path: root/results/scraper/launchpad-without-comments/1594861

QEMU crashes when slow VNC client disconnects

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>
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and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
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For help, type "help".
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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 (sem=sem@entry=0x555556518c38, ms=ms@entry=10000)
    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 (cond=cond@entry=0x555556541790, mutex=mutex@entry=0x5555565417c0)
    at util/qemu-thread-posix.c:123
#2  0x00005555559ecb4b in vnc_worker_thread_loop (queue=queue@entry=0x555556541790) 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 (cpu=cpu@entry=0x55555651f2d0, type=type@entry=44672)
    at kvm-all.c:2057
#2  0x00005555557d353d in kvm_cpu_exec (cpu=cpu@entry=0x55555651f2d0)
    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 (ev=ev@entry=0x55555646bb64 <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>, 
    msg=msg@entry=0x555555b59d30 <__func__.14707> "qemu_mutex_lock") at util/qemu-thread-posix.c:39
#3  0x0000555555a7faa0 in qemu_mutex_lock (mutex=mutex@entry=0x555556566568) 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