[ 15.707821][ T369] [ 15.708137][ T369] ============================= [ 15.708307][ T369] WARNING: suspicious RCU usage [ 15.708466][ T369] 6.14.0-rc6-virtme #1 Not tainted [ 15.708627][ T369] ----------------------------- [ 15.708783][ T369] ./include/net/net_namespace.h:418 suspicious rcu_dereference_check() usage! [ 15.709079][ T369] [ 15.709079][ T369] other info that might help us debug this: [ 15.709079][ T369] [ 15.709382][ T369] [ 15.709382][ T369] rcu_scheduler_active = 2, debug_locks = 1 [ 15.709612][ T369] 2 locks held by tun/369: [ 15.709773][ T369] #0: ffffffffb836f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x1f5/0x18d0 [ 15.710077][ T369] #1: ffff88800c832258 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb+0x952/0x10a0 [ 15.710436][ T369] [ 15.710436][ T369] stack backtrace: [ 15.710632][ T369] CPU: 0 UID: 0 PID: 369 Comm: tun Not tainted 6.14.0-rc6-virtme #1 [ 15.710635][ T369] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 15.710638][ T369] Call Trace: [ 15.710640][ T369] [ 15.710642][ T369] dump_stack_lvl+0xb0/0xd0 [ 15.710650][ T369] lockdep_rcu_suspicious+0x1ea/0x280 [ 15.710661][ T369] dev_hard_start_xmit+0x2fc/0x3f0 [ 15.710673][ T369] sch_direct_xmit+0x212/0x11d0 [ 15.710680][ T369] ? tun_select_queue+0xf2/0x8e0 [ 15.710685][ T369] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 15.710690][ T369] ? __pfx_sch_direct_xmit+0x10/0x10 [ 15.710694][ T369] ? do_raw_spin_trylock+0xb9/0x190 [ 15.710700][ T369] ? lock_acquire+0x32/0xc0 [ 15.710703][ T369] ? __dev_xmit_skb+0x952/0x10a0 [ 15.710713][ T369] __dev_xmit_skb+0xaec/0x10a0 [ 15.710717][ T369] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 15.710723][ T369] ? __pfx___dev_xmit_skb+0x10/0x10 [ 15.710731][ T369] ? netdev_core_pick_tx+0x115/0x300 [ 15.710740][ T369] __dev_queue_xmit+0x788/0x18d0 [ 15.710752][ T369] ? sock_alloc_send_pskb+0x678/0x7f0 [ 15.710761][ T369] ? __pfx___dev_queue_xmit+0x10/0x10 [ 15.710766][ T369] ? packet_parse_headers+0x243/0x9d0 [ 15.710776][ T369] ? __pfx_sock_alloc_send_pskb+0x10/0x10 [ 15.710781][ T369] ? __pfx_packet_parse_headers+0x10/0x10 [ 15.710789][ T369] ? dev_get_by_index+0xb2/0x190 [ 15.710800][ T369] packet_snd+0xd0d/0x19c0 [ 15.710813][ T369] ? __lock_release+0x103/0x460 [ 15.710815][ T369] ? __might_fault+0x11b/0x170 [ 15.710822][ T369] ? __pfx_packet_snd+0x10/0x10 [ 15.710824][ T369] ? trace_lock_acquire+0x14c/0x1f0 [ 15.710832][ T369] ? lock_acquire+0x32/0xc0 [ 15.710838][ T369] ? __might_fault+0x11b/0x170 [ 15.710850][ T369] __sys_sendto+0x3c3/0x450 [ 15.710857][ T369] ? __pfx___sys_sendto+0x10/0x10 [ 15.710861][ T369] ? __might_fault+0x11b/0x170 [ 15.710882][ T369] ? __rseq_handle_notify_resume+0x288/0x3e0 [ 15.710895][ T369] ? __x64_sys_openat+0x123/0x1e0 [ 15.710903][ T369] ? __pfx___x64_sys_openat+0x10/0x10 [ 15.710905][ T369] ? __pfx_ksys_write+0x10/0x10 [ 15.710915][ T369] __x64_sys_sendto+0xe0/0x1c0 [ 15.710919][ T369] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 15.710924][ T369] do_syscall_64+0xc1/0x1d0 [ 15.710932][ T369] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 15.710937][ T369] RIP: 0033:0x7fd484225a4a [ 15.710941][ T369] Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 f3 0f 1e fa 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 15 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 7e c3 0f 1f 44 00 00 41 54 48 83 ec 30 44 89 [ 15.710944][ T369] RSP: 002b:00007fffe1727718 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 15.710947][ T369] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd484225a4a [ 15.710949][ T369] RDX: 0000000000000000 RSI: 00007fffe17277a4 RDI: 0000000000000006 [ 15.710951][ T369] RBP: 0000000000000022 R08: 00007fffe1727770 R09: 0000000000000014 [ 15.710953][ T369] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 15.710955][ T369] R13: 000000000040a360 R14: 00007fd4840cb000 R15: 00007fd4840cb000 [ 15.710973][ T369]