[ 49.687100][ T973] ip_gre: GRE over IPv4 tunneling driver [ 49.796894][ T982] ip (982) used greatest stack depth: 24384 bytes left [ 58.678877][ T1107] [ 58.679130][ T1107] ============================= [ 58.679308][ T1107] WARNING: suspicious RCU usage [ 58.679478][ T1107] 7.0.0-rc3-virtme #1 Not tainted [ 58.679647][ T1107] ----------------------------- [ 58.679833][ T1107] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 58.680061][ T1107] [ 58.680061][ T1107] other info that might help us debug this: [ 58.680061][ T1107] [ 58.680371][ T1107] [ 58.680371][ T1107] rcu_scheduler_active = 2, debug_locks = 1 [ 58.680601][ T1107] 1 lock held by ip/1107: [ 58.680748][ T1107] #0: ffffffff8e87f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 58.681024][ T1107] [ 58.681024][ T1107] stack backtrace: [ 58.681236][ T1107] CPU: 2 UID: 0 PID: 1107 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 58.681240][ T1107] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 58.681242][ T1107] Call Trace: [ 58.681244][ T1107] [ 58.681246][ T1107] dump_stack_lvl+0x6f/0xa0 [ 58.681253][ T1107] lockdep_rcu_suspicious.cold+0x4f/0xad [ 58.681258][ T1107] fib6_update_sernum+0xfb/0x130 [ 58.681262][ T1107] nh_rt_cache_flush+0x8d/0x380 [ 58.681267][ T1107] replace_nexthop+0x347/0x6e0 [ 58.681271][ T1107] insert_nexthop+0x41e/0x7a0 [ 58.681275][ T1107] rtm_new_nexthop+0x3a0/0x8c0 [ 58.681278][ T1107] ? insert_nexthop+0x7a0/0x7a0 [ 58.681280][ T1107] ? lock_acquire.part.0+0xbc/0x260 [ 58.681283][ T1107] ? find_held_lock+0x2b/0x80 [ 58.681289][ T1107] ? lock_acquire.part.0+0xbc/0x260 [ 58.681290][ T1107] ? find_held_lock+0x2b/0x80 [ 58.681295][ T1107] ? find_held_lock+0x2b/0x80 [ 58.681297][ T1107] ? insert_nexthop+0x7a0/0x7a0 [ 58.681299][ T1107] ? __lock_release.isra.0+0x59/0x170 [ 58.681302][ T1107] ? insert_nexthop+0x7a0/0x7a0 [ 58.681304][ T1107] rtnetlink_rcv_msg+0x6fe/0xb90 [ 58.681309][ T1107] ? rtnl_fdb_dump+0x620/0x620 [ 58.681312][ T1107] ? __lock_acquire+0x577/0xc10 [ 58.681316][ T1107] ? lock_acquire.part.0+0xbc/0x260 [ 58.681317][ T1107] ? find_held_lock+0x2b/0x80 [ 58.681320][ T1107] netlink_rcv_skb+0x123/0x380 [ 58.681324][ T1107] ? rtnl_fdb_dump+0x620/0x620 [ 58.681327][ T1107] ? netlink_ack+0xce0/0xce0 [ 58.681333][ T1107] ? netlink_deliver_tap+0xc5/0x330 [ 58.681335][ T1107] ? netlink_deliver_tap+0x13f/0x330 [ 58.681339][ T1107] netlink_unicast+0x4a3/0x770 [ 58.681343][ T1107] ? netlink_attachskb+0x810/0x810 [ 58.681345][ T1107] ? __alloc_skb+0x4c4/0x5f0 [ 58.681348][ T1107] ? napi_skb_cache_get+0x7a0/0x7a0 [ 58.681351][ T1107] ? __lock_acquire+0x577/0xc10 [ 58.681355][ T1107] netlink_sendmsg+0x735/0xc60 [ 58.681358][ T1107] ? netlink_unicast+0x770/0x770 [ 58.681362][ T1107] ? __might_fault+0x97/0x140 [ 58.681368][ T1107] ____sys_sendmsg+0x419/0x850 [ 58.681371][ T1107] ? copy_msghdr_from_user+0x270/0x430 [ 58.681373][ T1107] ? get_timestamp.constprop.0+0x390/0x390 [ 58.681374][ T1107] ? move_addr_to_kernel+0x40/0x40 [ 58.681378][ T1107] ? lock_acquire.part.0+0xbc/0x260 [ 58.681380][ T1107] ? find_held_lock+0x2b/0x80 [ 58.681382][ T1107] ___sys_sendmsg+0xfd/0x180 [ 58.681385][ T1107] ? copy_msghdr_from_user+0x430/0x430 [ 58.681386][ T1107] ? __lock_release.isra.0+0x59/0x170 [ 58.681397][ T1107] ? lock_vma_under_rcu+0x128/0x3e0 [ 58.681401][ T1107] __sys_sendmsg+0x124/0x1c0 [ 58.681404][ T1107] ? __sys_sendmsg_sock+0x20/0x20 [ 58.681409][ T1107] ? do_user_addr_fault+0x799/0xdb0 [ 58.681413][ T1107] ? rcu_is_watching+0x15/0xd0 [ 58.681417][ T1107] ? rcu_is_watching+0x15/0xd0 [ 58.681420][ T1107] do_syscall_64+0x117/0xfc0 [ 58.681424][ T1107] ? exc_page_fault+0xaf/0xd0 [ 58.681427][ T1107] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 58.681429][ T1107] RIP: 0033:0x7ffac4737c5e [ 58.681433][ T1107] 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 [ 58.681435][ T1107] RSP: 002b:00007ffdc30dfe10 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 58.681438][ T1107] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007ffac4737c5e [ 58.681440][ T1107] RDX: 0000000000000000 RSI: 00007ffdc30dfed0 RDI: 0000000000000005 [ 58.681441][ T1107] RBP: 00007ffdc30dfe20 R08: 0000000000000000 R09: 0000000000000000 [ 58.681441][ T1107] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 58.681442][ T1107] R13: 0000000069b99de1 R14: 000000001d586310 R15: 000000000049c620 [ 58.681448][ T1107]