From: Bagas Sanjaya <bagasdotme@gmail.com>
To: Lai Jiangshan <laijs@linux.alibaba.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Gregory Greenman <gregory.greenman@intel.com>,
Dave Hansen <dave.hansen@linux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux Networking <netdev@vger.kernel.org>,
Linux Wireless <linux-wireless@vger.kernel.org>,
Linux RCU <rcu@vger.kernel.org>
Subject: Fwd: RCU indicates stalls with iwlwifi, causing boot failures
Date: Sat, 2 Sep 2023 07:29:55 +0700 [thread overview]
Message-ID: <c1caa7c1-b2c6-aac5-54ab-8bcc6e139ca8@gmail.com> (raw)
Hi,
I notice a bug report on Bugzilla [1]. Quoting from it:
> I'm seeing RCU warnings in Linus's current tree (like 87dfd85c38923acd9517e8df4afc908565df0961) that come from RCU:
>
> WARNING: CPU: 0 PID: 0 at kernel/rcu/tree_exp.h:787 rcu_exp_handler+0x35/0xe0
>
> But they *ONLY* occur on a system with a newer iwlwifi device:
>
> aa:00.0 Network controller: Intel Corporation Wi-Fi 6 AX210/AX211/AX411 160MHz (rev 1a)
>
> and never in a VM or on an older device (like an 8260). During a bisect the only seem to occur with the "83" version of the firmware.
>
> iwlwifi 0000:aa:00.0: loaded firmware version 83.e8f84e98.0 ty-a0-gf-a0-83.ucode op_mode iwlmvm
>
> The first warning gets spit out within a millisecond of the last printk() from the iwlwifi driver. They eventually result in a big spew of RCU messages like this:
>
> [ 27.124796] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 125 jiffies s: 193 root: 0x1/.
> [ 27.126466] rcu: blocking rcu_node structures (internal RCU debug):
> [ 27.128114] Sending NMI from CPU 3 to CPUs 0:
> [ 27.128122] NMI backtrace for cpu 0 skipped: idling at intel_idle+0x5f/0xb0
> [ 27.159757] loop30: detected capacity change from 0 to 8
> [ 27.204967] rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-...D } 145 jiffies s: 193 root: 0x1/.
> [ 27.206353] rcu: blocking rcu_node structures (internal RCU debug):
> [ 27.207751] Sending NMI from CPU 3 to CPUs 0:
> [ 27.207825] NMI backtrace for cpu 0 skipped: idling at intel_idle+0x5f/0xb0
>
> I usually see them at boot. In that case, they usually hang the system and keep it from booting. I've also encountered them at reboots and also seen them *not* be fatal at boot. I suspect it has to do with which CPU gets wedged.
See Bugzilla for the full thread and attached full dmesg output.
Thanks.
[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217856
--
An old man doll... just what I always wanted! - Clara
next reply other threads:[~2023-09-02 0:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-02 0:29 Bagas Sanjaya [this message]
2023-09-02 2:07 ` Fwd: RCU indicates stalls with iwlwifi, causing boot failures Ben Greear
2023-09-02 6:59 ` Hugh Dickins
2023-09-02 15:59 ` Hugh Dickins
2023-09-05 16:21 ` Dave Hansen
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=c1caa7c1-b2c6-aac5-54ab-8bcc6e139ca8@gmail.com \
--to=bagasdotme@gmail.com \
--cc=dave.hansen@linux.intel.com \
--cc=gregory.greenman@intel.com \
--cc=laijs@linux.alibaba.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paulmck@kernel.org \
--cc=rcu@vger.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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).