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
