Re: mnt_is_reachable() deadlock? [was: opteron server dies with vserver patch]

On Wed, Jan 25, 2012 at 05:14:51PM +0100, Pawel Sikora wrote:
> Hi Herbert,

> i've finally grabbed some useful backtraces in current short
> service window. with short autofs unmount timeout (1 sec)
> machine oopses in few seconds :)

that is good news indeed, can you enable the following
kernel options and retest/trigger the issue?

CONFIG_DEBUG_KERNEL=y
CONFIG_DEBUG_BUGVERBOSE=y
CONFIG_DEBUG_INFO=y
CONFIG_DEBUG_INFO_REDUCED=y

CONFIG_DEBUG_SPINLOCK=y
CONFIG_DEBUG_MUTEXES=y
CONFIG_DEBUG_LOCK_ALLOC=y
CONFIG_PROVE_LOCKING=y
CONFIG_LOCKDEP=y

(if not already enabled)

thanks in advance,
Herbert

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