[ 256.096835][ T2480] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 260.461880][ T2518] ip (2518) used greatest stack depth: 23632 bytes left [ 293.049811][ T2827] Failed to register fib notifier [ 354.715227][ T3418] Failed to register fib notifier [ 390.439787][ T3786] Failed to register fib notifier [ 448.899836][ T4376] Failed to register fib notifier [ 450.989923][ T4407] [ 450.990039][ T4407] ====================================================== [ 450.990198][ T4407] WARNING: possible circular locking dependency detected [ 450.990385][ T4407] 6.12.0-rc5-virtme #1 Not tainted [ 450.990525][ T4407] ------------------------------------------------------ [ 450.990681][ T4407] modprobe/4407 is trying to acquire lock: [ 450.990865][ T4407] ffffffffc035a420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 450.991102][ T4407] [ 450.991102][ T4407] but task is already holding lock: [ 450.991295][ T4407] ffffffff86dd3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 450.991543][ T4407] [ 450.991543][ T4407] which lock already depends on the new lock. [ 450.991543][ T4407] [ 450.991803][ T4407] [ 450.991803][ T4407] the existing dependency chain (in reverse order) is: [ 450.992051][ T4407] [ 450.992051][ T4407] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 450.992255][ T4407] __lock_acquire+0xb3f/0x1580 [ 450.992396][ T4407] lock_acquire.part.0+0xeb/0x330 [ 450.992529][ T4407] __mutex_lock+0x149/0xac0 [ 450.992670][ T4407] rtnl_newlink+0x64b/0xa30 [ 450.992795][ T4407] rtnetlink_rcv_msg+0x712/0xc10 [ 450.992953][ T4407] netlink_rcv_skb+0x130/0x360 [ 450.993083][ T4407] netlink_unicast+0x44b/0x710 [ 450.993222][ T4407] netlink_sendmsg+0x723/0xbe0 [ 450.993370][ T4407] ____sys_sendmsg+0x7ac/0xa10 [ 450.993504][ T4407] ___sys_sendmsg+0xee/0x170 [ 450.993639][ T4407] __sys_sendmsg+0xcd/0x170 [ 450.993763][ T4407] do_syscall_64+0xc1/0x1d0 [ 450.993889][ T4407] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 450.994047][ T4407] [ 450.994047][ T4407] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 450.994239][ T4407] check_prev_add+0x182/0xce0 [ 450.994368][ T4407] validate_chain+0x71d/0x9b0 [ 450.994492][ T4407] __lock_acquire+0xb3f/0x1580 [ 450.994647][ T4407] lock_sync+0xd7/0x180 [ 450.994772][ T4407] __synchronize_srcu+0x9e/0x2b0 [ 450.994895][ T4407] __rtnl_link_unregister+0x14a/0x380 [ 450.995061][ T4407] rtnl_link_unregister+0x14c/0x1c0 [ 450.995189][ T4407] nsim_module_exit+0x10/0x1a [netdevsim] [ 450.995380][ T4407] __do_sys_delete_module+0x2bd/0x470 [ 450.995547][ T4407] do_syscall_64+0xc1/0x1d0 [ 450.995703][ T4407] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 450.995864][ T4407] [ 450.995864][ T4407] other info that might help us debug this: [ 450.995864][ T4407] [ 450.996130][ T4407] Possible unsafe locking scenario: [ 450.996130][ T4407] [ 450.996328][ T4407] CPU0 CPU1 [ 450.996449][ T4407] ---- ---- [ 450.996571][ T4407] lock(rtnl_mutex); [ 450.996706][ T4407] lock(&ops->srcu); [ 450.996864][ T4407] lock(rtnl_mutex); [ 450.997044][ T4407] sync(&ops->srcu); [ 450.997144][ T4407] [ 450.997144][ T4407] *** DEADLOCK *** [ 450.997144][ T4407] [ 450.997336][ T4407] 2 locks held by modprobe/4407: [ 450.997463][ T4407] #0: ffffffff86db8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 450.997719][ T4407] #1: ffffffff86dd3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 450.997940][ T4407] [ 450.997940][ T4407] stack backtrace: [ 450.998100][ T4407] CPU: 1 UID: 0 PID: 4407 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 450.998285][ T4407] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 450.998570][ T4407] Call Trace: [ 450.998669][ T4407] [ 450.998735][ T4407] dump_stack_lvl+0x82/0xd0 [ 450.998870][ T4407] print_circular_bug+0x2e2/0x4b0 [ 450.999000][ T4407] check_noncircular+0x2f9/0x3e0 [ 450.999125][ T4407] ? __pfx_check_noncircular+0x10/0x10 [ 450.999252][ T4407] ? __kernel_text_address+0x12/0x40 [ 450.999381][ T4407] ? unwind_get_return_address+0x5e/0xa0 [ 450.999511][ T4407] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 450.999674][ T4407] ? arch_stack_walk+0xa2/0xf0 [ 450.999804][ T4407] check_prev_add+0x182/0xce0 [ 450.999928][ T4407] ? __pfx_stack_trace_save+0x10/0x10 [ 451.000055][ T4407] validate_chain+0x71d/0x9b0 [ 451.000183][ T4407] ? __pfx_validate_chain+0x10/0x10 [ 451.000307][ T4407] ? mark_lock+0x335/0x3e0 [ 451.000433][ T4407] ? __pfx_validate_chain+0x10/0x10 [ 451.000568][ T4407] __lock_acquire+0xb3f/0x1580 [ 451.000697][ T4407] lock_sync+0xd7/0x180 [ 451.000797][ T4407] ? __synchronize_srcu+0x21/0x2b0 [ 451.000923][ T4407] __synchronize_srcu+0x9e/0x2b0 [ 451.001052][ T4407] ? __pfx___synchronize_srcu+0x10/0x10 [ 451.001177][ T4407] ? hlock_class+0x4e/0x130 [ 451.001310][ T4407] ? mark_lock+0x38/0x3e0 [ 451.001406][ T4407] ? kvm_clock_get_cycles+0x18/0x30 [ 451.001542][ T4407] ? ktime_get_mono_fast_ns+0x84/0x360 [ 451.001670][ T4407] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 451.001831][ T4407] __rtnl_link_unregister+0x14a/0x380 [ 451.001955][ T4407] ? mark_lock+0x38/0x3e0 [ 451.002053][ T4407] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 451.002208][ T4407] ? mark_held_locks+0x9e/0xe0 [ 451.002341][ T4407] rtnl_link_unregister+0x14c/0x1c0 [ 451.002468][ T4407] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 451.002595][ T4407] ? __pfx_woken_wake_function+0x10/0x10 [ 451.002723][ T4407] nsim_module_exit+0x10/0x1a [netdevsim] [ 451.002856][ T4407] __do_sys_delete_module+0x2bd/0x470 [ 451.002983][ T4407] ? __pfx___do_sys_delete_module+0x10/0x10 [ 451.003144][ T4407] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 451.003329][ T4407] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 451.003575][ T4407] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 451.003712][ T4407] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 451.003866][ T4407] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 451.004045][ T4407] do_syscall_64+0xc1/0x1d0 [ 451.004245][ T4407] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 451.004435][ T4407] RIP: 0033:0x7f19b78735ab [ 451.004571][ T4407] 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 [ 451.005119][ T4407] RSP: 002b:00007ffe36dbde28 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 451.005306][ T4407] RAX: ffffffffffffffda RBX: 000056032150e980 RCX: 00007f19b78735ab [ 451.005591][ T4407] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000056032150e9e8 [ 451.005778][ T4407] RBP: 000056032150e980 R08: 0000000000000000 R09: 0000000000000000 [ 451.005966][ T4407] R10: 00007f19b79d2ac0 R11: 0000000000000206 R12: 000056032150e9e8 [ 451.006222][ T4407] R13: 0000000000000000 R14: 000056032150e9e8 R15: 00007ffe36dc0158 [ 451.006421][ T4407]