================================================================== BUG: KCSAN: data-race in ext4_handle_inode_extension / ext4_mpage_readpages write to 0xffff8880095666b0 of 8 bytes by task 14685 on cpu 1: i_size_write include/linux/fs.h:870 [inline] ext4_update_inode_size fs/ext4/ext4.h:3260 [inline] ext4_handle_inode_extension+0x226/0x550 fs/ext4/file.c:332 ext4_dio_write_iter fs/ext4/file.c:558 [inline] ext4_file_write_iter+0xe48/0x1090 fs/ext4/file.c:662 call_write_iter include/linux/fs.h:1901 [inline] do_iter_readv_writev+0x2cb/0x360 fs/read_write.c:740 do_iter_write+0x112/0x4b0 fs/read_write.c:866 vfs_iter_write+0x4c/0x70 fs/read_write.c:907 iter_file_splice_write+0x42a/0x780 fs/splice.c:686 do_splice_from fs/splice.c:764 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:933 splice_direct_to_actor+0x345/0x650 fs/splice.c:888 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1318 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1304 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff8880095666b0 of 8 bytes by task 14695 on cpu 0: ext4_readpage_limit fs/ext4/readpage.c:219 [inline] ext4_mpage_readpages+0x44b/0x14c0 fs/ext4/readpage.c:265 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3252 read_pages+0xa0/0x6e0 mm/readahead.c:130 page_cache_ra_unbounded+0x17d/0x4c0 mm/readahead.c:212 ondemand_readahead+0x560/0x780 mm/readahead.c:267 page_cache_sync_ra+0x1ab/0x1c0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:839 [inline] generic_file_buffered_read_get_pages+0x234/0xaf0 mm/filemap.c:2361 generic_file_buffered_read+0x26f/0x980 mm/filemap.c:2478 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2630 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1895 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:788 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:867 do_splice_direct+0xf5/0x170 fs/splice.c:976 do_sendfile+0x5db/0xca0 fs/read_write.c:1257 __do_sys_sendfile64 fs/read_write.c:1312 [inline] __se_sys_sendfile64 fs/read_write.c:1304 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1304 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: 14695 Comm: syz-executor.0 Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================