r0 = fsmount(0xffffffffffffffff, 0x0, 0x80)
syz_genetlink_get_family_id$mptcp(0x0, r0)
r1 = accept$unix(r0, 0x0, &(0x7f0000000040))
ioctl$BTRFS_IOC_TREE_SEARCH_V2(r1, 0xc0709411, &(0x7f0000000080)={{0x0, 0x401, 0x0, 0x0, 0x101, 0x0, 0x0, 0x1, 0x0, 0x0, 0x5, 0x0, 0xffffffff, 0x63, 0x8001}, 0x10, [0x0, 0x0]})
accept4$unix(r1, &(0x7f0000000100)=@abs, &(0x7f0000000180)=0x6e, 0x0)
fork()
socketpair(0x1, 0x0, 0x39398780, &(0x7f0000000480))