On (23/10/18 15:44), Mike Kravetz wrote: > Hi Sergey, > > Sorry for the delay. Not ignoring your report but chasing this in > another thread. Hi Mike, no worries. > https://lore.kernel.org/linux-mm/20231018222003.GA21776@monkey/ Oh, interesting. I just read the article the other day about some of unexpected optimizations that clang can do [1]. Setting h to NULL seems to be fixing the problem for me. > Quick question. > Are you using LLVM/clang in your builds? Yes, clang 14.0.6 The kernel compiled with gcc does not BUG_ON(). > My guess is that you are hitting the same issue. That BUG at mm/hugetlb.c:3180 > should not be checked/executed unless you allocate gigantic hugetlb pages on > the kernel command line. Suspect you are not doing this, and loop code is > being run when it should not. Looks very similar indeed. [1] https://research.swtch.com/ub
