================================================================== BUG: KCSAN: data-race in ext4_setattr / ondemand_readahead write to 0xffff888105f7b798 of 8 bytes by task 4947 on cpu 0: i_size_write include/linux/fs.h:916 [inline] ext4_setattr+0xd7f/0xef0 fs/ext4/inode.c:5498 notify_change+0x8a3/0xac0 fs/attr.c:410 do_truncate fs/open.c:64 [inline] do_sys_ftruncate+0x2ea/0x3a0 fs/open.c:192 __do_sys_ftruncate fs/open.c:203 [inline] __se_sys_ftruncate fs/open.c:201 [inline] __x64_sys_ftruncate+0x2f/0x40 fs/open.c:201 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 0xffff888105f7b798 of 8 bytes by task 4951 on cpu 1: i_size_read include/linux/fs.h:894 [inline] do_page_cache_ra mm/readahead.c:256 [inline] ondemand_readahead+0x52e/0x7c0 mm/readahead.c:552 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+0x3dd/0x1240 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+0x252/0x340 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: 0x00000000001e4400 -> 0x0000000000000800 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4951 Comm: syz-executor.1 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================