On Tue, Jun 11, 2024 at 07:46:33PM +0200, Oscar Salvador wrote: > On Tue, Jun 11, 2024 at 10:30:05AM -0700, Andrew Morton wrote: > > On Tue, 11 Jun 2024 03:34:25 -0700 syzbot <syzbot+569ed13f4054f271087b@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > > Hello, > > > > > > syzbot found the following issue on: > > > > Thanks. > > > > > Call Trace: > > > <TASK> > > > alloc_hugetlb_folio_nodemask+0xae/0x3f0 mm/hugetlb.c:2603 > > > memfd_alloc_folio+0x15e/0x390 mm/memfd.c:75 > > > memfd_pin_folios+0x1066/0x1720 mm/gup.c:3864 > > > udmabuf_create+0x658/0x11c0 drivers/dma-buf/udmabuf.c:353 > > > udmabuf_ioctl_create drivers/dma-buf/udmabuf.c:420 [inline] > > > udmabuf_ioctl+0x304/0x4f0 drivers/dma-buf/udmabuf.c:451 > > > vfs_ioctl fs/ioctl.c:51 [inline] > > > __do_sys_ioctl fs/ioctl.c:907 [inline] > > > __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 > > > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > > > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > > > I think we can pretty confidently point at the series "mm/gup: > > Introduce memfd_pin_folios() for pinning memfd folios". I'll drop the > > v14 series. > > jfyi: I am trying to reproduce this locally. Actually, should not memfd_alloc_folio() pass htlb_alloc_mask() instead of GFP_USER to alloc_hugetlb_folio_nodemask? Or at least do GFP_HIGHUSER. -- Oscar Salvador SUSE Labs
