Hello, syzbot found the following issue on:
HEAD commit: bd78980b net: usb: ax88179_178a: initialize local variable.. git tree: net-next console output: https://syzkaller.appspot.com/x/log.txt?x=1043f831d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7eff0f22b8563a5f dashboard link: https://syzkaller.appspot.com/bug?extid=d6d7f5e816b836806b38 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d6d7f5e816b836806...@syzkaller.appspotmail.com ============================================ WARNING: possible recursive locking detected 5.12.0-rc4-syzkaller #0 Not tainted -------------------------------------------- syz-executor.2/10541 is trying to acquire lock: ffff888060ac8c78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_port_change_check drivers/net/team/team.c:2970 [inline] ffff888060ac8c78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_device_event+0x36a/0xa90 drivers/net/team/team.c:2996 but task is already holding lock: ffff888060ac8c78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_del_slave+0x29/0x140 drivers/net/team/team.c:1981 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(team->team_lock_key#3); lock(team->team_lock_key#3); *** DEADLOCK *** May be due to missing lock nesting notation 2 locks held by syz-executor.2/10541: #0: ffffffff8d66d7a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d66d7a8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5550 #1: ffff888060ac8c78 (team->team_lock_key#3){+.+.}-{3:3}, at: team_del_slave+0x29/0x140 drivers/net/team/team.c:1981 stack backtrace: CPU: 1 PID: 10541 Comm: syz-executor.2 Not tainted 5.12.0-rc4-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+0x141/0x1d7 lib/dump_stack.c:120 print_deadlock_bug kernel/locking/lockdep.c:2829 [inline] check_deadlock kernel/locking/lockdep.c:2872 [inline] validate_chain kernel/locking/lockdep.c:3661 [inline] __lock_acquire.cold+0x14c/0x3b4 kernel/locking/lockdep.c:4900 lock_acquire kernel/locking/lockdep.c:5510 [inline] lock_acquire+0x1ab/0x740 kernel/locking/lockdep.c:5475 __mutex_lock_common kernel/locking/mutex.c:949 [inline] __mutex_lock+0x139/0x1120 kernel/locking/mutex.c:1096 team_port_change_check drivers/net/team/team.c:2970 [inline] team_device_event+0x36a/0xa90 drivers/net/team/team.c:2996 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1722 vlan_device_event+0x8eb/0x2020 net/8021q/vlan.c:453 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2121 call_netdevice_notifiers_extack net/core/dev.c:2133 [inline] call_netdevice_notifiers net/core/dev.c:2147 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1722 dev_close net/core/dev.c:1744 [inline] dev_close+0x16d/0x210 net/core/dev.c:1738 team_port_del+0x34e/0x960 drivers/net/team/team.c:1349 team_del_slave+0x34/0x140 drivers/net/team/team.c:1982 do_set_master+0xe1/0x220 net/core/rtnetlink.c:2505 do_setlink+0x920/0x3a70 net/core/rtnetlink.c:2715 __rtnl_newlink+0xdcf/0x1710 net/core/rtnetlink.c:3376 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3491 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5553 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2502 netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927 sock_sendmsg_nosec net/socket.c:654 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:674 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350 ___sys_sendmsg+0xf3/0x170 net/socket.c:2404 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f23b77d7188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000466459 RDX: 0000000000000000 RSI: 00000000200001c0 RDI: 0000000000000004 RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff1a112cdf R14: 00007f23b77d7300 R15: 0000000000022000 --- This report is generated by a bot. 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