[ 786.814973][T12621] [ 786.815227][T12621] ============================= [ 786.815545][T12621] WARNING: suspicious RCU usage [ 786.815709][T12621] 7.2.0-rc1-virtme #1 Not tainted [ 786.815871][T12621] ----------------------------- [ 786.816026][T12621] drivers/net/vxlan/vxlan_core.c:1872 suspicious rcu_dereference_check() usage! [ 786.816422][T12621] [ 786.816422][T12621] other info that might help us debug this: [ 786.816422][T12621] [ 786.816685][T12621] [ 786.816685][T12621] rcu_scheduler_active = 2, debug_locks = 1 [ 786.816900][T12621] 1 lock held by arping/12621: [ 786.817069][T12621] #0: ffffffff8c791e60 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x206/0x1b70 [ 786.817328][T12621] [ 786.817328][T12621] stack backtrace: [ 786.817526][T12621] CPU: 2 UID: 0 PID: 12621 Comm: arping Not tainted 7.2.0-rc1-virtme #1 PREEMPT(full) [ 786.817529][T12621] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 786.817531][T12621] Call Trace: [ 786.817533][T12621] [ 786.817535][T12621] dump_stack_lvl+0x6f/0xa0 [ 786.817542][T12621] lockdep_rcu_suspicious.cold+0x37/0x89 [ 786.817548][T12621] arp_reduce.isra.0+0x9b9/0x1080 [vxlan] [ 786.817556][T12621] ? mark_usage+0x61/0x170 [ 786.817560][T12621] ? __lock_acquire+0x518/0xc20 [ 786.817564][T12621] ? vxlan_nl2conf+0x5b30/0x5b30 [vxlan] [ 786.817569][T12621] ? lock_acquire.part.0+0xbc/0x260 [ 786.817571][T12621] ? find_held_lock+0x2b/0x80 [ 786.817574][T12621] ? __lock_release.isra.0+0x6b/0x1a0 [ 786.817578][T12621] ? vxlan_xmit+0x128b/0x1660 [vxlan] [ 786.817582][T12621] vxlan_xmit+0x128b/0x1660 [vxlan] [ 786.817587][T12621] ? rcu_lockdep_current_cpu_online+0x39/0x1b0 [ 786.817592][T12621] dev_hard_start_xmit+0xf4/0x620 [ 786.817595][T12621] ? validate_xmit_skb+0x72/0x9a0 [ 786.817598][T12621] __dev_queue_xmit+0xc04/0x1b70 [ 786.817600][T12621] ? _copy_from_iter+0x1bb/0x1810 [ 786.817604][T12621] ? __alloc_skb+0x342/0x5f0 [ 786.817608][T12621] ? _copy_from_iter_flushcache+0x1970/0x1970 [ 786.817610][T12621] ? ref_tracker_alloc+0x2e7/0x430 [ 786.817613][T12621] ? netdev_core_pick_tx+0x2c0/0x2c0 [ 786.817617][T12621] ? packet_parse_headers+0x325/0x830 [ 786.817620][T12621] ? __asan_memset+0x27/0x50 [ 786.817623][T12621] ? packet_parse_headers+0x325/0x830 [ 786.817626][T12621] ? skb_copy_datagram_from_iter+0xf3/0x6a0 [ 786.817628][T12621] ? packet_release+0xc70/0xc70 [ 786.817632][T12621] packet_snd+0xfad/0x1990 [ 786.817638][T12621] ? tpacket_snd+0x19e0/0x19e0 [ 786.817639][T12621] ? __might_fault+0x97/0x140 [ 786.817645][T12621] ? __might_fault+0x97/0x140 [ 786.817647][T12621] ? __might_fault+0x97/0x140 [ 786.817651][T12621] __sys_sendto+0x2aa/0x400 [ 786.817654][T12621] ? __ia32_sys_getpeername+0xd0/0xd0 [ 786.817662][T12621] ? do_user_addr_fault+0x325/0xe30 [ 786.817668][T12621] __x64_sys_sendto+0xe4/0x1f0 [ 786.817669][T12621] ? trace_irq_enable.constprop.0+0x9b/0x160 [ 786.817673][T12621] ? lockdep_hardirqs_on+0x8c/0x130 [ 786.817676][T12621] ? do_syscall_64+0x82/0x590 [ 786.817678][T12621] do_syscall_64+0x117/0x590 [ 786.817680][T12621] ? trace_hardirqs_off+0xd/0x30 [ 786.817682][T12621] ? exc_page_fault+0xee/0x100 [ 786.817685][T12621] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 786.817687][T12621] RIP: 0033:0x7f847ed9254e [ 786.817690][T12621] Code: 4d 89 d8 e8 b4 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 03 ff ff ff 0f 1f 00 f3 0f 1e fa [ 786.817692][T12621] RSP: 002b:00007ffccb1d6050 EFLAGS: 00000202 ORIG_RAX: 000000000000002c [ 786.817695][T12621] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f847ed9254e [ 786.817697][T12621] RDX: 000000000000001c RSI: 00007ffccb1d60d0 RDI: 0000000000000005 [ 786.817698][T12621] RBP: 00007ffccb1d6060 R08: 00007ffccb1d6550 R09: 0000000000000014 [ 786.817698][T12621] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 786.817699][T12621] R13: 00007ffccb1d6480 R14: ffffffffffffffe8 R15: 0000000000000000 [ 786.817705][T12621]