----- Original Message ----- > These are the same lines in my case. > > <readmem: c0d2af6c, KVADDR, "crash_notes", 4, (ROE), 85ba84c> > <read_kdump: addr: c0d2af6c paddr: 80f2af6c cnt: 4> > <readmem: f9fe0000, KVADDR, "note_buf_t", 560, (ROE), 85bac40> <--- !! > <readmem: c0004000, KVADDR, "pgd page", 16384, (FOE), 914e8d0> > > I have never seen this problem before, so the behavior you see is > exactly what I have seen before. However with a fairly new kernel I > did not get the correct crash_notes. The investigation lead to the > patch for the problem described in my previous mail. > > I have not investigated if there is any patch in newer kernels that > changes this behavior and in that case where it comes from (it could > be a patch by us). However as the algorithm for reading crash_notes > is wrong, as it depends on a variable that is not yet initialized, I > think it should be corrected anyhow. I have tested my patch with > both newer and older kernels and it works as intended. OK, good. And so apparently the per-cpu region has been moved up into vmalloc space. I'll queue the change into crash-6.0.9. For curiosity's sake, can you show me the per-cpu symbol list? In my sample ARM kernel, it's located in the unity-mapped region just below the .text section, and can be seen like this: crash> sym -l ... [ cut ] ... c004e000 (d) .data..percpu c004e000 (D) __per_cpu_load c004e000 (D) __per_cpu_start c004e000 (D) cpu_data c004e040 (d) percpu_clockevent c004e098 (D) current_kprobe c004e09c (D) kprobe_ctlblk c004e130 (d) bp_on_reg c004e170 (d) wp_on_reg c004e1b0 (D) mmu_gathers c004e1c0 (D) current_mm c004e1e0 (D) kstat ... [ cut ] ... c004f0b4 (d) xmit_recursion c004f0b8 (d) rt_cache_stat c004f100 (d) runqueues c004f620 (d) gcwq_nr_running c004f640 (d) cfd_data c004f660 (d) call_single_queue c004f6a0 (d) csd_data c004f6c0 (D) softnet_data c004f7a0 (D) __per_cpu_end c0050000 (t) .text ... Your newer kernel must move it up to ~fxxxxxxx? Thanks, Dave -- Crash-utility mailing list Crash-utility@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/crash-utility
