==================================================================
BUG: KCSAN: data-race in handle_mm_fault / watchdog

read to 0xffff888088732110 of 8 bytes by task 1061 on cpu 0:
 check_hung_uninterruptible_tasks kernel/hung_task.c:197 [inline]
 watchdog+0x2c3/0x7c0 kernel/hung_task.c:289
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

write to 0xffff888088732110 of 8 bytes by task 22196 on cpu 1:
 handle_mm_fault+0x4a/0x530 mm/memory.c:3987
 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
 vb2_core_qbuf+0x4a2/0xa70 drivers/media/common/videobuf2/videobuf2-core.c:1597
 vb2_qbuf+0xdd/0x140 drivers/media/common/videobuf2/videobuf2-v4l2.c:761
 v4l2_m2m_qbuf+0x103/0x240 drivers/media/v4l2-core/v4l2-mem2mem.c:502
 v4l2_m2m_ioctl_qbuf+0x50/0x70 drivers/media/v4l2-core/v4l2-mem2mem.c:1079
 v4l_qbuf drivers/media/v4l2-core/v4l2-ioctl.c:1982 [inline]
 v4l_qbuf+0x6d/0x90 drivers/media/v4l2-core/v4l2-ioctl.c:1976

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 22196 Comm: syz-executor.3 Not tainted 5.4.0-rc3+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================