[ 25.627459][ T254] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 26.861147][ T267] ip (267) used greatest stack depth: 24144 bytes left [ 29.405021][ T294] ip (294) used greatest stack depth: 23912 bytes left [ 57.879008][ T604] Failed to register fib notifier [ 59.356875][ T623] ip (623) used greatest stack depth: 23240 bytes left [ 120.849776][ T1193] Failed to register fib notifier [ 155.610348][ T1561] Failed to register fib notifier [ 213.367552][ T2150] Failed to register fib notifier [ 215.443083][ T2181] [ 215.443175][ T2181] ====================================================== [ 215.443334][ T2181] WARNING: possible circular locking dependency detected [ 215.443488][ T2181] 6.12.0-rc5-virtme #1 Not tainted [ 215.443614][ T2181] ------------------------------------------------------ [ 215.443785][ T2181] modprobe/2181 is trying to acquire lock: [ 215.443947][ T2181] ffffffffc05b5420 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 215.444182][ T2181] [ 215.444182][ T2181] but task is already holding lock: [ 215.444368][ T2181] ffffffffa99d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 215.444600][ T2181] [ 215.444600][ T2181] which lock already depends on the new lock. [ 215.444600][ T2181] [ 215.444855][ T2181] [ 215.444855][ T2181] the existing dependency chain (in reverse order) is: [ 215.445073][ T2181] [ 215.445073][ T2181] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 215.445264][ T2181] __lock_acquire+0xb3f/0x1580 [ 215.445393][ T2181] lock_acquire.part.0+0xeb/0x330 [ 215.445519][ T2181] __mutex_lock+0x149/0xac0 [ 215.445651][ T2181] rtnl_newlink+0x64b/0xa30 [ 215.445782][ T2181] rtnetlink_rcv_msg+0x712/0xc10 [ 215.445915][ T2181] netlink_rcv_skb+0x130/0x360 [ 215.446045][ T2181] netlink_unicast+0x44b/0x710 [ 215.446172][ T2181] netlink_sendmsg+0x723/0xbe0 [ 215.446304][ T2181] ____sys_sendmsg+0x7ac/0xa10 [ 215.446436][ T2181] ___sys_sendmsg+0xee/0x170 [ 215.446565][ T2181] __sys_sendmsg+0xcd/0x170 [ 215.446695][ T2181] do_syscall_64+0xc1/0x1d0 [ 215.446829][ T2181] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 215.446997][ T2181] [ 215.446997][ T2181] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 215.447192][ T2181] check_prev_add+0x182/0xce0 [ 215.447324][ T2181] validate_chain+0x71d/0x9b0 [ 215.447452][ T2181] __lock_acquire+0xb3f/0x1580 [ 215.447580][ T2181] lock_sync+0xd7/0x180 [ 215.447710][ T2181] __synchronize_srcu+0x9e/0x2b0 [ 215.447835][ T2181] __rtnl_link_unregister+0x14a/0x380 [ 215.447993][ T2181] rtnl_link_unregister+0x14c/0x1c0 [ 215.448120][ T2181] nsim_module_exit+0x10/0x1a [netdevsim] [ 215.448290][ T2181] __do_sys_delete_module+0x2bd/0x470 [ 215.448447][ T2181] do_syscall_64+0xc1/0x1d0 [ 215.448576][ T2181] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 215.448732][ T2181] [ 215.448732][ T2181] other info that might help us debug this: [ 215.448732][ T2181] [ 215.448970][ T2181] Possible unsafe locking scenario: [ 215.448970][ T2181] [ 215.449152][ T2181] CPU0 CPU1 [ 215.449277][ T2181] ---- ---- [ 215.449399][ T2181] lock(rtnl_mutex); [ 215.449497][ T2181] lock(&ops->srcu); [ 215.449654][ T2181] lock(rtnl_mutex); [ 215.449812][ T2181] sync(&ops->srcu); [ 215.449907][ T2181] [ 215.449907][ T2181] *** DEADLOCK *** [ 215.449907][ T2181] [ 215.450086][ T2181] 2 locks held by modprobe/2181: [ 215.450208][ T2181] #0: ffffffffa99b8650 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 215.450465][ T2181] #1: ffffffffa99d3948 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 215.450685][ T2181] [ 215.450685][ T2181] stack backtrace: [ 215.450841][ T2181] CPU: 3 UID: 0 PID: 2181 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 215.451029][ T2181] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 215.451305][ T2181] Call Trace: [ 215.451416][ T2181] [ 215.451482][ T2181] dump_stack_lvl+0x82/0xd0 [ 215.451611][ T2181] print_circular_bug+0x2e2/0x4b0 [ 215.451734][ T2181] check_noncircular+0x2f9/0x3e0 [ 215.451862][ T2181] ? __pfx_check_noncircular+0x10/0x10 [ 215.451993][ T2181] ? __kernel_text_address+0x12/0x40 [ 215.452122][ T2181] ? unwind_get_return_address+0x5e/0xa0 [ 215.452248][ T2181] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 215.452416][ T2181] ? arch_stack_walk+0xa2/0xf0 [ 215.452547][ T2181] ? alloc_chain_hlocks+0x4e0/0x720 [ 215.452683][ T2181] check_prev_add+0x182/0xce0 [ 215.452808][ T2181] ? __pfx_stack_trace_save+0x10/0x10 [ 215.452936][ T2181] validate_chain+0x71d/0x9b0 [ 215.453067][ T2181] ? __pfx_validate_chain+0x10/0x10 [ 215.453193][ T2181] ? mark_lock+0x335/0x3e0 [ 215.453318][ T2181] ? __pfx_validate_chain+0x10/0x10 [ 215.453447][ T2181] __lock_acquire+0xb3f/0x1580 [ 215.453591][ T2181] lock_sync+0xd7/0x180 [ 215.453687][ T2181] ? __synchronize_srcu+0x21/0x2b0 [ 215.453816][ T2181] __synchronize_srcu+0x9e/0x2b0 [ 215.453944][ T2181] ? __pfx___synchronize_srcu+0x10/0x10 [ 215.454071][ T2181] ? hlock_class+0x4e/0x130 [ 215.454199][ T2181] ? mark_lock+0x38/0x3e0 [ 215.454301][ T2181] ? kvm_clock_get_cycles+0x18/0x30 [ 215.454432][ T2181] ? ktime_get_mono_fast_ns+0x84/0x360 [ 215.454563][ T2181] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 215.454733][ T2181] __rtnl_link_unregister+0x14a/0x380 [ 215.454860][ T2181] ? mark_lock+0x38/0x3e0 [ 215.454958][ T2181] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 215.455115][ T2181] ? mark_held_locks+0x9e/0xe0 [ 215.455245][ T2181] rtnl_link_unregister+0x14c/0x1c0 [ 215.455375][ T2181] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 215.455509][ T2181] ? __pfx_woken_wake_function+0x10/0x10 [ 215.455636][ T2181] nsim_module_exit+0x10/0x1a [netdevsim] [ 215.455774][ T2181] __do_sys_delete_module+0x2bd/0x470 [ 215.455901][ T2181] ? __pfx___do_sys_delete_module+0x10/0x10 [ 215.456143][ T2181] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 215.456301][ T2181] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 215.456461][ T2181] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 215.456596][ T2181] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 215.456762][ T2181] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 215.457012][ T2181] do_syscall_64+0xc1/0x1d0 [ 215.457140][ T2181] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 215.457296][ T2181] RIP: 0033:0x7f6973fb45ab [ 215.457425][ T2181] 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 [ 215.457940][ T2181] RSP: 002b:00007fffa5c9b2e8 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 215.458129][ T2181] RAX: ffffffffffffffda RBX: 00005588bb025980 RCX: 00007f6973fb45ab [ 215.458388][ T2181] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 00005588bb0259e8 [ 215.458575][ T2181] RBP: 00005588bb025980 R08: 0000000000000000 R09: 0000000000000000 [ 215.458764][ T2181] R10: 00007f6974113ac0 R11: 0000000000000206 R12: 00005588bb0259e8 [ 215.458954][ T2181] R13: 0000000000000000 R14: 00005588bb0259e8 R15: 00007fffa5c9d618 [ 215.459146][ T2181]