[Crash-utility] Crash utility with RT patchset

[Abhishek Shah]

Hi Kazu,

I am trying crash from master branch, top commit: d6b4f36d6b22
("Handle task_struct state member changes for kernels >= 5.14-rc1")
I will give it a try with the released crash-7.3.0 and update.


Regards,
Abhishek

On Fri, Jul 9, 2021 at 1:26 PM HAGIO KAZUHITO(萩尾　一仁) <k-hagio-ab at nec.com> wrote:
>
> Hi Abhishek,
>
> Does it happens with the released crash-7.3.0 ?
> Recently we had four patches for arm64 after the release,
> I'd like to know whether it's a regression or not to narrow down.
>
> Thanks,
> Kazu
>
> -----Original Message-----
> > Hi Ron,
> >
> > > I guess the address convention seems x8664 when looking at  0xffffffxxxxxxxx type sort of 64 bit virtual
> > address.
> >
> > arm64 also has a similar range of virtual addresses (see
> > "Documentation/arm64/memory.rst" in Linux),
> > currently my target is using 39-bits (as specified in crash command
> > used below) and 4 kB page table.
> >
> > I see below address range being used, when giving "-d 1" to enable debug prints:
> >
> > crash: get_cpus_present: present: 8
> > hypervisor: (undetermined)
> > ikconfig: 1616 valid configs.
> > SECTION_SIZE_BITS: 30
> > CONFIG_ARM64_VA_BITS: 39
> >       VA_BITS_ACTUAL: 39
> > (calculated) VA_BITS: 39
> >  PAGE_OFFSET: ffffff8000000000
> >     VA_START: ffffffc000000000
> >      modules: ffffffc008000000 - ffffffc00fffffff
> >      vmalloc: ffffffc010000000 - fffffffebffeffff
> > kernel image: fffffff009680000 - fffffff00b194000
> >      vmemmap: fffffffeffe00000 - ffffffffffffffff
> >
> >
> > Also ,There is no issue with crash (compiled for arm64) or vmlinux (arm64) type.
> >
> > > Either that or possibly the offset at which you are trying to load.
> > Are you referring to kaslr offset? Without that in place, I get a
> > vmlinux/ramdump mismatch error.
> > So I am confident that it is correct.
> >
> > Can anyone suggest whether any change is required in either crash utility or
> > RT Linux to make use of crash utility to analyze ramdump with RT Linux?
> >
> >
> > Regards,
> > Abhishek
> >
> > On Thu, Jul 8, 2021 at 7:49 AM Ron HM <gpl.positron at gmail.com> wrote:
> > >
> > > Either that or possibly the offset at which you are trying to load.
> > >
> > > On Thu, 8 Jul 2021, 9:28 am Ron HM, <gpl.positron at gmail.com> wrote:
> > >>
> > >> Hi Abhishek,
> > >> I guess the address convention seems x8664 when looking at  0xffffffxxxxxxxx type sort of 64 bit virtual
> > address.
> > >>
> > >> ------
> > >> crash: invalid kernel virtual address: fffffff791ff5a5f  type: "64-bit KVADDR"
> > >> -----
> > >>
> > >> For arm64 bit the addressing would more be sort of 0xCCAbxxxxxxx sorts. Due to the convention of memory
> > addressing start addresses.
> > >>
> > >> As a first check confirm if your crash and vmlinuz file is x8664 type
> > >> # file vmlinux
> > >> # file crash
> > >>
> > >>
> > >>
> > >>
> > >> On Wed, 7 Jul 2021, 3:53 pm Abhishek Shah, <abrs612 at gmail.com> wrote:
> > >>>
> > >>> Hi All,
> > >>>
> > >>> I was wondering if there is any change required in either crash utility or
> > >>> RT Linux to make use of crash utility to analyze ramdump with RT Linux.
> > >>>
> > >>> I am using crash 7.3.0++ and Linux - 5.4.61-rt37 on arm64 target.
> > >>> I see the below error:
> > >>> ../crash DDR0.BIN at 0x80000000,DDR1.BIN at 0x100000000 vmlinux
> > >>> --machdep vabits_actual=39 --kaslr 0x2ff9600000
> > >>> ......
> > >>> crash: invalid kernel virtual address: fffffff791ff5a5f  type: "64-bit KVADDR"
> > >>>
> > >>>
> > >>> Regards,
> > >>> Abhishek
> > >>>
> > >>> --
> > >>> Crash-utility mailing list
> > >>> Crash-utility at redhat.com
> > >>> https://listman.redhat.com/mailman/listinfo/crash-utility
> > >>>
> > > --
> > > Crash-utility mailing list
> > > Crash-utility at redhat.com
> > > https://listman.redhat.com/mailman/listinfo/crash-utility
> >
> > --
> > Crash-utility mailing list
> > Crash-utility at redhat.com
> > https://listman.redhat.com/mailman/listinfo/crash-utility
>
>
> --
> Crash-utility mailing list
> Crash-utility at redhat.com
> https://listman.redhat.com/mailman/listinfo/crash-utility
>