============================= WARNING: suspicious RCU usage 6.9.0-rc7-syzkaller-00116-g4c639b6a7b9d #0 Not tainted ----------------------------- net/bridge/br_private.h:1599 suspicious rcu_dereference_protected() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 2 locks held by syz-executor.0/19307: #0: ffffc900035a7b20 ((&p->forward_delay_timer)){+.-.}-{0:0}, at: call_timer_fn+0xc0/0x650 kernel/time/timer.c:1790 #1: ffff888061d38cb8 (&br->lock){+.-.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #1: ffff888061d38cb8 (&br->lock){+.-.}-{2:2}, at: br_forward_delay_timer_expired+0x50/0x440 net/bridge/br_stp_timer.c:86 stack backtrace: CPU: 1 PID: 19307 Comm: syz-executor.0 Not tainted 6.9.0-rc7-syzkaller-00116-g4c639b6a7b9d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 lockdep_rcu_suspicious+0x221/0x340 kernel/locking/lockdep.c:6712 nbp_vlan_group net/bridge/br_private.h:1599 [inline] br_mst_set_state+0x1ea/0x650 net/bridge/br_mst.c:105 br_set_state+0x28a/0x7b0 net/bridge/br_stp.c:47 br_forward_delay_timer_expired+0x176/0x440 net/bridge/br_stp_timer.c:88 call_timer_fn+0x18e/0x650 kernel/time/timer.c:1793 expire_timers kernel/time/timer.c:1844 [inline] __run_timers kernel/time/timer.c:2418 [inline] __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2429 run_timer_base kernel/time/timer.c:2438 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2448 handle_softirqs+0x2d6/0x990 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu+0xf4/0x1c0 kernel/softirq.c:637 irq_exit_rcu+0x9/0x30 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x57/0xc0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0033:0x7f3bfca39b7b Code: 8d 45 f8 48 39 d1 0f 83 e5 00 00 00 0f 1f 00 48 89 50 08 48 89 c6 48 8b 50 f8 48 83 e8 08 48 39 d1 72 ec 49 83 c5 08 48 89 0e <4c> 39 eb 75 c8 48 89 ea eb 0d 0f 1f 00 48 8b 70 08 48 39 72 f8 74 RSP: 002b:00007ffe9e09c050 EFLAGS: 00000212 RAX: 00007f3bfc204ac0 RBX: 00007f3bfc207b30 RCX: ffffffff81429cda RDX: ffffffff81429cda RSI: 00007f3bfc204ac8 RDI: 00007f3bfc201010 RBP: 00007f3bfc201008 R08: 00007f3bfc201068 R09: 00000000000000e7 R10: 000000008136afde R11: 0000000000000001 R12: 0000001b2ec22f3c R13: 00007f3bfc204ad0 R14: 00007f3bfcba0000 R15: 00007f3bfcbac018 bridge0: port 1(team0) entered learning state