When I start powerdebug and press Enter on the empty clocks tab,
I get a crash (SIGSEGV). If the backtrace below is not useful,
please close this bug report.

$ gdb -batch -n -ex 'set pagination off' -ex bt -ex 'thread apply all bt full' --core /var/crash/0/11643-0-0-11-1508729964-chianamo--usr-sbin-powerdebug.core /usr/sbin/powerdebug
[New LWP 11643]
Core was generated by `powerdebug'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x000055a266bd66f9 in display_get_row_data (win=win@entry=0) at display.c:156
156	display.c: No such file or directory.
#0  0x000055a266bd66f9 in display_get_row_data (win=win@entry=0) at display.c:156
#1  0x000055a266bd4b37 in clock_select () at clocks.c:325
#2  0x000055a266bd6c10 in display_select () at display.c:162
#3  display_keystroke (fd=0, data=<optimized out>) at display.c:417
#4  0x000055a266bd76fd in mainloop (timeout=10000) at mainloop.c:56
#5  0x000055a266bd423a in powerdebug_display (options=0x55a26760a010) at powerdebug.c:198
#6  main (argc=<optimized out>, argv=0x7ffdda833c38) at powerdebug.c:269

Thread 1 (LWP 11643):
#0  0x000055a266bd66f9 in display_get_row_data (win=win@entry=0) at display.c:156
No locals.
#1  0x000055a266bd4b37 in clock_select () at clocks.c:325
        t = <optimized out>
        clk = <optimized out>
#2  0x000055a266bd6c10 in display_select () at display.c:162
No locals.
#3  display_keystroke (fd=0, data=<optimized out>) at display.c:417
        keystroke = 13
#4  0x000055a266bd76fd in mainloop (timeout=10000) at mainloop.c:56
        i = <optimized out>
        nfds = <optimized out>
        events = {{events = 1, data = {ptr = 0x55a26761a710, fd = 1734453008, u32 = 1734453008, u64 = 94156007515920}}, {events = 32635, data = {ptr = 0x38, fd = 56, u32 = 56, u64 = 56}}, {events = 1723687304, data = {ptr = 0xb9000055a2, fd = 21922, u32 = 21922, u64 = 794568971682}}, {events = 0, data = {ptr = 0xb9, fd = 185, u32 = 185, u64 = 185}}, {events = 0, data = {ptr = 0x66bd4f1b00000000, fd = 0, u32 = 0, u64 = 7403160339849674752}}, {events = 21922, data = {ptr = 0x0, fd = 0, u32 = 0, u64 = 0}}, {events = 1740842608, data = {ptr = 0x66dda540000055a2, fd = 21922, u32 = 21922, u64 = 7412262256018216354}}, {events = 21922, data = {ptr = 0x55a266bd5f6d <display_refresh+63>, fd = 1723686765, u32 = 1723686765, u64 = 94155996749677}}, {events = 1725801792, data = {ptr = 0x66bd6ec2000055a2, fd = 21922, u32 = 21922, u64 = 7403195141969696162}}, {events = 21922, data = {ptr = 0x7ffdda833c30, fd = -628933584, u32 = 3666033712, u64 = 140728269487152}}}
        md = <optimized out>
#5  0x000055a266bd423a in powerdebug_display (options=0x55a26760a010) at powerdebug.c:198
No locals.
#6  main (argc=<optimized out>, argv=0x7ffdda833c38) at powerdebug.c:269
        ret = <optimized out>