ken@astro-vm:~$ gdb --eval-command="set follow-fork-mode child" --args indiserver -v indi_tcfs_focus indi_asi_ccd
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Reading symbols from indiserver...(no debugging symbols found)...done.
(gdb) run
Starting program: /usr/bin/indiserver -v indi_tcfs_focus indi_asi_ccd
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
2017-10-31T13:11:50: startup: /usr/bin/indiserver -v indi_tcfs_focus indi_asi_ccd 
2017-10-31T13:11:50: Driver indi_tcfs_focus: pid=18528 rfd=3 wfd=6 efd=7
2017-10-31T13:11:50: Driver indi_asi_ccd: pid=18529 rfd=4 wfd=9 efd=10
2017-10-31T13:11:50: listening to port 7624 on fd 5
[New process 18528]
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
process 18528 is executing new program: /usr/bin/indi_tcfs_focus
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on Telescope Simulator.EQUATORIAL_EOD_COORD
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on Telescope Simulator.TELESCOPE_INFO
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on Telescope Simulator.GEOGRAPHIC_COORD
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on Focuser Simulator.ABS_ROTATOR_ANGLE
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on CCD Simulator.FILTER_SLOT
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on CCD Simulator.FILTER_NAME
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on SQM.SKY_QUALITY
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on EQMod Mount.EQUATORIAL_EOD_COORD
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on EQMod Mount.TELESCOPE_INFO
2017-10-31T13:11:50: Driver indi_asi_ccd: snooping on EQMod Mount.GEOGRAPHIC_COORD
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Thread 2.1 "indi_tcfs_focus" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7fb0740 (LWP 18528)]
0x000055555555872b in TCFS::ISNewSwitch(char const*, char const*, ISState*, char**, int) ()
(gdb) bt
#0  0x000055555555872b in TCFS::ISNewSwitch(char const*, char const*, ISState*, char**, int) ()
#1  0x0000555555556bec in ISNewSwitch ()
#2  0x00007ffff7ab974f in dispatch ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#3  0x00007ffff7ab9fc5 in IUReadConfig ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#4  0x00007ffff7ac4404 in INDI::DefaultDevice::loadConfig(bool, char const*) ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#5  0x00007ffff7b0d733 in Connection::Serial::Activated() ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#6  0x00007ffff7ac4196 in INDI::DefaultDevice::ISGetProperties(char const*) ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#7  0x00007ffff7afa29b in INDI::Focuser::ISGetProperties(char const*) ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#8  0x0000555555558169 in TCFS::ISGetProperties(char const*) ()
#9  0x0000555555556b9f in ISGetProperties ()
#10 0x00007ffff7ab90ca in dispatch ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#11 0x00007ffff7ab9dc2 in clientMsgCB ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#12 0x00007ffff7aba81d in ?? ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
---Type <return> to continue, or q <return> to quit---
#13 0x00007ffff7aba85a in eventLoop ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#14 0x00007ffff7aba4b4 in main ()
   from /usr/lib/x86_64-linux-gnu/libindidriver.so.1
#15 0x00007ffff7148830 in __libc_start_main (main=0x7ffff7aba3a0 <main>, 
    argc=1, argv=0x7fffffffdef8, init=<optimised out>, fini=<optimised out>, 
    rtld_fini=<optimised out>, stack_end=0x7fffffffdee8)
    at ../csu/libc-start.c:291
#16 0x00005555555569b9 in _start ()
(gdb)