[ 814.133618][ T7819] [ 814.134449][ T7819] ============================= [ 814.134583][ T7819] WARNING: suspicious RCU usage [ 814.134708][ T7819] 7.0.0-rc3-virtme #1 Not tainted [ 814.135276][ T7819] ----------------------------- [ 814.135400][ T7819] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 814.135586][ T7819] [ 814.135586][ T7819] other info that might help us debug this: [ 814.135586][ T7819] [ 814.135832][ T7819] [ 814.135832][ T7819] rcu_scheduler_active = 2, debug_locks = 1 [ 814.136015][ T7819] 1 lock held by ip/7819: [ 814.136110][ T7819] #0: ffffffff9887f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 814.136336][ T7819] [ 814.136336][ T7819] stack backtrace: [ 814.136498][ T7819] CPU: 3 UID: 0 PID: 7819 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 814.136501][ T7819] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 814.136503][ T7819] Call Trace: [ 814.136504][ T7819] [ 814.136506][ T7819] dump_stack_lvl+0x6f/0xa0 [ 814.136511][ T7819] lockdep_rcu_suspicious.cold+0x4f/0xad [ 814.136517][ T7819] fib6_update_sernum+0xfb/0x130 [ 814.136521][ T7819] nh_rt_cache_flush+0x8d/0x380 [ 814.136525][ T7819] replace_nexthop+0x347/0x6e0 [ 814.136530][ T7819] insert_nexthop+0x41e/0x7a0 [ 814.136534][ T7819] rtm_new_nexthop+0x3a0/0x8c0 [ 814.136537][ T7819] ? insert_nexthop+0x7a0/0x7a0 [ 814.136539][ T7819] ? lock_acquire.part.0+0xbc/0x260 [ 814.136542][ T7819] ? find_held_lock+0x2b/0x80 [ 814.136548][ T7819] ? lock_acquire.part.0+0xbc/0x260 [ 814.136549][ T7819] ? find_held_lock+0x2b/0x80 [ 814.136554][ T7819] ? find_held_lock+0x2b/0x80 [ 814.136556][ T7819] ? insert_nexthop+0x7a0/0x7a0 [ 814.136558][ T7819] ? __lock_release.isra.0+0x59/0x170 [ 814.136561][ T7819] ? insert_nexthop+0x7a0/0x7a0 [ 814.136563][ T7819] rtnetlink_rcv_msg+0x6fe/0xb90 [ 814.136568][ T7819] ? rtnl_fdb_dump+0x620/0x620 [ 814.136571][ T7819] ? __lock_acquire+0x577/0xc10 [ 814.136574][ T7819] ? lock_acquire.part.0+0xbc/0x260 [ 814.136576][ T7819] ? find_held_lock+0x2b/0x80 [ 814.136579][ T7819] netlink_rcv_skb+0x123/0x380 [ 814.136582][ T7819] ? rtnl_fdb_dump+0x620/0x620 [ 814.136586][ T7819] ? netlink_ack+0xce0/0xce0 [ 814.136592][ T7819] ? netlink_deliver_tap+0xc5/0x330 [ 814.136594][ T7819] ? netlink_deliver_tap+0x13f/0x330 [ 814.136598][ T7819] netlink_unicast+0x4a3/0x770 [ 814.136602][ T7819] ? netlink_attachskb+0x810/0x810 [ 814.136604][ T7819] ? __alloc_skb+0x4c4/0x5f0 [ 814.136607][ T7819] ? napi_skb_cache_get+0x7a0/0x7a0 [ 814.136610][ T7819] ? __lock_acquire+0x577/0xc10 [ 814.136613][ T7819] netlink_sendmsg+0x735/0xc60 [ 814.136617][ T7819] ? netlink_unicast+0x770/0x770 [ 814.136621][ T7819] ? __might_fault+0x97/0x140 [ 814.136627][ T7819] ____sys_sendmsg+0x419/0x850 [ 814.136630][ T7819] ? copy_msghdr_from_user+0x270/0x430 [ 814.136632][ T7819] ? get_timestamp.constprop.0+0x390/0x390 [ 814.136633][ T7819] ? move_addr_to_kernel+0x40/0x40 [ 814.136638][ T7819] ? lock_acquire.part.0+0xbc/0x260 [ 814.136639][ T7819] ? find_held_lock+0x2b/0x80 [ 814.136642][ T7819] ___sys_sendmsg+0xfd/0x180 [ 814.136644][ T7819] ? copy_msghdr_from_user+0x430/0x430 [ 814.136646][ T7819] ? __lock_release.isra.0+0x59/0x170 [ 814.136656][ T7819] ? lock_vma_under_rcu+0x128/0x3e0 [ 814.136661][ T7819] __sys_sendmsg+0x124/0x1c0 [ 814.136664][ T7819] ? __sys_sendmsg_sock+0x20/0x20 [ 814.136669][ T7819] ? do_user_addr_fault+0x799/0xdb0 [ 814.136673][ T7819] ? rcu_is_watching+0x15/0xd0 [ 814.136677][ T7819] ? rcu_is_watching+0x15/0xd0 [ 814.136680][ T7819] do_syscall_64+0x117/0xfc0 [ 814.136684][ T7819] ? exc_page_fault+0xaf/0xd0 [ 814.136687][ T7819] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 814.136689][ T7819] RIP: 0033:0x7f0062dd4c5e [ 814.136693][ T7819] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa [ 814.136694][ T7819] RSP: 002b:00007fff4aca73c0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 814.136697][ T7819] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f0062dd4c5e [ 814.136698][ T7819] RDX: 0000000000000000 RSI: 00007fff4aca7480 RDI: 0000000000000005 [ 814.136700][ T7819] RBP: 00007fff4aca73d0 R08: 0000000000000000 R09: 0000000000000000 [ 814.136700][ T7819] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 814.136701][ T7819] R13: 0000000069b99df4 R14: 00000000198ac310 R15: 000000000049c620 [ 814.136707][ T7819]