CVE-2026-43309

In the Linux kernel, the following vulnerability has been resolved:

md raid: fix hang when stopping arrays with metadata through dm-raid

When using device-mapper's dm-raid target, stopping a RAID array can cause

the system to hang under specific conditions.

This occurs when:

- A dm-raid managed device tree is suspended from top to bottom

(the top-level RAID device is suspended first, followed by its

underlying metadata and data devices)

- The top-level RAID device is then removed

Removing the top-level device triggers a hang in the following sequence:

the dm-raid destructor calls md_stop(), which tries to flush the

write-intent bitmap by writing to the metadata sub-devices. However, these

devices are already suspended, making them unable to complete the write-intent

operations and causing an indefinite block.

Fix:

- Prevent bitmap flushing when md_stop() is called from dm-raid

destructor context

and avoid a quiescing/unquescing cycle which could also cause I/O

- Still allow write-intent bitmap flushing when called from dm-raid

suspend context

This ensures that RAID array teardown can complete successfully even when the

underlying devices are in a suspended state.

This second patch uses md_is_rdwr() to distinguish between suspend and

destructor paths as elaborated on above.