[ 9.183036][ T185] ip (185) used greatest stack depth: 23976 bytes left [ 9.619038][ T198] ip (198) used greatest stack depth: 23888 bytes left [ 19.468196][ T361] [ 19.468408][ T361] ============================= [ 19.468553][ T361] WARNING: suspicious RCU usage [ 19.468683][ T361] 7.0.0-rc3-virtme #1 Not tainted [ 19.468814][ T361] ----------------------------- [ 19.468969][ T361] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 19.469279][ T361] [ 19.469279][ T361] other info that might help us debug this: [ 19.469279][ T361] [ 19.469550][ T361] [ 19.469550][ T361] rcu_scheduler_active = 2, debug_locks = 1 [ 19.469744][ T361] 1 lock held by ip/361: [ 19.469844][ T361] #0: ffffffffa147f228 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 19.470081][ T361] [ 19.470081][ T361] stack backtrace: [ 19.470250][ T361] CPU: 0 UID: 0 PID: 361 Comm: ip Not tainted 7.0.0-rc3-virtme #1 PREEMPT(full) [ 19.470253][ T361] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.470255][ T361] Call Trace: [ 19.470256][ T361] [ 19.470258][ T361] dump_stack_lvl+0x6f/0xa0 [ 19.470264][ T361] lockdep_rcu_suspicious.cold+0x4f/0xad [ 19.470270][ T361] fib6_update_sernum+0xfb/0x130 [ 19.470274][ T361] nh_rt_cache_flush+0x8d/0x380 [ 19.470279][ T361] replace_nexthop+0x347/0x6e0 [ 19.470283][ T361] insert_nexthop+0x41e/0x7a0 [ 19.470287][ T361] rtm_new_nexthop+0x3a0/0x8c0 [ 19.470291][ T361] ? insert_nexthop+0x7a0/0x7a0 [ 19.470292][ T361] ? lock_acquire.part.0+0xbc/0x260 [ 19.470296][ T361] ? find_held_lock+0x2b/0x80 [ 19.470302][ T361] ? lock_acquire.part.0+0xbc/0x260 [ 19.470303][ T361] ? find_held_lock+0x2b/0x80 [ 19.470309][ T361] ? find_held_lock+0x2b/0x80 [ 19.470310][ T361] ? insert_nexthop+0x7a0/0x7a0 [ 19.470312][ T361] ? __lock_release.isra.0+0x59/0x170 [ 19.470316][ T361] ? insert_nexthop+0x7a0/0x7a0 [ 19.470318][ T361] rtnetlink_rcv_msg+0x6fe/0xb90 [ 19.470323][ T361] ? rtnl_fdb_dump+0x620/0x620 [ 19.470325][ T361] ? __lock_acquire+0x577/0xc10 [ 19.470329][ T361] ? lock_acquire.part.0+0xbc/0x260 [ 19.470331][ T361] ? find_held_lock+0x2b/0x80 [ 19.470334][ T361] netlink_rcv_skb+0x123/0x380 [ 19.470338][ T361] ? rtnl_fdb_dump+0x620/0x620 [ 19.470341][ T361] ? netlink_ack+0xce0/0xce0 [ 19.470348][ T361] ? netlink_deliver_tap+0xc5/0x330 [ 19.470350][ T361] ? netlink_deliver_tap+0x13f/0x330 [ 19.470354][ T361] netlink_unicast+0x4a3/0x770 [ 19.470358][ T361] ? netlink_attachskb+0x810/0x810 [ 19.470361][ T361] ? __alloc_skb+0x4c4/0x5f0 [ 19.470364][ T361] ? napi_skb_cache_get+0x7a0/0x7a0 [ 19.470367][ T361] ? __lock_acquire+0x577/0xc10 [ 19.470370][ T361] netlink_sendmsg+0x735/0xc60 [ 19.470374][ T361] ? netlink_unicast+0x770/0x770 [ 19.470378][ T361] ? __might_fault+0x97/0x140 [ 19.470384][ T361] ____sys_sendmsg+0x419/0x850 [ 19.470387][ T361] ? copy_msghdr_from_user+0x270/0x430 [ 19.470389][ T361] ? get_timestamp.constprop.0+0x390/0x390 [ 19.470391][ T361] ? move_addr_to_kernel+0x40/0x40 [ 19.470395][ T361] ? lock_acquire.part.0+0xbc/0x260 [ 19.470402][ T361] ? find_held_lock+0x2b/0x80 [ 19.470405][ T361] ___sys_sendmsg+0xfd/0x180 [ 19.470408][ T361] ? copy_msghdr_from_user+0x430/0x430 [ 19.470409][ T361] ? __lock_release.isra.0+0x59/0x170 [ 19.470420][ T361] ? lock_vma_under_rcu+0x128/0x3e0 [ 19.470425][ T361] __sys_sendmsg+0x124/0x1c0 [ 19.470428][ T361] ? __sys_sendmsg_sock+0x20/0x20 [ 19.470433][ T361] ? do_user_addr_fault+0x799/0xdb0 [ 19.470438][ T361] ? rcu_is_watching+0x15/0xd0 [ 19.470441][ T361] ? rcu_is_watching+0x15/0xd0 [ 19.470445][ T361] do_syscall_64+0x117/0xfc0 [ 19.470449][ T361] ? exc_page_fault+0xaf/0xd0 [ 19.470452][ T361] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 19.470454][ T361] RIP: 0033:0x7f439a4c9c5e [ 19.470458][ T361] 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 [ 19.470460][ T361] RSP: 002b:00007fff59936cb0 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 19.470463][ T361] RAX: ffffffffffffffda RBX: 000000000048a950 RCX: 00007f439a4c9c5e [ 19.470464][ T361] RDX: 0000000000000000 RSI: 00007fff59936d70 RDI: 0000000000000005 [ 19.470465][ T361] RBP: 00007fff59936cc0 R08: 0000000000000000 R09: 0000000000000000 [ 19.470466][ T361] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 19.470466][ T361] R13: 0000000069b99b60 R14: 00007fff59937878 R15: 000000000049c620 [ 19.470473][ T361]