================================================================== BUG: KCSAN: data-race in ext4_setattr / generic_file_buffered_read write to 0xffff888009652c50 of 8 bytes by task 15301 on cpu 1: i_size_write include/linux/fs.h:871 [inline] ext4_setattr+0xe27/0xf70 fs/ext4/inode.c:5470 notify_change+0x7b3/0xa50 fs/attr.c:336 do_truncate fs/open.c:64 [inline] do_sys_ftruncate+0x42d/0x530 fs/open.c:195 __do_sys_ftruncate fs/open.c:205 [inline] __se_sys_ftruncate fs/open.c:203 [inline] __x64_sys_ftruncate+0x2f/0x40 fs/open.c:203 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff888009652c50 of 8 bytes by task 15289 on cpu 0: i_size_read include/linux/fs.h:849 [inline] generic_file_buffered_read+0x1426/0x23a0 mm/filemap.c:2302 generic_file_read_iter+0x80/0x3d0 mm/filemap.c:2553 ext4_file_read_iter+0x2d0/0x420 fs/ext4/file.c:74 call_read_iter include/linux/fs.h:1897 [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: 15289 Comm: syz-executor.0 Not tainted 5.10.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================