Messages in this thread | | | Subject | Re: [BUG] general protection fault when reading /proc/kcore | From | David Hildenbrand <> | Date | Mon, 16 Aug 2021 19:54:24 +0200 |
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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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