netlink: 'syz.2.3251': attribute type 9 has an invalid length.
vlan7: left promiscuous mode
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:609
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 18264, name: syz.2.3251
preempt_count: 201, expected: 0
RCU nest depth: 0, expected: 0
2 locks held by syz.2.3251/18264:
 #0: ffffffff8fdceac0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
 #1: ffff8881749dce18 (&br->lock){+.-.}-{3:3}, at: br_port_slave_changelink+0x3d/0x150
Preemption disabled at:
[<0000000000000000>] 0x0
CPU: 1 UID: 0 PID: 18264 Comm: syz.2.3251 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 __might_resched+0x378/0x4d0
 __mutex_lock+0x11c/0x1550
 dev_set_promiscuity+0x10e/0x260
 __dev_set_promiscuity+0x515/0x710
 netif_set_promiscuity+0x50/0xe0
 dev_set_promiscuity+0x126/0x260
 br_manage_promisc+0x4db/0x560
 br_port_flags_change+0x160/0x1f0
 br_setport+0xc0a/0x1680
 br_port_slave_changelink+0x12f/0x150
 rtnl_newlink+0x191b/0x1bb0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e0dd9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e0bfd5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6e0e016090 RCX: 00007f6e0dd9cdd9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 000000000000000b
RBP: 00007f6e0de32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e0e016128 R14: 00007f6e0e016090 R15: 00007fffaed6f538
 </TASK>

=============================
[ BUG: Invalid wait context ]
syzkaller #0 Tainted: G        W          
-----------------------------
syz.2.3251/18264 is trying to lock:
ffff8881bc472d88 (&dev_instance_lock_key#3){+.+.}-{4:4}, at: dev_set_promiscuity+0x10e/0x260
other info that might help us debug this:
context-{5:5}
2 locks held by syz.2.3251/18264:
 #0: ffffffff8fdceac0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
 #1: ffff8881749dce18 (&br->lock){+.-.}-{3:3}, at: br_port_slave_changelink+0x3d/0x150
stack backtrace:
CPU: 1 UID: 0 PID: 18264 Comm: syz.2.3251 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 __lock_acquire+0xec1/0x2cf0
 lock_acquire+0x106/0x350
 __mutex_lock+0x1a3/0x1550
 dev_set_promiscuity+0x10e/0x260
 __dev_set_promiscuity+0x515/0x710
 netif_set_promiscuity+0x50/0xe0
 dev_set_promiscuity+0x126/0x260
 br_manage_promisc+0x4db/0x560
 br_port_flags_change+0x160/0x1f0
 br_setport+0xc0a/0x1680
 br_port_slave_changelink+0x12f/0x150
 rtnl_newlink+0x191b/0x1bb0
 rtnetlink_rcv_msg+0x7d5/0xbe0
 netlink_rcv_skb+0x232/0x4b0
 netlink_unicast+0x75c/0x8e0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6e0dd9cdd9
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6e0bfd5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f6e0e016090 RCX: 00007f6e0dd9cdd9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 000000000000000b
RBP: 00007f6e0de32d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6e0e016128 R14: 00007f6e0e016090 R15: 00007fffaed6f538
 </TASK>
