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Home/ Questions/Q 6738817
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T11:24:48+00:00 2026-05-26T11:24:48+00:00

I am dumping a class in Windbg (by dt ) and for a bool

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I am dumping a class in Windbg (by dt) and for a bool member I see the value fffffffffffffff8 (bin: …1111111111111111000). It is a valid value (including padding) or not?

PS: i’m investigating a dump that may be a memory corruption so .. can’t be sure.
PS2: my bool is in class between a pointer and a size_t. Compiled as release.

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  1. Editorial Team
    Editorial Team
    2026-05-26T11:24:49+00:00Added an answer on May 26, 2026 at 11:24 am

    It’s not a valid bool value — bool should only show up as 0 or 1. Since you’re seeing 0xf8, the memory is either not initialized or overwritten. (Note that for some reason, WinDbg will only read a single byte and then sign-extend it to 64-bits.)

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