================================================================== BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all read to 0xffff88812be27620 of 1 bytes by task 8991 on cpu 1: lru_add_drain_all+0xf5/0x350 mm/swap.c:728 memfd_wait_for_pins mm/memfd.c:82 [inline] memfd_add_seals mm/memfd.c:199 [inline] memfd_fcntl+0x71b/0xd00 mm/memfd.c:231 do_fcntl+0x156/0xa80 fs/fcntl.c:421 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x118/0x160 fs/fcntl.c:448 do_syscall_64+0xcc/0x370 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 write to 0xffff88812be27620 of 1 bytes by task 8930 on cpu 0: pagevec_add include/linux/pagevec.h:81 [inline] __lru_cache_add+0xbf/0x1d0 mm/swap.c:405 lru_cache_add mm/swap.c:442 [inline] lru_cache_add_active_or_unevictable+0xb6/0x1f0 mm/swap.c:472 alloc_set_pte+0x2be/0xef0 mm/memory.c:3304 finish_fault+0xdb/0x180 mm/memory.c:3352 do_cow_fault mm/memory.c:3527 [inline] do_fault mm/memory.c:3620 [inline] handle_pte_fault mm/memory.c:3849 [inline] __handle_mm_fault+0xf47/0x2cb0 mm/memory.c:3973 handle_mm_fault+0x21b/0x530 mm/memory.c:4010 faultin_page mm/gup.c:640 [inline] __get_user_pages+0x485/0x1160 mm/gup.c:845 __get_user_pages_locked mm/gup.c:1023 [inline] get_user_pages_locked+0x20d/0x3e0 mm/gup.c:1650 get_vaddr_frames+0x4e5/0x550 mm/frame_vector.c:75 vb2_create_framevec+0x68/0xd0 drivers/media/common/videobuf2/videobuf2-memops.c:51 vb2_vmalloc_get_userptr+0x99/0x308 drivers/media/common/videobuf2/videobuf2-vmalloc.c:90 __prepare_userptr+0x21c/0x9f0 drivers/media/common/videobuf2/videobuf2-core.c:1062 __buf_prepare+0x3af/0x430 drivers/media/common/videobuf2/videobuf2-core.c:1302 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 8930 Comm: syz-executor.4 Not tainted 5.4.0-rc3+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================