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?