================================================================== BUG: KCSAN: data-race in ext4_mpage_readpages / ext4_setattr write to 0xffff88811eeea338 of 8 bytes by task 19932 on cpu 0: i_size_write include/linux/fs.h:876 [inline] ext4_setattr+0xd63/0xec0 fs/ext4/inode.c:5386 notify_change+0x7d7/0xa80 fs/attr.c:336 do_truncate+0xe0/0x120 fs/open.c:64 handle_truncate fs/namei.c:2909 [inline] do_open fs/namei.c:3255 [inline] path_openat+0x1a31/0x20a0 fs/namei.c:3368 do_filp_open+0xbd/0x1d0 fs/namei.c:3395 do_sys_openat2+0x33b/0x500 fs/open.c:1168 do_sys_open fs/open.c:1184 [inline] __do_sys_creat fs/open.c:1258 [inline] __se_sys_creat fs/open.c:1252 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1252 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88811eeea338 of 8 bytes by task 19926 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_async_readahead+0x1c6/0x1e0 mm/readahead.c:631 generic_file_buffered_read+0x391/0x1f60 mm/filemap.c:2211 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: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 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19926 Comm: syz-executor.3 Not tainted 5.9.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================