[ 27.114764][ T252] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 114.842204][ T641] [ 114.842301][ T641] ====================================================== [ 114.842472][ T641] WARNING: possible circular locking dependency detected [ 114.842632][ T641] 6.12.0-rc5-virtme #1 Not tainted [ 114.842764][ T641] ------------------------------------------------------ [ 114.842925][ T641] modprobe/641 is trying to acquire lock: [ 114.843057][ T641] ffffffffc02eb4e0 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 114.843297][ T641] [ 114.843297][ T641] but task is already holding lock: [ 114.843494][ T641] ffffffff8b9d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 114.843740][ T641] [ 114.843740][ T641] which lock already depends on the new lock. [ 114.843740][ T641] [ 114.843996][ T641] [ 114.843996][ T641] the existing dependency chain (in reverse order) is: [ 114.844220][ T641] [ 114.844220][ T641] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 114.844415][ T641] __lock_acquire+0xb3f/0x1580 [ 114.844551][ T641] lock_acquire.part.0+0xeb/0x330 [ 114.844682][ T641] __mutex_lock+0x149/0xac0 [ 114.844813][ T641] rtnl_newlink+0x64f/0xa20 [ 114.844949][ T641] rtnetlink_rcv_msg+0x712/0xc10 [ 114.845083][ T641] netlink_rcv_skb+0x130/0x360 [ 114.845217][ T641] netlink_unicast+0x44b/0x710 [ 114.845344][ T641] netlink_sendmsg+0x723/0xbe0 [ 114.845473][ T641] ____sys_sendmsg+0x7ac/0xa10 [ 114.845601][ T641] ___sys_sendmsg+0xee/0x170 [ 114.845738][ T641] __sys_sendmsg+0xcd/0x170 [ 114.845868][ T641] do_syscall_64+0xc1/0x1d0 [ 114.845995][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.846153][ T641] [ 114.846153][ T641] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 114.846352][ T641] check_prev_add+0x182/0xce0 [ 114.846484][ T641] validate_chain+0x71d/0x9b0 [ 114.846612][ T641] __lock_acquire+0xb3f/0x1580 [ 114.846740][ T641] lock_sync+0xd7/0x180 [ 114.846872][ T641] __synchronize_srcu+0x9e/0x2b0 [ 114.847002][ T641] __rtnl_link_unregister+0x14a/0x380 [ 114.847165][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 114.847291][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 114.847465][ T641] __do_sys_delete_module+0x2bd/0x470 [ 114.847641][ T641] do_syscall_64+0xc1/0x1d0 [ 114.847781][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.847936][ T641] [ 114.847936][ T641] other info that might help us debug this: [ 114.847936][ T641] [ 114.848196][ T641] Possible unsafe locking scenario: [ 114.848196][ T641] [ 114.848384][ T641] CPU0 CPU1 [ 114.848508][ T641] ---- ---- [ 114.848637][ T641] lock(rtnl_mutex); [ 114.848742][ T641] lock(&ops->srcu); [ 114.848898][ T641] lock(rtnl_mutex); [ 114.849057][ T641] sync(&ops->srcu); [ 114.849155][ T641] [ 114.849155][ T641] *** DEADLOCK *** [ 114.849155][ T641] [ 114.849338][ T641] 2 locks held by modprobe/641: [ 114.849464][ T641] #0: ffffffff8b9b8890 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 114.849723][ T641] #1: ffffffff8b9d4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 114.849955][ T641] [ 114.849955][ T641] stack backtrace: [ 114.850114][ T641] CPU: 3 UID: 0 PID: 641 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 114.850303][ T641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 114.850582][ T641] Call Trace: [ 114.850687][ T641] [ 114.850753][ T641] dump_stack_lvl+0x82/0xd0 [ 114.850886][ T641] print_circular_bug+0x2e2/0x4b0 [ 114.851014][ T641] check_noncircular+0x2f9/0x3e0 [ 114.851141][ T641] ? __pfx_check_noncircular+0x10/0x10 [ 114.851270][ T641] ? __kernel_text_address+0x12/0x40 [ 114.851399][ T641] ? unwind_get_return_address+0x5e/0xa0 [ 114.851534][ T641] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 114.851692][ T641] ? arch_stack_walk+0xa2/0xf0 [ 114.851824][ T641] ? alloc_chain_hlocks+0x4e0/0x720 [ 114.851962][ T641] check_prev_add+0x182/0xce0 [ 114.852087][ T641] ? __pfx_stack_trace_save+0x10/0x10 [ 114.852212][ T641] validate_chain+0x71d/0x9b0 [ 114.852339][ T641] ? __pfx_validate_chain+0x10/0x10 [ 114.852466][ T641] ? mark_lock+0x335/0x3e0 [ 114.852595][ T641] ? __pfx_validate_chain+0x10/0x10 [ 114.852721][ T641] __lock_acquire+0xb3f/0x1580 [ 114.852850][ T641] lock_sync+0xd7/0x180 [ 114.852948][ T641] ? __synchronize_srcu+0x21/0x2b0 [ 114.853073][ T641] __synchronize_srcu+0x9e/0x2b0 [ 114.853200][ T641] ? __pfx___synchronize_srcu+0x10/0x10 [ 114.853326][ T641] ? hlock_class+0x4e/0x130 [ 114.853455][ T641] ? mark_lock+0x38/0x3e0 [ 114.853555][ T641] ? kvm_clock_get_cycles+0x18/0x30 [ 114.853685][ T641] ? ktime_get_mono_fast_ns+0x84/0x360 [ 114.853812][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 114.853979][ T641] __rtnl_link_unregister+0x14a/0x380 [ 114.854109][ T641] ? mark_lock+0x38/0x3e0 [ 114.854204][ T641] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 114.854361][ T641] ? mark_held_locks+0x9e/0xe0 [ 114.854489][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 114.854623][ T641] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 114.854751][ T641] ? __pfx_woken_wake_function+0x10/0x10 [ 114.854883][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 114.855021][ T641] __do_sys_delete_module+0x2bd/0x470 [ 114.855150][ T641] ? __pfx___do_sys_delete_module+0x10/0x10 [ 114.855318][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.855482][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.855638][ T641] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 114.855771][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.855929][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 114.856090][ T641] do_syscall_64+0xc1/0x1d0 [ 114.856222][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.856382][ T641] RIP: 0033:0x7f0e66ee95ab [ 114.856519][ T641] 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 [ 114.856963][ T641] RSP: 002b:00007ffda0c78b88 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 114.857156][ T641] RAX: ffffffffffffffda RBX: 0000562093a62980 RCX: 00007f0e66ee95ab [ 114.857347][ T641] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000562093a629e8 [ 114.857542][ T641] RBP: 0000562093a62980 R08: 0000000000000000 R09: 0000000000000000 [ 114.857743][ T641] R10: 00007f0e67048ac0 R11: 0000000000000206 R12: 0000562093a629e8 [ 114.857937][ T641] R13: 0000000000000000 R14: 0000562093a629e8 R15: 00007ffda0c7aeb8 [ 114.858138][ T641]