================================================================== BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode write to 0xffff888109e96130 of 8 bytes by task 5112 on cpu 0: writeback_single_inode+0x10e/0x4a0 fs/fs-writeback.c:1721 sync_inode_metadata+0x56/0x80 fs/fs-writeback.c:2780 __generic_file_fsync+0xf9/0x140 fs/libfs.c:1138 fat_file_fsync+0x4c/0x100 fs/fat/file.c:191 vfs_fsync_range+0x10b/0x120 fs/sync.c:188 generic_write_sync include/linux/fs.h:2469 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4093 do_iter_write+0x4ae/0x770 fs/read_write.c:860 vfs_iter_write+0x50/0x70 fs/read_write.c:901 iter_file_splice_write+0x456/0x7d0 fs/splice.c:795 do_splice_from fs/splice.c:873 [inline] direct_splice_actor+0x84/0xa0 fs/splice.c:1039 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:994 do_splice_direct+0x104/0x180 fs/splice.c:1082 do_sendfile+0x3b8/0x950 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 0xffff888109e96130 of 8 bytes by task 5118 on cpu 1: vfs_fsync_range+0x9c/0x120 fs/sync.c:186 generic_write_sync include/linux/fs.h:2469 [inline] generic_file_write_iter+0x191/0x1c0 mm/filemap.c:4093 do_iter_write+0x4ae/0x770 fs/read_write.c:860 vfs_iter_write+0x50/0x70 fs/read_write.c:901 iter_file_splice_write+0x456/0x7d0 fs/splice.c:795 do_splice_from fs/splice.c:873 [inline] direct_splice_actor+0x84/0xa0 fs/splice.c:1039 splice_direct_to_actor+0x2ee/0x5f0 fs/splice.c:994 do_splice_direct+0x104/0x180 fs/splice.c:1082 do_sendfile+0x3b8/0x950 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: 5118 Comm: syz-executor.3 Not tainted 6.4.0-rc7-syzkaller-00019-g99ec1ed7c2ed #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 ==================================================================