[ 28.056539][ T251] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 116.257629][ T641] [ 116.257734][ T641] ====================================================== [ 116.257928][ T641] WARNING: possible circular locking dependency detected [ 116.258100][ T641] 6.12.0-rc5-virtme #1 Not tainted [ 116.258226][ T641] ------------------------------------------------------ [ 116.258383][ T641] modprobe/641 is trying to acquire lock: [ 116.258512][ T641] ffffffffc04da4e0 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 116.258766][ T641] [ 116.258766][ T641] but task is already holding lock: [ 116.258990][ T641] ffffffffbadd4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 116.259334][ T641] [ 116.259334][ T641] which lock already depends on the new lock. [ 116.259334][ T641] [ 116.259585][ T641] [ 116.259585][ T641] the existing dependency chain (in reverse order) is: [ 116.259806][ T641] [ 116.259806][ T641] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 116.260000][ T641] __lock_acquire+0xb3f/0x1580 [ 116.260133][ T641] lock_acquire.part.0+0xeb/0x330 [ 116.260268][ T641] __mutex_lock+0x149/0xac0 [ 116.260419][ T641] rtnl_newlink+0x64f/0xa20 [ 116.260546][ T641] rtnetlink_rcv_msg+0x712/0xc10 [ 116.260676][ T641] netlink_rcv_skb+0x130/0x360 [ 116.260818][ T641] netlink_unicast+0x44b/0x710 [ 116.260957][ T641] netlink_sendmsg+0x723/0xbe0 [ 116.261088][ T641] ____sys_sendmsg+0x7ac/0xa10 [ 116.261244][ T641] ___sys_sendmsg+0xee/0x170 [ 116.261376][ T641] __sys_sendmsg+0xcd/0x170 [ 116.261530][ T641] do_syscall_64+0xc1/0x1d0 [ 116.261673][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 116.261876][ T641] [ 116.261876][ T641] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 116.262078][ T641] check_prev_add+0x182/0xce0 [ 116.262240][ T641] validate_chain+0x71d/0x9b0 [ 116.262373][ T641] __lock_acquire+0xb3f/0x1580 [ 116.262508][ T641] lock_sync+0xd7/0x180 [ 116.262661][ T641] __synchronize_srcu+0x9e/0x2b0 [ 116.262815][ T641] __rtnl_link_unregister+0x14a/0x380 [ 116.263012][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 116.263144][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 116.263374][ T641] __do_sys_delete_module+0x2bd/0x470 [ 116.263562][ T641] do_syscall_64+0xc1/0x1d0 [ 116.263715][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 116.263887][ T641] [ 116.263887][ T641] other info that might help us debug this: [ 116.263887][ T641] [ 116.264178][ T641] Possible unsafe locking scenario: [ 116.264178][ T641] [ 116.264413][ T641] CPU0 CPU1 [ 116.264544][ T641] ---- ---- [ 116.264679][ T641] lock(rtnl_mutex); [ 116.264788][ T641] lock(&ops->srcu); [ 116.264948][ T641] lock(rtnl_mutex); [ 116.265111][ T641] sync(&ops->srcu); [ 116.265216][ T641] [ 116.265216][ T641] *** DEADLOCK *** [ 116.265216][ T641] [ 116.265408][ T641] 2 locks held by modprobe/641: [ 116.265541][ T641] #0: ffffffffbadb8890 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 116.265813][ T641] #1: ffffffffbadd4908 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 116.266064][ T641] [ 116.266064][ T641] stack backtrace: [ 116.266228][ T641] CPU: 0 UID: 0 PID: 641 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 116.266433][ T641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 116.266732][ T641] Call Trace: [ 116.266847][ T641] [ 116.266918][ T641] dump_stack_lvl+0x82/0xd0 [ 116.267079][ T641] print_circular_bug+0x2e2/0x4b0 [ 116.267212][ T641] check_noncircular+0x2f9/0x3e0 [ 116.267342][ T641] ? __pfx_check_noncircular+0x10/0x10 [ 116.267474][ T641] ? __kernel_text_address+0x12/0x40 [ 116.267605][ T641] ? unwind_get_return_address+0x5e/0xa0 [ 116.267737][ T641] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 116.267896][ T641] ? arch_stack_walk+0xa2/0xf0 [ 116.268026][ T641] ? alloc_chain_hlocks+0x4e0/0x720 [ 116.268159][ T641] check_prev_add+0x182/0xce0 [ 116.268287][ T641] ? __pfx_stack_trace_save+0x10/0x10 [ 116.268417][ T641] validate_chain+0x71d/0x9b0 [ 116.268546][ T641] ? __pfx_validate_chain+0x10/0x10 [ 116.268673][ T641] ? mark_lock+0x335/0x3e0 [ 116.268806][ T641] ? __pfx_validate_chain+0x10/0x10 [ 116.268934][ T641] __lock_acquire+0xb3f/0x1580 [ 116.269065][ T641] lock_sync+0xd7/0x180 [ 116.269163][ T641] ? __synchronize_srcu+0x21/0x2b0 [ 116.269293][ T641] __synchronize_srcu+0x9e/0x2b0 [ 116.269418][ T641] ? __pfx___synchronize_srcu+0x10/0x10 [ 116.269549][ T641] ? hlock_class+0x4e/0x130 [ 116.269678][ T641] ? mark_lock+0x38/0x3e0 [ 116.269778][ T641] ? kvm_clock_get_cycles+0x18/0x30 [ 116.269910][ T641] ? ktime_get_mono_fast_ns+0x84/0x360 [ 116.270042][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 116.270207][ T641] __rtnl_link_unregister+0x14a/0x380 [ 116.270336][ T641] ? mark_lock+0x38/0x3e0 [ 116.270436][ T641] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 116.270615][ T641] ? mark_held_locks+0x9e/0xe0 [ 116.270745][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 116.270879][ T641] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 116.271008][ T641] ? __pfx_woken_wake_function+0x10/0x10 [ 116.271149][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 116.271291][ T641] __do_sys_delete_module+0x2bd/0x470 [ 116.271441][ T641] ? __pfx___do_sys_delete_module+0x10/0x10 [ 116.271602][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 116.271794][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 116.271959][ T641] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 116.272088][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 116.272268][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 116.272439][ T641] do_syscall_64+0xc1/0x1d0 [ 116.272585][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 116.272759][ T641] RIP: 0033:0x7f7ff565e5ab [ 116.272914][ 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 [ 116.273385][ T641] RSP: 002b:00007ffe00c391f8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 116.273582][ T641] RAX: ffffffffffffffda RBX: 0000559ee0331980 RCX: 00007f7ff565e5ab [ 116.273801][ T641] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000559ee03319e8 [ 116.274025][ T641] RBP: 0000559ee0331980 R08: 0000000000000000 R09: 0000000000000000 [ 116.274227][ T641] R10: 00007f7ff57bdac0 R11: 0000000000000206 R12: 0000559ee03319e8 [ 116.274425][ T641] R13: 0000000000000000 R14: 0000559ee03319e8 R15: 00007ffe00c3b528 [ 116.274622][ T641]