possible deadlock in team_del

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	possible deadlock in team_del_slave net	4				1	1788d	1786d	0/29	auto-closed as invalid on 2022/01/16 14:16
upstream	possible deadlock in team_del_slave (2) net	4				35	1125d	1289d	0/29	auto-obsoleted due to no activity on 2023/09/28 12:50
linux-6.1	possible deadlock in team_del_slave origin:upstream missing-backport	4	syz, C		inconclusive	78	5h03m	867d	0/3	upstream: reported C repro on 2024/03/27 10:53
linux-5.15	possible deadlock in team_del_slave (2) origin:lts-only	4	syz, C		error	92	8d03h	941d	0/3	upstream: reported C repro on 2024/01/12 21:46
linux-6.6	possible deadlock in team_del_slave missing-backport origin:lts-only	4	syz, C		inconclusive	27480	27m	420d	0/2	upstream: reported C repro on 2025/06/16 19:00
upstream	possible deadlock in team_del_slave (3) net	4	syz, C	error		386707	353d	837d	29/29	fixed on 2025/09/04 16:57

====================================================== WARNING: possible circular locking dependency detected 5.15.107-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/4480 is trying to acquire lock: ffff88802bc74cf8 (team->team_lock_key#4){+.+.}-{3:3}, at: team_del_slave+0x2e/0x1f0 drivers/net/team/team.c:1993 but task is already holding lock: ffff88807b538628 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x127/0x370 net/wireless/nl80211.c:4103 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&rdev->wiphy.mtx){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 wiphy_lock include/net/cfg80211.h:5311 [inline] ieee80211_open+0x13a/0x1f0 net/mac80211/iface.c:361 __dev_open+0x36f/0x500 net/core/dev.c:1486 dev_open+0xa9/0x260 net/core/dev.c:1522 team_port_add drivers/net/team/team.c:1210 [inline] team_add_slave+0x916/0x2760 drivers/net/team/team.c:1979 do_set_master net/core/rtnetlink.c:2523 [inline] do_setlink+0xe71/0x3af0 net/core/rtnetlink.c:2728 __rtnl_newlink net/core/rtnetlink.c:3395 [inline] rtnl_newlink+0x177d/0x2060 net/core/rtnetlink.c:3510 rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5587 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2533 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1952 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb -> #0 (team->team_lock_key#4){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 team_del_slave+0x2e/0x1f0 drivers/net/team/team.c:1993 team_device_event+0x267/0x490 drivers/net/team/team.c:3016 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:1998 [inline] call_netdevice_notifiers_extack net/core/dev.c:2010 [inline] call_netdevice_notifiers net/core/dev.c:2024 [inline] unregister_netdevice_many+0xf1b/0x18f0 net/core/dev.c:11065 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10998 unregister_netdevice include/linux/netdevice.h:3012 [inline] _cfg80211_unregister_wdev+0x181/0x510 net/wireless/core.c:1127 ieee80211_if_remove+0x1cc/0x2c0 net/mac80211/iface.c:2090 ieee80211_del_iface+0x15/0x20 net/mac80211/cfg.c:145 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline] nl80211_del_interface+0x1f5/0x370 net/wireless/nl80211.c:4105 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0xfbd/0x14a0 net/netlink/genetlink.c:792 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2533 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1952 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rdev->wiphy.mtx); lock(team->team_lock_key#4); lock(&rdev->wiphy.mtx); lock(team->team_lock_key#4); *** DEADLOCK *** 3 locks held by syz-executor.1/4480: #0: ffffffff8da332b0 (cb_lock){++++}-{3:3}, at: genl_rcv+0x15/0x40 net/netlink/genetlink.c:802 #1: ffffffff8d9d3ca8 (rtnl_mutex){+.+.}-{3:3}, at: nl80211_pre_doit+0x28/0x540 net/wireless/nl80211.c:14959 #2: ffff88807b538628 (&rdev->wiphy.mtx){+.+.}-{3:3}, at: nl80211_del_interface+0x127/0x370 net/wireless/nl80211.c:4103 stack backtrace: CPU: 0 PID: 4480 Comm: syz-executor.1 Not tainted 5.15.107-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1646/0x58b0 kernel/locking/lockdep.c:3787 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5011 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5622 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 team_del_slave+0x2e/0x1f0 drivers/net/team/team.c:1993 team_device_event+0x267/0x490 drivers/net/team/team.c:3016 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391 call_netdevice_notifiers_info net/core/dev.c:1998 [inline] call_netdevice_notifiers_extack net/core/dev.c:2010 [inline] call_netdevice_notifiers net/core/dev.c:2024 [inline] unregister_netdevice_many+0xf1b/0x18f0 net/core/dev.c:11065 unregister_netdevice_queue+0x2e6/0x350 net/core/dev.c:10998 unregister_netdevice include/linux/netdevice.h:3012 [inline] _cfg80211_unregister_wdev+0x181/0x510 net/wireless/core.c:1127 ieee80211_if_remove+0x1cc/0x2c0 net/mac80211/iface.c:2090 ieee80211_del_iface+0x15/0x20 net/mac80211/cfg.c:145 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline] nl80211_del_interface+0x1f5/0x370 net/wireless/nl80211.c:4105 genl_family_rcv_msg_doit net/netlink/genetlink.c:731 [inline] genl_family_rcv_msg net/netlink/genetlink.c:775 [inline] genl_rcv_msg+0xfbd/0x14a0 net/netlink/genetlink.c:792 netlink_rcv_skb+0x1cf/0x410 net/netlink/af_netlink.c:2533 genl_rcv+0x24/0x40 net/netlink/genetlink.c:803 netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline] netlink_unicast+0x7b6/0x980 net/netlink/af_netlink.c:1356 netlink_sendmsg+0xa30/0xd60 net/netlink/af_netlink.c:1952 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg net/socket.c:724 [inline] ____sys_sendmsg+0x59e/0x8f0 net/socket.c:2412 ___sys_sendmsg+0x252/0x2e0 net/socket.c:2466 __sys_sendmsg net/socket.c:2495 [inline] __do_sys_sendmsg net/socket.c:2504 [inline] __se_sys_sendmsg+0x19a/0x260 net/socket.c:2502 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f18bf9aa169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f18bdf1c168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f18bfac9f80 RCX: 00007f18bf9aa169 RDX: 0000000000000000 RSI: 0000000020000600 RDI: 0000000000000003 RBP: 00007f18bfa05ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd004b928f R14: 00007f18bdf1c300 R15: 0000000000022000 </TASK> team0: Port device wlan0 removed

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2023/04/15 07:03	linux-5.15.y	4fdad925aa1a	ec410564	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan	possible deadlock in team_del_slave

Crashes (1):

Assets (help?)