[ 26.131220][ T251] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 112.940140][ T637] [ 112.940280][ T637] ====================================================== [ 112.940530][ T637] WARNING: possible circular locking dependency detected [ 112.940778][ T637] 6.12.0-rc5-virtme #1 Not tainted [ 112.940985][ T637] ------------------------------------------------------ [ 112.941257][ T637] modprobe/637 is trying to acquire lock: [ 112.941457][ T637] ffffffffc0236420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 112.941826][ T637] [ 112.941826][ T637] but task is already holding lock: [ 112.942124][ T637] ffffffffb09d3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 112.942504][ T637] [ 112.942504][ T637] which lock already depends on the new lock. [ 112.942504][ T637] [ 112.942926][ T637] [ 112.942926][ T637] the existing dependency chain (in reverse order) is: [ 112.943268][ T637] [ 112.943268][ T637] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 112.943584][ T637] __lock_acquire+0xb3f/0x1580 [ 112.943797][ T637] lock_acquire.part.0+0xeb/0x330 [ 112.943993][ T637] __mutex_lock+0x149/0xac0 [ 112.944222][ T637] rtnl_newlink+0x64b/0xa30 [ 112.944441][ T637] rtnetlink_rcv_msg+0x712/0xc10 [ 112.944655][ T637] netlink_rcv_skb+0x130/0x360 [ 112.944827][ T637] netlink_unicast+0x44b/0x710 [ 112.945026][ T637] netlink_sendmsg+0x723/0xbe0 [ 112.945236][ T637] ____sys_sendmsg+0x7ac/0xa10 [ 112.945385][ T637] ___sys_sendmsg+0xee/0x170 [ 112.945592][ T637] __sys_sendmsg+0xcd/0x170 [ 112.945799][ T637] do_syscall_64+0xc1/0x1d0 [ 112.946005][ T637] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.946272][ T637] [ 112.946272][ T637] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 112.946598][ T637] check_prev_add+0x182/0xce0 [ 112.946784][ T637] validate_chain+0x71d/0x9b0 [ 112.947003][ T637] __lock_acquire+0xb3f/0x1580 [ 112.947210][ T637] lock_sync+0xd7/0x180 [ 112.947423][ T637] __synchronize_srcu+0x9e/0x2b0 [ 112.947635][ T637] __rtnl_link_unregister+0x14a/0x380 [ 112.947903][ T637] rtnl_link_unregister+0x14c/0x1c0 [ 112.948127][ T637] nsim_module_exit+0x10/0x1a [netdevsim] [ 112.948430][ T637] __do_sys_delete_module+0x2bd/0x470 [ 112.948699][ T637] do_syscall_64+0xc1/0x1d0 [ 112.948917][ T637] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.949188][ T637] [ 112.949188][ T637] other info that might help us debug this: [ 112.949188][ T637] [ 112.949600][ T637] Possible unsafe locking scenario: [ 112.949600][ T637] [ 112.949919][ T637] CPU0 CPU1 [ 112.950139][ T637] ---- ---- [ 112.950351][ T637] lock(rtnl_mutex); [ 112.950516][ T637] lock(&ops->srcu); [ 112.950773][ T637] lock(rtnl_mutex); [ 112.951035][ T637] sync(&ops->srcu); [ 112.951203][ T637] [ 112.951203][ T637] *** DEADLOCK *** [ 112.951203][ T637] [ 112.951501][ T637] 2 locks held by modprobe/637: [ 112.951727][ T637] #0: ffffffffb09b8790 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 112.952170][ T637] #1: ffffffffb09d3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 112.952546][ T637] [ 112.952546][ T637] stack backtrace: [ 112.952807][ T637] CPU: 3 UID: 0 PID: 637 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 112.953134][ T637] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 112.953604][ T637] Call Trace: [ 112.953774][ T637] [ 112.953885][ T637] dump_stack_lvl+0x82/0xd0 [ 112.954114][ T637] print_circular_bug+0x2e2/0x4b0 [ 112.954333][ T637] check_noncircular+0x2f9/0x3e0 [ 112.954553][ T637] ? __pfx_check_noncircular+0x10/0x10 [ 112.954769][ T637] ? __kernel_text_address+0x12/0x40 [ 112.954987][ T637] ? unwind_get_return_address+0x5e/0xa0 [ 112.955205][ T637] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 112.955474][ T637] ? arch_stack_walk+0xa2/0xf0 [ 112.955696][ T637] ? alloc_chain_hlocks+0x4e0/0x720 [ 112.955909][ T637] check_prev_add+0x182/0xce0 [ 112.956124][ T637] ? __pfx_stack_trace_save+0x10/0x10 [ 112.956334][ T637] validate_chain+0x71d/0x9b0 [ 112.956557][ T637] ? __pfx_validate_chain+0x10/0x10 [ 112.956769][ T637] ? mark_lock+0x335/0x3e0 [ 112.956989][ T637] ? __pfx_validate_chain+0x10/0x10 [ 112.957212][ T637] __lock_acquire+0xb3f/0x1580 [ 112.957436][ T637] lock_sync+0xd7/0x180 [ 112.957598][ T637] ? __synchronize_srcu+0x21/0x2b0 [ 112.957822][ T637] __synchronize_srcu+0x9e/0x2b0 [ 112.958031][ T637] ? __pfx___synchronize_srcu+0x10/0x10 [ 112.958251][ T637] ? hlock_class+0x4e/0x130 [ 112.958463][ T637] ? mark_lock+0x38/0x3e0 [ 112.958626][ T637] ? kvm_clock_get_cycles+0x18/0x30 [ 112.958834][ T637] ? ktime_get_mono_fast_ns+0x84/0x360 [ 112.959046][ T637] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 112.959317][ T637] __rtnl_link_unregister+0x14a/0x380 [ 112.959531][ T637] ? mark_lock+0x38/0x3e0 [ 112.959695][ T637] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 112.959955][ T637] ? mark_held_locks+0x9e/0xe0 [ 112.960178][ T637] rtnl_link_unregister+0x14c/0x1c0 [ 112.960389][ T637] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 112.960601][ T637] ? __pfx_woken_wake_function+0x10/0x10 [ 112.960820][ T637] nsim_module_exit+0x10/0x1a [netdevsim] [ 112.961057][ T637] __do_sys_delete_module+0x2bd/0x470 [ 112.961282][ T637] ? __pfx___do_sys_delete_module+0x10/0x10 [ 112.961544][ T637] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.961799][ T637] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.962059][ T637] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 112.962258][ T637] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.962504][ T637] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 112.962761][ T637] do_syscall_64+0xc1/0x1d0 [ 112.962959][ T637] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.963218][ T637] RIP: 0033:0x7f7691e4d5ab [ 112.963446][ T637] 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 [ 112.964181][ T637] RSP: 002b:00007ffebbf83dc8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 112.964494][ T637] RAX: ffffffffffffffda RBX: 000055f64adc9980 RCX: 00007f7691e4d5ab [ 112.964814][ T637] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055f64adc99e8 [ 112.965124][ T637] RBP: 000055f64adc9980 R08: 0000000000000000 R09: 0000000000000000 [ 112.965448][ T637] R10: 00007f7691facac0 R11: 0000000000000206 R12: 000055f64adc99e8 [ 112.965767][ T637] R13: 0000000000000000 R14: 000055f64adc99e8 R15: 00007ffebbf860f8 [ 112.966097][ T637]