* Liam R. Howlett <Liam.Howlett@xxxxxxxxxx> [220717 08:42]: > * Yu Zhao <yuzhao@xxxxxxxxxx> [220717 01:58]: > > On Sat, Jul 16, 2022 at 10:20 PM Andrew Morton > > <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > > > > > On Sun, 17 Jul 2022 02:46:32 +0000 Liam Howlett <liam.howlett@xxxxxxxxxx> wrote: > > ... > > > gap = mas.index; > > > gap += (info->align_offset - gap) & info->align_mask; > > > - VM_BUG_ON(gap + info->length > info->high_limit); > > > - VM_BUG_ON(gap + info->length > mas.last); > > What arch did you hit these on? David asked for me to restore some of > the BUG_ONs in these functions and I guess I got it wrong. I think these should be removed until I better test them. > > > > > These VM_BUG_ONs are new, and I hit the second one quickly: > > > > kernel BUG at mm/mmap.c:1631! > > RIP: 0010:vm_unmapped_area+0xdb/0x1c0 > > Call Trace: > > <TASK> > > arch_get_unmapped_area+0x1ee/0x220 > > arch_get_unmapped_area_topdown+0x25a/0x290 > > get_unmapped_area+0x92/0x100 > > do_mmap+0x13f/0x560 > > vm_mmap_pgoff+0xcd/0x170
