================================================================== BUG: KCSAN: data-race in ext4_set_iomap / writeback_single_inode write to 0xffff888106db3398 of 8 bytes by task 5358 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 ext4_fsync_nojournal fs/ext4/fsync.c:92 [inline] ext4_sync_file+0x359/0x670 fs/ext4/fsync.c:170 vfs_fsync_range+0x107/0x120 fs/sync.c:200 generic_write_sync include/linux/fs.h:2982 [inline] iomap_dio_complete+0x2d5/0x3c0 fs/iomap/direct-io.c:127 iomap_dio_rw+0x4e/0x70 fs/iomap/direct-io.c:652 ext4_dio_write_iter fs/ext4/file.c:568 [inline] ext4_file_write_iter+0xa4f/0x11d0 fs/ext4/file.c:678 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 0xffff888106db3398 of 8 bytes by task 5351 on cpu 0: ext4_inode_datasync_dirty fs/ext4/inode.c:3330 [inline] ext4_set_iomap+0x17c/0x460 fs/ext4/inode.c:3345 ext4_iomap_begin_report+0x2ff/0x390 fs/ext4/inode.c:3604 iomap_apply+0x8d/0x400 fs/iomap/apply.c:46 iomap_fiemap+0x100/0x270 fs/iomap/fiemap.c:83 ext4_fiemap+0x1ee/0x210 fs/ext4/extents.c:4918 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0xe14/0x1410 fs/ioctl.c:1009 __do_sys_ioctl fs/ioctl.c:1067 [inline] __se_sys_ioctl+0x83/0x140 fs/ioctl.c:1055 __x64_sys_ioctl+0x3f/0x50 fs/ioctl.c:1055 do_syscall_64+0x4a/0x90 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000007 -> 0x0000000000000080 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 5351 Comm: syz-executor.1 Not tainted 5.13.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================