Fix cuda memory access violation in GQA FlashAttention#24447
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RyanUnderhill merged 1 commit intomainfrom Apr 17, 2025
Merged
Fix cuda memory access violation in GQA FlashAttention#24447RyanUnderhill merged 1 commit intomainfrom
RyanUnderhill merged 1 commit intomainfrom
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…ad to a runtime crash later on.
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### Description
zeros_ memory buffer was uninitialized, but it must be initialized to
zero.
### Motivation and Context
A memory allocator change in GenAI started crashing in FlashAttention
and this was eventually tracked down to be the cause. The allocator
change was innocent. I'm not sure how this didn't fail previously, or if
it was we weren't getting the reports about it.
Co-authored-by: Ryan Hill <{ID}+{username}@users.noreply.github.com>
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Description
zeros_ memory buffer was uninitialized, but it must be initialized to zero.
Motivation and Context
A memory allocator change in GenAI started crashing in FlashAttention and this was eventually tracked down to be the cause. The allocator change was innocent. I'm not sure how this didn't fail previously, or if it was we weren't getting the reports about it.