[ 29.439489][ T251] netdevsim netdevsim1337 eni1337np1: renamed from eth0 [ 118.706568][ T639] [ 118.706683][ T639] ====================================================== [ 118.706868][ T639] WARNING: possible circular locking dependency detected [ 118.707047][ T639] 6.12.0-rc5-virtme #1 Not tainted [ 118.707193][ T639] ------------------------------------------------------ [ 118.707373][ T639] modprobe/639 is trying to acquire lock: [ 118.707517][ T639] ffffffffc02854e0 (&ops->srcu){.+.+}-{0:0}, at: __synchronize_srcu+0x21/0x2b0 [ 118.707777][ T639] [ 118.707777][ T639] but task is already holding lock: [ 118.707985][ T639] ffffffffa1fd3b88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 118.708243][ T639] [ 118.708243][ T639] which lock already depends on the new lock. [ 118.708243][ T639] [ 118.708521][ T639] [ 118.708521][ T639] the existing dependency chain (in reverse order) is: [ 118.708772][ T639] [ 118.708772][ T639] -> #1 (rtnl_mutex){+.+.}-{3:3}: [ 118.708995][ T639] __lock_acquire+0xb3f/0x1580 [ 118.709146][ T639] lock_acquire.part.0+0xeb/0x330 [ 118.709290][ T639] __mutex_lock+0x149/0xac0 [ 118.709434][ T639] rtnl_newlink+0x64f/0xa20 [ 118.709576][ T639] rtnetlink_rcv_msg+0x712/0xc10 [ 118.709723][ T639] netlink_rcv_skb+0x130/0x360 [ 118.709866][ T639] netlink_unicast+0x44b/0x710 [ 118.710009][ T639] netlink_sendmsg+0x723/0xbe0 [ 118.710153][ T639] ____sys_sendmsg+0x7ac/0xa10 [ 118.710305][ T639] ___sys_sendmsg+0xee/0x170 [ 118.710462][ T639] __sys_sendmsg+0xcd/0x170 [ 118.710617][ T639] do_syscall_64+0xc1/0x1d0 [ 118.710773][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 118.710970][ T639] [ 118.710970][ T639] -> #0 (&ops->srcu){.+.+}-{0:0}: [ 118.711201][ T639] check_prev_add+0x182/0xce0 [ 118.711359][ T639] validate_chain+0x71d/0x9b0 [ 118.711512][ T639] __lock_acquire+0xb3f/0x1580 [ 118.711670][ T639] lock_sync+0xd7/0x180 [ 118.711825][ T639] __synchronize_srcu+0x9e/0x2b0 [ 118.711981][ T639] __rtnl_link_unregister+0x14a/0x380 [ 118.712179][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 118.712339][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 118.712549][ T639] __do_sys_delete_module+0x2bd/0x470 [ 118.712743][ T639] do_syscall_64+0xc1/0x1d0 [ 118.712897][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 118.713091][ T639] [ 118.713091][ T639] other info that might help us debug this: [ 118.713091][ T639] [ 118.713396][ T639] Possible unsafe locking scenario: [ 118.713396][ T639] [ 118.713621][ T639] CPU0 CPU1 [ 118.713773][ T639] ---- ---- [ 118.713925][ T639] lock(rtnl_mutex); [ 118.714048][ T639] lock(&ops->srcu); [ 118.714238][ T639] lock(rtnl_mutex); [ 118.714422][ T639] sync(&ops->srcu); [ 118.714534][ T639] [ 118.714534][ T639] *** DEADLOCK *** [ 118.714534][ T639] [ 118.714744][ T639] 2 locks held by modprobe/639: [ 118.714889][ T639] #0: ffffffffa1fb8890 (pernet_ops_rwsem){++++}-{3:3}, at: rtnl_link_unregister+0xa6/0x1c0 [ 118.715174][ T639] #1: ffffffffa1fd3b88 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_link_unregister+0x10c/0x1c0 [ 118.715427][ T639] [ 118.715427][ T639] stack backtrace: [ 118.715614][ T639] CPU: 3 UID: 0 PID: 639 Comm: modprobe Not tainted 6.12.0-rc5-virtme #1 [ 118.715836][ T639] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014 [ 118.716167][ T639] Call Trace: [ 118.716289][ T639] [ 118.716372][ T639] dump_stack_lvl+0x82/0xd0 [ 118.716555][ T639] print_circular_bug+0x2e2/0x4b0 [ 118.716706][ T639] check_noncircular+0x2f9/0x3e0 [ 118.716868][ T639] ? __pfx_check_noncircular+0x10/0x10 [ 118.717023][ T639] ? __kernel_text_address+0x12/0x40 [ 118.717165][ T639] ? unwind_get_return_address+0x5e/0xa0 [ 118.717318][ T639] ? __pfx_stack_trace_consume_entry+0x10/0x10 [ 118.717501][ T639] ? arch_stack_walk+0xa2/0xf0 [ 118.717650][ T639] ? alloc_chain_hlocks+0x4e0/0x720 [ 118.717804][ T639] check_prev_add+0x182/0xce0 [ 118.717971][ T639] ? __pfx_stack_trace_save+0x10/0x10 [ 118.718130][ T639] validate_chain+0x71d/0x9b0 [ 118.718287][ T639] ? __pfx_validate_chain+0x10/0x10 [ 118.718442][ T639] ? mark_lock+0x335/0x3e0 [ 118.718602][ T639] ? __pfx_validate_chain+0x10/0x10 [ 118.718766][ T639] __lock_acquire+0xb3f/0x1580 [ 118.718929][ T639] lock_sync+0xd7/0x180 [ 118.719051][ T639] ? __synchronize_srcu+0x21/0x2b0 [ 118.719196][ T639] __synchronize_srcu+0x9e/0x2b0 [ 118.719357][ T639] ? __pfx___synchronize_srcu+0x10/0x10 [ 118.719522][ T639] ? hlock_class+0x4e/0x130 [ 118.719682][ T639] ? mark_lock+0x38/0x3e0 [ 118.719806][ T639] ? kvm_clock_get_cycles+0x18/0x30 [ 118.719966][ T639] ? ktime_get_mono_fast_ns+0x84/0x360 [ 118.720125][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 118.720326][ T639] __rtnl_link_unregister+0x14a/0x380 [ 118.720488][ T639] ? mark_lock+0x38/0x3e0 [ 118.720612][ T639] ? __pfx___rtnl_link_unregister+0x10/0x10 [ 118.720819][ T639] ? mark_held_locks+0x9e/0xe0 [ 118.720978][ T639] rtnl_link_unregister+0x14c/0x1c0 [ 118.721127][ T639] ? __pfx_rtnl_link_unregister+0x10/0x10 [ 118.721283][ T639] ? __pfx_woken_wake_function+0x10/0x10 [ 118.721454][ T639] nsim_module_exit+0x10/0x1a [netdevsim] [ 118.721703][ T639] __do_sys_delete_module+0x2bd/0x470 [ 118.721860][ T639] ? __pfx___do_sys_delete_module+0x10/0x10 [ 118.722038][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 118.722223][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 118.722490][ T639] ? trace_rcu_segcb_stats+0x37/0x1e0 [ 118.722632][ T639] ? __pfx_slab_free_after_rcu_debug+0x10/0x10 [ 118.722808][ T639] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 118.722995][ T639] do_syscall_64+0xc1/0x1d0 [ 118.723223][ T639] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 118.723412][ T639] RIP: 0033:0x7f66127205ab [ 118.723578][ 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 [ 118.724216][ T639] RSP: 002b:00007ffeb05fae78 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0 [ 118.724457][ T639] RAX: ffffffffffffffda RBX: 0000562d9fd6c980 RCX: 00007f66127205ab [ 118.724707][ T639] RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000562d9fd6c9e8 [ 118.724943][ T639] RBP: 0000562d9fd6c980 R08: 0000000000000000 R09: 0000000000000000 [ 118.725257][ T639] R10: 00007f661287fac0 R11: 0000000000000206 R12: 0000562d9fd6c9e8 [ 118.725472][ T639] R13: 0000000000000000 R14: 0000562d9fd6c9e8 R15: 00007ffeb05fd1a8 [ 118.725691][ T639]