Re: [PATCH v4] mm/vmalloc: randomize vmalloc() allocations

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On 14.3.2021 19.23, Uladzislau Rezki wrote:
Also, using vmaloc test driver i can trigger a kernel BUG:

<snip>
[   24.627577] kernel BUG at mm/vmalloc.c:1272!

It seems that most tests indeed fail. Perhaps the vmalloc subsystem isn't very robust in face of fragmented virtual memory. What could be done to fix that?

In this patch, I could retry __alloc_vmap_area() with the whole region after failure of both [random, vend] and [vstart, random] but I'm not sure that would help much. Worth a try of course.

By the way, some of the tests in test_vmalloc.c don't check for vmalloc() failure, for example in full_fit_alloc_test().

-Topi




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