Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
On Wed, Oct 17, 2018 at 08:56:44AM +0200, Jan Kiszka wrote: > On 17.10.18 04:36, Du Changbin wrote: > > For gdb version less than 7.3, lx-version only one character. > > ^^^ prints? > I will update it, thanks! > > (gdb) lx-version > > L(gdb) > > > > This can be fixed by casting 'linux_banner' as (char *). > > (gdb) lx-version > > Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu > > 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 > > > > gdb 7.4 seems to be no such issue. > > > > Signed-off-by: Du Changbin > > --- > > scripts/gdb/linux/proc.py | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py > > index 086d27223c0c..0aebd7565b03 100644 > > --- a/scripts/gdb/linux/proc.py > > +++ b/scripts/gdb/linux/proc.py > > @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): > > def invoke(self, arg, from_tty): > > # linux_banner should contain a newline > > -gdb.write(gdb.parse_and_eval("linux_banner").string()) > > +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) > > LxVersion() > > > > Looks good to me otherwise. > > Jan > > -- > Siemens AG, Corporate Technology, CT RDA IOT SES-DE > Corporate Competence Center Embedded Linux -- Thanks, Du Changbin
Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
On Wed, Oct 17, 2018 at 08:56:44AM +0200, Jan Kiszka wrote: > On 17.10.18 04:36, Du Changbin wrote: > > For gdb version less than 7.3, lx-version only one character. > > ^^^ prints? > I will update it, thanks! > > (gdb) lx-version > > L(gdb) > > > > This can be fixed by casting 'linux_banner' as (char *). > > (gdb) lx-version > > Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu > > 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 > > > > gdb 7.4 seems to be no such issue. > > > > Signed-off-by: Du Changbin > > --- > > scripts/gdb/linux/proc.py | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py > > index 086d27223c0c..0aebd7565b03 100644 > > --- a/scripts/gdb/linux/proc.py > > +++ b/scripts/gdb/linux/proc.py > > @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): > > def invoke(self, arg, from_tty): > > # linux_banner should contain a newline > > -gdb.write(gdb.parse_and_eval("linux_banner").string()) > > +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) > > LxVersion() > > > > Looks good to me otherwise. > > Jan > > -- > Siemens AG, Corporate Technology, CT RDA IOT SES-DE > Corporate Competence Center Embedded Linux -- Thanks, Du Changbin
Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
Hi Du, On 17/10/18 03:36, Du Changbin wrote: > For gdb version less than 7.3, lx-version only one character. > (gdb) lx-version > L(gdb) > > This can be fixed by casting 'linux_banner' as (char *). > (gdb) lx-version > Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu > 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 > > gdb 7.4 seems to be no such issue. > > Signed-off-by: Du Changbin > --- > scripts/gdb/linux/proc.py | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py > index 086d27223c0c..0aebd7565b03 100644 > --- a/scripts/gdb/linux/proc.py > +++ b/scripts/gdb/linux/proc.py > @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): > > def invoke(self, arg, from_tty): > # linux_banner should contain a newline > -gdb.write(gdb.parse_and_eval("linux_banner").string()) > +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) Interesting - this is an issue I reported to the GDB team after I'd tried to dig into the fault. https://sourceware.org/bugzilla/show_bug.cgi?id=20077 the parse_and_eval finds a string length of 0, but then later in the GBD parsing it gets incremented to 1, hence the single char. I guess it's some failure in GDB determining the type of the pointer. However, from reading the bugzilla entry and from what I recall - it only occurred if you had done a backtrace before calling lx-version. Did you discover that it would always return only the single character in your testing ? Even if it was the first command executed? My worry is - that if this fixes lx-version - do we also need to manually cast lx-cmdline as well ? (I never saw the issue occur on that cmd). I think considering the age of the bugzilla at GDB, and the lack of any GDB level fix or understanding - we should certainly apply this fix here - and probably include it in the stable trees too. With the title fix as highlighted by Jan, Reviewed-by: Kieran Bingham Would you be able to test the issue with the lx-cmdline command as well please? And if it is suffering the same issue - perhaps you could either submit a second patch to update that entry - or respin this one to include both? > > LxVersion() > > -- Regards -- Kieran
Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
Hi Du, On 17/10/18 03:36, Du Changbin wrote: > For gdb version less than 7.3, lx-version only one character. > (gdb) lx-version > L(gdb) > > This can be fixed by casting 'linux_banner' as (char *). > (gdb) lx-version > Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu > 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 > > gdb 7.4 seems to be no such issue. > > Signed-off-by: Du Changbin > --- > scripts/gdb/linux/proc.py | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py > index 086d27223c0c..0aebd7565b03 100644 > --- a/scripts/gdb/linux/proc.py > +++ b/scripts/gdb/linux/proc.py > @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): > > def invoke(self, arg, from_tty): > # linux_banner should contain a newline > -gdb.write(gdb.parse_and_eval("linux_banner").string()) > +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) Interesting - this is an issue I reported to the GDB team after I'd tried to dig into the fault. https://sourceware.org/bugzilla/show_bug.cgi?id=20077 the parse_and_eval finds a string length of 0, but then later in the GBD parsing it gets incremented to 1, hence the single char. I guess it's some failure in GDB determining the type of the pointer. However, from reading the bugzilla entry and from what I recall - it only occurred if you had done a backtrace before calling lx-version. Did you discover that it would always return only the single character in your testing ? Even if it was the first command executed? My worry is - that if this fixes lx-version - do we also need to manually cast lx-cmdline as well ? (I never saw the issue occur on that cmd). I think considering the age of the bugzilla at GDB, and the lack of any GDB level fix or understanding - we should certainly apply this fix here - and probably include it in the stable trees too. With the title fix as highlighted by Jan, Reviewed-by: Kieran Bingham Would you be able to test the issue with the lx-cmdline command as well please? And if it is suffering the same issue - perhaps you could either submit a second patch to update that entry - or respin this one to include both? > > LxVersion() > > -- Regards -- Kieran
Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
On 17.10.18 04:36, Du Changbin wrote: For gdb version less than 7.3, lx-version only one character. ^^^ prints? (gdb) lx-version L(gdb) This can be fixed by casting 'linux_banner' as (char *). (gdb) lx-version Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 gdb 7.4 seems to be no such issue. Signed-off-by: Du Changbin --- scripts/gdb/linux/proc.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index 086d27223c0c..0aebd7565b03 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): def invoke(self, arg, from_tty): # linux_banner should contain a newline -gdb.write(gdb.parse_and_eval("linux_banner").string()) +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) LxVersion() Looks good to me otherwise. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux
Re: [PATCH] scripts/gdb: fix lx-version for gdb 7.3-
On 17.10.18 04:36, Du Changbin wrote: For gdb version less than 7.3, lx-version only one character. ^^^ prints? (gdb) lx-version L(gdb) This can be fixed by casting 'linux_banner' as (char *). (gdb) lx-version Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 gdb 7.4 seems to be no such issue. Signed-off-by: Du Changbin --- scripts/gdb/linux/proc.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index 086d27223c0c..0aebd7565b03 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): def invoke(self, arg, from_tty): # linux_banner should contain a newline -gdb.write(gdb.parse_and_eval("linux_banner").string()) +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) LxVersion() Looks good to me otherwise. Jan -- Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate Competence Center Embedded Linux
[PATCH] scripts/gdb: fix lx-version for gdb 7.3-
For gdb version less than 7.3, lx-version only one character. (gdb) lx-version L(gdb) This can be fixed by casting 'linux_banner' as (char *). (gdb) lx-version Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 gdb 7.4 seems to be no such issue. Signed-off-by: Du Changbin --- scripts/gdb/linux/proc.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index 086d27223c0c..0aebd7565b03 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): def invoke(self, arg, from_tty): # linux_banner should contain a newline -gdb.write(gdb.parse_and_eval("linux_banner").string()) +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) LxVersion() -- 2.17.1
[PATCH] scripts/gdb: fix lx-version for gdb 7.3-
For gdb version less than 7.3, lx-version only one character. (gdb) lx-version L(gdb) This can be fixed by casting 'linux_banner' as (char *). (gdb) lx-version Linux version 4.19.0-rc1+ (changbin@acer) (gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)) #21 SMP Sat Sep 1 21:43:30 CST 2018 gdb 7.4 seems to be no such issue. Signed-off-by: Du Changbin --- scripts/gdb/linux/proc.py | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/scripts/gdb/linux/proc.py b/scripts/gdb/linux/proc.py index 086d27223c0c..0aebd7565b03 100644 --- a/scripts/gdb/linux/proc.py +++ b/scripts/gdb/linux/proc.py @@ -41,7 +41,7 @@ class LxVersion(gdb.Command): def invoke(self, arg, from_tty): # linux_banner should contain a newline -gdb.write(gdb.parse_and_eval("linux_banner").string()) +gdb.write(gdb.parse_and_eval("(char *)linux_banner").string()) LxVersion() -- 2.17.1