[vbox-dev] Bugs spotted when using VirtualBox 6.1.97 r140059.

[Cyrax]

1. Audio issues. When using PulseAudio driver in guets, VirtualBox 
6.1.97 r140059 creates several playback streams in the host OS and none 
will output any sounds. Switching to ALSA driver, I get sound but 
somehow changing other Guests volume affects other one.

2. Taking a snapshot aborts running guest. This happened to Windows 
Guest of mine. Attached two files which one is output from "coredumpctl 
info" and the log file of the guest (VBox.log)
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           PID: 221912 (VirtualBoxVM)
           UID: 1000 (john)
           GID: 1000 (john)
        Signal: 6 (ABRT)
     Timestamp: Thu 2020-08-27 11:23:49 +03 (3h 16min ago)
  Command Line: /opt/VirtualBox/VirtualBoxVM --comment Windows Server 2008 R2 SP1 3 Clone --startvm 092ad7eb-5ecc-4fba-ac0e-2b2d83bf830c --no-startvm-errormsgbox
    Executable: /opt/VirtualBox/VirtualBoxVM
 Control Group: /user.slice/user-1000.slice/session-1.scope
          Unit: session-1.scope
         Slice: user-1000.slice
       Session: 1
     Owner UID: 1000 (john)
       Boot ID: dc05bd83f7b2404a906e4b3b9c320e14
    Machine ID: cb60c5e56a7b4166b6d53a26733978f8
      Hostname: shodan
       Storage: /var/lib/systemd/coredump/core.VirtualBoxVM.1000.dc05bd83f7b2404a906e4b3b9c320e14.221912.1598516629000000000000.zst
       Message: Process 221912 (VirtualBoxVM) of user 1000 dumped core.
                
                Stack trace of thread 1392421:
                #0  0x00007fc5fb4a1615 raise (libc.so.6 + 0x3d615)
                #1  0x00007fc5fb48a862 abort (libc.so.6 + 0x26862)
                #2  0x00007fc5fb4e35e8 __libc_message (libc.so.6 + 0x7f5e8)
                #3  0x00007fc5fb4eb27a malloc_printerr (libc.so.6 + 0x8727a)
                #4  0x00007fc5fb4f046c __malloc_arena_thread_freeres (libc.so.6 + 0x8c46c)
                #5  0x00007fc5fb819401 start_thread (libpthread.so.0 + 0x9401)
                #6  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221919:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221926:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221918:
                #0  0x00007fc5fb55946f __poll (libc.so.6 + 0xf546f)
                #1  0x00007fc5f8eaade0 _xcb_conn_wait (libxcb.so.1 + 0xcde0)
                #2  0x00007fc5f8ead61f xcb_wait_for_event (libxcb.so.1 + 0xf61f)
                #3  0x00007fc5efda32a1 n/a (libQt5XcbQpaVBox.so.5 + 0x3b2a1)
                #4  0x00007fc5f8150633 n/a (libQt5CoreVBox.so.5 + 0xc5633)
                #5  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #6  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221921:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221928:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221925:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 221927:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5ed8b8558 cnd_wait (radeonsi_dri.so + 0x6c8558)
                #2  0x00007fc5ed8b8ed3 util_queue_thread_func (radeonsi_dri.so + 0x6c8ed3)
                #3  0x00007fc5ed8b8467 impl_thrd_routine (radeonsi_dri.so + 0x6c8467)
                #4  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e9)
                #5  0x00007fc5fb564293 __clone (libc.so.6 + 0x100293)
                
                Stack trace of thread 222058:
                #0  0x00007fc5fb81f6a2 pthread_cond_wait@@GLIBC_2.3.2 (libpthread.so.0 + 0xf6a2)
                #1  0x00007fc5fac7b92e RTSemEventWait (VBoxRT.so + 0x2ce92e)
                #2  0x00007fc5b4ca30b6 n/a (VBoxC.so + 0x2520b6)
                #3  0x00007fc5b4ca3b63 n/a (VBoxC.so + 0x252b63)
                #4  0x00007fc5b4ca6885 n/a (VBoxC.so + 0x255885)
                #5  0x00007fc5b4ca36e8 n/a (VBoxC.so + 0x2526e8)
                #6  0x00007fc5fabbdc8c n/a (VBoxRT.so + 0x210c8c)
                #7  0x00007fc5fac793f1 n/a (VBoxRT.so + 0x2cc3f1)
                #8  0x00007fc5fb8193e9 start_thread (libpthread.so.0 + 0x93e
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