================================================================== BUG: KCSAN: data-race in ext4_handle_inode_extension / ext4_mpage_readpages write to 0xffff88811e4ed378 of 8 bytes by task 1305 on cpu 0: i_size_write include/linux/fs.h:876 [inline] ext4_update_inode_size fs/ext4/ext4.h:3141 [inline] ext4_handle_inode_extension+0x214/0x530 fs/ext4/file.c:330 ext4_dio_write_iter fs/ext4/file.c:554 [inline] ext4_file_write_iter+0xe17/0x1060 fs/ext4/file.c:658 call_write_iter include/linux/fs.h:1882 [inline] do_iter_readv_writev+0x32e/0x3d0 fs/read_write.c:713 do_iter_write+0x112/0x4b0 fs/read_write.c:1018 vfs_iter_write+0x4c/0x70 fs/read_write.c:1059 iter_file_splice_write+0x41a/0x770 fs/splice.c:750 do_splice_from fs/splice.c:846 [inline] direct_splice_actor+0x95/0x160 fs/splice.c:1016 splice_direct_to_actor+0x365/0x660 fs/splice.c:971 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1601 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1587 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811e4ed378 of 8 bytes by task 1307 on cpu 1: ext4_readpage_limit fs/ext4/readpage.c:219 [inline] ext4_mpage_readpages+0x50d/0x13a0 fs/ext4/readpage.c:265 ext4_readahead+0x93/0xa0 fs/ext4/inode.c:3241 read_pages+0x9c/0x700 mm/readahead.c:130 page_cache_readahead_unbounded+0x41a/0x470 mm/readahead.c:244 ondemand_readahead+0x4e4/0x6e0 mm/readahead.c:273 page_cache_sync_readahead+0x178/0x1a0 mm/readahead.c:585 generic_file_buffered_read+0x2ec/0x1f60 mm/filemap.c:2199 generic_file_read_iter+0x7d/0x3e0 mm/filemap.c:2503 ext4_file_read_iter+0x2d8/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1876 [inline] generic_file_splice_read+0x22b/0x310 fs/splice.c:312 do_splice_to fs/splice.c:870 [inline] splice_direct_to_actor+0x2a8/0x660 fs/splice.c:950 do_splice_direct+0xf2/0x170 fs/splice.c:1059 do_sendfile+0x56a/0xba0 fs/read_write.c:1540 __do_sys_sendfile64 fs/read_write.c:1595 [inline] __se_sys_sendfile64 fs/read_write.c:1587 [inline] __x64_sys_sendfile64+0xa9/0x130 fs/read_write.c:1587 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: 1 PID: 1307 Comm: syz-executor.2 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================