================================================================== BUG: KCSAN: data-race in ext4_set_iomap / writeback_single_inode write to 0xffff8881052e2c90 of 8 bytes by task 1298 on cpu 1: inode_sync_complete fs/fs-writeback.c:1210 [inline] writeback_single_inode+0x4eb/0x580 fs/fs-writeback.c:1583 sync_inode fs/fs-writeback.c:2605 [inline] sync_inode_metadata+0x52/0x70 fs/fs-writeback.c:2625 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x335/0x6e0 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2747 [inline] ext4_buffered_write_iter+0x369/0x3b0 fs/ext4/file.c:276 ext4_file_write_iter+0x768/0x1060 include/linux/fs.h:784 call_write_iter include/linux/fs.h:1882 [inline] do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:1026 vfs_iter_write+0x4c/0x70 fs/read_write.c:1067 iter_file_splice_write+0x41a/0x770 fs/splice.c:770 do_splice_from fs/splice.c:866 [inline] direct_splice_actor+0x95/0x160 fs/splice.c:1036 splice_direct_to_actor+0x365/0x660 fs/splice.c:991 do_splice_direct+0xf2/0x170 fs/splice.c:1079 do_sendfile+0x56a/0xba0 fs/read_write.c:1548 __do_sys_sendfile64 fs/read_write.c:1603 [inline] __se_sys_sendfile64 fs/read_write.c:1595 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1595 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8881052e2c90 of 8 bytes by task 1292 on cpu 0: ext4_inode_datasync_dirty fs/ext4/inode.c:3305 [inline] ext4_set_iomap+0x138/0x3e0 fs/ext4/inode.c:3320 ext4_iomap_begin+0x5a0/0x5f0 fs/ext4/inode.c:3447 iomap_apply+0x8b/0x540 fs/iomap/apply.c:46 iomap_dio_rw+0x434/0x980 fs/iomap/direct-io.c:506 ext4_dio_write_iter fs/ext4/file.c:548 [inline] ext4_file_write_iter+0xdd5/0x1060 fs/ext4/file.c:658 call_write_iter include/linux/fs.h:1882 [inline] do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:721 do_iter_write+0x112/0x4b0 fs/read_write.c:1026 vfs_iter_write+0x4c/0x70 fs/read_write.c:1067 iter_file_splice_write+0x41a/0x770 fs/splice.c:770 do_splice_from fs/splice.c:866 [inline] direct_splice_actor+0x95/0x160 fs/splice.c:1036 splice_direct_to_actor+0x365/0x660 fs/splice.c:991 do_splice_direct+0xf2/0x170 fs/splice.c:1079 do_sendfile+0x56a/0xba0 fs/read_write.c:1548 __do_sys_sendfile64 fs/read_write.c:1609 [inline] __se_sys_sendfile64 fs/read_write.c:1595 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1595 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 1292 Comm: syz-executor.5 Not tainted 5.9.0-rc8-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================