I have upgraded the bluez-modules. But the problem persists:
To recap,
***********************************************************
Problem:
    lx1 runs rctest -s <bt_addr of lx2>
    lx2 freezes
   
    No problem with l2test.
***********************************************************

The current configuration of lx2 is :

usb dongles twin pack from amazing tech

==================================
Linux RH 8.0 running 2.6.0. kernel
# Bluetooth support
#
CONFIG_BT=m
CONFIG_BT_L2CAP=m
CONFIG_BT_SCO=m
CONFIG_BT_RFCOMM=m
CONFIG_BT_RFCOMM_TTY=y
CONFIG_BT_BNEP=m
CONFIG_BT_BNEP_MC_FILTER=y
CONFIG_BT_BNEP_PROTO_FILTER=y

#
# Bluetooth device drivers
#
CONFIG_BT_HCIUSB=m
CONFIG_BT_USB_SCO=y
# CONFIG_BT_USB_ZERO_PACKET is not set
# CONFIG_BT_HCIUART is not set
# CONFIG_BT_HCIVHCI is not set

[root@ebnt9638 bluetooth]# lsmod
Module                  Size  Used by
hci_usb                17152  2
rfcomm                 45720  0
l2cap                  31232  5 rfcomm
bluetooth              56420  7 hci_usb,rfcomm,l2cap
uhci_hcd               36232  0
ehci_hcd               26880  0


I have the following as well:
bluez-libs-2.8
bluez-utils-2.8
=============================================
hcidump (as root) data:
root@ebnt9638 swarup]# hcidump
HCIDump - HCI packet analyzer ver 1.9
device: hci0 snap_len: 1028 filter: 0xffffffff
 > HCI Event: Connect Request (0x04) plen 10
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7
 > HCI Event: Command Status (0x0f) plen 4
 > HCI Event: Connect Complete (0x03) plen 11
< HCI Command: Write Link Policy Settings (0x02|0x000d) plen 4
 > HCI Event: Max Slots Change (0x1b) plen 3
 > HCI Event: Command Complete (0x0e) plen 6
< HCI Command: Change Connection Packet Type (0x01|0x000f) plen 4
 > HCI Event: Command Status (0x0f) plen 4
 > ACL data: handle 0x0028 flags 0x02 dlen 12
    L2CAP(s): Connect req: psm 3 scid 0x0040
 > HCI Event: Connection Packet Type Changed (0x1d) plen 5
< ACL data: handle 0x0028 flags 0x02 dlen 16
    L2CAP(s): Connect rsp: dcid 0x0040 scid 0x0040 result 0 status 0
 > ACL data: handle 0x0028 flags 0x02 dlen 16
    L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 4
    MTU 1024
< ACL data: handle 0x0028 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
< ACL data: handle 0x0028 flags 0x02 dlen 16
    L2CAP(s): Config req: dcid 0x0040 flags 0x0000 clen 4
    MTU 1024
 > HCI Event: Number of Completed Packets (0x13) plen 5
 > HCI Event: Number of Completed Packets (0x13) plen 5
 > HCI Event: Number of Completed Packets (0x13) plen 5
 > ACL data: handle 0x0028 flags 0x02 dlen 14
    L2CAP(s): Config rsp: scid 0x0040 flags 0x0000 result 0 clen 0
 > ACL data: handle 0x0028 flags 0x02 dlen 8
    L2CAP(d): cid 0x40 len 4 [psm 3]
      RFCOMM(s): SABM: cr 1 dlci 0 pf 1 ilen 0 fcs 0x1c

=============================================
At this point the machine freezes !!

Swarup

Marcel Holtmann wrote:

>Hi Swarup,
>
>  
>
>>I have bluez with bluez-utils-2.7 on two RH 8.0 systems (lx1 and lx2).
>>    
>>
>
>please upgrade to bluez-utils-2.8 first. What kernel do you use?
>
>  
>
>>When I start rctest -r on lx1 without starting rctest -s on lx2, lx2 hangs
>>and I have to switch it off and on to restart. This happens EVERY TIME
>>I try this.
>>    
>>
>
>I don't get the point how lx2 can hang when you listen at lx1. Are these
>two different machines or two dongles connected to the same machine?
>
>  
>
>>This does not happen when I run l2test in any way. Does it prove that
>>there is a problem with RFCOMM? I have not seen this problem in
>>the mailing list. If I have missed it, please inform.
>>    
>>
>
>Actually I don't know. Show us "hcidump -x" from both machines.
>
>Regards
>
>Marcel
>
>
>
>
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