[ 133.403226][ T1055] [ 133.403543][ T1055] ============================= [ 133.403709][ T1055] WARNING: suspicious RCU usage [ 133.403872][ T1055] 6.14.0-rc6-virtme #1 Not tainted [ 133.404047][ T1055] ----------------------------- [ 133.404208][ T1055] ./include/net/net_namespace.h:418 suspicious rcu_dereference_check() usage! [ 133.404478][ T1055] [ 133.404478][ T1055] other info that might help us debug this: [ 133.404478][ T1055] [ 133.404782][ T1055] [ 133.404782][ T1055] rcu_scheduler_active = 2, debug_locks = 1 [ 133.405022][ T1055] 2 locks held by tun/1055: [ 133.405189][ T1055] #0: ffffffff95b6f640 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit+0x1f5/0x18d0 [ 133.405509][ T1055] #1: ffff888014daba58 (dev->qdisc_tx_busylock ?: &qdisc_tx_busylock){+...}-{3:3}, at: __dev_xmit_skb+0x952/0x10a0 [ 133.405872][ T1055] [ 133.405872][ T1055] stack backtrace: [ 133.406077][ T1055] CPU: 0 UID: 0 PID: 1055 Comm: tun Not tainted 6.14.0-rc6-virtme #1 [ 133.406081][ T1055] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 133.406083][ T1055] Call Trace: [ 133.406085][ T1055] [ 133.406087][ T1055] dump_stack_lvl+0xb0/0xd0 [ 133.406095][ T1055] lockdep_rcu_suspicious+0x1ea/0x280 [ 133.406106][ T1055] dev_hard_start_xmit+0x2fc/0x3f0 [ 133.406118][ T1055] sch_direct_xmit+0x212/0x11d0 [ 133.406124][ T1055] ? tun_select_queue+0xf2/0x8e0 [ 133.406130][ T1055] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 133.406135][ T1055] ? __pfx_sch_direct_xmit+0x10/0x10 [ 133.406139][ T1055] ? do_raw_spin_trylock+0xb9/0x190 [ 133.406146][ T1055] ? lock_acquire+0x32/0xc0 [ 133.406148][ T1055] ? __dev_xmit_skb+0x952/0x10a0 [ 133.406159][ T1055] __dev_xmit_skb+0xaec/0x10a0 [ 133.406163][ T1055] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 133.406169][ T1055] ? __pfx___dev_xmit_skb+0x10/0x10 [ 133.406177][ T1055] ? netdev_core_pick_tx+0x115/0x300 [ 133.406186][ T1055] __dev_queue_xmit+0x788/0x18d0 [ 133.406198][ T1055] ? sock_alloc_send_pskb+0x678/0x7f0 [ 133.406206][ T1055] ? __pfx___dev_queue_xmit+0x10/0x10 [ 133.406211][ T1055] ? packet_parse_headers+0x243/0x9d0 [ 133.406221][ T1055] ? __pfx_sock_alloc_send_pskb+0x10/0x10 [ 133.406227][ T1055] ? __pfx_packet_parse_headers+0x10/0x10 [ 133.406235][ T1055] ? dev_get_by_index+0xb2/0x190 [ 133.406245][ T1055] packet_snd+0xd0d/0x19c0 [ 133.406258][ T1055] ? __lock_release+0x103/0x460 [ 133.406260][ T1055] ? __might_fault+0x11b/0x170 [ 133.406267][ T1055] ? __pfx_packet_snd+0x10/0x10 [ 133.406270][ T1055] ? trace_lock_acquire+0x14c/0x1f0 [ 133.406278][ T1055] ? lock_acquire+0x32/0xc0 [ 133.406284][ T1055] ? __might_fault+0x11b/0x170 [ 133.406295][ T1055] __sys_sendto+0x3c3/0x450 [ 133.406302][ T1055] ? __pfx___sys_sendto+0x10/0x10 [ 133.406307][ T1055] ? __might_fault+0x11b/0x170 [ 133.406327][ T1055] ? fd_install+0x1d6/0x5a0 [ 133.406336][ T1055] ? __x64_sys_openat+0x123/0x1e0 [ 133.406343][ T1055] ? __pfx___x64_sys_openat+0x10/0x10 [ 133.406346][ T1055] ? __pfx_ksys_write+0x10/0x10 [ 133.406355][ T1055] __x64_sys_sendto+0xe0/0x1c0 [ 133.406360][ T1055] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 133.406364][ T1055] do_syscall_64+0xc1/0x1d0 [ 133.406371][ T1055] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 133.406376][ T1055] RIP: 0033:0x7f6dcb72da4a [ 133.406380][ T1055] 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 [ 133.406383][ T1055] RSP: 002b:00007ffe1137ac18 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 133.406386][ T1055] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f6dcb72da4a [ 133.406388][ T1055] RDX: 0000000000000000 RSI: 00007ffe1137aca4 RDI: 0000000000000006 [ 133.406390][ T1055] RBP: 0000000000000022 R08: 00007ffe1137ac70 R09: 0000000000000014 [ 133.406391][ T1055] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 133.406393][ T1055] R13: 000000000040a360 R14: 00007f6dcb5d3000 R15: 00007f6dcb5d3000 [ 133.406411][ T1055]