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BUG: KCSAN: data-race in file_update_time / generic_update_time

write to 0xffff888129c88f00 of 16 bytes by task 24194 on cpu 0:
 generic_update_time+0x109/0x270 fs/inode.c:1674
 update_time+0x7d/0x90 fs/inode.c:1694
 file_update_time+0x205/0x2d0 fs/inode.c:1909
 filemap_page_mkwrite+0xb3/0x1d0 mm/filemap.c:2656
 do_page_mkwrite+0xfa/0x210 mm/memory.c:2364
 do_shared_fault mm/memory.c:3738 [inline]
 do_fault mm/memory.c:3806 [inline]
 handle_pte_fault mm/memory.c:4033 [inline]
 __handle_mm_fault+0x1d99/0x2cf0 mm/memory.c:4163
 handle_mm_fault+0x21c/0x540 mm/memory.c:4200
 faultin_page mm/gup.c:659 [inline]
 __get_user_pages+0x485/0x1140 mm/gup.c:870
 __get_user_pages_locked mm/gup.c:1057 [inline]
 get_user_pages_unlocked+0x24a/0x420 mm/gup.c:1765
 __gup_longterm_unlocked mm/gup.c:2423 [inline]
 internal_get_user_pages_fast mm/gup.c:2464 [inline]
 get_user_pages_fast+0x32d/0x350 mm/gup.c:2505
 iov_iter_get_pages+0x1d3/0x8cc lib/iov_iter.c:1323
 __bio_iov_iter_get_pages block/bio.c:939 [inline]
 bio_iov_iter_get_pages+0x106/0x5a0 block/bio.c:995
 __blkdev_direct_IO fs/block_dev.c:386 [inline]
 blkdev_direct_IO+0x5e3/0xab0 fs/block_dev.c:476
 generic_file_read_iter+0x1aa/0x1490 mm/filemap.c:2281
 blkdev_read_iter+0xae/0xe0 fs/block_dev.c:2039
 call_read_iter include/linux/fs.h:1895 [inline]
 do_iter_readv_writev+0x570/0x5d0 fs/read_write.c:691
 do_iter_read+0x1e4/0x3a0 fs/read_write.c:933
 vfs_readv+0x9c/0xf0 fs/read_write.c:1053
 do_preadv+0x129/0x1c0 fs/read_write.c:1145
 __do_sys_preadv fs/read_write.c:1195 [inline]
 __se_sys_preadv fs/read_write.c:1190 [inline]
 __x64_sys_preadv+0x5e/0x80 fs/read_write.c:1190
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

read to 0xffff888129c88f08 of 8 bytes by task 24195 on cpu 1:
 timespec64_equal include/linux/time64.h:52 [inline]
 file_update_time+0xee/0x2d0 fs/inode.c:1893
 filemap_page_mkwrite+0xb3/0x1d0 mm/filemap.c:2656
 do_page_mkwrite+0xfa/0x210 mm/memory.c:2364
 do_shared_fault mm/memory.c:3738 [inline]
 do_fault mm/memory.c:3806 [inline]
 handle_pte_fault mm/memory.c:4033 [inline]
 __handle_mm_fault+0x1d99/0x2cf0 mm/memory.c:4163
 handle_mm_fault+0x21c/0x540 mm/memory.c:4200
 faultin_page mm/gup.c:659 [inline]
 __get_user_pages+0x485/0x1140 mm/gup.c:870
 __get_user_pages_locked mm/gup.c:1057 [inline]
 get_user_pages_unlocked+0x24a/0x420 mm/gup.c:1765
 __gup_longterm_unlocked mm/gup.c:2423 [inline]
 internal_get_user_pages_fast mm/gup.c:2464 [inline]
 get_user_pages_fast+0x32d/0x350 mm/gup.c:2505
 iov_iter_get_pages+0x1d3/0x8cc lib/iov_iter.c:1323
 __bio_iov_iter_get_pages block/bio.c:939 [inline]
 bio_iov_iter_get_pages+0x106/0x5a0 block/bio.c:995
 __blkdev_direct_IO fs/block_dev.c:386 [inline]
 blkdev_direct_IO+0x5e3/0xab0 fs/block_dev.c:476
 generic_file_read_iter+0x1aa/0x1490 mm/filemap.c:2281
 blkdev_read_iter+0xae/0xe0 fs/block_dev.c:2039
 call_read_iter include/linux/fs.h:1895 [inline]
 do_iter_readv_writev+0x570/0x5d0 fs/read_write.c:691
 do_iter_read+0x1e4/0x3a0 fs/read_write.c:933
 vfs_readv+0x9c/0xf0 fs/read_write.c:1053
 do_preadv+0x129/0x1c0 fs/read_write.c:1145
 __do_sys_preadv fs/read_write.c:1195 [inline]
 __se_sys_preadv fs/read_write.c:1190 [inline]
 __x64_sys_preadv+0x5e/0x80 fs/read_write.c:1190
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 24195 Comm: syz-executor.3 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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