================================================================== BUG: KCSAN: data-race in ext4_dio_write_end_io / ext4_mpage_readpages write to 0xffff88813e3c75d8 of 8 bytes by task 20252 on cpu 0: i_size_write include/linux/fs.h:916 [inline] ext4_dio_write_end_io+0xd3/0x100 fs/ext4/file.c:399 iomap_dio_complete+0xb8/0x3c0 fs/iomap/direct-io.c:86 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+0xaa9/0x11f0 fs/ext4/file.c:678 call_write_iter include/linux/fs.h:2163 [inline] do_iter_readv_writev+0x2de/0x380 fs/read_write.c:729 do_iter_write+0x192/0x5c0 fs/read_write.c:855 vfs_iter_write+0x4c/0x70 fs/read_write.c:896 iter_file_splice_write+0x43a/0x790 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+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813e3c75d8 of 8 bytes by task 20264 on cpu 1: i_size_read include/linux/fs.h:894 [inline] ext4_readpage_limit fs/ext4/readpage.c:221 [inline] ext4_mpage_readpages+0x358/0x1140 fs/ext4/readpage.c:265 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3266 read_pages+0xb6/0x540 mm/readahead.c:130 page_cache_ra_unbounded+0x16a/0x430 mm/readahead.c:211 ondemand_readahead+0x58c/0x7c0 page_cache_sync_ra+0xaf/0xe0 mm/readahead.c:580 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/0x1220 mm/filemap.c:2628 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2157 [inline] generic_file_splice_read+0x24f/0x330 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0x106/0x190 fs/splice.c:979 do_sendfile+0x63e/0xbb0 fs/read_write.c:1249 __do_sys_sendfile64 fs/read_write.c:1314 [inline] __se_sys_sendfile64 fs/read_write.c:1300 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1300 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000b6d000 -> 0x0000000000b7c000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 20264 Comm: syz-executor.5 Tainted: G W 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================