[Bug 1978521] brltty crashed with SIGSEGV in runSpeechDriverThread()

[Apport retracing service]

StacktraceTop:
 asyncDiscardEvent (event=0x0) at ../../Programs/async_event.c:147
 runSpeechDriverThread (argument=0x5642f4c2b890) at ../../Programs/spk_thread.c:842
 runThread (argument=0x5642f4c2bb80) at ../../Programs/thread.c:46
 start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
 clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81

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https://bugs.launchpad.net/bugs/1978521

Title:
  brltty crashed with SIGSEGV in asyncDiscardEvent()

Status in brltty package in Ubuntu:
  Confirmed

Bug description:
  this problem occurs recurring on every boot

  ProblemType: Crash
  DistroRelease: Ubuntu 22.10
  Package: brltty 6.4-6ubuntu1
  ProcVersionSignature: Ubuntu 5.15.0-27.28-generic 5.15.30
  Uname: Linux 5.15.0-27-generic x86_64
  ApportVersion: 2.21.0-0ubuntu2
  Architecture: amd64
  CasperMD5CheckResult: pass
  CrashCounter: 1
  Date: Tue Jun 14 06:24:44 2022
  ExecutablePath: /usr/bin/brltty
  InstallationDate: Installed on 2022-05-14 (30 days ago)
  InstallationMedia: Ubuntu 22.10 "Kinetic Kudu" - Alpha amd64 (20220512)
  ProcCmdline: /bin/brltty --no-daemon
  SegvAnalysis:
   Segfault happened at: 0x5642f400ee48 <runSpeechDriverThread+152>:	mov    0x20(%rbp),%rdi
   PC (0x5642f400ee48) ok
   source "0x20(%rbp)" (0x00000020) not located in a known VMA region (needed readable region)!
   destination "%rdi" ok
   Stack memory exhausted (SP below stack segment)
  SegvReason: reading NULL VMA
  Signal: 11
  SourcePackage: brltty
  StacktraceTop:
   runSpeechDriverThread ()
   ?? ()
   start_thread (arg=<optimized out>) at ./nptl/pthread_create.c:442
   clone3 () at ../sysdeps/unix/sysv/linux/x86_64/clone3.S:81
  Title: brltty crashed with SIGSEGV in runSpeechDriverThread()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: N/A
  separator:

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