> On 11-Sep-2023, at 3:00 PM, Aditya Gupta <adityag@xxxxxxxxxxxxx> wrote: > > Currently 'crash-tool' fails on vmcore collected on upstream kernel on > PowerPC64 with the error: > > crash: invalid kernel virtual address: 0 type: "first list entry > > Presently the address translation for vmemmap addresses is done using > the vmemmap_list. But with the below commit in Linux, vmemmap_list can > be empty, in case of Radix MMU on PowerPC64 > > 368a0590d954: (powerpc/book3s64/vmemmap: switch radix to use a > different vmemmap handling function) > > In case vmemmap_list is empty, then it's head is NULL, which crash tries > to access and fails due to accessing NULL. > > Instead of depending on 'vmemmap_list' for address translation for > vmemmap addresses, do a kernel pagetable walk to get the physical > address associated with given virtual address > > Reviewed-by: Hari Bathini <hbathini@xxxxxxxxxxxxx> > Signed-off-by: Aditya Gupta <adityag@xxxxxxxxxxxxx> Thanks for the patch. With this patch applied (along with makedumpfile & kernel changes) I am able to read a vmcore captured against a kernel which contains commit 8dc9a0ad0c3e Tested-by: Sachin Sant <sachinp@xxxxxxxxxxxxx> - Sachin -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/crash-utility Contribution Guidelines: https://github.com/crash-utility/crash/wiki
