[ 10.377112][ T268] [ 10.377409][ T268] ============================= [ 10.377582][ T268] WARNING: suspicious RCU usage [ 10.377770][ T268] 6.14.0-rc6-virtme #1 Not tainted [ 10.377944][ T268] ----------------------------- [ 10.378113][ T268] ./include/net/net_namespace.h:418 suspicious rcu_dereference_check() usage! [ 10.378430][ T268] [ 10.378430][ T268] other info that might help us debug this: [ 10.378430][ T268] [ 10.378771][ T268] [ 10.378771][ T268] rcu_scheduler_active = 2, debug_locks = 1 [ 10.379030][ T268] 2 locks held by tun/268: [ 10.379202][ T268] #0: ffffffff9d96f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x1f5/0x18d0 [ 10.379529][ T268] #1: ffff888006538a58 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb+0x952/0x10a0 [ 10.379925][ T268] [ 10.379925][ T268] stack backtrace: [ 10.380135][ T268] CPU: 1 UID: 0 PID: 268 Comm: tun Not tainted 6.14.0-rc6-virtme #1 [ 10.380139][ T268] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 10.380141][ T268] Call Trace: [ 10.380142][ T268] [ 10.380145][ T268] dump_stack_lvl+0xb0/0xd0 [ 10.380153][ T268] lockdep_rcu_suspicious+0x1ea/0x280 [ 10.380164][ T268] dev_hard_start_xmit+0x2fc/0x3f0 [ 10.380175][ T268] sch_direct_xmit+0x212/0x11d0 [ 10.380182][ T268] ? tun_select_queue+0xf2/0x8e0 [ 10.380187][ T268] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.380193][ T268] ? __pfx_sch_direct_xmit+0x10/0x10 [ 10.380196][ T268] ? do_raw_spin_trylock+0xb9/0x190 [ 10.380203][ T268] ? lock_acquire+0x32/0xc0 [ 10.380205][ T268] ? __dev_xmit_skb+0x952/0x10a0 [ 10.380215][ T268] __dev_xmit_skb+0xaec/0x10a0 [ 10.380220][ T268] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 10.380226][ T268] ? __pfx___dev_xmit_skb+0x10/0x10 [ 10.380234][ T268] ? netdev_core_pick_tx+0x115/0x300 [ 10.380242][ T268] __dev_queue_xmit+0x788/0x18d0 [ 10.380255][ T268] ? sock_alloc_send_pskb+0x678/0x7f0 [ 10.380263][ T268] ? __pfx___dev_queue_xmit+0x10/0x10 [ 10.380268][ T268] ? packet_parse_headers+0x243/0x9d0 [ 10.380278][ T268] ? __pfx_sock_alloc_send_pskb+0x10/0x10 [ 10.380284][ T268] ? __pfx_packet_parse_headers+0x10/0x10 [ 10.380291][ T268] ? dev_get_by_index+0xb2/0x190 [ 10.380302][ T268] packet_snd+0xd0d/0x19c0 [ 10.380315][ T268] ? __lock_release+0x103/0x460 [ 10.380317][ T268] ? __might_fault+0x11b/0x170 [ 10.380324][ T268] ? __pfx_packet_snd+0x10/0x10 [ 10.380326][ T268] ? trace_lock_acquire+0x14c/0x1f0 [ 10.380334][ T268] ? lock_acquire+0x32/0xc0 [ 10.380340][ T268] ? __might_fault+0x11b/0x170 [ 10.380352][ T268] __sys_sendto+0x3c3/0x450 [ 10.380359][ T268] ? __pfx___sys_sendto+0x10/0x10 [ 10.380363][ T268] ? __might_fault+0x11b/0x170 [ 10.380384][ T268] ? fd_install+0x1d6/0x5a0 [ 10.380393][ T268] ? __x64_sys_openat+0x123/0x1e0 [ 10.380401][ T268] ? __pfx___x64_sys_openat+0x10/0x10 [ 10.380403][ T268] ? __pfx_ksys_write+0x10/0x10 [ 10.380413][ T268] __x64_sys_sendto+0xe0/0x1c0 [ 10.380417][ T268] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 10.380422][ T268] do_syscall_64+0xc1/0x1d0 [ 10.380429][ T268] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 10.380433][ T268] RIP: 0033:0x7f80837b7a4a [ 10.380438][ T268] 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 [ 10.380440][ T268] RSP: 002b:00007ffcde296e38 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 10.380444][ T268] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f80837b7a4a [ 10.380446][ T268] RDX: 0000000000000000 RSI: 00007ffcde296ec4 RDI: 0000000000000006 [ 10.380448][ T268] RBP: 0000000000000022 R08: 00007ffcde296e90 R09: 0000000000000014 [ 10.380450][ T268] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 10.380451][ T268] R13: 000000000040a360 R14: 00007f808365d000 R15: 00007f808365d000 [ 10.380469][ T268]