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Date: Fri, 14 Jun 2024 15:44:28 +0800
From: kernel test robot <oliver.sang@intel.com>
To: Jozsef Kadlecsik <kadlec@netfilter.org>
CC: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <linux-kernel@vger.kernel.org>,
	Pablo Neira Ayuso <pablo@netfilter.org>, Lion Ackermann <nnamrec@gmail.com>,
	<netfilter-devel@vger.kernel.org>, <coreteam@netfilter.org>,
	<oliver.sang@intel.com>
Subject: [linus:master] [netfilter]  4e7aaa6b82: WARNING:suspicious_RCU_usage
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Hello,

kernel test robot noticed "WARNING:suspicious_RCU_usage" on:

commit: 4e7aaa6b82d63e8ddcbfb56b4fd3d014ca586f10 ("netfilter: ipset: Fix race between namespace cleanup and gc in the list:set type")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on linux-next/master 6906a84c482f098d31486df8dc98cead21cce2d0]

in testcase: boot

compiler: clang-18
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+--------------------------------------------------------------------------------+------------+------------+
|                                                                                | c4ab9da85b | 4e7aaa6b82 |
+--------------------------------------------------------------------------------+------------+------------+
| WARNING:suspicious_RCU_usage                                                   | 0          | 6          |
| net/netfilter/ipset/ip_set_core.c:#suspicious_rcu_dereference_protected()usage | 0          | 6          |
+--------------------------------------------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202406141556.e0b6f17e-lkp@intel.com


[   33.826616][   T31] WARNING: suspicious RCU usage
[   33.826862][   T31] 6.10.0-rc2-00244-g4e7aaa6b82d6 #1 Not tainted
[   33.827175][   T31] -----------------------------
[   33.827419][   T31] net/netfilter/ipset/ip_set_core.c:1200 suspicious rcu_dereference_protected() usage!
[   33.827894][   T31]
[   33.827894][   T31] other info that might help us debug this:
[   33.827894][   T31]
[   33.828404][   T31]
[   33.828404][   T31] rcu_scheduler_active = 2, debug_locks = 1
[   33.828806][   T31] 3 locks held by kworker/u8:2/31:
[ 33.829109][ T31] #0: ffff8af0c1a58158 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works (kernel/workqueue.c:3206) 
[ 33.829668][ T31] #1: ffff8af0c466fe38 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works (kernel/workqueue.c:3207) 
[ 33.830204][ T31] #2: ffffffff8b263070 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net (net/core/net_namespace.c:597) 
[   33.830685][   T31]
[   33.830685][   T31] stack backtrace:
[   33.830983][   T31] CPU: 0 PID: 31 Comm: kworker/u8:2 Not tainted 6.10.0-rc2-00244-g4e7aaa6b82d6 #1
[   33.831438][   T31] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[   33.831947][   T31] Workqueue: netns cleanup_net
[   33.832193][   T31] Call Trace:
[   33.832366][   T31]  <TASK>
[ 33.832519][ T31] dump_stack_lvl (lib/dump_stack.c:116) 
[ 33.832769][ T31] lockdep_rcu_suspicious (include/linux/context_tracking.h:122) 
[ 33.833053][ T31] _destroy_all_sets (net/netfilter/ipset/ip_set_core.c:?) 
[ 33.833313][ T31] ip_set_net_exit (net/netfilter/ipset/ip_set_core.c:2397) 
[ 33.833554][ T31] cleanup_net (net/core/net_namespace.c:174 net/core/net_namespace.c:640) 
[ 33.833789][ T31] ? process_scheduled_works (kernel/workqueue.c:3206) 
[ 33.834080][ T31] process_scheduled_works (kernel/workqueue.c:3236) 
[ 33.834364][ T31] ? process_scheduled_works (kernel/workqueue.c:3207) 
[ 33.834664][ T31] worker_thread (kernel/workqueue.c:?) 
[ 33.834924][ T31] kthread (kernel/kthread.c:391) 
[ 33.835137][ T31] ? pr_cont_work (kernel/workqueue.c:3339) 
[ 33.835384][ T31] ? kthread_unuse_mm (kernel/kthread.c:342) 
[ 33.835645][ T31] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 33.835876][ T31] ? kthread_unuse_mm (kernel/kthread.c:342) 
[ 33.836137][ T31] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) 
[   33.836402][   T31]  </TASK>
[   33.836598][   T31]
[   33.836723][   T31] =============================
[   33.836976][   T31] WARNING: suspicious RCU usage
[   33.837221][   T31] 6.10.0-rc2-00244-g4e7aaa6b82d6 #1 Not tainted
[   33.837534][   T31] -----------------------------
[   33.837779][   T31] net/netfilter/ipset/ip_set_core.c:1211 suspicious rcu_dereference_protected() usage!
[   33.838255][   T31]
[   33.838255][   T31] other info that might help us debug this:
[   33.838255][   T31]
[   33.838760][   T31]
[   33.838760][   T31] rcu_scheduler_active = 2, debug_locks = 1
[   33.839161][   T31] 3 locks held by kworker/u8:2/31:
[ 33.839420][ T31] #0: ffff8af0c1a58158 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works (kernel/workqueue.c:3206) 
[ 33.839973][ T31] #1: ffff8af0c466fe38 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works (kernel/workqueue.c:3207) 
[ 33.840513][ T31] #2: ffffffff8b263070 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net (net/core/net_namespace.c:597) 
[   33.840998][   T31]
[   33.840998][   T31] stack backtrace:
[   33.841292][   T31] CPU: 0 PID: 31 Comm: kworker/u8:2 Not tainted 6.10.0-rc2-00244-g4e7aaa6b82d6 #1
[   33.841748][   T31] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[   33.842259][   T31] Workqueue: netns cleanup_net
[   33.842506][   T31] Call Trace:
[   33.842675][   T31]  <TASK>
[ 33.842827][ T31] dump_stack_lvl (lib/dump_stack.c:116) 
[ 33.843074][ T31] lockdep_rcu_suspicious (include/linux/context_tracking.h:122) 
[ 33.843355][ T31] _destroy_all_sets (net/netfilter/ipset/ip_set_core.c:?) 
[ 33.843613][ T31] ip_set_net_exit (net/netfilter/ipset/ip_set_core.c:2397) 
[ 33.843852][ T31] cleanup_net (net/core/net_namespace.c:174 net/core/net_namespace.c:640) 
[ 33.844087][ T31] ? process_scheduled_works (kernel/workqueue.c:3206) 
[ 33.844384][ T31] process_scheduled_works (kernel/workqueue.c:3236) 
[ 33.844668][ T31] ? process_scheduled_works (kernel/workqueue.c:3207) 
[ 33.844967][ T31] worker_thread (kernel/workqueue.c:?) 
[ 33.845212][ T31] kthread (kernel/kthread.c:391) 
[ 33.845424][ T31] ? pr_cont_work (kernel/workqueue.c:3339) 
[ 33.845668][ T31] ? kthread_unuse_mm (kernel/kthread.c:342) 
[ 33.845927][ T31] ret_from_fork (arch/x86/kernel/process.c:153) 
[ 33.846155][ T31] ? kthread_unuse_mm (kernel/kthread.c:342) 
[ 33.846416][ T31] ret_from_fork_asm (arch/x86/entry/entry_64.S:257) 
[   33.846673][   T31]  </TASK>


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240614/202406141556.e0b6f17e-lkp@intel.com


-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki