From: Ingo Molnar <mingo@elte.hu>
To: Dave Jones <davej@redhat.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
x86@kernel.org, "Paul E. McKenney" <paulmck@us.ibm.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: rcu stall.
Date: Wed, 20 Apr 2011 10:36:16 +0200 [thread overview]
Message-ID: <20110420083616.GA1124@elte.hu> (raw)
In-Reply-To: <20110420020215.GA30081@redhat.com>
* Dave Jones <davej@redhat.com> wrote:
> Machine was under heavy load (300 or so running processes
> calling random system calls). The rcu stall detector kicked in,
> spewed this, and then the machine completely locked up.
Without having looked at it in detail, isnt this a lockup somewhere in the
wireless code:
> [<ffffffff8114f842>] ? simple_release_fs+0x22/0x57
> [<ffffffff81082e4f>] ? arch_local_irq_restore+0x6/0xd
> [<ffffffff81084df8>] lock_acquired+0x20f/0x21e
> [<ffffffff814be9cc>] _raw_spin_lock+0x62/0x6a
> [<ffffffff8114f842>] ? simple_release_fs+0x22/0x57
> [<ffffffff814bf215>] ? _raw_spin_unlock+0x28/0x2c
> [<ffffffff8114f842>] simple_release_fs+0x22/0x57
> [<ffffffff811f53e9>] debugfs_remove_recursive+0x11f/0x16b
> [<ffffffffa037adf3>] ieee80211_debugfs_key_remove+0x1f/0x2e [mac80211]
> [<ffffffffa0373e7a>] __ieee80211_key_destroy+0x61/0x6d [mac80211]
> [<ffffffffa0374250>] ieee80211_key_link+0x12c/0x165 [mac80211]
> [<ffffffffa036b90e>] ieee80211_add_key+0xfb/0x133 [mac80211]
> [<ffffffffa0277ff4>] nl80211_new_key+0xe5/0x106 [cfg80211]
> [<ffffffffa026d2c5>] ? cfg80211_get_dev_from_ifindex+0x72/0x7a [cfg80211]
> [<ffffffff81422244>] genl_rcv_msg+0x1dc/0x207
> [<ffffffff81422068>] ? genl_rcv+0x2d/0x2d
> [<ffffffff81421c69>] netlink_rcv_skb+0x43/0x8f
> [<ffffffff81422061>] genl_rcv+0x26/0x2d
> [<ffffffff8142176a>] netlink_unicast+0xec/0x156
> [<ffffffff81421a53>] netlink_sendmsg+0x27f/0x2c0
> [<ffffffff813ed78c>] __sock_sendmsg+0x69/0x75
> [<ffffffff813ed905>] sock_sendmsg+0xa1/0xb6
> [<ffffffff81086c30>] ? lock_release+0x181/0x18e
> [<ffffffff81100de0>] ? might_fault+0xa5/0xac
> [<ffffffff81100d97>] ? might_fault+0x5c/0xac
> [<ffffffff813ec8e4>] ? copy_from_user+0x2f/0x31
> [<ffffffff813f707a>] ? copy_from_user+0x2f/0x31
> [<ffffffff813f7370>] ? verify_iovec+0x52/0xa6
> [<ffffffff813eece3>] sys_sendmsg+0x23a/0x2b8
> [<ffffffff81086d29>] ? lock_acquire+0xec/0xfb
> [<ffffffff81086c30>] ? lock_release+0x181/0x18e
> [<ffffffff8114b7d7>] ? mntput+0x26/0x28
> [<ffffffff811343bc>] ? fput+0x1e6/0x1f5
> [<ffffffff8113ba95>] ? path_put+0x1f/0x23
> [<ffffffff810a9f23>] ? audit_syscall_entry+0x11c/0x148
> [<ffffffff81255e4e>] ? trace_hardirqs_on_thunk+0x3a/0x3f
> [<ffffffff814c5d82>] system_call_fastpath+0x16/0x1b
RCU stall detector is simply the first thing that noticed the hang. Enabling
the regular lockup detector would probably have resulted in a similar looking
hang.
Thanks,
Ingo
next prev parent reply other threads:[~2011-04-20 8:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-20 2:02 rcu stall Dave Jones
2011-04-20 8:36 ` Ingo Molnar [this message]
2011-04-20 18:30 ` Paul E. McKenney
[not found] <56F1A8F2.9000905@sandisk.com>
2016-03-22 20:45 ` RCU stall Paul E. McKenney
2016-03-22 23:53 ` Bart Van Assche
2016-03-23 1:59 ` Paul E. McKenney
2016-03-23 2:29 ` Paul E. McKenney
2016-03-24 20:24 ` Bart Van Assche
2016-03-24 20:46 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110420083616.GA1124@elte.hu \
--to=mingo@elte.hu \
--cc=a.p.zijlstra@chello.nl \
--cc=davej@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=paulmck@us.ibm.com \
--cc=x86@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.