Hello Kazu, On Mon, Jun 15, 2020 at 8:38 PM HAGIO KAZUHITO(萩尾 一仁) <k-hagio-ab@xxxxxxx> wrote: > > -----Original Message----- > > > [root@lxkmg-pag-ale test64]# /usr/bin/crash -d 15 > > > System.map-4.18.0-147.el8.x86_64 vmlinux.debuginfo vmcore > ... > > > <read_diskdump: addr: ffffffff82131200 paddr: 37b31200 cnt: 8> > > > read_diskdump: PAGE_EXCLUDED: paddr/pfn: 37b31200/37b31 > > > crash: page excluded: kernel virtual address: ffffffff82131200 type: "page_offset_base" > > > [root@lxkmg-pag-ale test64]# > > > > Hmmm, I think you should find better results with: > > > > $ crash vmlinux vmcore (On the machine used for post-processing) > > > > and > > > > $ crash vmlinux /proc/kcore (On the original crashing system) > > > > I think if that helps you reach the crash > prompt, we have a potential issue which needs to be looked-at. > > Can you please try to run the same and let me know the outcome? > > > > Thanks, > > Bhupesh > > > > > > -- > > Crash-utility mailing list > > Crash-utility@xxxxxxxxxx > > https://www.redhat.com/mailman/listinfo/crash-utility > > > > Hello, > > > > Running the above mentioned command on the server used to post process the crash shows a message indicating > > a mismatch between the vmcore and kernel.debug binary. > > > > I will now first try to clarify this and come back later on if the issue is still there. > > > > Thanks for helping. > > Best regards, > > Patrick Agrain > > > > Just FYI, with respect to the System.map file, the following Dave's post > would be helpful: > https://www.redhat.com/archives/crash-utility/2018-June/msg00002.html > > If you have the vmlinux corresponding to a running kernel, you don't need > the System.map file. Indeed, I remember discussing this with Dave A. some months back. Infact with newer KASLR enabled kernels it makes little sense to use System.map file as it contains the non-relocated symbol values that were compiled into the vmlinux file - that's why I suggested just to use to the vmlinux and vmcore file as an arguments while invoking the crash tool to Patrick. However, going back to the discussion I had with Dave A., I think the main point of confusion was the 'crash_whitepaper' which is still located at [1], and which provides the following example to invoke the crash utility with the System.map file, vmlinux and vmcore combination: Examples when running on a dumpfile: $ crash /boot/System.map vmlinux.dbg vmcore I think while this was ok for older kernels which did not support KASLR, for newer kernels this needs an update. I am trying to see if I can modify the 'crash_whitepaper' and push the same to github, so that users are not confused with the System.map option. What's your views on the same? Please let me know. [1]. https://crash-utility.github.io/crash_whitepaper.html Thanks, Bhupesh -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
