Re: [Crash-utility] Broken vtop on kernel 2.6.20?

Hi Dave, when I try to use 'vtop' for process pages on 2.6.20 kernel (Ubuntu/Feisty) on x86 architecture, I get error messages about page table. The easiest way to reproduce is to run 'ps -a' on a live kernel: PID: 0 TASK: c03a2440 CPU: 0 COMMAND: "swapper" ps: no user stack PID: 0 TASK: df838560 CPU: 1 COMMAND: "swapper" ps: no user stack PID: 1 TASK: df838a90 CPU: 1 COMMAND: "init" ps: read error: physical address: 7f2f0000 type: "page table" Running crash with -d8: PID: 1 TASK: df838a90 CPU: 1 COMMAND: "init" <readmem: df838a90, KVADDR, "fill_task_struct", 1328, (ROE|Q), 8d2eac0> <readmem: dfb71e40, KVADDR, "fill_mm_struct", 432, (ROE|Q), 8d8bf80> GETBUF(128 -> 1) FREEBUF(1) GETBUF(128 -> 1) FREEBUF(1) GETBUF(128 -> 1) FREEBUF(1) GETBUF(128 -> 1) FREEBUF(1) arg_start: bf991ecf arg_end: bf991ee1 (18) env_start: bf991ee1 env_end: bf991ff1 (272) GETBUF(291 -> 1) <readmem: dfb6f000, KVADDR, "pgd page", 4096, (FOE), 843cf90> <readmem: dfb6f000, KVADDR, "pmd page", 4096, (FOE), 843cf90> <readmem: 7f2f0000, PHYSADDR, "page table", 4096, (FOE), 843efa0> ps: read error: physical address: 7f2f0000 type: "page table" The same crash-4.0-4.1 works fine on live 2.6.15 kernel. Did the page table layout change between 2.6.15 and 2.6.20 ? Regards, Alex