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

Alex Sidorenko wrote: >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 > I don't know. I don't have an x86 2.6.20 live system or dumpfile readily available, so I'll need some help from the "outside world" here... Anybody else know anything about this?