[ 560.876690][T17451] [ 560.876958][T17451] ============================= [ 560.877172][T17451] WARNING: suspicious RCU usage [ 560.877368][T17451] 7.0.0-rc1-virtme #1 Not tainted [ 560.877558][T17451] ----------------------------- [ 560.877744][T17451] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 560.878012][T17451] [ 560.878012][T17451] other info that might help us debug this: [ 560.878012][T17451] [ 560.878369][T17451] [ 560.878369][T17451] rcu_scheduler_active = 2, debug_locks = 1 [ 560.878622][T17451] 1 lock held by ip/17451: [ 560.878840][T17451] #0: ffffffff9727e6e8 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 560.879172][T17451] [ 560.879172][T17451] stack backtrace: [ 560.879414][T17451] CPU: 2 UID: 0 PID: 17451 Comm: ip Not tainted 7.0.0-rc1-virtme #1 PREEMPT(full) [ 560.879419][T17451] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 560.879421][T17451] Call Trace: [ 560.879423][T17451] [ 560.879425][T17451] dump_stack_lvl+0x6f/0xa0 [ 560.879432][T17451] lockdep_rcu_suspicious.cold+0x4f/0xad [ 560.879438][T17451] fib6_update_sernum+0xfb/0x130 [ 560.879442][T17451] nh_rt_cache_flush+0x8d/0x380 [ 560.879447][T17451] replace_nexthop+0x347/0x6e0 [ 560.879452][T17451] insert_nexthop+0x41e/0x7a0 [ 560.879456][T17451] rtm_new_nexthop+0x3a0/0x8c0 [ 560.879459][T17451] ? insert_nexthop+0x7a0/0x7a0 [ 560.879461][T17451] ? lock_acquire.part.0+0xbc/0x260 [ 560.879464][T17451] ? find_held_lock+0x2b/0x80 [ 560.879470][T17451] ? lock_acquire.part.0+0xbc/0x260 [ 560.879472][T17451] ? find_held_lock+0x2b/0x80 [ 560.879477][T17451] ? find_held_lock+0x2b/0x80 [ 560.879479][T17451] ? insert_nexthop+0x7a0/0x7a0 [ 560.879481][T17451] ? __lock_release.isra.0+0x59/0x170 [ 560.879484][T17451] ? insert_nexthop+0x7a0/0x7a0 [ 560.879486][T17451] rtnetlink_rcv_msg+0x6fe/0xb90 [ 560.879492][T17451] ? rtnl_fdb_dump+0x620/0x620 [ 560.879494][T17451] ? __lock_acquire+0x577/0xc10 [ 560.879498][T17451] ? lock_acquire.part.0+0xbc/0x260 [ 560.879499][T17451] ? find_held_lock+0x2b/0x80 [ 560.879502][T17451] netlink_rcv_skb+0x123/0x380 [ 560.879506][T17451] ? rtnl_fdb_dump+0x620/0x620 [ 560.879509][T17451] ? netlink_ack+0xcc0/0xcc0 [ 560.879516][T17451] ? netlink_deliver_tap+0xc5/0x330 [ 560.879518][T17451] ? netlink_deliver_tap+0x13f/0x330 [ 560.879522][T17451] netlink_unicast+0x4a3/0x770 [ 560.879526][T17451] ? netlink_attachskb+0x810/0x810 [ 560.879528][T17451] ? __alloc_skb+0x4cd/0x600 [ 560.879531][T17451] ? napi_skb_cache_get+0x7a0/0x7a0 [ 560.879534][T17451] ? __lock_acquire+0x577/0xc10 [ 560.879538][T17451] netlink_sendmsg+0x735/0xc60 [ 560.879542][T17451] ? netlink_unicast+0x770/0x770 [ 560.879548][T17451] ? __might_fault+0x97/0x140 [ 560.879556][T17451] ____sys_sendmsg+0x419/0x850 [ 560.879559][T17451] ? copy_msghdr_from_user+0x270/0x430 [ 560.879562][T17451] ? get_timestamp.constprop.0+0x3a0/0x3a0 [ 560.879564][T17451] ? move_addr_to_kernel+0x40/0x40 [ 560.879571][T17451] ? lock_acquire.part.0+0xbc/0x260 [ 560.879573][T17451] ? find_held_lock+0x2b/0x80 [ 560.879578][T17451] ___sys_sendmsg+0xfd/0x180 [ 560.879581][T17451] ? copy_msghdr_from_user+0x430/0x430 [ 560.879583][T17451] ? __lock_release.isra.0+0x59/0x170 [ 560.879594][T17451] ? lock_vma_under_rcu+0x128/0x3e0 [ 560.879599][T17451] __sys_sendmsg+0x124/0x1c0 [ 560.879602][T17451] ? __sys_sendmsg_sock+0x20/0x20 [ 560.879607][T17451] ? do_user_addr_fault+0x799/0xdb0 [ 560.879611][T17451] ? rcu_is_watching+0x15/0xd0 [ 560.879615][T17451] ? rcu_is_watching+0x15/0xd0 [ 560.879618][T17451] do_syscall_64+0x117/0xfc0 [ 560.879622][T17451] ? exc_page_fault+0xaf/0xd0 [ 560.879625][T17451] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 560.879628][T17451] RIP: 0033:0x7f76832dbc5e [ 560.879632][T17451] 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 [ 560.879634][T17451] RSP: 002b:00007fff7d820ee0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 560.879638][T17451] RAX: ffffffffffffffda RBX: 000000000048a910 RCX: 00007f76832dbc5e [ 560.879639][T17451] RDX: 0000000000000000 RSI: 00007fff7d820fa0 RDI: 0000000000000005 [ 560.879640][T17451] RBP: 00007fff7d820ef0 R08: 0000000000000000 R09: 0000000000000000 [ 560.879641][T17451] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 560.879642][T17451] R13: 0000000069a48251 R14: 00007fff7d821aa8 R15: 000000000049b620 [ 560.879648][T17451]