[ 1476.624396][ T7598] netdevsim netdevsim381 eni381np1: renamed from eth0 [ 1476.695496][ T7599] netdevsim netdevsim542 eni542np1: renamed from eth1 [ 1484.195321][ T7658] [ 1484.195456][ T7658] ====================================================== [ 1484.195703][ T7658] WARNING: possible circular locking dependency detected [ 1484.195941][ T7658] 6.12.0-rc5-virtme #1 Not tainted [ 1484.196129][ T7658] ------------------------------------------------------ [ 1484.196365][ T7658] modprobe/7658 is trying to acquire lock: [ 1484.196601][ T7658] ffffffffc08ea700 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 1484.196874][ T7658] [ 1484.196874][ T7658] but task is already holding lock: [ 1484.197077][ T7658] ffffffffb9df7d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 1484.197329][ T7658] [ 1484.197329][ T7658] which lock already depends on the new lock. [ 1484.197329][ T7658] [ 1484.197596][ T7658] [ 1484.197596][ T7658] the existing dependency chain (in reverse order) is: [ 1484.197832][ T7658] [ 1484.197832][ T7658] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 1484.198035][ T7658] __lock_acquire+0xb3f/0x1580 [ 1484.198178][ T7658] lock_acquire.part.0+0xeb/0x330 [ 1484.198317][ T7658] __mutex_lock+0x149/0xac0 [ 1484.198471][ T7658] rtnl_newlink+0x64b/0xa30 [ 1484.198611][ T7658] rtnetlink_rcv_msg+0x712/0xc10 [ 1484.198750][ T7658] netlink_rcv_skb+0x130/0x360 [ 1484.198887][ T7658] netlink_unicast+0x44b/0x710 [ 1484.199018][ T7658] netlink_sendmsg+0x723/0xbe0 [ 1484.199151][ T7658] ____sys_sendmsg+0x7ac/0xa10 [ 1484.199284][ T7658] ___sys_sendmsg+0xee/0x170 [ 1484.199420][ T7658] __sys_sendmsg+0xcd/0x170 [ 1484.199555][ T7658] do_syscall_64+0xc1/0x1d0 [ 1484.199697][ T7658] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1484.199866][ T7658] [ 1484.199866][ T7658] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 1484.200074][ T7658] check_prev_add+0x182/0xce0 [ 1484.200214][ T7658] validate_chain+0x71d/0x9b0 [ 1484.200349][ T7658] __lock_acquire+0xb3f/0x1580 [ 1484.200486][ T7658] lock_sync+0xd7/0x180 [ 1484.200622][ T7658] __synchronize_srcu+0x9e/0x2b0 [ 1484.200761][ T7658] __rtnl_link_unregister+0x14a/0x380 [ 1484.200926][ T7658] rtnl_link_unregister+0x14c/0x1c0 [ 1484.201059][ T7658] nsim_module_exit+0x10/0x1a [netdevsim] [ 1484.201241][ T7658] __do_sys_delete_module+0x2bd/0x470 [ 1484.201408][ T7658] do_syscall_64+0xc1/0x1d0 [ 1484.201542][ T7658] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1484.201707][ T7658] [ 1484.201707][ T7658] other info that might help us debug this: [ 1484.201707][ T7658] [ 1484.201975][ T7658] Possible unsafe locking scenario: [ 1484.201975][ T7658] [ 1484.202173][ T7658] CPU0 CPU1 [ 1484.202307][ T7658] ---- ---- [ 1484.202438][ T7658] lock(rtnl_mutex); [ 1484.202542][ T7658] lock(&ops->srcu); [ 1484.202712][ T7658] lock(rtnl_mutex); [ 1484.202882][ T7658] sync(&ops->srcu); [ 1484.202988][ T7658] [ 1484.202988][ T7658] *** DEADLOCK *** [ 1484.202988][ T7658] [ 1484.203190][ T7658] 2 locks held by modprobe/7658: [ 1484.203322][ T7658] #0: ffffffffb9ddc8d0 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 1484.203603][ T7658] #1: ffffffffb9df7d48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 1484.203839][ T7658] [ 1484.203839][ T7658] stack backtrace: [ 1484.204022][ T7658] CPU: 1 UID: 0 PID: 7658 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 1484.204232][ T7658] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 1484.204536][ T7658] Call Trace: [ 1484.204647][ T7658] [ 1484.204735][ T7658] dump_stack_lvl+0x82/0xd0 [ 1484.204881][ T7658] print_circular_bug+0x2e2/0x4b0 [ 1484.205032][ T7658] check_noncircular+0x2f9/0x3e0 [ 1484.205172][ T7658] ? __pfx_check_noncircular+0x10/0x10 [ 1484.205324][ T7658] ? __kernel_text_address+0x12/0x40 [ 1484.205464][ T7658] ? unwind_get_return_address+0x5e/0xa0 [ 1484.205603][ T7658] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 1484.205772][ T7658] ? arch_stack_walk+0xa2/0xf0 [ 1484.205925][ T7658] ? alloc_chain_hlocks+0x4e0/0x720 [ 1484.206057][ T7658] check_prev_add+0x182/0xce0 [ 1484.206192][ T7658] ? __pfx_stack_trace_save+0x10/0x10 [ 1484.206325][ T7658] validate_chain+0x71d/0x9b0 [ 1484.206464][ T7658] ? __pfx_validate_chain+0x10/0x10 [ 1484.206595][ T7658] ? mark_lock+0x335/0x3e0 [ 1484.206727][ T7658] ? __pfx_validate_chain+0x10/0x10 [ 1484.206865][ T7658] __lock_acquire+0xb3f/0x1580 [ 1484.207001][ T7658] lock_sync+0xd7/0x180 [ 1484.207103][ T7658] ? __synchronize_srcu+0x21/0x2b0 [ 1484.207241][ T7658] __synchronize_srcu+0x9e/0x2b0 [ 1484.207373][ T7658] ? __pfx___synchronize_srcu+0x10/0x10 [ 1484.207510][ T7658] ? hlock_class+0x4e/0x130 [ 1484.207648][ T7658] ? mark_lock+0x38/0x3e0 [ 1484.207750][ T7658] ? kvm_clock_get_cycles+0x18/0x30 [ 1484.207884][ T7658] ? ktime_get_mono_fast_ns+0x84/0x360 [ 1484.208020][ T7658] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 1484.208190][ T7658] __rtnl_link_unregister+0x14a/0x380 [ 1484.208330][ T7658] ? mark_lock+0x38/0x3e0 [ 1484.208432][ T7658] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 1484.208597][ T7658] ? mark_held_locks+0x9e/0xe0 [ 1484.208730][ T7658] rtnl_link_unregister+0x14c/0x1c0 [ 1484.208863][ T7658] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 1484.208995][ T7658] ? __pfx_woken_wake_function+0x10/0x10 [ 1484.209148][ T7658] nsim_module_exit+0x10/0x1a [netdevsim] [ 1484.209293][ T7658] __do_sys_delete_module+0x2bd/0x470 [ 1484.209424][ T7658] ? __pfx___do_sys_delete_module+0x10/0x10 [ 1484.209590][ T7658] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 1484.209757][ T7658] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 1484.209922][ T7658] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 1484.210057][ T7658] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 1484.210224][ T7658] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 1484.210392][ T7658] do_syscall_64+0xc1/0x1d0 [ 1484.210526][ T7658] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1484.210693][ T7658] RIP: 0033:0x7f48b9b685ab [ 1484.210830][ T7658] Code: 73 01 c3 48 8b 0d 55 98 1b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 25 98 1b 00 f7 d8 64 89 01 48 [ 1484.211298][ T7658] RSP: 002b:00007ffeff315e98 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 1484.211505][ T7658] RAX: ffffffffffffffda RBX: 000055af8aca6ab0 RCX: 00007f48b9b685ab [ 1484.211722][ T7658] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055af8aca6b18 [ 1484.211949][ T7658] RBP: 000055af8aca6ab0 R08: 0000000000000000 R09: 0000000000000000 [ 1484.212157][ T7658] R10: 00007f48b9cc7ac0 R11: 0000000000000206 R12: 000055af8aca6b18 [ 1484.212380][ T7658] R13: 0000000000000000 R14: 000055af8aca6b18 R15: 00007ffeff3181c8 [ 1484.212597][ T7658]