[ 27.220494][ T256] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 31.393707][ T297] ip (297) used greatest stack depth: 23192 bytes left [ 61.537700][ T606] Failed to register fib notifier [ 121.941125][ T1195] Failed to register fib notifier [ 163.975786][ T1563] Failed to register fib notifier [ 221.252434][ T2152] Failed to register fib notifier [ 223.310190][ T2183] [ 223.310285][ T2183] ====================================================== [ 223.310455][ T2183] WARNING: possible circular locking dependency detected [ 223.310618][ T2183] 6.12.0-rc5-virtme #1 Not tainted [ 223.310763][ T2183] ------------------------------------------------------ [ 223.310939][ T2183] modprobe/2183 is trying to acquire lock: [ 223.311109][ T2183] ffffffffc055f420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 223.311364][ T2183] [ 223.311364][ T2183] but task is already holding lock: [ 223.311562][ T2183] ffffffff8f5d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 223.311794][ T2183] [ 223.311794][ T2183] which lock already depends on the new lock. [ 223.311794][ T2183] [ 223.312054][ T2183] [ 223.312054][ T2183] the existing dependency chain (in reverse order) is: [ 223.312289][ T2183] [ 223.312289][ T2183] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 223.312493][ T2183] __lock_acquire+0xb3f/0x1580 [ 223.312633][ T2183] lock_acquire.part.0+0xeb/0x330 [ 223.312766][ T2183] __mutex_lock+0x149/0xac0 [ 223.312899][ T2183] rtnl_newlink+0x64b/0xa30 [ 223.313032][ T2183] rtnetlink_rcv_msg+0x712/0xc10 [ 223.313168][ T2183] netlink_rcv_skb+0x130/0x360 [ 223.313298][ T2183] netlink_unicast+0x44b/0x710 [ 223.313429][ T2183] netlink_sendmsg+0x723/0xbe0 [ 223.313563][ T2183] ____sys_sendmsg+0x7ac/0xa10 [ 223.313703][ T2183] ___sys_sendmsg+0xee/0x170 [ 223.313839][ T2183] __sys_sendmsg+0xcd/0x170 [ 223.313975][ T2183] do_syscall_64+0xc1/0x1d0 [ 223.314124][ T2183] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 223.314308][ T2183] [ 223.314308][ T2183] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 223.314501][ T2183] check_prev_add+0x182/0xce0 [ 223.314638][ T2183] validate_chain+0x71d/0x9b0 [ 223.314765][ T2183] __lock_acquire+0xb3f/0x1580 [ 223.314901][ T2183] lock_sync+0xd7/0x180 [ 223.315032][ T2183] __synchronize_srcu+0x9e/0x2b0 [ 223.315162][ T2183] __rtnl_link_unregister+0x14a/0x380 [ 223.315327][ T2183] rtnl_link_unregister+0x14c/0x1c0 [ 223.315460][ T2183] nsim_module_exit+0x10/0x1a [netdevsim] [ 223.315647][ T2183] __do_sys_delete_module+0x2bd/0x470 [ 223.315809][ T2183] do_syscall_64+0xc1/0x1d0 [ 223.315936][ T2183] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 223.316106][ T2183] [ 223.316106][ T2183] other info that might help us debug this: [ 223.316106][ T2183] [ 223.316365][ T2183] Possible unsafe locking scenario: [ 223.316365][ T2183] [ 223.316568][ T2183] CPU0 CPU1 [ 223.316699][ T2183] ---- ---- [ 223.316828][ T2183] lock(rtnl_mutex); [ 223.316930][ T2183] lock(&ops->srcu); [ 223.317101][ T2183] lock(rtnl_mutex); [ 223.317270][ T2183] sync(&ops->srcu); [ 223.317372][ T2183] [ 223.317372][ T2183] *** DEADLOCK *** [ 223.317372][ T2183] [ 223.317575][ T2183] 2 locks held by modprobe/2183: [ 223.317710][ T2183] #0: ffffffff8f5b8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 223.317979][ T2183] #1: ffffffff8f5d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 223.318209][ T2183] [ 223.318209][ T2183] stack backtrace: [ 223.318451][ T2183] CPU: 3 UID: 0 PID: 2183 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 223.318645][ T2183] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 223.318932][ T2183] Call Trace: [ 223.319040][ T2183] [ 223.319108][ T2183] dump_stack_lvl+0x82/0xd0 [ 223.319243][ T2183] print_circular_bug+0x2e2/0x4b0 [ 223.319374][ T2183] check_noncircular+0x2f9/0x3e0 [ 223.319588][ T2183] ? __pfx_check_noncircular+0x10/0x10 [ 223.319720][ T2183] ? __kernel_text_address+0x12/0x40 [ 223.319850][ T2183] ? unwind_get_return_address+0x5e/0xa0 [ 223.319979][ T2183] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 223.320210][ T2183] ? arch_stack_walk+0xa2/0xf0 [ 223.320342][ T2183] ? alloc_chain_hlocks+0x4e0/0x720 [ 223.320471][ T2183] check_prev_add+0x182/0xce0 [ 223.320596][ T2183] ? __pfx_stack_trace_save+0x10/0x10 [ 223.320726][ T2183] validate_chain+0x71d/0x9b0 [ 223.320928][ T2183] ? __pfx_validate_chain+0x10/0x10 [ 223.321054][ T2183] ? mark_lock+0x335/0x3e0 [ 223.321179][ T2183] ? __pfx_validate_chain+0x10/0x10 [ 223.321305][ T2183] __lock_acquire+0xb3f/0x1580 [ 223.321501][ T2183] lock_sync+0xd7/0x180 [ 223.321598][ T2183] ? __synchronize_srcu+0x21/0x2b0 [ 223.321726][ T2183] __synchronize_srcu+0x9e/0x2b0 [ 223.321854][ T2183] ? __pfx___synchronize_srcu+0x10/0x10 [ 223.322052][ T2183] ? hlock_class+0x4e/0x130 [ 223.322186][ T2183] ? mark_lock+0x38/0x3e0 [ 223.322290][ T2183] ? kvm_clock_get_cycles+0x18/0x30 [ 223.322417][ T2183] ? ktime_get_mono_fast_ns+0x84/0x360 [ 223.322546][ T2183] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 223.322778][ T2183] __rtnl_link_unregister+0x14a/0x380 [ 223.322911][ T2183] ? mark_lock+0x38/0x3e0 [ 223.323008][ T2183] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 223.323163][ T2183] ? mark_held_locks+0x9e/0xe0 [ 223.323363][ T2183] rtnl_link_unregister+0x14c/0x1c0 [ 223.323493][ T2183] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 223.323623][ T2183] ? __pfx_woken_wake_function+0x10/0x10 [ 223.323752][ T2183] nsim_module_exit+0x10/0x1a [netdevsim] [ 223.323890][ T2183] __do_sys_delete_module+0x2bd/0x470 [ 223.324023][ T2183] ? __pfx___do_sys_delete_module+0x10/0x10 [ 223.324193][ T2183] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 223.324358][ T2183] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 223.324527][ T2183] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 223.324665][ T2183] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 223.324984][ T2183] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 223.325149][ T2183] do_syscall_64+0xc1/0x1d0 [ 223.325287][ T2183] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 223.325456][ T2183] RIP: 0033:0x7f5bfc5655ab [ 223.325678][ T2183] 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 [ 223.326151][ T2183] RSP: 002b:00007ffee5d9f038 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 223.326430][ T2183] RAX: ffffffffffffffda RBX: 0000562457975980 RCX: 00007f5bfc5655ab [ 223.326625][ T2183] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 00005624579759e8 [ 223.326823][ T2183] RBP: 0000562457975980 R08: 0000000000000000 R09: 0000000000000000 [ 223.327098][ T2183] R10: 00007f5bfc6c4ac0 R11: 0000000000000206 R12: 00005624579759e8 [ 223.327289][ T2183] R13: 0000000000000000 R14: 00005624579759e8 R15: 00007ffee5da1368 [ 223.327490][ T2183]