[ 25.979336][ T253] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 29.783734][ T253] (udev-worker) (253) used greatest stack depth: 23680 bytes left [ 119.636444][ T639] [ 119.636630][ T639] ====================================================== [ 119.636863][ T639] WARNING: possible circular locking dependency detected [ 119.637097][ T639] 6.12.0-rc5-virtme #1 Not tainted [ 119.637299][ T639] ------------------------------------------------------ [ 119.637531][ T639] modprobe/639 is trying to acquire lock: [ 119.637720][ T639] ffffffffc0308420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 119.638074][ T639] [ 119.638074][ T639] but task is already holding lock: [ 119.638359][ T639] ffffffffa3bd3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 119.638709][ T639] [ 119.638709][ T639] which lock already depends on the new lock. [ 119.638709][ T639] [ 119.639099][ T639] [ 119.639099][ T639] the existing dependency chain (in reverse order) is: [ 119.639437][ T639] [ 119.639437][ T639] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 119.639738][ T639] __lock_acquire+0xb3f/0x1580 [ 119.639978][ T639] lock_acquire.part.0+0xeb/0x330 [ 119.640193][ T639] __mutex_lock+0x149/0xac0 [ 119.640406][ T639] rtnl_newlink+0x64b/0xa30 [ 119.640616][ T639] rtnetlink_rcv_msg+0x712/0xc10 [ 119.640824][ T639] netlink_rcv_skb+0x130/0x360 [ 119.641031][ T639] netlink_unicast+0x44b/0x710 [ 119.641238][ T639] netlink_sendmsg+0x723/0xbe0 [ 119.641436][ T639] ____sys_sendmsg+0x7ac/0xa10 [ 119.641642][ T639] ___sys_sendmsg+0xee/0x170 [ 119.641855][ T639] __sys_sendmsg+0xcd/0x170 [ 119.642058][ T639] do_syscall_64+0xc1/0x1d0 [ 119.642262][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 119.642525][ T639] [ 119.642525][ T639] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 119.642839][ T639] check_prev_add+0x182/0xce0 [ 119.643055][ T639] validate_chain+0x71d/0x9b0 [ 119.643262][ T639] __lock_acquire+0xb3f/0x1580 [ 119.643454][ T639] lock_sync+0xd7/0x180 [ 119.643652][ T639] __synchronize_srcu+0x9e/0x2b0 [ 119.643854][ T639] __rtnl_link_unregister+0x14a/0x380 [ 119.644107][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 119.644312][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 119.644594][ T639] __do_sys_delete_module+0x2bd/0x470 [ 119.644851][ T639] do_syscall_64+0xc1/0x1d0 [ 119.645155][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 119.645424][ T639] [ 119.645424][ T639] other info that might help us debug this: [ 119.645424][ T639] [ 119.645828][ T639] Possible unsafe locking scenario: [ 119.645828][ T639] [ 119.646136][ T639] CPU0 CPU1 [ 119.646351][ T639] ---- ---- [ 119.646557][ T639] lock(rtnl_mutex); [ 119.646723][ T639] lock(&ops->srcu); [ 119.646997][ T639] lock(rtnl_mutex); [ 119.647209][ T639] sync(&ops->srcu); [ 119.647346][ T639] [ 119.647346][ T639] *** DEADLOCK *** [ 119.647346][ T639] [ 119.647608][ T639] 2 locks held by modprobe/639: [ 119.647802][ T639] #0: ffffffffa3bb8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 119.648204][ T639] #1: ffffffffa3bd3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 119.648542][ T639] [ 119.648542][ T639] stack backtrace: [ 119.648781][ T639] CPU: 2 UID: 0 PID: 639 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 119.649069][ T639] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 119.649489][ T639] Call Trace: [ 119.649668][ T639] [ 119.649772][ T639] dump_stack_lvl+0x82/0xd0 [ 119.649976][ T639] print_circular_bug+0x2e2/0x4b0 [ 119.650174][ T639] check_noncircular+0x2f9/0x3e0 [ 119.650373][ T639] ? __pfx_check_noncircular+0x10/0x10 [ 119.650581][ T639] ? __kernel_text_address+0x12/0x40 [ 119.650784][ T639] ? unwind_get_return_address+0x5e/0xa0 [ 119.650989][ T639] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 119.651234][ T639] ? arch_stack_walk+0xa2/0xf0 [ 119.651447][ T639] ? alloc_chain_hlocks+0x4e0/0x720 [ 119.651647][ T639] check_prev_add+0x182/0xce0 [ 119.651843][ T639] ? __pfx_stack_trace_save+0x10/0x10 [ 119.652055][ T639] validate_chain+0x71d/0x9b0 [ 119.652255][ T639] ? __pfx_validate_chain+0x10/0x10 [ 119.652438][ T639] ? mark_lock+0x335/0x3e0 [ 119.652626][ T639] ? __pfx_validate_chain+0x10/0x10 [ 119.652815][ T639] __lock_acquire+0xb3f/0x1580 [ 119.653027][ T639] lock_sync+0xd7/0x180 [ 119.653168][ T639] ? __synchronize_srcu+0x21/0x2b0 [ 119.653354][ T639] __synchronize_srcu+0x9e/0x2b0 [ 119.653540][ T639] ? __pfx___synchronize_srcu+0x10/0x10 [ 119.653729][ T639] ? hlock_class+0x4e/0x130 [ 119.653928][ T639] ? mark_lock+0x38/0x3e0 [ 119.654073][ T639] ? kvm_clock_get_cycles+0x18/0x30 [ 119.654267][ T639] ? ktime_get_mono_fast_ns+0x84/0x360 [ 119.654467][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 119.654718][ T639] __rtnl_link_unregister+0x14a/0x380 [ 119.654912][ T639] ? mark_lock+0x38/0x3e0 [ 119.655057][ T639] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 119.655306][ T639] ? mark_held_locks+0x9e/0xe0 [ 119.655500][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 119.655695][ T639] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 119.655892][ T639] ? __pfx_woken_wake_function+0x10/0x10 [ 119.656090][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 119.656305][ T639] __do_sys_delete_module+0x2bd/0x470 [ 119.656523][ T639] ? __pfx___do_sys_delete_module+0x10/0x10 [ 119.656786][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 119.657060][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 119.657327][ T639] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 119.657554][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 119.657817][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 119.658083][ T639] do_syscall_64+0xc1/0x1d0 [ 119.658316][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 119.658578][ T639] RIP: 0033:0x7fc878f465ab [ 119.658768][ 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 [ 119.659450][ T639] RSP: 002b:00007fff04ee5018 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 119.659748][ T639] RAX: ffffffffffffffda RBX: 000055ed71040980 RCX: 00007fc878f465ab [ 119.660041][ T639] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055ed710409e8 [ 119.660322][ T639] RBP: 000055ed71040980 R08: 0000000000000000 R09: 0000000000000000 [ 119.660609][ T639] R10: 00007fc8790a5ac0 R11: 0000000000000206 R12: 000055ed710409e8 [ 119.660899][ T639] R13: 0000000000000000 R14: 000055ed710409e8 R15: 00007fff04ee7348 [ 119.661200][ T639]