** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Triaged
** Changed in: ubuntu-z-systems
Importance: Undecided => High
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https://bugs.launchpad.net/bugs/1828394
Title:
[UBUNTU] qdio: clear intparm during shutdown
Status in Ubuntu on IBM z Systems:
Triaged
Status in linux package in Ubuntu:
New
Bug description:
Description: qdio: clear intparm during shutdown
Symptom: Crash in qeth_irq() with "Unable to handle kernel pointer
dereference in virtual kernel address space".
Problem: During shutdown, qdio returns its ccw device back to control
by qeth - but doesn't reset the interrupt parameter on the
device. If qdio_shutdown() failed to terminate its
long-running IO on the ccw_device, qeth will subsequently
do so. In this case the IRQ for the IO completion is
presented to qeth_irq() with the _old_ interrupt parameter,
which gets mis-interpreted as a valid qeth_cmd_buffer
pointer. Dereferencing this bogus pointer in
qeth_release_buffer() triggers the crash.
Solution: When returning the ccw device in qdio_shutdown(), also reset
its interrupt parameter.
Reproduction: Offline an OSA CHPID with multiple active qeth interfaces.
Component: Kernel
Upstream-ID: 89286320a236d245834075fa13adb0bdd827ecaa
Reported: Ubuntu 18.04
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