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    SubjectRe: [RFC][PATCH 4/7] perf: Fix scaling vs enable_on_exec
    On 02/23, Jiri Olsa wrote:
    >
    > so I finally got some reasonable backtrace and figured that crash finally:
    >
    > #7 [ffff8802751afcd0] general_protection at ffffffff817a69e8
    > [exception RIP: special_mapping_fault+47]
    > RIP: ffffffff811e40df RSP: ffff8802751afd88 RFLAGS: 00010282
    > RAX: ffff8802747e8b68 RBX: 00007fffffffe080 RCX: c4712d0070657267
    > RDX: ffff8802751afd98 RSI: ffff8802742c4f00 RDI: ffff8802747e8b68
    > RBP: ffff8802751afd88 R8: 0000000000000000 R9: ffff8802751afe58
    > R10: 00000000000001fe R11: 00003fffffe00000 R12: ffff8802742c4f00
    > R13: ffff8802751afe58 R14: 0000000000000000 R15: ffff880273f59ff8
    > ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0000
    > #8 [ffff8802751afd90] __do_fault at ffffffff811db505
    > #9 [ffff8802751afdf8] handle_mm_fault at ffffffff811e0b03
    > #10 [ffff8802751afec8] __do_page_fault at ffffffff8106734a
    > #11 [ffff8802751aff20] do_page_fault at ffffffff810675df
    > #12 [ffff8802751aff50] page_fault at ffffffff817a6a48
    >
    >
    > it was caused by:
    > - f872f5400cc0 mm: Add a vm_special_mapping.fault() method
    > that added call of vm_special_mapping::fault if it's defined

    I guess it came from tip/x86...

    > - and uprobes code not initializing this fault pointer properly,
    > attached patch fixed the issue for me,
    > Oleg, I'm not sure this is how you want to fix this though..

    Thanks! I'll send a simple fix tomorrow.

    Oleg.

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