================================================================== BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode write to 0xffff88813dc55360 of 8 bytes by task 15474 on cpu 0: writeback_single_inode+0x10e/0x4a0 fs/fs-writeback.c:1726 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2791 __generic_file_fsync+0xf9/0x140 fs/libfs.c:1405 fat_file_fsync+0x4c/0x100 fs/fat/file.c:191 vfs_fsync_range+0x111/0x120 fs/sync.c:188 generic_write_sync include/linux/fs.h:2584 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4094 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860 vfs_iter_write+0x56/0x70 fs/read_write.c:901 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x8a/0xb0 fs/splice.c:1142 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1316 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff88813dc55360 of 8 bytes by task 15477 on cpu 1: vfs_fsync_range+0xa2/0x120 fs/sync.c:186 generic_write_sync include/linux/fs.h:2584 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4094 do_iter_write+0x4b4/0x7b0 fs/read_write.c:860 vfs_iter_write+0x56/0x70 fs/read_write.c:901 iter_file_splice_write+0x462/0x7e0 fs/splice.c:736 do_splice_from fs/splice.c:933 [inline] direct_splice_actor+0x8a/0xb0 fs/splice.c:1142 splice_direct_to_actor+0x31d/0x690 fs/splice.c:1088 do_splice_direct+0x10d/0x190 fs/splice.c:1194 do_sendfile+0x3b6/0x9a0 fs/read_write.c:1254 __do_sys_sendfile64 fs/read_write.c:1316 [inline] __se_sys_sendfile64 fs/read_write.c:1308 [inline] __x64_sys_sendfile64+0xbd/0x150 fs/read_write.c:1308 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd value changed: 0x0000000000000007 -> 0x0000000000000084 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 15477 Comm: syz-executor.1 Tainted: G W 6.6.0-rc7-syzkaller-00012-ge017769f4ce2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 ==================================================================