[Crash-utility] crash does not work with last fedora kernels?
Alexey Makhalov
amakhalov at vmware.com
Thu Aug 5 03:19:44 UTC 2021
Hi Tao Liu,
Can you provide an information here for people who do not have
a Redhad subscription, please. Is it an issue in the crash or GDB.
To me it is related to GDB's line wrapping based on terminal width
which pexpect can not properly parse.
Thanks,
--Alexey
On 8/4/21, 6:58 PM, "crash-utility-bounces at redhat.com on behalf of Tao Liu" <crash-utility-bounces at redhat.com on behalf of ltao at redhat.com> wrote:
On Fri, Jul 30, 2021 at 06:04:59PM -0400, David Wysochanski wrote:
> I cannot share the vmcore unfortunately due to data contents.
>
> There's something strange going on in my setup though.
> I run the Python expect module ("pexpect" ) for automation and run
> crash commands under that.
> For some reason, when I run this gdb10 test branch, I get these weird errors.
> But then I'm not seeing errors when I run the same commands manually
> on the same vmcore and gdb10 test branch.
> So it's the combination of the new gdb10 branch plus pexpect
> environment where I see them, and only with some vmcores.
> It's possible some crash output format changes and confuses pexpect,
> and it's not a crash bug at all.
> I've also seen some strange crash behavior when certain sequences of
> crash commands are run.
> I'll see if I can narrow down the problem further and report back.
>
Hello David,
The error message as "bt: invalid input jne" is a known issue, you can find it in:
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.redhat.com%2Fshow_bug.cgi%3Fid%3D1896647%23c18&data=04%7C01%7Camakhalov%40vmware.com%7C6b2cb08f43ce4d5c559108d957b481ab%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637637255061020250%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=SXqtiw2W%2B0RRSsobeI4Gat7jogSTNnXNNF9%2BL%2Bon%2FZg%3D&reserved=0
and the root cause for the issue:
https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.redhat.com%2Fshow_bug.cgi%3Fid%3D1896647%23c19&data=04%7C01%7Camakhalov%40vmware.com%7C6b2cb08f43ce4d5c559108d957b481ab%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637637255061030246%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=TAxKlCfNvuvWnso3nNqlA6GWKlwyopPKFry9NjcrzT8%3D&reserved=0
Thanks,
Tao Liu
>
> On Fri, Jul 30, 2021 at 2:12 PM Alexey Makhalov <amakhalov at vmware.com> wrote:
> >
> > Hi David,
> > Can you share vmcore and kernel images? Or provide an intructions how to recreate this core?
> > I would be nice if you perform set of testing with your cores!
> > Thanks,
> > --Alexey
> >
> > On 7/30/21, 7:44 AM, "crash-utility-bounces at redhat.com on behalf of David Wysochanski" <crash-utility-bounces at redhat.com on behalf of dwysocha at redhat.com> wrote:
> >
> > On Thu, Jul 29, 2021 at 9:57 PM lijiang <lijiang at redhat.com> wrote:
> > >
> > > >
> > > > Hi, David
> > > > Thank you for the attention.
> > > > Currently, Fedora kernel has been forced to generate the DWARF4 debuginfo via the
> > > > CONFIG_DEBUG_INFO_DWARF4 kernel option, see jforbes' comment:
> > > > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsrc.fedoraproject.org%2Frpms%2Fkernel%2Fpull-request%2F48&data=04%7C01%7Camakhalov%40vmware.com%7C6b2cb08f43ce4d5c559108d957b481ab%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C0%7C0%7C637637255061030246%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=WOOZfDOhwKTYQLKd4OwgQU4xbIzaX4GO0SqQhKowFvw%3D&reserved=0
> > > >
> > > > Once crash gdb is upgraded, the DWARF5 could be enabled again in Fedora kernel.
> > > >
> > > > BTW: that is a temporary branch, still under tests and it has not been announced yet.
> > > >
> > >
> > > > Lianbo,
> > >
> > > > Please STOP replying to the digest, but reply properly on the
> > > > appropriate email thread.
> > > > I've been involved in a lot of open source projects over the past 15 years,
> > > > and you're the only one I've ever seen that replies to a digest, not the
> > > > appropriate email thread.
> > >
> > > Good suggestions, David.
> > >
> > > I remember that you reminded me about this issue before this time. But recently my email system switched to Gmail, and made a mistake again. I'm trying to get used to the Gmail
> > > system.
> > >
> > > But anyway, I hope that my last reply answered your questions.
> > >
> >
> > Yes, thank you. But did you see my feedback about some of the error
> > output, when I tested your branch?
> > Do you have a list of existing issues?
> > I can fairly easily test your experimental branch on a series of
> > vmcores, if that helps.
> >
> > Here's the feedback, cut/pasted from the other email thread:
> >
> > I'm seeing a lot of "invalid input" displayed like the below when
> > using the 'bt' command. Is this a known issue?
> >
> > bt: invalid input: "jne"
> > bt: invalid input: "mov"
> > bt: invalid input: "movl"
> > bt: invalid input: "jne"
> > bt: invalid input: "jne"
> > bt: invalid input: "jne"
> > bt: invalid input: "rep"
> > bt: invalid input: "je"
> > bt: invalid input: "je"
> > bt: invalid input: "je"
> > bt: invalid input: "call"
> > bt: invalid input: "call"
> > bt: invalid input: "jne"
> > bt: invalid input: "call"
> > bt: invalid input: "call"
> > bt: invalid input: "movl"
> > bt: invalid input: "mov"
> > bt: invalid input: "jne"
> > bt: invalid input: "mov"
> > bt: invalid input: "je"
> > bt: invalid input: "call"
> >
> > --
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