[Bug 260910] lldb crash on amd64 with "bt all" in threaded program that generates SIGBUS.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=260910

            Bug ID: 260910
           Summary: lldb crash on amd64 with "bt all" in threaded program
                    that generates SIGBUS.
           Product: Base System
           Version: 13.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: freebsd@monkeyspunk.net

lldb asked me to submit this bug report so I am.   I am debugging some
modifications I'm making to fluent-bit.  fluent-bit is a threaded C program.

The FreeBSD box is running under KVM (up to date Ubuntu 20.04 host) on
workstation hardware with ECC RAM.

I've had lldb crash on me a few times now.  Below is the latest output from the
full run minus the program output.


#  lldb --arch x86_64 -- /usr/local/bin/fluent-bit -c
/usr/local/etc/fluent-bit/fluent-bit.conf -s 4096
(lldb) target create --arch=x86_64 "/usr/local/bin/fluent-bit"
Current executable set to '/usr/local/bin/fluent-bit' (x86_64).
(lldb) settings set -- target.run-args  "-c"
"/usr/local/etc/fluent-bit/fluent-bit.conf" "-s" "4096"
(lldb) run
Process 16204 launching
Process 16204 launched: '/usr/local/bin/fluent-bit' (x86_64)

.... fluent-bit output .....

Process 16204 stopped
* thread #2, name = 'fluent-bit', stop reason = signal SIGBUS: hardware error
    frame #0: 0x0000000800c28945
libc.so.7`files_servent(retval=0x0000000801a6e400, mdata=0x0000000800f92210,
ap=0x0000000801a6e400) at getservent.c:281:26
(lldb) bt all
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to
being destroyed).
PLEASE submit a bug report to https://bugs.freebsd.org/submit/ and include the
crash backtrace.
Stack dump:
0.      Program arguments: lldb --arch x86_64 -- /usr/local/bin/fluent-bit -c
/usr/local/etc/fluent-bit/fluent-bit.conf -s 4096 
1.      HandleCommand(command = "bt all")
2.      HandleCommand(command = "thread backtrace all")
#0 0x0000000003ae7aee PrintStackTrace
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
#1 0x0000000003ae5fa5 RunSignalHandlers
/usr/src/contrib/llvm-project/llvm/lib/Support/Signals.cpp:69:18
#2 0x0000000003ae8060 SignalHandler
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#3 0x0000000804c35e00 handle_signal /usr/src/lib/libthr/thread/thr_sig.c:0:3
Abort trap

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