[ 25.412781][ T250] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 44.451209][ T341] ip (341) used greatest stack depth: 23792 bytes left [ 112.139183][ T641] [ 112.139274][ T641] ====================================================== [ 112.139434][ T641] WARNING: possible circular locking dependency detected [ 112.139589][ T641] 6.12.0-rc5-virtme #1 Not tainted [ 112.139715][ T641] ------------------------------------------------------ [ 112.139872][ T641] modprobe/641 is trying to acquire lock: [ 112.139999][ T641] ffffffffc0242420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 112.140229][ T641] [ 112.140229][ T641] but task is already holding lock: [ 112.140423][ T641] ffffffff859d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 112.140647][ T641] [ 112.140647][ T641] which lock already depends on the new lock. [ 112.140647][ T641] [ 112.140888][ T641] [ 112.140888][ T641] the existing dependency chain (in reverse order) is: [ 112.141104][ T641] [ 112.141104][ T641] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 112.141299][ T641] __lock_acquire+0xb3f/0x1580 [ 112.141427][ T641] lock_acquire.part.0+0xeb/0x330 [ 112.141551][ T641] __mutex_lock+0x149/0xac0 [ 112.141679][ T641] rtnl_newlink+0x64b/0xa30 [ 112.141818][ T641] rtnetlink_rcv_msg+0x712/0xc10 [ 112.141939][ T641] netlink_rcv_skb+0x130/0x360 [ 112.142065][ T641] netlink_unicast+0x44b/0x710 [ 112.142188][ T641] netlink_sendmsg+0x723/0xbe0 [ 112.142314][ T641] ____sys_sendmsg+0x7ac/0xa10 [ 112.142441][ T641] ___sys_sendmsg+0xee/0x170 [ 112.142568][ T641] __sys_sendmsg+0xcd/0x170 [ 112.142694][ T641] do_syscall_64+0xc1/0x1d0 [ 112.142820][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.142978][ T641] [ 112.142978][ T641] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 112.143175][ T641] check_prev_add+0x182/0xce0 [ 112.143299][ T641] validate_chain+0x71d/0x9b0 [ 112.143421][ T641] __lock_acquire+0xb3f/0x1580 [ 112.143544][ T641] lock_sync+0xd7/0x180 [ 112.143666][ T641] __synchronize_srcu+0x9e/0x2b0 [ 112.143787][ T641] __rtnl_link_unregister+0x14a/0x380 [ 112.143956][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 112.144084][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 112.144250][ T641] __do_sys_delete_module+0x2bd/0x470 [ 112.144406][ T641] do_syscall_64+0xc1/0x1d0 [ 112.144530][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.144685][ T641] [ 112.144685][ T641] other info that might help us debug this: [ 112.144685][ T641] [ 112.144922][ T641] Possible unsafe locking scenario: [ 112.144922][ T641] [ 112.145103][ T641] CPU0 CPU1 [ 112.145228][ T641] ---- ---- [ 112.145350][ T641] lock(rtnl_mutex); [ 112.145460][ T641] lock(&ops->srcu); [ 112.145611][ T641] lock(rtnl_mutex); [ 112.145761][ T641] sync(&ops->srcu); [ 112.145855][ T641] [ 112.145855][ T641] *** DEADLOCK *** [ 112.145855][ T641] [ 112.146028][ T641] 2 locks held by modprobe/641: [ 112.146148][ T641] #0: ffffffff859b8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 112.146397][ T641] #1: ffffffff859d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 112.146612][ T641] [ 112.146612][ T641] stack backtrace: [ 112.146762][ T641] CPU: 2 UID: 0 PID: 641 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 112.146943][ T641] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 112.147209][ T641] Call Trace: [ 112.147327][ T641] [ 112.147392][ T641] dump_stack_lvl+0x82/0xd0 [ 112.147521][ T641] print_circular_bug+0x2e2/0x4b0 [ 112.147647][ T641] check_noncircular+0x2f9/0x3e0 [ 112.147771][ T641] ? __pfx_check_noncircular+0x10/0x10 [ 112.147897][ T641] ? __kernel_text_address+0x12/0x40 [ 112.148025][ T641] ? unwind_get_return_address+0x5e/0xa0 [ 112.148152][ T641] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 112.148310][ T641] ? arch_stack_walk+0xa2/0xf0 [ 112.148450][ T641] ? alloc_chain_hlocks+0x4e0/0x720 [ 112.148577][ T641] check_prev_add+0x182/0xce0 [ 112.148701][ T641] ? __pfx_stack_trace_save+0x10/0x10 [ 112.148826][ T641] validate_chain+0x71d/0x9b0 [ 112.148954][ T641] ? __pfx_validate_chain+0x10/0x10 [ 112.149078][ T641] ? mark_lock+0x335/0x3e0 [ 112.149202][ T641] ? __pfx_validate_chain+0x10/0x10 [ 112.149329][ T641] __lock_acquire+0xb3f/0x1580 [ 112.149458][ T641] lock_sync+0xd7/0x180 [ 112.149552][ T641] ? __synchronize_srcu+0x21/0x2b0 [ 112.149676][ T641] __synchronize_srcu+0x9e/0x2b0 [ 112.149799][ T641] ? __pfx___synchronize_srcu+0x10/0x10 [ 112.149924][ T641] ? hlock_class+0x4e/0x130 [ 112.150050][ T641] ? mark_lock+0x38/0x3e0 [ 112.150145][ T641] ? kvm_clock_get_cycles+0x18/0x30 [ 112.150270][ T641] ? ktime_get_mono_fast_ns+0x84/0x360 [ 112.150398][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 112.150557][ T641] __rtnl_link_unregister+0x14a/0x380 [ 112.150680][ T641] ? mark_lock+0x38/0x3e0 [ 112.150783][ T641] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 112.150935][ T641] ? mark_held_locks+0x9e/0xe0 [ 112.151061][ T641] rtnl_link_unregister+0x14c/0x1c0 [ 112.151183][ T641] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 112.151308][ T641] ? __pfx_woken_wake_function+0x10/0x10 [ 112.151431][ T641] nsim_module_exit+0x10/0x1a [netdevsim] [ 112.151563][ T641] __do_sys_delete_module+0x2bd/0x470 [ 112.151684][ T641] ? __pfx___do_sys_delete_module+0x10/0x10 [ 112.151834][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.152005][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.152161][ T641] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 112.152290][ T641] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 112.152443][ T641] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 112.152601][ T641] do_syscall_64+0xc1/0x1d0 [ 112.152728][ T641] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 112.152883][ T641] RIP: 0033:0x7fa3fa4705ab [ 112.153013][ 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 [ 112.153461][ T641] RSP: 002b:00007ffe82538cd8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 112.153650][ T641] RAX: ffffffffffffffda RBX: 000055de67f69980 RCX: 00007fa3fa4705ab [ 112.153838][ T641] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 000055de67f699e8 [ 112.154025][ T641] RBP: 000055de67f69980 R08: 0000000000000000 R09: 0000000000000000 [ 112.154215][ T641] R10: 00007fa3fa5cfac0 R11: 0000000000000206 R12: 000055de67f699e8 [ 112.154401][ T641] R13: 0000000000000000 R14: 000055de67f699e8 R15: 00007ffe8253b008 [ 112.154592][ T641]