On 10/19/23 11:15, Sergey Senozhatsky wrote: > 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 Thank you for testing! -- Mike Kravetz
