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BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty

write to 0xffff8881321ea160 of 8 bytes by task 4997 on cpu 0:
 __mark_inode_dirty+0x1bc/0x6c0 fs/fs-writeback.c:2434
 fat_update_time+0x125/0x140 fs/fat/misc.c:351
 inode_update_time fs/inode.c:1794 [inline]
 touch_atime+0x16e/0x2e0 fs/inode.c:1867
 file_accessed include/linux/fs.h:2505 [inline]
 filemap_read+0x1648/0x16d0 mm/filemap.c:2714
 generic_file_read_iter+0x72/0x2a0 mm/filemap.c:2792
 call_read_iter include/linux/fs.h:2156 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff8881321ea160 of 8 bytes by task 4998 on cpu 1:
 __mark_inode_dirty+0xd7/0x6c0 fs/fs-writeback.c:2420
 fat_update_time+0x125/0x140 fs/fat/misc.c:351
 inode_update_time fs/inode.c:1794 [inline]
 touch_atime+0x16e/0x2e0 fs/inode.c:1867
 file_accessed include/linux/fs.h:2505 [inline]
 filemap_read+0x1648/0x16d0 mm/filemap.c:2714
 generic_file_read_iter+0x72/0x2a0 mm/filemap.c:2792
 call_read_iter include/linux/fs.h:2156 [inline]
 generic_file_splice_read+0x24f/0x330 fs/splice.c:311
 do_splice_to fs/splice.c:796 [inline]
 splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870
 do_splice_direct+0x106/0x190 fs/splice.c:979
 do_sendfile+0x675/0xc40 fs/read_write.c:1245
 __do_sys_sendfile64 fs/read_write.c:1310 [inline]
 __se_sys_sendfile64 fs/read_write.c:1296 [inline]
 __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000000001

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 4998 Comm: syz-executor.3 Not tainted 5.16.0-rc8-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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