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SubjectRe: [BUG] general protection fault when reading /proc/kcore
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On 16.08.21 19:49, David Hildenbrand wrote:
> On 16.08.21 19:34, Jiri Olsa wrote:
>> hi,
>> I'm getting fault below when running:
>>
>> # cat /proc/kallsyms | grep ksys_read
>> ffffffff8136d580 T ksys_read
>> # objdump -d --start-address=0xffffffff8136d580 --stop-address=0xffffffff8136d590 /proc/kcore
>>
>> /proc/kcore: file format elf64-x86-64
>>
>> Segmentation fault
>>
>> any idea? config is attached
>
> Just tried with a different config on 5.14.0-rc6+
>
> [root@localhost ~]# cat /proc/kallsyms | grep ksys_read
> ffffffff8927a800 T ksys_readahead
> ffffffff89333660 T ksys_read
>
> [root@localhost ~]# objdump -d --start-address=0xffffffff89333660
> --stop-address=0xffffffff89333670
>
> a.out: file format elf64-x86-64


Sorry, missed the /proc/kcore part:

[root@localhost ~]# cat /proc/kallsyms | grep ksys_read
ffffffffba27a800 T ksys_readahead
ffffffffba333660 T ksys_read
[root@localhost ~]# objdump -d --start-address=0xffffffffba333660
--stop-address=0xffffffffba333670 /proc/kcore

/proc/kcore: file format elf64-x86-64


Disassembly of section load1:

ffffffffba333660 <load1+0x333660>:
ffffffffba333660: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
ffffffffba333665: 41 55 push %r13
ffffffffba333667: 49 89 d5 mov %rdx,%r13
ffffffffba33366a: 41 54 push %r12
ffffffffba33366c: 49 89 f4 mov %rsi,%r12
ffffffffba33366f: 55 push %rbp


--
Thanks,

David / dhildenb

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