============================================ WARNING: possible recursive locking detected 5.11.0-rc5-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/8675 is trying to acquire lock: ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: cfg80211_netdev_notifier_call+0x68c/0x1180 net/wireless/core.c:1404 but task is already holding lock: ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_register_hw+0x1da8/0x3c70 net/mac80211/main.c:1278 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&rdev->wiphy.mtx); lock(&rdev->wiphy.mtx); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor.0/8675: #0: ffffffff8caea150 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:810 #1: ffffffff8caea208 (genl_mutex){+.+.}-{3:3}, at: genl_lock net/netlink/genetlink.c:33 [inline] #1: ffffffff8caea208 (genl_mutex){+.+.}-{3:3}, at: genl_rcv_msg+0x3e0/0x580 net/netlink/genetlink.c:798 #2: ffffffff8ca5a3c8 (rtnl_mutex){+.+.}-{3:3}, at: ieee80211_register_hw+0x1d80/0x3c70 net/mac80211/main.c:1277 #3: ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: wiphy_lock include/net/cfg80211.h:5267 [inline] #3: ffff888059f385e8 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: ieee80211_register_hw+0x1da8/0x3c70 net/mac80211/main.c:1278 stack backtrace: CPU: 1 PID: 8675 Comm: syz-executor.0 Not tainted 5.11.0-rc5-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 print_deadlock_bug kernel/locking/lockdep.c:2761 [inline] check_deadlock kernel/locking/lockdep.c:2804 [inline] validate_chain kernel/locking/lockdep.c:3595 [inline] __lock_acquire.cold+0x114/0x39e kernel/locking/lockdep.c:4832 lock_acquire kernel/locking/lockdep.c:5442 [inline] lock_acquire+0x1a8/0x720 kernel/locking/lockdep.c:5407 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x134/0x1110 kernel/locking/mutex.c:1103 wiphy_lock include/net/cfg80211.h:5267 [inline] cfg80211_netdev_notifier_call+0x68c/0x1180 net/wireless/core.c:1404 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2040 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] unregister_netdevice_many+0x943/0x1750 net/core/dev.c:10704 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10638 register_netdevice+0x10cd/0x1500 net/core/dev.c:10013 cfg80211_register_netdevice+0x11d/0x2a0 net/wireless/core.c:1346 ieee80211_if_add+0xfb2/0x18e0 net/mac80211/iface.c:1990 ieee80211_register_hw+0x331a/0x3c70 net/mac80211/main.c:1285 mac80211_hwsim_new_radio+0x20d2/0x48d0 drivers/net/wireless/mac80211_hwsim.c:3333 hwsim_new_radio_nl+0x9a6/0x10b0 drivers/net/wireless/mac80211_hwsim.c:3894 genl_family_rcv_msg_doit+0x228/0x320 net/netlink/genetlink.c:739 genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0x328/0x580 net/netlink/genetlink.c:800 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e219 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fcebc5cbc68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007fffced6afef R14: 00007fcebc5cc9c0 R15: 000000000119bf8c