[ 838.038654][T12218] [ 838.038770][T12218] ============================= [ 838.038905][T12218] WARNING: suspicious RCU usage [ 838.039030][T12218] 7.0.0-rc1-virtme #1 Not tainted [ 838.039155][T12218] ----------------------------- [ 838.039283][T12218] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 838.039468][T12218] [ 838.039468][T12218] other info that might help us debug this: [ 838.039468][T12218] [ 838.040144][T12218] [ 838.040144][T12218] rcu_scheduler_active = 2, debug_locks = 1 [ 838.040337][T12218] 1 lock held by ip/12218: [ 838.040464][T12218] #0: ffffffffa087e6e8 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 838.040721][T12218] [ 838.040721][T12218] stack backtrace: [ 838.040895][T12218] CPU: 3 UID: 0 PID: 12218 Comm: ip Not tainted 7.0.0-rc1-virtme #1 PREEMPT(full) [ 838.040898][T12218] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 838.040899][T12218] Call Trace: [ 838.040901][T12218] [ 838.040902][T12218] dump_stack_lvl+0x6f/0xa0 [ 838.040909][T12218] lockdep_rcu_suspicious.cold+0x4f/0xad [ 838.040915][T12218] fib6_update_sernum+0xfb/0x130 [ 838.040919][T12218] nh_rt_cache_flush+0x8d/0x380 [ 838.040924][T12218] replace_nexthop+0x347/0x6e0 [ 838.040929][T12218] insert_nexthop+0x41e/0x7a0 [ 838.040934][T12218] rtm_new_nexthop+0x3a0/0x8c0 [ 838.040937][T12218] ? insert_nexthop+0x7a0/0x7a0 [ 838.040939][T12218] ? lock_acquire.part.0+0xbc/0x260 [ 838.040942][T12218] ? find_held_lock+0x2b/0x80 [ 838.040949][T12218] ? lock_acquire.part.0+0xbc/0x260 [ 838.040950][T12218] ? find_held_lock+0x2b/0x80 [ 838.040956][T12218] ? find_held_lock+0x2b/0x80 [ 838.040957][T12218] ? insert_nexthop+0x7a0/0x7a0 [ 838.040959][T12218] ? __lock_release.isra.0+0x59/0x170 [ 838.040963][T12218] ? insert_nexthop+0x7a0/0x7a0 [ 838.040965][T12218] rtnetlink_rcv_msg+0x6fe/0xb90 [ 838.040970][T12218] ? rtnl_fdb_dump+0x620/0x620 [ 838.040973][T12218] ? __lock_acquire+0x577/0xc10 [ 838.040977][T12218] ? lock_acquire.part.0+0xbc/0x260 [ 838.040978][T12218] ? find_held_lock+0x2b/0x80 [ 838.040981][T12218] netlink_rcv_skb+0x123/0x380 [ 838.040985][T12218] ? rtnl_fdb_dump+0x620/0x620 [ 838.040988][T12218] ? netlink_ack+0xcc0/0xcc0 [ 838.040994][T12218] ? netlink_deliver_tap+0xc5/0x330 [ 838.040996][T12218] ? netlink_deliver_tap+0x13f/0x330 [ 838.041001][T12218] netlink_unicast+0x4a3/0x770 [ 838.041005][T12218] ? netlink_attachskb+0x810/0x810 [ 838.041007][T12218] ? __alloc_skb+0x4cd/0x600 [ 838.041010][T12218] ? napi_skb_cache_get+0x7a0/0x7a0 [ 838.041013][T12218] ? __lock_acquire+0x577/0xc10 [ 838.041016][T12218] netlink_sendmsg+0x735/0xc60 [ 838.041020][T12218] ? netlink_unicast+0x770/0x770 [ 838.041024][T12218] ? __might_fault+0x97/0x140 [ 838.041030][T12218] ____sys_sendmsg+0x419/0x850 [ 838.041033][T12218] ? copy_msghdr_from_user+0x270/0x430 [ 838.041034][T12218] ? get_timestamp.constprop.0+0x3a0/0x3a0 [ 838.041036][T12218] ? move_addr_to_kernel+0x40/0x40 [ 838.041040][T12218] ? lock_acquire.part.0+0xbc/0x260 [ 838.041042][T12218] ? find_held_lock+0x2b/0x80 [ 838.041045][T12218] ___sys_sendmsg+0xfd/0x180 [ 838.041047][T12218] ? copy_msghdr_from_user+0x430/0x430 [ 838.041048][T12218] ? __lock_release.isra.0+0x59/0x170 [ 838.041060][T12218] ? lock_vma_under_rcu+0x128/0x3e0 [ 838.041065][T12218] __sys_sendmsg+0x124/0x1c0 [ 838.041068][T12218] ? __sys_sendmsg_sock+0x20/0x20 [ 838.041074][T12218] ? do_user_addr_fault+0x799/0xdb0 [ 838.041078][T12218] ? rcu_is_watching+0x15/0xd0 [ 838.041082][T12218] ? rcu_is_watching+0x15/0xd0 [ 838.041085][T12218] do_syscall_64+0x117/0xfc0 [ 838.041090][T12218] ? exc_page_fault+0xaf/0xd0 [ 838.041093][T12218] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 838.041095][T12218] RIP: 0033:0x7f861e910c5e [ 838.041099][T12218] 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 [ 838.041101][T12218] RSP: 002b:00007fff4d986f50 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 838.041104][T12218] RAX: ffffffffffffffda RBX: 000000000048a910 RCX: 00007f861e910c5e [ 838.041106][T12218] RDX: 0000000000000000 RSI: 00007fff4d987010 RDI: 0000000000000005 [ 838.041107][T12218] RBP: 00007fff4d986f60 R08: 0000000000000000 R09: 0000000000000000 [ 838.041108][T12218] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 838.041108][T12218] R13: 0000000069a48519 R14: 00007fff4d987b08 R15: 000000000049b620 [ 838.041115][T12218]