Hello,
kernel test robot noticed "WARNING:suspicious_RCU_usage" on:
commit: e556fbe58fe8144bc9e7f0909344b22af53c05ce ("[PATCH net-next v1] net:
openvswitch: decouple flow_table from ovs_mutex")
url:
https://github.com/intel-lab-lkp/linux/commits/Adrian-Moreno/net-openvswitch-decouple-flow_table-from-ovs_mutex/20260314-152511
base: https://git.kernel.org/cgit/linux/kernel/git/davem/net-next.git
9089c5f3c444ad6e9eb172e9375615ed0b0bc31c
patch link:
https://lore.kernel.org/all/[email protected]/
patch subject: [PATCH net-next v1] net: openvswitch: decouple flow_table from
ovs_mutex
in testcase: boot
config: x86_64-randconfig-013-20260317
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G
(please refer to attached dmesg/kmsg for entire log/backtrace)
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 <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]
[ 67.815648][ T24] WARNING: suspicious RCU usage
[ 67.819156][ T24] 7.0.0-rc3-00655-ge556fbe58fe8 #1 Tainted: G
T
[ 67.821304][ T24] -----------------------------
[ 67.822695][ T24] net/openvswitch/datapath.c:2666 RCU-list traversed in
non-reader section!!
[ 67.825209][ T24]
[ 67.825209][ T24] other info that might help us debug this:
[ 67.825209][ T24]
[ 67.828074][ T24]
[ 67.828074][ T24] rcu_scheduler_active = 2, debug_locks = 1
[ 67.830500][ T24] 3 locks held by kworker/0:2/24:
[ 67.831886][ T24] #0: ffff88810007db40
((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works
(kernel/workqueue.c:3250)
[ 67.835011][ T24] #1: ffff88810184fd30
((work_completion)(&(&ovs_net->masks_rebalance)->work)){+.+.}-{0:0}, at:
process_scheduled_works (kernel/workqueue.c:3251)
[ 67.841040][ T24] #2: ffffffff96bd5220 (ovs_mutex){+.+.}-{4:4}, at:
ovs_dp_masks_rebalance (net/openvswitch/datapath.c:2666)
[ 67.843339][ T24]
[ 67.843339][ T24] stack backtrace:
[ 67.844454][ T24] CPU: 0 UID: 0 PID: 24 Comm: kworker/0:2 Tainted: G
T 7.0.0-rc3-00655-ge556fbe58fe8 #1 PREEMPT(lazy)
[ 67.846651][ T24] Tainted: [T]=RANDSTRUCT
[ 67.846651][ T24] Workqueue: events ovs_dp_masks_rebalance
[ 67.846651][ T24] Call Trace:
[ 67.846651][ T24] <TASK>
[ 67.846651][ T24] dump_stack_lvl (lib/dump_stack.c:123)
[ 67.846651][ T24] lockdep_rcu_suspicious (kernel/locking/lockdep.c:6877)
[ 67.846651][ T24] ovs_dp_masks_rebalance (net/openvswitch/datapath.c:?)
[ 67.846651][ T24] ? process_scheduled_works (kernel/workqueue.c:3251)
[ 67.846651][ T24] process_scheduled_works (kernel/workqueue.c:?)
[ 67.846651][ T24] worker_thread (kernel/workqueue.c:?)
[ 67.846651][ T24] ? _raw_spin_unlock_irqrestore
(arch/x86/include/asm/preempt.h:104 kernel/locking/spinlock.c:194)
[ 67.846651][ T24] kthread (kernel/kthread.c:438)
[ 67.846651][ T24] ? worker_attach_to_pool (kernel/workqueue.c:3385)
[ 67.846651][ T24] ? kthread_unuse_mm (kernel/kthread.c:381)
[ 67.846651][ T24] ret_from_fork (arch/x86/kernel/process.c:164)
[ 67.846651][ T24] ? kthread_unuse_mm (kernel/kthread.c:381)
[ 67.846651][ T24] ret_from_fork_asm (arch/x86/entry/entry_64.S:258)
[ 67.846651][ T24] </TASK>
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260318/[email protected]
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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