David Anderson wrote:
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?
It would be something post-2.6.18 (RHEL5)
Dave
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