[ 13.456671][ T286] ip (286) used greatest stack depth: 24320 bytes left
[ 13.580768][ T287]
[ 13.580952][ T287] ============================================
[ 13.581174][ T287] WARNING: possible recursive locking detected
[ 13.581391][ T287] 6.13.0-rc5-virtme #1 Not tainted
[ 13.581566][ T287] --------------------------------------------
[ 13.581776][ T287] echo/287 is trying to acquire lock:
[ 13.581947][ T287] ffffffffac5f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90
[ 13.582306][ T287]
[ 13.582306][ T287] but task is already holding lock:
[ 13.582554][ T287] ffffffffac5f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90
[ 13.582898][ T287]
[ 13.582898][ T287] other info that might help us debug this:
[ 13.583147][ T287] Possible unsafe locking scenario:
[ 13.583147][ T287]
[ 13.583397][ T287] CPU0
[ 13.583523][ T287] ----
[ 13.583649][ T287] lock((netdev_chain).rwsem);
[ 13.583820][ T287] lock((netdev_chain).rwsem);
[ 13.583993][ T287]
[ 13.583993][ T287] *** DEADLOCK ***
[ 13.583993][ T287]
[ 13.584241][ T287] May be due to missing lock nesting notation
[ 13.584241][ T287]
[ 13.584496][ T287] 8 locks held by echo/287:
[ 13.584671][ T287] #0: ffff88800a8d43f0 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0xf8/0x1d0
[ 13.584983][ T287] #1: ffff88800d1a3288 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x20b/0x460
[ 13.585293][ T287] #2: ffff888009bc2370 (kn->active#33){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x22e/0x460
[ 13.585650][ T287] #3: ffffffffc048d628 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x12a/0x690 [netdevsim]
[ 13.586053][ T287] #4: ffff88800563b8e8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x76/0x3f0
[ 13.586391][ T287] #5: ffff8880097b8a50 (&devlink->lock_key){+.+.}-{4:4}, at: nsim_drv_probe+0xb7/0x8b0 [netdevsim]
[ 13.586752][ T287] #6: ffffffffac607e88 (rtnl_mutex){+.+.}-{4:4}, at: nsim_create+0x46a/0xa60 [netdevsim]
[ 13.587070][ T287] #7: ffffffffac5f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain+0x50/0x90
[ 13.587442][ T287]
[ 13.587442][ T287] stack backtrace:
[ 13.587654][ T287] CPU: 2 UID: 0 PID: 287 Comm: echo Not tainted 6.13.0-rc5-virtme #1
[ 13.587907][ T287] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.588120][ T287] Call Trace:
[ 13.588251][ T287] <TASK>
[ 13.588340][ T287] dump_stack_lvl+0x82/0xd0
[ 13.588513][ T287] print_deadlock_bug+0x40a/0x650
[ 13.588684][ T287] validate_chain+0x5bf/0xae0
[ 13.588861][ T287] ? __pfx_validate_chain+0x10/0x10
[ 13.589048][ T287] ? hlock_class+0x4e/0x130
[ 13.589221][ T287] ? mark_lock+0x38/0x3e0
[ 13.589354][ T287] __lock_acquire+0xb9a/0x1680
[ 13.589533][ T287] ? udp_tunnel_nic_netdevice_event+0xd1/0x5c0
[ 13.589757][ T287] ? really_probe+0x1df/0x920
[ 13.589932][ T287] lock_acquire.part.0+0xeb/0x330
[ 13.590109][ T287] ? blocking_notifier_call_chain+0x50/0x90
[ 13.590326][ T287] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 13.590544][ T287] ? find_held_lock+0x2c/0x110
[ 13.590722][ T287] ? __pfx_lock_acquire.part.0+0x10/0x10
[ 13.590914][ T287] ? trace_lock_acquire+0x14c/0x1f0
[ 13.591086][ T287] ? lock_acquire+0x32/0xc0
[ 13.591256][ T287] ? blocking_notifier_call_chain+0x50/0x90
[ 13.591469][ T287] down_read+0x9f/0x340
[ 13.591598][ T287] ? blocking_notifier_call_chain+0x50/0x90
[ 13.591812][ T287] ? __pfx_down_read+0x10/0x10
[ 13.591982][ T287] ? notifier_call_chain+0xcd/0x150
[ 13.592162][ T287] blocking_notifier_call_chain+0x50/0x90
[ 13.592342][ T287] call_netdevice_notifiers+0x71/0xa0
[ 13.592513][ T287] ? __pfx_call_netdevice_notifiers+0x10/0x10
[ 13.592726][ T287] ? mutex_is_locked+0x1c/0x60
[ 13.592898][ T287] udp_tunnel_nic_register+0x591/0x870
[ 13.593070][ T287] udp_tunnel_nic_netdevice_event+0x11d/0x5c0
[ 13.593282][ T287] notifier_call_chain+0xcd/0x150
[ 13.593466][ T287] blocking_notifier_call_chain+0x66/0x90
[ 13.593639][ T287] register_netdevice+0xe75/0x1360
[ 13.593813][ T287] ? __pfx_register_netdevice+0x10/0x10
[ 13.593988][ T287] nsim_create+0x6c2/0xa60 [netdevsim]
[ 13.594190][ T287] __nsim_dev_port_add+0x22f/0x6e0 [netdevsim]
[ 13.594412][ T287] ? mark_lock+0x38/0x3e0
[ 13.594543][ T287] ? __pfx___nsim_dev_port_add+0x10/0x10 [netdevsim]
[ 13.594766][ T287] ? lockdep_hardirqs_on_prepare+0x275/0x410
[ 13.594979][ T287] nsim_dev_port_add_all+0x39/0xf0 [netdevsim]
[ 13.595208][ T287] nsim_drv_probe+0x61e/0x8b0 [netdevsim]
[ 13.595399][ T287] ? __pfx_nsim_drv_probe+0x10/0x10 [netdevsim]
[ 13.595620][ T287] ? kernfs_create_link+0x173/0x240
[ 13.595812][ T287] ? kernfs_put+0x1c/0x40
[ 13.595945][ T287] ? sysfs_do_create_link_sd+0x8c/0x100
[ 13.596128][ T287] really_probe+0x1df/0x920
[ 13.596304][ T287] __driver_probe_device+0x2e6/0x3e0
[ 13.596483][ T287] driver_probe_device+0x49/0x140
[ 13.596663][ T287] __device_attach_driver+0x192/0x2b0
[ 13.596839][ T287] ? __pfx___device_attach_driver+0x10/0x10
[ 13.597053][ T287] bus_for_each_drv+0x107/0x1a0
[ 13.597228][ T287] ? __pfx_bus_for_each_drv+0x10/0x10
[ 13.597404][ T287] ? bus_to_subsys+0xd5/0x110
[ 13.597581][ T287] ? __pfx___lock_release+0x10/0x10
[ 13.597793][ T287] ? __pfx_lock_acquire.part.0+0x10/0x10
[ 13.597964][ T287] __device_attach+0x1a3/0x3f0
[ 13.598135][ T287] ? __pfx___device_attach+0x10/0x10
[ 13.598306][ T287] ? bus_to_subsys+0xd5/0x110
[ 13.598477][ T287] ? do_raw_spin_unlock+0x58/0x220
[ 13.598648][ T287] bus_probe_device+0x133/0x180
[ 13.598824][ T287] device_add+0x99d/0x1110
[ 13.598999][ T287] ? __pfx_device_add+0x10/0x10
[ 13.599169][ T287] ? __init_waitqueue_head+0xcf/0x150
[ 13.599345][ T287] new_device_store+0x393/0x690 [netdevsim]
[ 13.599597][ T287] ? __pfx_new_device_store+0x10/0x10 [netdevsim]
[ 13.599826][ T287] ? __pfx_sysfs_kf_write+0x10/0x10
[ 13.600004][ T287] ? sysfs_file_ops+0x11e/0x170
[ 13.600182][ T287] ? __pfx_sysfs_kf_write+0x10/0x10
[ 13.600360][ T287] kernfs_fop_write_iter+0x2ba/0x460
[ 13.600534][ T287] vfs_write+0xa81/0x11e0
[ 13.600666][ T287] ? __pfx_vfs_write+0x10/0x10
[ 13.600851][ T287] ? __lock_release+0x103/0x460
[ 13.601025][ T287] ? do_user_addr_fault+0x972/0xe30
[ 13.601197][ T287] ? __pfx___up_read+0x10/0x10
[ 13.601368][ T287] ksys_write+0xf8/0x1d0
[ 13.601500][ T287] ? __pfx_ksys_write+0x10/0x10
[ 13.601671][ T287] ? do_user_addr_fault+0x97c/0xe30
[ 13.601842][ T287] do_syscall_64+0xc1/0x1d0
[ 13.602014][ T287] entry_SYSCALL_64_after_hwframe+0x77/0x7f
[ 13.602229][ T287] RIP: 0033:0x7fc24cb54b77
[ 13.602406][ T287] 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
[ 13.603011][ T287] RSP: 002b:00007ffd42709548 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[ 13.603270][ T287] RAX: ffffffffffffffda RBX: 0000000000000007 RCX: 00007fc24cb54b77
[ 13.603526][ T287] RDX: 0000000000000007 RSI: 0000560e9bec82f0 RDI: 0000000000000001
[ 13.603784][ T287] RBP: 0000560e9bec82f0 R08: 0000000000000006 R09: 0000000000000077
[ 13.604039][ T287] R10: 0000000000000063 R11: 0000000000000246 R12: 0000000000000007
[ 13.604295][ T287] R13: 00007fc24cc10760 R14: 0000000000000007 R15: 00007fc24cc0b9c0
[ 13.604557][ T287] </TASK>
[ 14.236929][ T298] GACT probability NOT on
[ 14.369030][ T302] drop_monitor: Initializing network drop monitor service