[ 721.178793][T19414] [ 721.178959][T19414] ============================= [ 721.179164][T19414] WARNING: suspicious RCU usage [ 721.179362][T19414] 7.0.0-rc3-virtme #1 Not tainted [ 721.179559][T19414] ----------------------------- [ 721.179762][T19414] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 721.180061][T19414] [ 721.180061][T19414] other info that might help us debug this: [ 721.180061][T19414] [ 721.180418][T19414] [ 721.180418][T19414] rcu_scheduler_active = 2, debug_locks = 1 [ 721.180638][T19414] 1 lock held by ip/19414: [ 721.180776][T19414] #0: ffffffff8de7f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 721.181021][T19414] [ 721.181021][T19414] stack backtrace: [ 721.181187][T19414] CPU: 0 UID: 0 PID: 19414 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 721.181190][T19414] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 721.181192][T19414] Call Trace: [ 721.181193][T19414] [ 721.181195][T19414] dump_stack_lvl+0x6f/0xa0 [ 721.181201][T19414] lockdep_rcu_suspicious.cold+0x4f/0xad [ 721.181206][T19414] fib6_update_sernum+0xfb/0x130 [ 721.181210][T19414] nh_rt_cache_flush+0x8d/0x380 [ 721.181215][T19414] replace_nexthop+0x347/0x6e0 [ 721.181220][T19414] insert_nexthop+0x41e/0x7a0 [ 721.181224][T19414] rtm_new_nexthop+0x3a0/0x8c0 [ 721.181227][T19414] ? insert_nexthop+0x7a0/0x7a0 [ 721.181229][T19414] ? lock_acquire.part.0+0xbc/0x260 [ 721.181232][T19414] ? find_held_lock+0x2b/0x80 [ 721.181238][T19414] ? lock_acquire.part.0+0xbc/0x260 [ 721.181239][T19414] ? find_held_lock+0x2b/0x80 [ 721.181245][T19414] ? find_held_lock+0x2b/0x80 [ 721.181246][T19414] ? insert_nexthop+0x7a0/0x7a0 [ 721.181248][T19414] ? __lock_release.isra.0+0x59/0x170 [ 721.181252][T19414] ? insert_nexthop+0x7a0/0x7a0 [ 721.181254][T19414] rtnetlink_rcv_msg+0x6fe/0xb90 [ 721.181259][T19414] ? rtnl_fdb_dump+0x620/0x620 [ 721.181261][T19414] ? __lock_acquire+0x577/0xc10 [ 721.181265][T19414] ? lock_acquire.part.0+0xbc/0x260 [ 721.181267][T19414] ? find_held_lock+0x2b/0x80 [ 721.181270][T19414] netlink_rcv_skb+0x123/0x380 [ 721.181274][T19414] ? rtnl_fdb_dump+0x620/0x620 [ 721.181279][T19414] ? netlink_ack+0xce0/0xce0 [ 721.181294][T19414] ? netlink_deliver_tap+0xc5/0x330 [ 721.181297][T19414] ? netlink_deliver_tap+0x13f/0x330 [ 721.181305][T19414] netlink_unicast+0x4a3/0x770 [ 721.181312][T19414] ? netlink_attachskb+0x810/0x810 [ 721.181315][T19414] ? __alloc_skb+0x4c4/0x5f0 [ 721.181319][T19414] ? napi_skb_cache_get+0x7a0/0x7a0 [ 721.181324][T19414] ? __lock_acquire+0x577/0xc10 [ 721.181331][T19414] netlink_sendmsg+0x735/0xc60 [ 721.181337][T19414] ? netlink_unicast+0x770/0x770 [ 721.181344][T19414] ? __might_fault+0x97/0x140 [ 721.181353][T19414] ____sys_sendmsg+0x419/0x850 [ 721.181357][T19414] ? copy_msghdr_from_user+0x270/0x430 [ 721.181361][T19414] ? get_timestamp.constprop.0+0x390/0x390 [ 721.181363][T19414] ? move_addr_to_kernel+0x40/0x40 [ 721.181371][T19414] ? lock_acquire.part.0+0xbc/0x260 [ 721.181373][T19414] ? find_held_lock+0x2b/0x80 [ 721.181379][T19414] ___sys_sendmsg+0xfd/0x180 [ 721.181383][T19414] ? copy_msghdr_from_user+0x430/0x430 [ 721.181385][T19414] ? __lock_release.isra.0+0x59/0x170 [ 721.181406][T19414] ? lock_vma_under_rcu+0x128/0x3e0 [ 721.181414][T19414] __sys_sendmsg+0x124/0x1c0 [ 721.181418][T19414] ? __sys_sendmsg_sock+0x20/0x20 [ 721.181429][T19414] ? do_user_addr_fault+0x799/0xdb0 [ 721.181434][T19414] ? rcu_is_watching+0x15/0xd0 [ 721.181439][T19414] ? rcu_is_watching+0x15/0xd0 [ 721.181445][T19414] do_syscall_64+0x117/0xfc0 [ 721.181450][T19414] ? exc_page_fault+0xaf/0xd0 [ 721.181455][T19414] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 721.181458][T19414] RIP: 0033:0x7f9d40b96c5e [ 721.181462][T19414] 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 [ 721.181465][T19414] RSP: 002b:00007ffd2a995850 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 721.181469][T19414] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f9d40b96c5e [ 721.181470][T19414] RDX: 0000000000000000 RSI: 00007ffd2a995910 RDI: 0000000000000005 [ 721.181472][T19414] RBP: 00007ffd2a995860 R08: 0000000000000000 R09: 0000000000000000 [ 721.181473][T19414] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 721.181474][T19414] R13: 0000000069b99d3d R14: 00007ffd2a996408 R15: 000000000049c620 [ 721.181485][T19414]