From: Anders Roxell <anders.roxell@linaro.org>
To: paulmck@kernel.org, joel@joelfernandes.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
davem@davemloft.net, kuznet@ms2.inr.ac.ru,
yoshfuji@linux-ipv6.org
Subject: next-20191108: qemu arm64: WARNING: suspicious RCU usage
Date: Mon, 11 Nov 2019 08:59:25 +0100 [thread overview]
Message-ID: <20191111075925.GB25277@localhost.localdomain> (raw)
Hi,
I'm seeing the following warning when I'm booting an arm64 allmodconfig
kernel [1] on linux-next tag next-20191108, is this anything you've seen
before ?
The code seems to have introduced that is f0ad0860d01e ("ipv4: ipmr:
support multiple tables") in 2010 and the warning was added reacently
28875945ba98 ("rcu: Add support for consolidated-RCU reader checking").
[ 32.496021][ T1] =============================
[ 32.497616][ T1] WARNING: suspicious RCU usage
[ 32.499614][ T1] 5.4.0-rc6-next-20191108-00003-gf74bac957b5c-dirty #2 Not tainted
[ 32.502018][ T1] -----------------------------
[ 32.503976][ T1] net/ipv4/ipmr.c:136 RCU-list traversed in non-reader section!!
[ 32.506746][ T1]
[ 32.506746][ T1] other info that might help us debug this:
[ 32.506746][ T1]
[ 32.509794][ T1]
[ 32.509794][ T1] rcu_scheduler_active = 2, debug_locks = 1
[ 32.512661][ T1] 1 lock held by swapper/0/1:
[ 32.514169][ T1] #0: ffffa000150dd678 (pernet_ops_rwsem){+.+.}, at: register_pernet_subsys+0x24/0x50
[ 32.517621][ T1]
[ 32.517621][ T1] stack backtrace:
[ 32.519930][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.4.0-rc6-next-20191108-00003-gf74bac957b5c-dirty #2
[ 32.523063][ T1] Hardware name: linux,dummy-virt (DT)
[ 32.524787][ T1] Call trace:
[ 32.525946][ T1] dump_backtrace+0x0/0x2d0
[ 32.527433][ T1] show_stack+0x20/0x30
[ 32.528811][ T1] dump_stack+0x204/0x2ac
[ 32.530258][ T1] lockdep_rcu_suspicious+0xf4/0x108
[ 32.531993][ T1] ipmr_get_table+0xc8/0x170
[ 32.533496][ T1] ipmr_new_table+0x48/0xa0
[ 32.535002][ T1] ipmr_net_init+0xe8/0x258
[ 32.536465][ T1] ops_init+0x280/0x2d8
[ 32.537876][ T1] register_pernet_operations+0x210/0x420
[ 32.539707][ T1] register_pernet_subsys+0x30/0x50
[ 32.541372][ T1] ip_mr_init+0x54/0x180
[ 32.542785][ T1] inet_init+0x25c/0x3e8
[ 32.544186][ T1] do_one_initcall+0x4c0/0xad8
[ 32.545757][ T1] kernel_init_freeable+0x3e0/0x500
[ 32.547443][ T1] kernel_init+0x14/0x1f0
[ 32.548875][ T1] ret_from_fork+0x10/0x18
Cheers,
Anders
[1] http://people.linaro.org/~anders.roxell/kernel_config-next-20191108.config
next reply other threads:[~2019-11-11 8:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-11 7:59 Anders Roxell [this message]
2019-11-11 13:34 ` next-20191108: qemu arm64: WARNING: suspicious RCU usage Paul E. McKenney
2019-11-13 9:11 ` Anders Roxell
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=20191111075925.GB25277@localhost.localdomain \
--to=anders.roxell@linaro.org \
--cc=davem@davemloft.net \
--cc=joel@joelfernandes.org \
--cc=kuznet@ms2.inr.ac.ru \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=paulmck@kernel.org \
--cc=yoshfuji@linux-ipv6.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