um: ubd: Fix for processes stuck in D state forever

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commit 2a2361228c upstream.

Starting with Linux 3.12 processes get stuck in D state forever in
UserModeLinux under sync heavy workloads. This bug was introduced by
commit 805f11a0d5 (um: ubd: Add REQ_FLUSH suppport).
Fix bug by adding a check if FLUSH request was successfully submitted to
the I/O thread and keeping the FLUSH request on the request queue on
submission failures.

Fixes: 805f11a0d5 (um: ubd: Add REQ_FLUSH suppport)
Signed-off-by: Thorsten Knabe <linux@thorsten-knabe.de>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Thorsten Knabe 2014-08-23 15:47:38 +02:00 • committed by Luis Henriques

parent 49bef5ac78

commit fd6baa91c6

1 changed files with 3 additions and 2 deletions

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arch/um/drivers/ubd_kern.c

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