From: Maxim Wexler <maxim.wexler@gmail.com>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] unstoppable, undeciperable kernel call trace in log
Date: Sat, 30 Jun 2012 21:11:13 -0600 [thread overview]
Message-ID: <CAN_TFxMnnWuGd6QaaPf5yxGUc=eE4xsg6QqFsUpxbszedR4ECA@mail.gmail.com> (raw)
In-Reply-To: <CAEH5T2PMed-EM6czgzgYeh_FPX-BO2wOf9OSv5qL3We582N=cQ@mail.gmail.com>
> Hi,
>
> I don't have an answer, but if you google the phrase "rcu_bh detected
> stall on CPU" you can find many reports similar to yours and maybe
> some information.
This might be usefu
lhttp://www.kernel.org/doc/Documentation/RCU/stallwarn.txt
"RCU bugs can often be debugged with the help of CONFIG_RCU_TRACE"
from <help> in menuconfig.
│ This option provides tracing in RCU which presents stats │
│ in debugfs for debugging RCU implementation.
Ok, so I've set the RCU_TRACE=y. Next question: How do I use debugfs,
never used it before?
>
> Do you have RCU_CPU_STALL_INFO=y in your kernel config?
no.
syzygy@lumby ~ $ grep RCU /usr/src/linux/.config
# RCU Subsystem
CONFIG_TREE_RCU=y
# CONFIG_PREEMPT_RCU is not set
# CONFIG_RCU_TRACE is not set
CONFIG_RCU_FANOUT=32
# CONFIG_RCU_FANOUT_EXACT is not set
# CONFIG_RCU_FAST_NO_HZ is not set
# CONFIG_TREE_RCU_TRACE is not set
# CONFIG_SPARSE_RCU_POINTER is not set
CONFIG_RCU_CPU_STALL_TIMEOUT=60
next prev parent reply other threads:[~2012-07-01 3:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-30 21:57 [gentoo-user] unstoppable, undeciperable kernel call trace in log Maxim Wexler
2012-07-01 1:25 ` Paul Hartman
2012-07-01 3:11 ` Maxim Wexler [this message]
2012-07-01 3:46 ` Maxim Wexler
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