==================================================================
BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty

write to 0xffff88812f592ad0 of 8 bytes by task 2354 on cpu 1:
 __mark_inode_dirty+0x1c4/0x6a0 fs/fs-writeback.c:2433
 generic_update_time fs/inode.c:1774 [inline]
 update_time fs/inode.c:1787 [inline]
 file_update_time+0x3a4/0x3e0 fs/inode.c:2003
 file_modified+0x62/0x80 fs/inode.c:2026
 ext4_write_checks fs/ext4/file.c:247 [inline]
 ext4_buffered_write_iter+0x1f9/0x400 fs/ext4/file.c:264
 ext4_file_write_iter+0x2e7/0x11a0
 call_write_iter include/linux/fs.h:2163 [inline]
 do_iter_readv_writev+0x2cd/0x370 fs/read_write.c:729
 do_iter_write+0x192/0x5c0 fs/read_write.c:855
 vfs_iter_write+0x4c/0x70 fs/read_write.c:896
 iter_file_splice_write+0x40a/0x750 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0x80/0xa0 fs/splice.c:936
 splice_direct_to_actor+0x345/0x650 fs/splice.c:891
 do_splice_direct+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x618/0xb90 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88812f592ad0 of 8 bytes by task 2337 on cpu 0:
 __mark_inode_dirty+0xda/0x6a0 fs/fs-writeback.c:2419
 generic_update_time fs/inode.c:1774 [inline]
 update_time fs/inode.c:1787 [inline]
 touch_atime+0x170/0x240 fs/inode.c:1858
 file_accessed include/linux/fs.h:2504 [inline]
 filemap_read+0x1198/0x1210 mm/filemap.c:2700
 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779
 ext4_file_read_iter+0x1db/0x290
 call_read_iter include/linux/fs.h:2157 [inline]
 generic_file_splice_read+0x22c/0x310 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+0xf5/0x170 fs/splice.c:979
 do_sendfile+0x618/0xb90 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1314 [inline]
 __se_sys_sendfile64 fs/read_write.c:1300 [inline]
 __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1300
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae

value changed: 0x0000000000000000 -> 0x0000000000000005

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 2337 Comm: syz-executor.1 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================