Re: [PATCHv2 dlm/next 10/12] dlm: separate dlm lockspaces per net-namespace

From: kernel test robot
Date: Fri Oct 11 2024 - 02:20:30 EST



Hello,

kernel test robot noticed "fs/dlm/midcomms.c:#RCU-list_traversed_in_non-reader_section" on:

commit: e89c4c2902364b7dda0fda243da1b7e84a1faae5 ("[PATCHv2 dlm/next 10/12] dlm: separate dlm lockspaces per net-namespace")
url: https://github.com/intel-lab-lkp/linux/commits/Alexander-Aring/dlm-introduce-dlm_find_lockspace_name/20241001-041944
base: https://git.kernel.org/cgit/linux/kernel/git/gregkh/driver-core.git ad46e8f95e931e113cb98253daf6d443ac244cde
patch link: https://lore.kernel.org/all/20240930201358.2638665-11-aahringo@xxxxxxxxxx/
patch subject: [PATCHv2 dlm/next 10/12] dlm: separate dlm lockspaces per net-namespace

in testcase: trinity
version:
with following parameters:

runtime: 300s
group: group-00
nr_groups: 5



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)


+-------------------------------------------------------------------------+------------+------------+
| | 7bd2eb99b7 | e89c4c2902 |
+-------------------------------------------------------------------------+------------+------------+
| fs/dlm/midcomms.c:#RCU-list_traversed_in_non-reader_section | 0 | 12 |
| fs/dlm/lowcomms.c:#RCU-list_traversed_in_non-reader_section | 0 | 12 |
+-------------------------------------------------------------------------+------------+------------+


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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-lkp/202410111400.130b9d53-lkp@xxxxxxxxx


[ 35.412526][ T331] WARNING: suspicious RCU usage
[ 35.412943][ T331] 6.11.0-11738-ge89c4c290236 #1 Not tainted
[ 35.413404][ T331] -----------------------------
[ 35.413801][ T331] fs/dlm/midcomms.c:1170 RCU-list traversed in non-reader section!!
[ 35.414429][ T331]
[ 35.414429][ T331] other info that might help us debug this:
[ 35.414429][ T331]
[ 35.415231][ T331]
[ 35.415231][ T331] rcu_scheduler_active = 2, debug_locks = 1
[ 35.415867][ T331] 4 locks held by kworker/u8:1/331:
[ 35.416277][ T331] #0: 83de38c4 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:?)
[ 35.417037][ T331] #1: ed2b9f04 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:?)
[ 35.417746][ T331] #2: 82eec22c (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net (net/core/net_namespace.c:583)
[ 35.418427][ T331] #3: eaba3c70 (&dn->nodes_srcu){.+.+}-{0:0}, at: srcu_lock_acquire (include/linux/srcu.h:150)
[ 35.419124][ T331]
[ 35.419124][ T331] stack backtrace:
[ 35.419618][ T331] CPU: 0 UID: 0 PID: 331 Comm: kworker/u8:1 Not tainted 6.11.0-11738-ge89c4c290236 #1
[ 35.420349][ T331] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 35.421318][ T331] Workqueue: netns cleanup_net
[ 35.422067][ T331] Call Trace:
[ 35.422612][ T331] dump_stack_lvl (lib/dump_stack.c:122)
[ 35.423303][ T331] dump_stack (lib/dump_stack.c:129)
[ 35.423991][ T331] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6803)
[ 35.424808][ T331] dlm_midcomms_exit (fs/dlm/midcomms.c:?)
[ 35.425565][ T331] dlm_net_exit (fs/dlm/config.c:70)
[ 35.426219][ T331] cleanup_net (net/core/net_namespace.c:174 net/core/net_namespace.c:626)
[ 35.426927][ T331] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 35.427809][ T331] process_one_work (kernel/workqueue.c:3234)
[ 35.428581][ T331] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 35.429358][ T331] kthread (kernel/kthread.c:391)
[ 35.430046][ T331] ? pr_cont_work (kernel/workqueue.c:3337)
[ 35.430782][ T331] ? kthread_blkcg (kernel/kthread.c:342)
[ 35.431480][ T331] ? kthread_blkcg (kernel/kthread.c:342)
[ 35.432219][ T331] ret_from_fork (arch/x86/kernel/process.c:153)
[ 35.432972][ T331] ret_from_fork_asm (??:?)
[ 35.433732][ T331] entry_INT80_32 (init_task.c:?)
[ 35.434945][ T331]
[ 35.435452][ T331] =============================
[ 35.436245][ T331] WARNING: suspicious RCU usage
[ 35.437033][ T331] 6.11.0-11738-ge89c4c290236 #1 Not tainted
[ 35.440279][ T331] -----------------------------
[ 35.442812][ T331] fs/dlm/lowcomms.c:1961 RCU-list traversed in non-reader section!!
[ 35.446360][ T331]
[ 35.446360][ T331] other info that might help us debug this:
[ 35.446360][ T331]
[ 35.450959][ T331]
[ 35.450959][ T331] rcu_scheduler_active = 2, debug_locks = 1
[ 35.454214][ T331] 4 locks held by kworker/u8:1/331:
[ 35.456221][ T331] #0: 83de38c4 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:?)
[ 35.459107][ T331] #1: ed2b9f04 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work (kernel/workqueue.c:?)
[ 35.461940][ T331] #2: 82eec22c (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net (net/core/net_namespace.c:583)
[ 35.464777][ T331] #3: eaba3afc (&dn->connections_srcu){.+.+}-{0:0}, at: srcu_lock_acquire (include/linux/srcu.h:150)
[ 35.472495][ T331]
[ 35.472495][ T331] stack backtrace:
[ 35.473301][ T331] CPU: 0 UID: 0 PID: 331 Comm: kworker/u8:1 Not tainted 6.11.0-11738-ge89c4c290236 #1
[ 35.474444][ T331] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
[ 35.475498][ T331] Workqueue: netns cleanup_net
[ 35.475954][ T331] Call Trace:
[ 35.476282][ T331] dump_stack_lvl (lib/dump_stack.c:122)
[ 35.476700][ T331] dump_stack (lib/dump_stack.c:129)
[ 35.477272][ T331] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6803)
[ 35.478275][ T331] dlm_lowcomms_exit (fs/dlm/lowcomms.c:?)
[ 35.479318][ T331] dlm_midcomms_exit (fs/dlm/midcomms.c:1186)
[ 35.480266][ T331] dlm_net_exit (fs/dlm/config.c:70)
[ 35.481123][ T331] cleanup_net (net/core/net_namespace.c:174 net/core/net_namespace.c:626)
[ 35.481942][ T331] ? __this_cpu_preempt_check (lib/smp_processor_id.c:67)
[ 35.482925][ T331] process_one_work (kernel/workqueue.c:3234)
[ 35.483825][ T331] worker_thread (kernel/workqueue.c:3304 kernel/workqueue.c:3391)
[ 35.484571][ T331] kthread (kernel/kthread.c:391)
[ 35.485382][ T331] ? pr_cont_work (kernel/workqueue.c:3337)
[ 35.486288][ T331] ? kthread_blkcg (kernel/kthread.c:342)
[ 35.487171][ T331] ? kthread_blkcg (kernel/kthread.c:342)
[ 35.488014][ T331] ret_from_fork (arch/x86/kernel/process.c:153)
[ 35.488786][ T331] ret_from_fork_asm (??:?)
[ 35.489648][ T331] entry_INT80_32 (init_task.c:?)



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20241011/202410111400.130b9d53-lkp@xxxxxxxxx



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