Re: gdb eats 100% cpu for relative long time when I single step one instruction

[Thomas Glanzmann <sithglan at stud dot uni-erlangen dot de>]

Hello,

> These are just display panes.  It sounds like something is broken
> inside the TUI.  You'll have to build a debuggable GDB and attach
> another gdb to it to see what it's spinning on.

I made a screenshot[1]. I guess that every time I do a single step gdb
tries to analyze the jzero_far function he thinks I am in. He also says 
jzero_far+1846439. But if this doesn't help I can attach.

I executed 'ni' in the gdb window and attached

	strace -o dbg -fp `pidof gdb`

And he does:

(excalibur) [~] cat dbg
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d14, [0x49e94050]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0xb7fd0ce0, [0xb74400c0]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d14, [0x49e94050]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d18, [0x90fffffd]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0xb7fd0ce0, [0xb74400c0]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d18, [0x90fffffd]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0xb7fd0ce0, [0xb74400c0]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d1c, [0xff08458b]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0xb7fd0ce0, [0xb74400c0]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d1c, [0xff08458b]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0xb7fd0ce0, [0xb74400c0]) = 0
1317  ptrace(PTRACE_PEEKTEXT, 1318, 0x8249d1c, [0xff08458b]) = 0
...

(excalibur) [~] wc -l dbg
1728579 dbg

And I started the ptrace *after* I typed 'ni' in and interrupted it before 'ni'
came back:

	Thomas

[1] gdb screenshot
	http://wwwcip.informatik.uni-erlangen.de/~sithglan/shot1.png