d state

“Disk Sleep” or “Uninterruptible Sleep State”. Waiting I/O.

  1. waiting for data to be read from or written to disk
  2. waiting for I/O operations to complete
  3. waiting for a hardware event to occur.

Possible reaons

  1. I/O Operations: This could be due to slow storage devices, network issues, or other I/O-related problems.

  2. Hardware issues: such as failing or malfunctioning storage devices, network interface cards, or other hardware components required for I/O operations.

  3. Driver Problems: device drivers

  4. Kernel Bugs: prevent the proper handling of I/O events,

  5. Resource Depletion: If the system is running low on resources such as memory or disk space, processes might enter the D-state while waiting for those resources to become available.

  6. Deadlocks

  7. Issues with kernel modules or loadable kernel modules

  8. File System Corruption: Corruption in the file system structures or metadata could lead to processes being unable to access required files, causing them to enter the D-state.