================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty write to 0xffff888135d12ce0 of 8 bytes by task 1192 on cpu 0: __mark_inode_dirty+0x1f8/0x6a0 fs/fs-writeback.c:2434 mark_buffer_dirty+0x143/0x200 fs/buffer.c:1112 __block_commit_write fs/buffer.c:2079 [inline] block_write_end+0x13d/0x260 fs/buffer.c:2158 generic_write_end+0x5e/0x180 fs/buffer.c:2172 fat_write_end+0x4a/0x160 fs/fat/inode.c:249 generic_perform_write+0x251/0x3e0 mm/filemap.c:3781 __generic_file_write_iter+0x174/0x310 mm/filemap.c:3897 generic_file_write_iter+0x75/0x130 mm/filemap.c:3929 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 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+0x43a/0x790 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+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 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+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888135d12ce0 of 8 bytes by task 1229 on cpu 1: __mark_inode_dirty+0xda/0x6a0 fs/fs-writeback.c:2419 fat_update_time+0x125/0x140 fs/fat/misc.c:351 update_time fs/inode.c:1786 [inline] touch_atime+0x12f/0x250 fs/inode.c:1858 file_accessed include/linux/fs.h:2504 [inline] generic_file_splice_read+0x2ac/0x340 fs/splice.c:314 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+0x63e/0xbb0 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+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000001 -> 0x0000000000000007 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1229 Comm: syz-executor.0 Not tainted 5.14.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================