Hot plugging SCSI disk leads to kernel panic with message: "kernel BUG at block/blk-core.c:1944"

Solution Unverified - Updated -

Issue

Unplug a SCSI disk which is currently being accessed, then after a few minutes plug it back in again.

The host sometimes panics with the message:

kernel BUG at block/blk-core.c:1944.
...
RIP  [<ffffffff812473e5>] blk_dequeue_request+0xa5/0xc0

Environment

  • RHEL 6.1.z kernels

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