================================================================== BUG: KCSAN: data-race in vfs_fsync_range / writeback_single_inode write to 0xffff88816cf63c80 of 8 bytes by task 15535 on cpu 1: writeback_single_inode+0x143/0x590 fs/fs-writeback.c:1577 sync_inode fs/fs-writeback.c:2624 [inline] sync_inode_metadata+0x57/0x80 fs/fs-writeback.c:2644 __generic_file_fsync+0xf5/0x140 fs/libfs.c:1090 fat_file_fsync+0x48/0x100 fs/fat/file.c:190 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2982 [inline] generic_file_write_iter+0x103/0x130 mm/filemap.c:3825 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 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+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88816cf63c80 of 8 bytes by task 15539 on cpu 0: vfs_fsync_range+0x98/0x120 fs/sync.c:198 generic_write_sync include/linux/fs.h:2982 [inline] generic_file_write_iter+0x103/0x130 mm/filemap.c:3825 call_write_iter include/linux/fs.h:2114 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4c0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 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+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000007 -> 0x0000000000000004 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 15539 Comm: syz-executor.4 Not tainted 5.13.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================