[ 25.285150][ T250] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 110.467225][ T641] [ 110.467349][ T641] ====================================================== [ 110.467548][ T641] WARNING: possible circular locking dependency detected [ 110.467758][ T641] 6.12.0-rc5-virtme #1 Not tainted [ 110.467913][ T641] ------------------------------------------------------ [ 110.468102][ T641] modprobe/641 is trying to acquire lock: [ 110.468271][ T641] ffffffffc024e420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 110.468557][ T641] [ 110.468557][ T641] but task is already holding lock: [ 110.468816][ T641] ffffffffad9d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 110.469097][ T641] [ 110.469097][ T641] which lock already depends on the new lock. [ 110.469097][ T641] [ 110.469411][ T641] [ 110.469411][ T641] the existing dependency chain (in reverse order) is: [ 110.469690][ T641] [ 110.469690][ T641] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 110.469940][ T641] __lock_acquire+0xb3f/0x1580 [ 110.470116][ T641] lock_acquire.part.0+0xeb/0x330 [ 110.470273][ T641] __mutex_lock+0x149/0xac0 [ 110.470448][ T641] rtnl_newlink+0x64b/0xa30 [ 110.470607][ T641] rtnetlink_rcv_msg+0x712/0xc10 [ 110.470768][ T641] netlink_rcv_skb+0x130/0x360 [ 110.470932][ T641] netlink_unicast+0x44b/0x710 [ 110.471096][ T641] netlink_sendmsg+0x723/0xbe0 [ 110.471250][ T641] ____sys_sendmsg+0x7ac/0xa10 [ 110.471403][ T641] ___sys_sendmsg+0xee/0x170 [ 110.471567][ T641] __sys_sendmsg+0xcd/0x170 [ 110.471723][ T641] do_syscall_64+0xc1/0x1d0 [ 110.471881][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 110.472079][ T641] [ 110.472079][ T641] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 110.472319][ T641] check_prev_add+0x182/0xce0 [ 110.472474][ T641] validate_chain+0x71d/0x9b0 [ 110.472670][ T641] __lock_acquire+0xb3f/0x1580 [ 110.472821][ T641] lock_sync+0xd7/0x180 [ 110.472975][ T641] __synchronize_srcu+0x9e/0x2b0 [ 110.473126][ T641] __rtnl_link_unregister+0x14a/0x380 [ 110.473316][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 110.473471][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 110.473680][ T641] __do_sys_delete_module+0x2bd/0x470 [ 110.473877][ T641] do_syscall_64+0xc1/0x1d0 [ 110.474031][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 110.474222][ T641] [ 110.474222][ T641] other info that might help us debug this: [ 110.474222][ T641] [ 110.474516][ T641] Possible unsafe locking scenario: [ 110.474516][ T641] [ 110.474743][ T641] CPU0 CPU1 [ 110.474897][ T641] ---- ---- [ 110.475049][ T641] lock(rtnl_mutex); [ 110.475169][ T641] lock(&ops->srcu); [ 110.475359][ T641] lock(rtnl_mutex); [ 110.475546][ T641] sync(&ops->srcu); [ 110.475663][ T641] [ 110.475663][ T641] *** DEADLOCK *** [ 110.475663][ T641] [ 110.475883][ T641] 2 locks held by modprobe/641: [ 110.476035][ T641] #0: ffffffffad9b8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 110.476345][ T641] #1: ffffffffad9d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 110.476615][ T641] [ 110.476615][ T641] stack backtrace: [ 110.476802][ T641] CPU: 1 UID: 0 PID: 641 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 110.477042][ T641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 110.477392][ T641] Call Trace: [ 110.477530][ T641] [ 110.477615][ T641] dump_stack_lvl+0x82/0xd0 [ 110.477787][ T641] print_circular_bug+0x2e2/0x4b0 [ 110.477947][ T641] check_noncircular+0x2f9/0x3e0 [ 110.478118][ T641] ? __pfx_check_noncircular+0x10/0x10 [ 110.478294][ T641] ? __kernel_text_address+0x12/0x40 [ 110.478450][ T641] ? unwind_get_return_address+0x5e/0xa0 [ 110.478611][ T641] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 110.478825][ T641] ? arch_stack_walk+0xa2/0xf0 [ 110.478984][ T641] ? alloc_chain_hlocks+0x4e0/0x720 [ 110.479154][ T641] check_prev_add+0x182/0xce0 [ 110.479307][ T641] ? __pfx_stack_trace_save+0x10/0x10 [ 110.479473][ T641] validate_chain+0x71d/0x9b0 [ 110.479626][ T641] ? __pfx_validate_chain+0x10/0x10 [ 110.479786][ T641] ? mark_lock+0x335/0x3e0 [ 110.479940][ T641] ? __pfx_validate_chain+0x10/0x10 [ 110.480114][ T641] __lock_acquire+0xb3f/0x1580 [ 110.480289][ T641] lock_sync+0xd7/0x180 [ 110.480414][ T641] ? __synchronize_srcu+0x21/0x2b0 [ 110.480566][ T641] __synchronize_srcu+0x9e/0x2b0 [ 110.480738][ T641] ? __pfx___synchronize_srcu+0x10/0x10 [ 110.480890][ T641] ? hlock_class+0x4e/0x130 [ 110.481056][ T641] ? mark_lock+0x38/0x3e0 [ 110.481172][ T641] ? kvm_clock_get_cycles+0x18/0x30 [ 110.481348][ T641] ? ktime_get_mono_fast_ns+0x84/0x360 [ 110.481507][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 110.481711][ T641] __rtnl_link_unregister+0x14a/0x380 [ 110.481866][ T641] ? mark_lock+0x38/0x3e0 [ 110.481996][ T641] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 110.482193][ T641] ? mark_held_locks+0x9e/0xe0 [ 110.482350][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 110.482516][ T641] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 110.482676][ T641] ? __pfx_woken_wake_function+0x10/0x10 [ 110.482861][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 110.483037][ T641] __do_sys_delete_module+0x2bd/0x470 [ 110.483199][ T641] ? __pfx___do_sys_delete_module+0x10/0x10 [ 110.483397][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 110.483587][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 110.483795][ T641] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 110.483962][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 110.484150][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 110.484356][ T641] do_syscall_64+0xc1/0x1d0 [ 110.484512][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 110.484719][ T641] RIP: 0033:0x7f68e70f45ab [ 110.484893][ 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 [ 110.485473][ T641] RSP: 002b:00007fff88e840c8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 110.485705][ T641] RAX: ffffffffffffffda RBX: 00005569412f0980 RCX: 00007f68e70f45ab [ 110.485949][ T641] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 00005569412f09e8 [ 110.486193][ T641] RBP: 00005569412f0980 R08: 0000000000000000 R09: 0000000000000000 [ 110.486432][ T641] R10: 00007f68e7253ac0 R11: 0000000000000206 R12: 00005569412f09e8 [ 110.486662][ T641] R13: 0000000000000000 R14: 00005569412f09e8 R15: 00007fff88e863f8 [ 110.486907][ T641]