===================================== WARNING: bad unlock balance detected! 5.9.0-syzkaller #0 Not tainted ------------------------------------- kworker/u4:3/24893 is trying to release lock ((wq_completion)phy264) at: [] flush_workqueue+0xe1/0x13e0 kernel/workqueue.c:2780 but there are no more locks to release! other info that might help us debug this: 3 locks held by kworker/u4:3/24893: #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline] #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline] #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline] #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline] #0: ffff8881407aa938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x821/0x15a0 kernel/workqueue.c:2243 #1: ffffc9000218fda8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x854/0x15a0 kernel/workqueue.c:2247 #2: ffffffff8c914010 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa00 net/core/net_namespace.c:566 stack backtrace: CPU: 1 PID: 24893 Comm: kworker/u4:3 Not tainted 5.9.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 print_unlock_imbalance_bug include/trace/events/lock.h:58 [inline] __lock_release kernel/locking/lockdep.c:5126 [inline] lock_release.cold+0x34/0x4e kernel/locking/lockdep.c:5462 flush_workqueue+0x125/0x13e0 kernel/workqueue.c:2784 drain_workqueue+0x1a5/0x3c0 kernel/workqueue.c:2948 destroy_workqueue+0x71/0x760 kernel/workqueue.c:4372 ieee80211_unregister_hw+0x1a2/0x210 net/mac80211/main.c:1388 mac80211_hwsim_del_radio drivers/net/wireless/mac80211_hwsim.c:3360 [inline] hwsim_exit_net+0x56b/0xc90 drivers/net/wireless/mac80211_hwsim.c:4115 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:604 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 device hsr_slave_1 left promiscuous mode batman_adv: batadv0: Removing interface: batadv_slave_0 batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device veth0_macvtap left promiscuous mode