==================================================================
BUG: KCSAN: data-race in file_update_time / generic_update_time

write to 0xffff88812b26b248 of 16 bytes by task 12328 on cpu 1:
 generic_update_time+0x109/0x270 fs/inode.c:1660
 update_time fs/inode.c:1683 [inline]
 file_update_time+0x237/0x300 fs/inode.c:1898
 filemap_page_mkwrite+0xae/0x1d0 mm/filemap.c:2678
 do_page_mkwrite+0x100/0x210 mm/memory.c:2276
 do_shared_fault mm/memory.c:3650 [inline]
 do_fault mm/memory.c:3718 [inline]
 handle_pte_fault mm/memory.c:3945 [inline]
 __handle_mm_fault+0x1e45/0x2e00 mm/memory.c:4075
 handle_mm_fault+0x21b/0x530 mm/memory.c:4112
 faultin_page mm/gup.c:640 [inline]
 __get_user_pages+0x485/0x1130 mm/gup.c:851
 __get_user_pages_locked mm/gup.c:1029 [inline]
 get_user_pages_unlocked+0x221/0x3f0 mm/gup.c:1702
 __gup_longterm_unlocked mm/gup.c:2389 [inline]
 get_user_pages_fast+0x307/0x340 mm/gup.c:2444
 iov_iter_get_pages+0x1d3/0x8aa lib/iov_iter.c:1322
 __bio_iov_iter_get_pages block/bio.c:888 [inline]
 bio_iov_iter_get_pages+0x100/0x5a0 block/bio.c:944
 __blkdev_direct_IO fs/block_dev.c:386 [inline]
 blkdev_direct_IO+0x5ec/0xac0 fs/block_dev.c:476
 generic_file_read_iter+0x1b0/0x1440 mm/filemap.c:2303
 blkdev_read_iter+0xb2/0xe0 fs/block_dev.c:2039
 call_read_iter include/linux/fs.h:1896 [inline]
 do_iter_readv_writev+0x54b/0x5b0 fs/read_write.c:691
 do_iter_read+0x1fc/0x3d0 fs/read_write.c:933
 vfs_readv+0x9c/0xf0 fs/read_write.c:997
 do_preadv+0x131/0x1d0 fs/read_write.c:1089
 __do_sys_preadv fs/read_write.c:1139 [inline]
 __se_sys_preadv fs/read_write.c:1134 [inline]
 __x64_sys_preadv+0x61/0x80 fs/read_write.c:1134
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff88812b26b250 of 8 bytes by task 12335 on cpu 0:
 timespec64_equal include/linux/time64.h:52 [inline]
 file_update_time+0xee/0x300 fs/inode.c:1882
 filemap_page_mkwrite+0xae/0x1d0 mm/filemap.c:2678
 do_page_mkwrite+0x100/0x210 mm/memory.c:2276
 do_shared_fault mm/memory.c:3650 [inline]
 do_fault mm/memory.c:3718 [inline]
 handle_pte_fault mm/memory.c:3945 [inline]
 __handle_mm_fault+0x1e45/0x2e00 mm/memory.c:4075
 handle_mm_fault+0x21b/0x530 mm/memory.c:4112
 faultin_page mm/gup.c:640 [inline]
 __get_user_pages+0x485/0x1130 mm/gup.c:851
 __get_user_pages_locked mm/gup.c:1029 [inline]
 get_user_pages_unlocked+0x221/0x3f0 mm/gup.c:1702
 __gup_longterm_unlocked mm/gup.c:2389 [inline]
 get_user_pages_fast+0x307/0x340 mm/gup.c:2444
 iov_iter_get_pages+0x1d3/0x8aa lib/iov_iter.c:1322
 __bio_iov_iter_get_pages block/bio.c:888 [inline]
 bio_iov_iter_get_pages+0x100/0x5a0 block/bio.c:944
 __blkdev_direct_IO fs/block_dev.c:386 [inline]
 blkdev_direct_IO+0x5ec/0xac0 fs/block_dev.c:476
 generic_file_read_iter+0x1b0/0x1440 mm/filemap.c:2303
 blkdev_read_iter+0xb2/0xe0 fs/block_dev.c:2039
 call_read_iter include/linux/fs.h:1896 [inline]
 do_iter_readv_writev+0x54b/0x5b0 fs/read_write.c:691
 do_iter_read+0x1fc/0x3d0 fs/read_write.c:933
 vfs_readv+0x9c/0xf0 fs/read_write.c:997
 do_preadv+0x131/0x1d0 fs/read_write.c:1089
 __do_sys_preadv fs/read_write.c:1139 [inline]
 __se_sys_preadv fs/read_write.c:1134 [inline]
 __x64_sys_preadv+0x61/0x80 fs/read_write.c:1134
 do_syscall_64+0xcc/0x3a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 12335 Comm: syz-executor.0 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================