[ 28.395771][ T251] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 62.144532][ T388] ip (388) used greatest stack depth: 23104 bytes left [ 114.887960][ T639] [ 114.888070][ T639] ====================================================== [ 114.888234][ T639] WARNING: possible circular locking dependency detected [ 114.888394][ T639] 6.12.0-rc5-virtme #1 Not tainted [ 114.888528][ T639] ------------------------------------------------------ [ 114.888684][ T639] modprobe/639 is trying to acquire lock: [ 114.888810][ T639] ffffffffc0237420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 114.889045][ T639] [ 114.889045][ T639] but task is already holding lock: [ 114.889228][ T639] ffffffff91bd3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 114.889459][ T639] [ 114.889459][ T639] which lock already depends on the new lock. [ 114.889459][ T639] [ 114.889705][ T639] [ 114.889705][ T639] the existing dependency chain (in reverse order) is: [ 114.889917][ T639] [ 114.889917][ T639] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 114.890118][ T639] __lock_acquire+0xb3f/0x1580 [ 114.890252][ T639] lock_acquire.part.0+0xeb/0x330 [ 114.890379][ T639] __mutex_lock+0x149/0xac0 [ 114.890507][ T639] rtnl_newlink+0x64b/0xa30 [ 114.890633][ T639] rtnetlink_rcv_msg+0x712/0xc10 [ 114.890760][ T639] netlink_rcv_skb+0x130/0x360 [ 114.890888][ T639] netlink_unicast+0x44b/0x710 [ 114.891015][ T639] netlink_sendmsg+0x723/0xbe0 [ 114.891140][ T639] ____sys_sendmsg+0x7ac/0xa10 [ 114.891269][ T639] ___sys_sendmsg+0xee/0x170 [ 114.891397][ T639] __sys_sendmsg+0xcd/0x170 [ 114.891521][ T639] do_syscall_64+0xc1/0x1d0 [ 114.891648][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.891809][ T639] [ 114.891809][ T639] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 114.891999][ T639] check_prev_add+0x182/0xce0 [ 114.892125][ T639] validate_chain+0x71d/0x9b0 [ 114.892250][ T639] __lock_acquire+0xb3f/0x1580 [ 114.892378][ T639] lock_sync+0xd7/0x180 [ 114.892502][ T639] __synchronize_srcu+0x9e/0x2b0 [ 114.892629][ T639] __rtnl_link_unregister+0x14a/0x380 [ 114.892788][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 114.892912][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 114.893084][ T639] __do_sys_delete_module+0x2bd/0x470 [ 114.893238][ T639] do_syscall_64+0xc1/0x1d0 [ 114.893365][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.893520][ T639] [ 114.893520][ T639] other info that might help us debug this: [ 114.893520][ T639] [ 114.893762][ T639] Possible unsafe locking scenario: [ 114.893762][ T639] [ 114.893944][ T639] CPU0 CPU1 [ 114.894086][ T639] ---- ---- [ 114.894211][ T639] lock(rtnl_mutex); [ 114.894315][ T639] lock(&ops->srcu); [ 114.894472][ T639] lock(rtnl_mutex); [ 114.894631][ T639] sync(&ops->srcu); [ 114.894728][ T639] [ 114.894728][ T639] *** DEADLOCK *** [ 114.894728][ T639] [ 114.894913][ T639] 2 locks held by modprobe/639: [ 114.895039][ T639] #0: ffffffff91bb8790 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 114.895305][ T639] #1: ffffffff91bd3a88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 114.895527][ T639] [ 114.895527][ T639] stack backtrace: [ 114.895691][ T639] CPU: 1 UID: 0 PID: 639 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 114.895891][ T639] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 114.896171][ T639] Call Trace: [ 114.896273][ T639] [ 114.896340][ T639] dump_stack_lvl+0x82/0xd0 [ 114.896473][ T639] print_circular_bug+0x2e2/0x4b0 [ 114.896605][ T639] check_noncircular+0x2f9/0x3e0 [ 114.896733][ T639] ? __pfx_check_noncircular+0x10/0x10 [ 114.896866][ T639] ? __kernel_text_address+0x12/0x40 [ 114.896994][ T639] ? unwind_get_return_address+0x5e/0xa0 [ 114.897123][ T639] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 114.897286][ T639] ? arch_stack_walk+0xa2/0xf0 [ 114.897414][ T639] ? alloc_chain_hlocks+0x4e0/0x720 [ 114.897549][ T639] check_prev_add+0x182/0xce0 [ 114.897674][ T639] ? __pfx_stack_trace_save+0x10/0x10 [ 114.897807][ T639] validate_chain+0x71d/0x9b0 [ 114.897937][ T639] ? __pfx_validate_chain+0x10/0x10 [ 114.898061][ T639] ? mark_lock+0x335/0x3e0 [ 114.898186][ T639] ? __pfx_validate_chain+0x10/0x10 [ 114.898314][ T639] __lock_acquire+0xb3f/0x1580 [ 114.898441][ T639] lock_sync+0xd7/0x180 [ 114.898541][ T639] ? __synchronize_srcu+0x21/0x2b0 [ 114.898668][ T639] __synchronize_srcu+0x9e/0x2b0 [ 114.898794][ T639] ? __pfx___synchronize_srcu+0x10/0x10 [ 114.898929][ T639] ? hlock_class+0x4e/0x130 [ 114.899056][ T639] ? mark_lock+0x38/0x3e0 [ 114.899154][ T639] ? kvm_clock_get_cycles+0x18/0x30 [ 114.899281][ T639] ? ktime_get_mono_fast_ns+0x84/0x360 [ 114.899407][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 114.899564][ T639] __rtnl_link_unregister+0x14a/0x380 [ 114.899700][ T639] ? mark_lock+0x38/0x3e0 [ 114.899798][ T639] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 114.899955][ T639] ? mark_held_locks+0x9e/0xe0 [ 114.900083][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 114.900210][ T639] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 114.900349][ T639] ? __pfx_woken_wake_function+0x10/0x10 [ 114.900479][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 114.900615][ T639] __do_sys_delete_module+0x2bd/0x470 [ 114.900745][ T639] ? __pfx___do_sys_delete_module+0x10/0x10 [ 114.900895][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.901055][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.901211][ T639] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 114.901354][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 114.901509][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 114.901681][ T639] do_syscall_64+0xc1/0x1d0 [ 114.901808][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 114.901964][ T639] RIP: 0033:0x7f3b14b4b5ab [ 114.902098][ T639] 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 [ 114.902544][ T639] RSP: 002b:00007ffe25c35818 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 114.902741][ T639] RAX: ffffffffffffffda RBX: 000056280848b980 RCX: 00007f3b14b4b5ab [ 114.902930][ T639] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000056280848b9e8 [ 114.903118][ T639] RBP: 000056280848b980 R08: 0000000000000000 R09: 0000000000000000 [ 114.903318][ T639] R10: 00007f3b14caaac0 R11: 0000000000000206 R12: 000056280848b9e8 [ 114.903512][ T639] R13: 0000000000000000 R14: 000056280848b9e8 R15: 00007ffe25c37b48 [ 114.903701][ T639]