[ 12.541132][ T252] [ 12.541255][ T252] ============================================ [ 12.541463][ T252] WARNING: possible recursive locking detected [ 12.541666][ T252] 6.13.0-rc5-virtme #1 Not tainted [ 12.541832][ T252] -------------------------------------------- [ 12.542056][ T252] python3/252 is trying to acquire lock: [ 12.542217][ T252] ffffffff975f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 12.542565][ T252] [ 12.542565][ T252] but task is already holding lock: [ 12.542823][ T252] ffffffff975f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 12.543174][ T252] [ 12.543174][ T252] other info that might help us debug this: [ 12.543412][ T252] Possible unsafe locking scenario: [ 12.543412][ T252] [ 12.543672][ T252] CPU0 [ 12.543797][ T252] ---- [ 12.543917][ T252] lock((netdev_chain).rwsem); [ 12.544081][ T252] lock((netdev_chain).rwsem); [ 12.544267][ T252] [ 12.544267][ T252] *** DEADLOCK *** [ 12.544267][ T252] [ 12.544505][ T252] May be due to missing lock nesting notation [ 12.544505][ T252] [ 12.544754][ T252] 8 locks held by python3/252: [ 12.544916][ T252] #0: ffff88800b01c3f0 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0xf8/0x1d0 [ 12.545217][ T252] #1: ffff88800b7c5688 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x20b/0x460 [ 12.545506][ T252] #2: ffff88800986f570 (kn->active#33){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22e/0x460 [ 12.545834][ T252] #3: ffffffffc045d628 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x12a/0x690 [netdevsim] [ 12.546278][ T252] #4: ffff88800b5f08e8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x76/0x3f0 [ 12.546575][ T252] #5: ffff88800b5f2250 (&devlink->lock_key){+.+.}-{4:4}, at: nsim_drv_probe+0xb7/0x8b0 [netdevsim] [ 12.546931][ T252] #6: ffffffff97607e88 (rtnl_mutex){+.+.}-{4:4}, at: nsim_create+0x46a/0xa60 [netdevsim] [ 12.547247][ T252] #7: ffffffff975f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90 [ 12.547599][ T252] [ 12.547599][ T252] stack backtrace: [ 12.547801][ T252] CPU: 0 UID: 0 PID: 252 Comm: python3 Not tainted 6.13.0-rc5-virtme #1 [ 12.548072][ T252] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 12.548275][ T252] Call Trace: [ 12.548402][ T252] [ 12.548487][ T252] dump_stack_lvl+0x82/0xd0 [ 12.548668][ T252] print_deadlock_bug+0x40a/0x650 [ 12.548846][ T252] validate_chain+0x5bf/0xae0 [ 12.549011][ T252] ? __pfx_validate_chain+0x10/0x10 [ 12.549194][ T252] ? hlock_class+0x4e/0x130 [ 12.549358][ T252] ? mark_lock+0x38/0x3e0 [ 12.549482][ T252] __lock_acquire+0xb9a/0x1680 [ 12.549644][ T252] ? udp_tunnel_nic_netdevice_event+0xd1/0x5c0 [ 12.549849][ T252] ? really_probe+0x1df/0x920 [ 12.550013][ T252] lock_acquire.part.0+0xeb/0x330 [ 12.550202][ T252] ? blocking_notifier_call_chain+0x50/0x90 [ 12.550413][ T252] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.550624][ T252] ? find_held_lock+0x2c/0x110 [ 12.550787][ T252] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.550963][ T252] ? trace_lock_acquire+0x14c/0x1f0 [ 12.551125][ T252] ? lock_acquire+0x32/0xc0 [ 12.551288][ T252] ? blocking_notifier_call_chain+0x50/0x90 [ 12.551495][ T252] down_read+0x9f/0x340 [ 12.551631][ T252] ? blocking_notifier_call_chain+0x50/0x90 [ 12.551833][ T252] ? __pfx_down_read+0x10/0x10 [ 12.552003][ T252] ? notifier_call_chain+0xcd/0x150 [ 12.552172][ T252] blocking_notifier_call_chain+0x50/0x90 [ 12.552335][ T252] call_netdevice_notifiers+0x71/0xa0 [ 12.552501][ T252] ? __pfx_call_netdevice_notifiers+0x10/0x10 [ 12.552705][ T252] ? mutex_is_locked+0x1c/0x60 [ 12.552878][ T252] udp_tunnel_nic_register+0x591/0x870 [ 12.553041][ T252] udp_tunnel_nic_netdevice_event+0x11d/0x5c0 [ 12.553251][ T252] notifier_call_chain+0xcd/0x150 [ 12.553434][ T252] blocking_notifier_call_chain+0x66/0x90 [ 12.553596][ T252] register_netdevice+0xe75/0x1360 [ 12.553763][ T252] ? __pfx_register_netdevice+0x10/0x10 [ 12.553930][ T252] nsim_create+0x6c2/0xa60 [netdevsim] [ 12.554106][ T252] __nsim_dev_port_add+0x22f/0x6e0 [netdevsim] [ 12.554318][ T252] ? mark_lock+0x38/0x3e0 [ 12.554441][ T252] ? __pfx___nsim_dev_port_add+0x10/0x10 [netdevsim] [ 12.554655][ T252] ? lockdep_hardirqs_on_prepare+0x275/0x410 [ 12.554863][ T252] nsim_dev_port_add_all+0x39/0xf0 [netdevsim] [ 12.555074][ T252] nsim_drv_probe+0x61e/0x8b0 [netdevsim] [ 12.555247][ T252] ? __pfx_nsim_drv_probe+0x10/0x10 [netdevsim] [ 12.555458][ T252] ? kernfs_create_link+0x173/0x240 [ 12.555629][ T252] ? kernfs_put+0x1c/0x40 [ 12.555754][ T252] ? sysfs_do_create_link_sd+0x8c/0x100 [ 12.555934][ T252] really_probe+0x1df/0x920 [ 12.556109][ T252] __driver_probe_device+0x2e6/0x3e0 [ 12.556280][ T252] driver_probe_device+0x49/0x140 [ 12.556447][ T252] __device_attach_driver+0x192/0x2b0 [ 12.556612][ T252] ? __pfx___device_attach_driver+0x10/0x10 [ 12.556823][ T252] bus_for_each_drv+0x107/0x1a0 [ 12.556987][ T252] ? __pfx_bus_for_each_drv+0x10/0x10 [ 12.557149][ T252] ? bus_to_subsys+0xd5/0x110 [ 12.557316][ T252] ? __pfx___lock_release+0x10/0x10 [ 12.557484][ T252] ? __pfx_lock_acquire.part.0+0x10/0x10 [ 12.557653][ T252] __device_attach+0x1a3/0x3f0 [ 12.557821][ T252] ? __pfx___device_attach+0x10/0x10 [ 12.557991][ T252] ? bus_to_subsys+0xd5/0x110 [ 12.558159][ T252] ? do_raw_spin_unlock+0x58/0x220 [ 12.558325][ T252] bus_probe_device+0x133/0x180 [ 12.558492][ T252] device_add+0x99d/0x1110 [ 12.558658][ T252] ? __pfx_device_add+0x10/0x10 [ 12.558820][ T252] ? __init_waitqueue_head+0xcf/0x150 [ 12.558985][ T252] new_device_store+0x393/0x690 [netdevsim] [ 12.559196][ T252] ? __pfx_new_device_store+0x10/0x10 [netdevsim] [ 12.559414][ T252] ? __pfx_sysfs_kf_write+0x10/0x10 [ 12.559575][ T252] ? sysfs_file_ops+0x11e/0x170 [ 12.559744][ T252] ? __pfx_sysfs_kf_write+0x10/0x10 [ 12.559906][ T252] kernfs_fop_write_iter+0x2ba/0x460 [ 12.560070][ T252] vfs_write+0xa81/0x11e0 [ 12.560194][ T252] ? __pfx_vfs_write+0x10/0x10 [ 12.560356][ T252] ? __lock_release+0x103/0x460 [ 12.560517][ T252] ? do_user_addr_fault+0x972/0xe30 [ 12.560682][ T252] ? __pfx___up_read+0x10/0x10 [ 12.560851][ T252] ksys_write+0xf8/0x1d0 [ 12.560974][ T252] ? __pfx_ksys_write+0x10/0x10 [ 12.561135][ T252] ? do_user_addr_fault+0x97c/0xe30 [ 12.561299][ T252] do_syscall_64+0xc1/0x1d0 [ 12.561463][ T252] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 12.561663][ T252] RIP: 0033:0x7fa003f84b77 [ 12.561832][ T252] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 [ 12.562423][ T252] RSP: 002b:00007ffd52399758 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 12.562671][ T252] RAX: ffffffffffffffda RBX: 00007fa003d6a140 RCX: 00007fa003f84b77 [ 12.562916][ T252] RDX: 0000000000000009 RSI: 000055f2070617e0 RDI: 0000000000000005 [ 12.563171][ T252] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000 [ 12.563420][ T252] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f9ff5bee040 [ 12.563672][ T252] R13: 000055f2070617e0 R14: 0000000000000005 R15: 000055f206bb2910 [ 12.563921][ T252] [ 12.629733][ T256] netdevsim netdevsim13730 eni13730np1: renamed from eth0 [ 20.157283][ T343] netdevsim netdevsim18862 eni18862np1: renamed from eth0 [ 42.266073][ T542] netdevsim netdevsim18862 eni18862np1: set_features() failed (-16); wanted 0x041c000080014869, left 0x041e000080014869 [ 44.307666][ T553] netdevsim netdevsim5238 eni5238np1: renamed from eth0 [ 53.404224][ T632] netdevsim netdevsim16174 eni16174np1: renamed from eth0 [ 71.049243][ T765] netdevsim netdevsim11721 eni11721np1: renamed from eth0 [ 82.729208][ T845] netdevsim netdevsim31510 eni31510np1: renamed from eth0 [ 92.981784][ T958] netdevsim netdevsim7988 eni7988np1: renamed from eth0 [ 103.057506][ T1052] netdevsim netdevsim21843 eni21843np1: renamed from eth0 [ 120.096024][ T1175] netdevsim netdevsim19280 eni19280np1: renamed from eth0 [ 135.150883][ T1259] netdevsim netdevsim26810 eni26810np1: renamed from eth0 [ 153.736946][ T1389] netdevsim netdevsim31655 eni31655np1: renamed from eth0 [ 162.094361][ T1466] netdevsim netdevsim13749 eni13749np1: renamed from eth0 [ 170.696833][ T1545] netdevsim netdevsim17150 eni17150np1: renamed from eth0 [ 178.975072][ T1621] netdevsim netdevsim16792 eni16792np1: renamed from eth0 [ 178.987050][ T1624] netdevsim netdevsim16792 eni16792np3: renamed from eth2 [ 179.108488][ T1623] netdevsim netdevsim16792 eni16792np2: renamed from eth1