tls crash

mark.janssen [~/Downloads/tcltls-1.7.13]$ sudo gdb --args tclsh8.6 crash.tcl
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Reading symbols from tclsh8.6...done.
(gdb) run
Starting program: /usr/local/opt/tclsrc/bin/tclsh8.6 crash.tcl
[New Thread 0x1903 of process 61336]
warning: unhandled dyld version (15)
[New Thread 0x1707 of process 61336]
[New Thread 0x1a03 of process 61336]
[New Thread 0x1b03 of process 61336]

Thread 2 received signal SIGILL, Illegal instruction.
0x00007fffc5f95e97 in ?? ()
(gdb) thread apply all bt

Thread 5 (Thread 0x1b03 of process 61336):
#0  0x00007fffc5e9244e in ?? ()
#1  0x00007fffc5f7c621 in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x1a03 of process 61336):
#0  0x00007fffc5e9244e in ?? ()
#1  0x00007fffc5f7c48e in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 3 (Thread 0x1707 of process 61336):
#0  0x00007fffc5e9244e in ?? ()
#1  0x00007fffc5f7c621 in ?? ()
#2  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x1903 of process 61336):
#0  0x00007fffc5f95e97 in ?? ()
#1  0x6332945506e7235b in ?? ()
#2  0xc631aeafe79d0786 in ?? ()
#3  0x0000000102800000 in ?? ()
#4  0x0000000000000000 in ?? ()