scripts/gdb: received an error when invoking lx-symbols

scripts/gdb: received an error when invoking lx-symbols

[Stefano Garzarella]

Hi Jan, Kieran,
with the last Linux 5.8-rc6 I have some problems with gdb scripts.
Everything is fine with Linux 5.7.

When I call lx-symbols, I received this error while loading modules
symbols:

    (gdb) set python print-stack full
    (gdb) target remote :1234
    Remote debugging using :1234
    arch_atomic_read (v=<optimized out>) at ../arch/x86/kernel/process.c:687
    687		trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
    (gdb) lx-symbols 
    loading vmlinux
    scanning for modules in /home/stefano/repos/linux_vsock/build-tiny-config
    loading @0xffffffffc0169000: /home/stefano/repos/linux_vsock/build-tiny-config/drivers/net/tun.ko
    Traceback (most recent call last):
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 174, in invoke
        self.load_all_symbols()
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in load_all_symbols
        [self.load_module_symbols(module) for module in module_list]
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in <listcomp>
        [self.load_module_symbols(module) for module in module_list]
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 131, in load_module_symbols
        sections=self._section_arguments(module))
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 98, in _section_arguments
        section_name_to_address = {
      File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 99, in <dictcomp>
        attrs[n]['name'].string(): attrs[n]['address']
    gdb.error: There is no member named name.
    Error occurred in Python: There is no member named name.

I'll try to bisect.

Thanks,
Stefano

Re: scripts/gdb: received an error when invoking lx-symbols

[Jan Kiszka]

On 22.07.20 11:13, Stefano Garzarella wrote:
> Hi Jan, Kieran,
> with the last Linux 5.8-rc6 I have some problems with gdb scripts.
> Everything is fine with Linux 5.7.
> 
> When I call lx-symbols, I received this error while loading modules
> symbols:
> 
>      (gdb) set python print-stack full
>      (gdb) target remote :1234
>      Remote debugging using :1234
>      arch_atomic_read (v=<optimized out>) at ../arch/x86/kernel/process.c:687
>      687		trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
>      (gdb) lx-symbols
>      loading vmlinux
>      scanning for modules in /home/stefano/repos/linux_vsock/build-tiny-config
>      loading @0xffffffffc0169000: /home/stefano/repos/linux_vsock/build-tiny-config/drivers/net/tun.ko
>      Traceback (most recent call last):
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 174, in invoke
>          self.load_all_symbols()
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in load_all_symbols
>          [self.load_module_symbols(module) for module in module_list]
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in <listcomp>
>          [self.load_module_symbols(module) for module in module_list]
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 131, in load_module_symbols
>          sections=self._section_arguments(module))
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 98, in _section_arguments
>          section_name_to_address = {
>        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 99, in <dictcomp>
>          attrs[n]['name'].string(): attrs[n]['address']
>      gdb.error: There is no member named name.
>      Error occurred in Python: There is no member named name.
> 
> I'll try to bisect.

Dig for changes in the data structure (module_sect_attr).

Jan

-- 
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

Re: scripts/gdb: received an error when invoking lx-symbols

[Stefano Garzarella]

On Wed, Jul 22, 2020 at 11:19:42AM +0200, Jan Kiszka wrote:
> On 22.07.20 11:13, Stefano Garzarella wrote:
> > Hi Jan, Kieran,
> > with the last Linux 5.8-rc6 I have some problems with gdb scripts.
> > Everything is fine with Linux 5.7.
> > 
> > When I call lx-symbols, I received this error while loading modules
> > symbols:
> > 
> >      (gdb) set python print-stack full
> >      (gdb) target remote :1234
> >      Remote debugging using :1234
> >      arch_atomic_read (v=<optimized out>) at ../arch/x86/kernel/process.c:687
> >      687		trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
> >      (gdb) lx-symbols
> >      loading vmlinux
> >      scanning for modules in /home/stefano/repos/linux_vsock/build-tiny-config
> >      loading @0xffffffffc0169000: /home/stefano/repos/linux_vsock/build-tiny-config/drivers/net/tun.ko
> >      Traceback (most recent call last):
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 174, in invoke
> >          self.load_all_symbols()
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in load_all_symbols
> >          [self.load_module_symbols(module) for module in module_list]
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 161, in <listcomp>
> >          [self.load_module_symbols(module) for module in module_list]
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 131, in load_module_symbols
> >          sections=self._section_arguments(module))
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 98, in _section_arguments
> >          section_name_to_address = {
> >        File "/home/stefano/repos/linux_vsock/build-tiny-config/scripts/gdb/linux/symbols.py", line 99, in <dictcomp>
> >          attrs[n]['name'].string(): attrs[n]['address']
> >      gdb.error: There is no member named name.
> >      Error occurred in Python: There is no member named name.
> > 
> > I'll try to bisect.
> 
> Dig for changes in the data structure (module_sect_attr).

Thanks for the hint, I think I found the problem, I'll send a patch :-)

Stefano