losetup-26659 [000] 22264.651607: funcgraph_entry:        3.393 us  |  lo_open();
losetup-26659 [000] 22264.651622: funcgraph_entry:                  |  lo_ioctl() {
losetup-26659 [000] 22264.651622: funcgraph_entry:                  |    loop_clr_fd() {
losetup-26659 [000] 22264.651623: funcgraph_entry:                  |      __loop_clr_fd() {
losetup-26659 [000] 22264.689771: funcgraph_entry:        3.844 us  |        loop_release_xfer();
losetup-26659 [001] 22264.691239: funcgraph_exit:   # 39615.444 us  |      }
losetup-26659 [001] 22264.691241: funcgraph_exit:   # 39619.125 us  |    }
losetup-26659 [001] 22264.691242: funcgraph_exit:   # 39620.534 us  |  }
losetup-26659 [001] 22264.691499: funcgraph_entry:        2.186 us  |  lo_release();