Re: how can i stop a running process to do a backtrace?

[Jelle de Jong <jelledejong@powercraft.nl>]

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Daniel Jacobowitz wrote:
> On Sat, Jul 19, 2008 at 04:57:16PM +0200, Jelle de Jong wrote:
>> (gdb) continue
>> # ok how to stop the continue command so i can do a backtrace?
>> # kill 1948 wil stop the process but leaves no traceabale info
> 
> What does it show in GDB after you do this?
> 
> It sounds like you're out of luck.  WHen programs, like fuse, go in
> and out of the kernel it is sometimes impossible for GDB to regain
> control.

Thank you for your fast response, I attached my logfile i created
yesterday.

After the sshfs froze i did a killall -9 sshfs and run the next gdb
commands.

Best regards,

Jelle


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GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu".
(gdb) handle SIG33 pass nostop noprint
Signal        Stop	Print	Pass to program	Description
SIG33         No	No	Yes		Real-time event 33
(gdb) set pagination 0
(gdb) attach 2312
Attaching to process 2312
Reading symbols from /usr/bin/sshfs...Reading symbols from /usr/lib/debug/usr/bin/sshfs...done.
done.
Reading symbols from /usr/lib/libfuse.so.2...done.
Loaded symbols for /usr/lib/libfuse.so.2
Reading symbols from /lib/i686/cmov/libdl.so.2...done.
Loaded symbols for /lib/i686/cmov/libdl.so.2
Reading symbols from /usr/lib/libgthread-2.0.so.0...done.
Loaded symbols for /usr/lib/libgthread-2.0.so.0
Reading symbols from /lib/i686/cmov/librt.so.1...done.
Loaded symbols for /lib/i686/cmov/librt.so.1
Reading symbols from /usr/lib/libglib-2.0.so.0...done.
Loaded symbols for /usr/lib/libglib-2.0.so.0
Reading symbols from /lib/i686/cmov/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread 0xb7d36960 (LWP 2312)]
[New Thread 0xb7d13b90 (LWP 2313)]
Loaded symbols for /lib/i686/cmov/libpthread.so.0
Reading symbols from /lib/i686/cmov/libc.so.6...done.
Loaded symbols for /lib/i686/cmov/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libselinux.so.1...done.
Loaded symbols for /lib/libselinux.so.1
Reading symbols from /usr/lib/libpcre.so.3...done.
Loaded symbols for /usr/lib/libpcre.so.3
0xb7fde424 in __kernel_vsyscall ()
(gdb) continue
Continuing.

Program terminated with signal SIGKILL, Killed.
The program no longer exists.
(gdb) backtrace full
No stack.
(gdb) info registers
The program has no registers now.
(gdb) thread apply all backtrace
No registers.
(gdb) quit