debugging threads

["Heyendal, Carl" <CHeyendal at stanleyworks dot com>]

Hi,

I'm having trouble debugging threads remotely with Eclipse/GDB. 

I can set breakpoints and step with Eclipse with no problems when I only have one main loop, but as soon as I add a thread, set a break point in the thread, and then step once after the breakpoint, GDB gets confused and stops running....indicating this message: "Cannot find bounds of current function". You can see this message at the bottom of the GDB output below.

When I run my small test app standalone without GDB, the app runs fine to completion. So I'm assuming there's a problem with my libs when debugging. I have double checked that I point to sys-root on the host filesystem, and that the pthread lib is on both the host and the target filesystems. Also, all the libs are NOT stripped.

Note below that on line 456,245 when it hits a break point in the thread it doesn't know what function it's in. Just before that however when it hit the breakpoint, it did know that it was in the new thread by name.

I'm using crosstools-ng 1.5.2 which I know it's a bit old but it should work.

Appreciate any help.

thanx
/carl h.



442,165 1source ~/.gdbinit
442,166 &"source ~/.gdbinit\n"
442,177 1^done
442,177 (gdb) 
442,178 2-file-exec-and-symbols /home/heyendal/build/projects/CM/hello/hello
442,180 2^done
442,180 (gdb) 
442,181 3-environment-cd /home/heyendal/build/projects/CM/hello
442,181 3^done
442,181 (gdb) 
442,186 4-gdb-set auto-solib-add on
442,186 4^done
442,186 (gdb) 
442,187 5-gdb-set solib-search-path /usr/local/xtools/arm-unknown-linux-uclibcgnueabi/arm-unknown-li\
nux-uclibcgnueabi/sys-root/lib
442,187 5^done
442,187 (gdb) 
442,188 6-environment-directory /home/heyendal/build/projects/CM/hello /home/heyendal/build/projects\
/CM/hello/.settings
442,189 6^done,source-path="/home/heyendal/build/projects/CM/hello:/home/heyendal/build/projects/CM/\
hello/.settings:$cdir:$cwd"
442,189 (gdb) 
442,190 7-target-select remote 192.168.52.167:5001
442,203 ~"[New Thread 336]\n"
442,222 7^connected,thread-id="1",frame={addr="0x400009e0",func="_start",args=[],from="/usr/local/xt\
ools/arm-unknown-linux-uclibcgnueabi/arm-unknown-linux-uclibcgnueabi/sys-root/lib/ld-uClibc.so.0"}
442,223 (gdb) 
442,224 8-break-insert -t main
442,226 8^done,bkpt={number="1",type="breakpoint",disp="del",enabled="y",addr="0x000086e8",func="mai\
n",file="hello.c",fullname="/home/heyendal/build/projects/CM/hello/hello.c",line="21",times="0"}
442,226 (gdb) 
442,228 9-exec-continue
442,228 9^running
442,230 (gdb) 
442,363 9*stopped,thread-id="1",frame={addr="0x000086e8",func="main",args=[],file="hello.c",fullname\
="/home/heyendal/build/projects/CM/hello/hello.c",line="21"}
442,363 (gdb) 
442,382 10-thread-list-ids
442,386 10^done,thread-ids={thread-id="1"},number-of-threads="1"
442,387 (gdb) 
442,420 11-thread-select 1
442,420 12-stack-info-depth 11
442,422 11^done,new-thread-id="1",frame={level="0",addr="0x000086e8",func="main",args=[],file="hello\
.c",fullname="/home/heyendal/build/projects/CM/hello/hello.c",line="21"}
442,423 (gdb) 
442,423 12^done,depth="1"
442,424 (gdb) 
442,425 13-stack-list-frames
442,425 13^done,stack=[frame={level="0",addr="0x000086e8",func="main",file="hello.c",fullname="/home\
/heyendal/build/projects/CM/hello/hello.c",line="21"}]
442,425 (gdb) 
442,628 14info threads
442,629 &"info threads\n"
442,651 ~"* 1 Thread 336  main () at hello.c:21\n"
442,652 14^done
442,652 (gdb) 
449,292 15-break-insert /home/heyendal/build/projects/CM/hello/hello.c:48
449,292 15^done,bkpt={number="2",type="breakpoint",disp="keep",enabled="y",addr="0x00008794",func="h\
ello_thread_main",file="hello.c",fullname="/home/heyendal/build/projects/CM/hello/hello.c",line="48"\
,times="0"}
449,292 (gdb) 
450,969 16-exec-continue
450,970 16^running
450,973 (gdb) 
456,004 ~"[New Thread 338]\n"
456,007 ~"[Switching to Thread 338]\n"
456,020 16*stopped,reason="breakpoint-hit",bkptno="2",thread-id="2",frame={addr="0x00008794",func="h\
ello_thread_main",args=[],file="hello.c",fullname="/home/heyendal/build/projects/CM/hello/hello.c",l\
ine="48"}
456,020 (gdb) 
456,229 17-thread-select 1
456,230 18-stack-info-depth 11
456,245 17^done,new-thread-id="1",frame={level="0",addr="0x400365b8",func="??",args=[]}
456,246 (gdb) 
456,267 18^done,depth="1"
456,267 (gdb) 
493,200 19-exec-next 1
493,201 19^running
493,205 (gdb) 
493,205 &"Cannot find bounds of current function\n"
493,205 19^error,msg="Cannot find bounds of current function"
493,205 (gdb)


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