================================================================== BUG: KCSAN: data-race in ext4_setattr / filemap_read write to 0xffff88813440dbb0 of 8 bytes by task 18798 on cpu 0: i_size_write include/linux/fs.h:871 [inline] ext4_setattr+0xd54/0xec0 fs/ext4/inode.c:5481 notify_change+0x8a3/0xa80 fs/attr.c:398 do_truncate fs/open.c:64 [inline] do_sys_ftruncate+0x405/0x4c0 fs/open.c:196 __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x2f/0x40 fs/open.c:205 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88813440dbb0 of 8 bytes by task 18790 on cpu 1: i_size_read include/linux/fs.h:849 [inline] filemap_read+0xd58/0x1220 mm/filemap.c:2562 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2701 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:2108 [inline] generic_file_splice_read+0x22a/0x310 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+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x00000000015e8201 -> 0x0000000000000001 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 18790 Comm: syz-executor.2 Not tainted 5.14.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================