================================================================== BUG: KCSAN: data-race in ext4_setattr / filemap_read write to 0xffff888104a091e8 of 8 bytes by task 13896 on cpu 0: i_size_write include/linux/fs.h:913 [inline] ext4_setattr+0xd7e/0xf20 fs/ext4/inode.c:5440 notify_change+0x8a3/0xac0 fs/attr.c:410 do_truncate+0xf7/0x140 fs/open.c:64 handle_truncate fs/namei.c:3082 [inline] do_open fs/namei.c:3430 [inline] path_openat+0x192c/0x1eb0 fs/namei.c:3559 do_filp_open+0x105/0x220 fs/namei.c:3586 do_sys_openat2+0xb5/0x2b0 fs/open.c:1200 do_sys_open fs/open.c:1216 [inline] __do_sys_creat fs/open.c:1292 [inline] __se_sys_creat fs/open.c:1286 [inline] __x64_sys_creat+0x62/0x80 fs/open.c:1286 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 0xffff888104a091e8 of 8 bytes by task 13883 on cpu 1: i_size_read include/linux/fs.h:891 [inline] filemap_read+0x1278/0x1720 mm/filemap.c:2636 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2775 ext4_file_read_iter+0x1db/0x290 call_read_iter include/linux/fs.h:2155 [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+0x675/0xc40 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x102/0x140 fs/read_write.c:1296 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: 0x00000000028aac01 -> 0x0000000000000000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 13883 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================