================================================================== BUG: KCSAN: data-race in __mark_inode_dirty / __mark_inode_dirty write to 0xffff88811cd41730 of 8 bytes by task 13619 on cpu 0: __mark_inode_dirty+0x1c1/0x940 fs/fs-writeback.c:2289 mark_buffer_dirty+0x28b/0x2b0 fs/buffer.c:1150 __block_commit_write.isra.0+0x11d/0x170 fs/buffer.c:2075 block_write_end+0x6d/0x140 fs/buffer.c:2153 generic_write_end+0x8c/0x1f0 fs/buffer.c:2167 fat_write_end+0x57/0x120 fs/fat/inode.c:250 generic_perform_write+0x1d7/0x320 mm/filemap.c:3313 __generic_file_write_iter+0x2d7/0x370 mm/filemap.c:3399 generic_file_write_iter+0x294/0x38e mm/filemap.c:3463 call_write_iter include/linux/fs.h:1907 [inline] do_iter_readv_writev+0x4a7/0x5d0 fs/read_write.c:694 do_iter_write fs/read_write.c:999 [inline] do_iter_write+0x137/0x3a0 fs/read_write.c:980 vfs_iter_write+0x56/0x80 fs/read_write.c:1040 iter_file_splice_write+0x530/0x830 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] direct_splice_actor+0x97/0xb0 fs/splice.c:1037 splice_direct_to_actor+0x22f/0x540 fs/splice.c:992 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811cd41730 of 8 bytes by task 13633 on cpu 1: __mark_inode_dirty+0xb6/0x940 fs/fs-writeback.c:2272 fat_update_time fs/fat/misc.c:347 [inline] fat_update_time+0x1a1/0x1b0 fs/fat/misc.c:330 update_time+0x53/0x90 fs/inode.c:1694 touch_atime+0x13f/0x150 fs/inode.c:1766 file_accessed include/linux/fs.h:2226 [inline] generic_file_read_iter+0x10b0/0x14e0 mm/filemap.c:2286 call_read_iter include/linux/fs.h:1901 [inline] generic_file_splice_read+0x2df/0x470 fs/splice.c:313 do_splice_to+0xc7/0x100 fs/splice.c:892 splice_direct_to_actor+0x1b9/0x540 fs/splice.c:971 do_splice_direct+0x152/0x1d0 fs/splice.c:1080 do_sendfile+0x380/0x800 fs/read_write.c:1521 __do_sys_sendfile64 fs/read_write.c:1582 [inline] __se_sys_sendfile64 fs/read_write.c:1568 [inline] __x64_sys_sendfile64+0x121/0x140 fs/read_write.c:1568 do_syscall_64+0xc7/0x3b0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 13633 Comm: syz-executor.5 Not tainted 5.7.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================