc-jobs.c:335
  #4  0x00007ffff6343424 in start_thread () from /usr/lib/libpthread.so.0
  #5  0x00007ffff4980cbd in clone () from /usr/lib/libc.so.6

  Thread 4 (Thread 0x7ffff08ba700 (LWP 25719)):
  #0  0x00007ffff4979277 in ioctl () from /usr/lib/libc.so.6
  #1  0x00005555557d3484 in kvm_vcpu_ioctl (address@hidden, address@hidden)
      at kvm-all.c:2057
  #2  0x00005555557d353d in kvm_cpu_exec (address@hidden)
      at kvm-all.c:1907
  #3  0x00005555557c1ea4 in qemu_kvm_cpu_thread_fn (arg=0x55555651f2d0)
      at cpus.c:1078
  #4  0x00007ffff6343424 in start_thread () from /usr/lib/libpthread.so.0
  #5  0x00007ffff4980cbd in clone () from /usr/lib/libc.so.6

  Thread 2 (Thread 0x7ffff1ca2700 (LWP 25717)):
  #0  0x00007ffff497c7f9 in syscall () from /usr/lib/libc.so.6
  #1  0x0000555555a7fe75 in futex_wait (val=<optimized out>, ev=<optimized 
out>) at util/qemu-thread-posix.c:292
  #2  qemu_event_wait (address@hidden <rcu_call_ready_event>) at 
util/qemu-thread-posix.c:399
  #3  0x0000555555a8e26e in call_rcu_thread (opaque=<optimized out>) at 
util/rcu.c:250
  #4  0x00007ffff6343424 in start_thread () from /usr/lib/libpthread.so.0
  #5  0x00007ffff4980cbd in clone () from /usr/lib/libc.so.6

  Thread 1 (Thread 0x7ffff7f94a80 (LWP 25713)):
  #0  0x00007ffff48cc2a8 in raise () from /usr/lib/libc.so.6
  #1  0x00007ffff48cd72a in abort () from /usr/lib/libc.so.6
  #2  0x000055555579290b in error_exit (err=<optimized out>, 
      address@hidden <__func__.14707> "qemu_mutex_lock") at 
util/qemu-thread-posix.c:39
  #3  0x0000555555a7faa0 in qemu_mutex_lock (address@hidden) at 
util/qemu-thread-posix.c:66
  #4  0x00005555559da91f in vnc_lock_output (vs=0x55555655a320) at 
ui/vnc-jobs.h:62
  #5  vnc_client_write (vs=0x55555655a320) at ui/vnc.c:1361
  #6  vnc_client_io (ioc=<optimized out>, condition=<optimized out>, 
opaque=0x55555655a320) at ui/vnc.c:1483
  #7  0x00007ffff53a6dba in g_main_context_dispatch () from 
/usr/lib/libglib-2.0.so.0
  #8  0x00005555559fa6eb in glib_pollfds_poll () at main-loop.c:213
  #9  os_host_main_loop_wait (timeout=<optimized out>) at main-loop.c:258
  #10 main_loop_wait (nonblocking=<optimized out>) at main-loop.c:506
  #11 0x00005555557974a4 in main_loop () at vl.c:1925
  #12 main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) 
at vl.c:4628
  (gdb) thread 1
  [Switching to thread 1 (Thread 0x7ffff7f94a80 (LWP 25713))]
  #0  0x00007ffff48cc2a8 in raise () from /usr/lib/libc.so.6
  (gdb) frame 5
  #5  vnc_client_write (vs=0x55555655a320) at ui/vnc.c:1361
  1361      vnc_lock_output(vs);
  (gdb) set max-value-size 80000
  (gdb) print *vs
  $1 = {sioc = 0x555557b1da40, ioc = 0x555557998790, ioc_tag = 0, disconnecting 
= 0, dirty = {{0, 0, 0}, {0, 0, 0}, {
        1055221925019647, 0, 0}, {1055221925019647, 0, 0}, {773781307523071, 0, 
0}, {1125899906842623, 0, 0}, {
        1125899906842623, 0, 0}, {1125899906842623, 0, 0}, {1125899906842623, 
0, 0}, {1125899906842623, 0, 0}, {
        1125899906842623, 0, 0}, {1125899906842623, 0, 0}, {71193947300417, 0, 
0}, {71193947300433, 0, 0}, {
        71193947300417, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 
{1319379593592831, 0, 0}, {1319379593592831, 0, 0}, {
        1319379593592831, 0, 0}, {2251799813685247, 0, 0}, {2251799813685247, 
0, 0}, {2251799813685247, 0, 0}, {
        2251799813685247, 0, 0}, {2251799813685247, 0, 0}, {2251799813685247, 
0, 0}, {2251799813685247, 0, 0}, {
        106275268473665, 0, 0}, {115071496237889, 0, 0}, {106275268473665, 0, 
0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {
        381680068419649535, 0, 0}, {381680068419649535, 0, 0}, 
{309622474381721599, 0, 0}, {576460752303423487, 0, 0}, {
        576460752303423487, 0, 0}, {576460752303423487, 0, 0}, 
{576460752303423487, 0, 0}, {576460752303423487, 0, 0}, {
        576460752303423487, 0, 0}, {576460752303423487, 0, 0}, 
{106194469454161, 0, 0}, {36285762154894705, 0, 0}, {
        106194469454161, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 
{307370399690129407, 0, 0}, {307370399690129407, 0, 0}, 
      {307370399690129407, 0, 0}, {569705352862367743, 0, 0}, 
{569705352862367743, 0, 0}, {569705352862367743, 0, 0}, {
        569705352862367743, 0, 0}, {569705352862367743, 0, 0}, 
{569705352862367743, 0, 0}, {569705352862367743, 0, 0}, {
        55615324492583, 0, 0}, {36225287405246247, 0, 0}, {55615324492583, 0, 
0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {
        451468244688044031, 0, 0}, {451468244688044031, 0, 0}, 
{451468244688044031, 0, 0}, {569705352862367743, 0, 0}, {
        569705352862367743, 0, 0}, {569705352862367743, 0, 0}, 
{569705352862367743, 0, 0}, {569705352862367743, 0, 0}, {
        569705352862367743, 0, 0}, {569705352862367743, 0, 0}, {55546325181303, 
0, 0}, {36154780942280567, 0, 0}, {
        55546325181303, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 
{3406691643129069567, 0, 0}, {3406691643129069567, 0, 
        0}, {3406691643129069567, 0, 0}, {4607182418800017407, 0, 0}, 
{4607182418800017407, 0, 0}, {4607182418800017407, 
        0, 0}, {4607182418800017407, 0, 0}, {4607182418800017407, 0, 0}, 
{4607182418800017407, 0, 0}, {
        4607182418800017407, 0, 0}, {432929977792532287, 0, 0}, 
{541438925046353727, 0, 0}, {432929977792532287, 0, 0}, {
        0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {2831620673523154943, 0, 0}, 
{2831620673523154943, 0, 0}, {2831620673523154943, 
        0, 0}, {4607182418800017407, 0, 0}, {4607182418800017407, 0, 0}, 
{4607182418800017407, 0, 0}, {
        4607182418800017407, 0, 0}, {4607182418800017407, 0, 0}, 
{4607182418800017407, 0, 0}, {4607182418800017407, 0, 
        0}, {721827755353776959, 0, 0}, {830336702607599423, 0, 0}, 
{721827755353776959, 0, 0}, {0, 0, 0}, {0, 0, 0}, {
        0, 0, 0}, {1543608686381891327, 0, 0}, {1543608686381891327, 0, 0}, 
{1543045736428470271, 0, 0}, {
        4611686018427387903, 0, 0}, {4611686018427387903, 0, 0}, 
{4611686018427387903, 0, 0}, {4611686018427387903, 0, 
        0}, {4611686018427387903, 0, 0}, {4611686018427387903, 0, 0}, 
{4611686018427387903, 0, 0}, {721970826084188599, 
        0, 0}, {253878283546232247, 0, 0}, {145510073780765111, 0, 0}, {0, 0, 
0}, {0, 0, 0}, {0, 0, 0}, {
        1517695344798859263, 0, 0}, {1517695344798859263, 0, 0}, 
{1515461137171218431, 0, 0}, {4580160821035794431, 0, 
        0}, {4580160821035794431, 0, 0}, {4580160821035794431, 0, 0}, 
{4580160821035794431, 0, 0}, {4580160821035794431, 
        0, 0}, {4580160821035794431, 0, 0}, {4580160821035794431, 0, 0}, 
{226043368113417, 0, 0}, {72565387932009739, 0, 
        0}, {226043368113417, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 0, 0}, 
{1522216674051227647, 0, 0}, {1522216674051227647, 
        0, 0}, {1517713074423857151, 0, 0}, {2278821411449470975, 0, 0}, 
{2278821411449470975, 0, 0}, {
        2278821411449470975, 0, 0}, {2278821411449470975, 0, 0}, 
{2278821411449470975, 0, 0}, {2278821411449470975, 0, 
        0}, {2278821411449470975, 0, 0}, {638357209941807, 0, 0}, 
{73127235220875119, 0, 0}, {638357209941807, 0, 0}, {
        0, 0, 0}, {0, 0, 0}, {0, 0, 0}, {1873497444986126335, 0, 0}, 
{1873497444986126335, 0, 0}, {1873497376266649599, 
        0, 0}, {4611686018427387903, 0, 0}, {4611686018427387903, 0, 0}, 
{4611686018427387903, 0, 0}, {
        4611686018427387903, 0, 0}, {4611686018427387903, 0, 0}, 
{4611686018427387903, 0, 0}, {4611686018427387903, 0, 
        0}, {36244873060242763, 0, 0}, {115366073929258319, 0, 0}, 
{36244873060242763, 0, 0}, {0, 0, 0}, {0, 0, 0}, {0, 
        0, 0}, {1125899872482361343, 0, 0}, {1125899872482361343, 0, 0}, 
{1125899735043407871, 0, 0}, {
        2305843009213693951, 0, 0}, {2305843009213693951, 0, 0}, 
{2305843009213693951, 0, 0}, {2305843009213693951, 0, 
        0}, {2305843009213693951, 0, 0}, {2305843009213693951, 0, 0}, 
{2305843009213693951, 0, 0}, {325521969941073283, 
        0, 0}, {397861314371603915, 0, 0}, {325521969941073283, 0, 0}, {0, 0, 
0}, {0, 0, 0}, {0, 0, 0}, {
        1121396238495776767, 0, 0}, {1121396238495776767, 0, 0}, 
{1121396307215253503, 0, 0}, {1143914305352105983, 0, 
        0}, {1143914305352105983, 0, 0}, {1143914305352105983, 0, 0}...}, 
lossy_rect = 0x555557b1da50, 
    vd = 0x5555585000a0, need_update = 1, force_update = 0, has_dirty = 192431, 
features = 723, absolute = 1, 
    last_x = 512, last_y = 384, last_bmask = 0, client_width = 1024, 
client_height = 768, 
    share_mode = VNC_SHARE_MODE_DISCONNECTED, vnc_encoding = 7, major = 3, 
minor = 8, auth = 1, subauth = 0, 
    challenge = '\000' <repeats 15 times>, tls = 0x0, encode_ws = false, 
websocket = false, info = 0x555557976a30, 
    output = {name = 0x0, capacity = 0, offset = 0, avg_size = 4194304, buffer 
= 0x0}, input = {name = 0x0, 
      capacity = 0, offset = 0, avg_size = 524288, buffer = 0x0}, write_pixels 
= 0x5555559daae0 <vnc_write_pixels_copy>, 
    client_pf = {bits_per_pixel = 32 ' ', bytes_per_pixel = 4 '\004', depth = 
24 '\030', rmask = 16711680, 
      gmask = 65280, bmask = 255, amask = 0, rshift = 16 '\020', gshift = 8 
'\b', bshift = 0 '\000', ashift = 24 '\030', 
      rmax = 255 '\377', gmax = 255 '\377', bmax = 255 '\377', amax = 0 '\000', 
rbits = 8 '\b', gbits = 8 '\b', 
      bbits = 8 '\b', abits = 0 '\000'}, client_format = 0, client_be = false, 
audio_cap = 0x0, as = {freq = 44100, 
      nchannels = 2, fmt = AUD_FMT_S16, endianness = 0}, read_handler = 
0x5555559dbdc0 <protocol_client_msg>, 
    read_handler_expect = 1, modifiers_state = '\000' <repeats 255 times>, led 
= 0x5555572f5c40, abort = false, 
    initialized = true, output_mutex = {lock = {__data = {__lock = 0, __count = 
0, __owner = 0, __nusers = 0, 
          __kind = -1, __spins = 0, __elision = 0, __list = {__prev = 0x0, 
__next = 0x0}}, 
        __size = '\000' <repeats 16 times>, "\377\377\377\377", '\000' <repeats 
19 times>, __align = 0}}, 
    bh = 0x555557929d00, jobs_buffer = {name = 0x0, capacity = 0, offset = 0, 
avg_size = 0, buffer = 0x0}, tight = {
      type = 7, quality = 255 '\377', compression = 9 '\t', pixel24 = 1 '\001', 
tight = {name = 0x0, capacity = 0, 
        offset = 0, avg_size = 1890052, buffer = 0x0}, tmp = {name = 
0x7fff9c0d3830 "vnc-worker-output", 
        capacity = 32768, offset = 26162, avg_size = 4194304, buffer = 
0x555557786540 "\330R\303\364\377\177"}, zlib = {
        name = 0x0, capacity = 0, offset = 0, avg_size = 524288, buffer = 0x0}, 
gradient = {name = 0x0, capacity = 0, 
        offset = 0, avg_size = 0, buffer = 0x0}, jpeg = {name = 0x0, capacity = 
0, offset = 0, avg_size = 0, 
        buffer = 0x0}, png = {name = 0x0, capacity = 0, offset = 0, avg_size = 
0, buffer = 0x0}, levels = {9, 9, 9, 0}, 
      stream = {{next_in = 0x7fff9c1341f0 "", avail_in = 0, total_in = 282144, 
          next_out = 0x7fff9c0640fd 
"\256\022\352]\002\210n\021rg\b\271\v\204\334\361\001", avail_out = 4083, 
          total_out = 40323, msg = 0x0, state = 0x0, zalloc = 0x5555559deb40 
<vnc_zlib_zalloc>, 
          zfree = 0x5555559deb50 <vnc_zlib_zfree>, opaque = 0x7fffaabec3f0, 
data_type = 0, adler = 1422910222, 
          reserved = 0}, {next_in = 0x7fff9c134210 "", avail_in = 0, total_in = 
3212411, 
          next_out = 0x7fff9c0640f9 
"\377\235&\344\256\022\352]\002\210n\021rg\b\271\v\204\334\361\001", 
          avail_out = 4087, total_out = 1563572, msg = 0x0, state = 0x0, zalloc 
= 0x5555559deb40 <vnc_zlib_zalloc>, 
          zfree = 0x5555559deb50 <vnc_zlib_zfree>, opaque = 0x7fffaabec3f0, 
data_type = 0, adler = 2665424950, 
          reserved = 0}, {next_in = 0x7fff9c134440 "", avail_in = 0, total_in = 
1057759, 
          next_out = 0x7fff9c064148 ">E\025\322fI \220\262\320\322\024", 
avail_out = 4008, total_out = 83411, msg = 0x0, 
          state = 0x0, zalloc = 0x5555559deb40 <vnc_zlib_zalloc>, zfree = 
0x5555559deb50 <vnc_zlib_zfree>, 
          opaque = 0x7fffaabec3f0, data_type = 0, adler = 3032660148, reserved 
= 0}, {next_in = 0x0, avail_in = 0, 
          total_in = 0, next_out = 0x0, avail_out = 0, total_out = 0, msg = 
0x0, state = 0x0, zalloc = 0x0, zfree = 0x0, 
          opaque = 0x0, data_type = 0, adler = 0, reserved = 0}}}, zlib = {zlib 
= {name = 0x0, capacity = 0, offset = 0, 
        avg_size = 0, buffer = 0x0}, tmp = {name = 0x0, capacity = 0, offset = 
0, avg_size = 0, buffer = 0x0}, stream = {
        next_in = 0x0, avail_in = 0, total_in = 0, next_out = 0x0, avail_out = 
0, total_out = 0, msg = 0x0, state = 0x0, 
        zalloc = 0x0, zfree = 0x0, opaque = 0x0, data_type = 0, adler = 0, 
reserved = 0}, level = 0}, hextile = {
      send_tile = 0x5555559df670 <send_hextile_tile_32>}, zrle = {type = 0, fb 
= {name = 0x0, capacity = 0, offset = 0, 
        avg_size = 0, buffer = 0x0}, zrle = {name = 0x0, capacity = 0, offset = 
0, avg_size = 0, buffer = 0x0}, tmp = {
        name = 0x0, capacity = 0, offset = 0, avg_size = 0, buffer = 0x0}, zlib 
= {name = 0x0, capacity = 0, offset = 0, 
        avg_size = 0, buffer = 0x0}, stream = {next_in = 0x0, avail_in = 0, 
total_in = 0, next_out = 0x0, avail_out = 0, 
        total_out = 0, msg = 0x0, state = 0x0, zalloc = 0x0, zfree = 0x0, 
opaque = 0x0, data_type = 0, adler = 0, 
        reserved = 0}, palette = {pool = {{idx = 0, color = 0, next = {le_next 
= 0x0, 
              le_prev = 0x0}} <repeats 256 times>}, size = 0, max = 0, bpp = 0, 
table = {{
            lh_first = 0x0} <repeats 256 times>}}}, zywrle = {buf = {0 <repeats 
4096 times>}}, mouse_mode_notifier = {
      notify = 0x5555559db450 <check_pointer_type_change>, node = {le_next = 
0x0, 
        le_prev = 0x5555560586f8 <mouse_mode_notifiers>}}, next = {tqe_next = 
0x0, tqe_prev = 0x5555585000a0}}


  QEMU build config:

  Install prefix    /usr
  BIOS directory    /usr/share/qemu
  binary directory  /usr/bin
  library directory /usr/lib
  module directory  /usr/lib/qemu
  libexec directory /usr/lib/qemu
  include directory /usr/include
  config directory  /etc
  local state directory   /var
  Manual directory  /usr/share/man
  ELF interp prefix /usr/gnemul/qemu-%M
  Source path       /home/me/build/qemu/src/qemu-git
  C compiler        cc
  Host C compiler   cc
  C++ compiler      c++
  Objective-C compiler cc
  ARFLAGS           rv
  CFLAGS            -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -pthread 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -pthread 
-I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -g -march=x86-64 
-mtune=generic -O2 -pipe -fstack-protector-strong -fPIC
  QEMU_CFLAGS       -I/usr/include/pixman-1  -Werror -fPIE -DPIE -m64 
-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes 
-Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes 
-fno-strict-aliasing -fno-common  -Wendif-labels -Wmissing-include-dirs 
-Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self 
-Wignored-qualifiers -Wold-style-declaration -Wold-style-definition 
-Wtype-limits -fstack-protector-strong   -I/usr/include/libpng16 
-I/usr/include/spice-server -I/usr/include/cacard -I/usr/include/nss 
-I/usr/include/nspr -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include 
-I/usr/include/pixman-1 -I/usr/include/spice-1 -I/usr/include/libusb-1.0
  LDFLAGS           -Wl,--warn-common -Wl,-z,relro -Wl,-z,now -pie -m64 -g 
-Wl,-O1,--sort-common,--as-needed,-z,relro
  make              make
  install           install
  python            /usr/bin/python2 -B
  smbd              /usr/sbin/smbd
  module support    yes
  host CPU          x86_64
  host big endian   no
  target list       x86_64-softmmu i386-softmmu
  tcg debug enabled no
  gprof enabled     no
  sparse enabled    no
  strip binaries    yes
  profiler          no
  static build      no
  pixman            system
  SDL support       yes (1.2.15)
  GTK support       no 
  GTK GL support    no
  VTE support       no 
  GNUTLS support    no
  GNUTLS hash       no
  GNUTLS rnd        no
  libgcrypt         no
  libgcrypt kdf     no
  nettle            no 
  nettle kdf        no
  libtasn1          yes
  curses support    yes
  virgl support     no
  curl support      no
  mingw32 support   no
  Audio drivers     sdl
  Block whitelist (rw) 
  Block whitelist (ro) 
  VirtFS support    no
  VNC support       yes
  VNC SASL support  no
  VNC JPEG support  yes
  VNC PNG support   yes
  xen support       no
  brlapi support    no
  bluez  support    no
  Documentation     yes
  PIE               yes
  vde support       yes
  netmap support    no
  Linux AIO support yes
  ATTR/XATTR support yes
  Install blobs     yes
  KVM support       yes
  RDMA support      no
  TCG interpreter   no
  fdt support       no
  preadv support    yes
  fdatasync         yes
  madvise           yes
  posix_madvise     yes
  uuid support      yes
  libcap-ng support yes
  vhost-net support yes
  vhost-scsi support yes
  Trace backends    nop
  spice support     yes (0.12.10/0.12.6)
  rbd support       no
  xfsctl support    yes
  smartcard support no
  libusb            yes
  usb net redir     no
  OpenGL support    no
  OpenGL dmabufs    no
  libiscsi support  no
  libnfs support    no
  build guest agent no
  QGA VSS support   no
  QGA w32 disk info no
  QGA MSI support   no
  seccomp support   yes
  coroutine backend ucontext
  coroutine pool    yes
  GlusterFS support no
  Archipelago support no
  gcov              gcov
  gcov enabled      no
  TPM support       yes
  libssh2 support   no
  TPM passthrough   yes
  QOM debugging     yes
  vhdx              no
  lzo support       no
  snappy support    no
  bzip2 support     no
  NUMA host support yes
  tcmalloc support  no
  jemalloc support  no
  avx2 optimization yes

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