Description of problem: new feature in ironic to clear the non-OS disks during the bmh installation. Only works for disks with blocksize=512

Customer says the following:

This is unlisted new feature (or enhancement) in OCP4.14. This non-OS disk wiping during bmh installation is not available in 4.12.

    Version-Release number of selected component (if applicable):{code:none}



The following command generated by ironic.
"dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct"
Fails with

ironic-agent[4054]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct

ironic-agent[4054]: Exit code: 1

podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root [-] Unexpected error dispatching erase_devices_metadata to manager <ironic_python_agent.hardware.GenericHardwareManager object at 0x7f050797f2e0>: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.

    

How reproducible:
Repeatable for bmh with disk has block size larger than 512.

Steps to Reproduce:

    1. This problem will occur on server with disk has block size greater than 512.   For example, SAMSUNG, p/n: KR-05RJND-SSK00-389-02DF-A02, that drive has block size of 4096.
    2. Add a bmh which has non-OS disk with block size greater than 512.
      2a.  The introspection of the bmh will be fine.
      2b.  When the bmh is added (provisioning phase), the OCP installation will try to wipe out the non-OS drive using command "dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct".   This can be monitored in the bmh via "journalctl -f -b".  In the case of disk with block size of 4096, the above dd command will be rejected.  The bmh will be rebooted and attempt the step 2b over again.
    3. Manual testing.  in a bmh server with disks have block-size greater than 512, (tested with disks have bz=4096 ).
      the command:    "dd bs=512 if=/dev/zero of=/dev/sdb count=33"  will failed
       the alternate command which determine the disk's block-size for the dd command will work. 
      "dd bs=$(blockdev --getss /dev/sdb) if=/dev/zero of=/dev/sdb count=33 oflag=direct"

    

Actual results:

Expected results:
disk will be formatted with any blocksize

additial logs:

In OCP 4.14.16, there is new feature in ironic to clear the non-OS disks during the bmh installation. The following command generated by ironic.
"dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct"
"dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct"

The reason for failure is the alignment restriction, logical block size are different depending disk type.

May be instead of
"dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct".

It could be replaced by:
"dd bs=$(blockdev --getss /dev/sda) if=/dev/zero of=/dev/sda count=33 oflag=direct"

That would work for various type of disks.

~~~~ THE IRONIC ERROR in OCP 4.14.16 ~~~~
-agent[4054]: 2024-03-27 04:00:48.240 1 ERROR root [-] Unexpected error dispatching erase_devices_metadata to manager <ironic_python_agent.hardware.GenericHardwareManager object at 0x7f050797f2e0>: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root [-] Unexpected error dispatching erase_devices_metadata to manager <ironic_python_agent.hardware.GenericHardwareManager object at 0x7f050797f2e0>: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n": ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Traceback (most recent call last):
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 3124, in dispatch_to_managers
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root return getattr(manager, method)(*args, **kwargs)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 1702, in erase_devices_metadata
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root raise errors.BlockDeviceEraseError(excpt_msg)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.240 1 ERROR root
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root [-] Error performing clean step erase_devices_metadata: ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Traceback (most recent call last):
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/extensions/clean.py", line 77, in execute_clean_step
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root result = hardware.dispatch_to_managers(step['step'], node, ports,
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 3124, in dispatch_to_managers
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root return getattr(manager, method)(*args, **kwargs)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 1702, in erase_devices_metadata
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root raise errors.BlockDeviceEraseError(excpt_msg)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root [-] Command failed: execute_clean_step, error: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n": ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Traceback (most recent call last):
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/extensions/base.py", line 174, in run
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root result = self.execute_method(**self.command_params)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/extensions/clean.py", line 77, in execute_clean_step
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root result = hardware.dispatch_to_managers(step['step'], node, ports,
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 3124, in dispatch_to_managers
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root return getattr(manager, method)(*args, **kwargs)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root File "/usr/lib/python3.9/site-packages/ironic_python_agent/hardware.py", line 1702, in erase_devices_metadata
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root raise errors.BlockDeviceEraseError(excpt_msg)
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root ironic_python_agent.errors.BlockDeviceEraseError: Error erasing block device: Failed to erase the metadata on the device(s): "/dev/sdb": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sdb count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stderr: "dd: error writing '/dev/sdb': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.6049e-05 s, 0.0 kB/s\n"; "/dev/sda": Unexpected error while running command.
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Command: dd bs=512 if=/dev/zero of=/dev/sda count=33 oflag=direct
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stdout: ''
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root Stderr: "dd: error writing '/dev/sda': Invalid argument\n1+0 records in\n0+0 records out\n0 bytes copied, 3.9605e-05 s, 0.0 kB/s\n"
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com podman[4014]: 2024-03-27 04:00:48.242 1 ERROR root
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Exit code: 1
Mar 27 04:00:48 r660hd-0.compactocp802.mavdallab.com ironic-agent[4054]: Stdout: ''