---
name: "cxl-clear-media-poison"
section: "1"
platform: "linux"
package: "ndctl"
version: "85-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/cxl-clear-media-poison"
---

# cxl-clear-media-poison(1)

Clear poison from CXL memory

## NAME

cxl-clear-media-poison - Clear poison from CXL memory

## SYNOPSIS

```
cxl clear-media-poison <memdev> [<options>]
```

Clear poison from a CXL memory device’s memory. CXL memdevs can be specified by device name (e.g. "mem0"), device id ("X" in "memX"), or host device name ("0000:35:00.0").

To see if a device has poison that can be cleared use the *cxl-list* command with the *-L*/*--media-errors* option. An example of a device that has had poison injected at device physical address (a.k.a. "offset") 0x1000:

```
# cxl list -m mem0 -L -u
{
  "memdev":"mem0",
  "ram_size":"1024.00 MiB (1073.74 MB)",
  "ram_qos_class":42,
  "serial":"0x0",
  "numa_node:1,
  "host":"0000:35:00.0",
  "media_errors":[
    {
          "offset":"0x1000",
          "length":64,
          "source":"Injected"
        }
  ]
}
```

A device physical address is required to clear poison from a CXL memdev. The *-a*/*--address* option is used to specify the address to clear poison at. The address can be given in either decimal or hexadecimal. An example using the example device above:

```
# cxl clear-media-poison mem0 -a 0x1000
poison cleared at mem0:0x1000
# cxl list -m mem0 -L -u
{
  "memdev":"mem0",
  "ram_size":"1024.00 MiB (1073.74 MB)",
  "ram_qos_class":42,
  "serial":"0x0",
  "numa_node:1,
  "host":"0000:35:00.0",
  "media_errors":[
  ]
}
```

See the *inject-media-poison* command for how to inject poison into a CXL memory device.

This command depends on the CXL debug filesystem (normally mounted at "/sys/kernel/debug/cxl") to clear device poison.

## OPTIONS

- \-a, --address

  Device physical address (DPA) to clear poison at. Address can be specified in hex or decimal.

- \--debug

  Enable debug output

## SEE ALSO

[cxl-list(1)](/cxl-list/1.md) [cxl-clear-media-poison(1)](/cxl-clear-media-poison/1.md)