Hi,

I'm using the Alcatel SpeedTouch modem. It is working fine. :-)
Meanwhile, when the pppd process is killed, the following oops appears.

It seems ppp_synctty is trying to enable softirqs while softirqs are 
already enable.

Jul  6 15:30:04 tigre01 pppoa2[1345]: Killed by a signal 15
Jul  6 15:30:04 tigre01 pppd[1344]: Terminating on signal 15.
Jul  6 15:30:04 tigre01 pppd[1344]: Modem hangup
Jul  6 15:30:04 tigre01 pppd[1344]: Connection terminated.
Jul  6 15:30:04 tigre01 pppd[1344]: Connect time 16.5 minutes.
Jul  6 15:30:04 tigre01 pppd[1344]: Sent 10266 bytes, received 39428 bytes.
Jul  6 15:30:04 tigre01 kernel: Badness in local_bh_enable at 
kernel/softirq.c:109
Jul  6 15:30:04 tigre01 kernel: Call Trace:
Jul  6 15:30:04 tigre01 kernel:  [<c0129265>] local_bh_enable+0x85/0xa0
Jul  6 15:30:04 tigre01 kernel:  [<e982fe73>] ppp_sync_push+0xd3/0x280 
[ppp_synctty]
Jul  6 15:30:04 tigre01 kernel:  [<e982f768>] ppp_sync_wakeup+0x28/0x60 
[ppp_synctty]
Jul  6 15:30:04 tigre01 kernel:  [<c0226e32>] do_tty_hangup+0x492/0x560
Jul  6 15:30:04 tigre01 kernel:  [<c0228704>] release_dev+0x644/0x6a0
Jul  6 15:30:04 tigre01 kernel:  [<c01516d9>] zap_pte_range+0x1d9/0x220
Jul  6 15:30:04 tigre01 kernel:  [<c015175d>] zap_pmd_range+0x3d/0x60
Jul  6 15:30:04 tigre01 kernel:  [<c01517bf>] unmap_page_range+0x3f/0x80
Jul  6 15:30:04 tigre01 kernel:  [<c0228b1c>] tty_release+0x3c/0xc0
Jul  6 15:30:04 tigre01 kernel:  [<c016433a>] __fput+0x11a/0x140
Jul  6 15:30:04 tigre01 kernel:  [<c01628d9>] filp_close+0xb9/0x120
Jul  6 15:30:04 tigre01 kernel:  [<c0126507>] put_files_struct+0x67/0xc0
Jul  6 15:30:04 tigre01 kernel:  [<c01272fd>] do_exit+0x1fd/0x660
Jul  6 15:30:04 tigre01 kernel:  [<c0127790>] sys_exit+0x10/0x20
Jul  6 15:30:04 tigre01 kernel:  [<c010b4e7>] syscall_call+0x7/0xb
Jul  6 15:30:04 tigre01 kernel:
Jul  6 15:30:04 tigre01 pppd[1344]: Exit.
Jul  6 15:30:24 tigre01 pppd[1477]: pppd 2.4.1 started by root, uid 0
Jul  6 15:30:24 tigre01 pppd[1477]: Using interface ppp0
Jul  6 15:30:24 tigre01 pppd[1477]: Connect: ppp0 <--> /dev/pts/7
Jul  6 15:30:24 tigre01 pppoa2[1478]: Starting PPPoA2 ( merged version 
includes new ATM/AAL5 stack ) 1_0
Jul  6 15:30:24 tigre01 pppoa2[1478]: I'm the parent   process, I handle 
the endpoint 0x07
Jul  6 15:30:24 tigre01 pppoa2[1479]: I'm the children process, I handle 
the endpoint 0x87
Jul  6 15:30:26 tigre01 pppd[1477]: Remote message: CHAP authentication 
success, unit 409
Jul  6 15:30:26 tigre01 pppd[1477]: local  IP address 217.128.159.113
Jul  6 15:30:27 tigre01 pppd[1477]: remote IP address 217.128.159.1
Jul  6 15:30:27 tigre01 pppd[1477]: primary   DNS address 193.252.19.3
Jul  6 15:30:27 tigre01 pppd[1477]: secondary DNS address 
193.252.19.4106 void local_bh_enable(void)

    107 {
    108         __local_bh_enable();
    109         WARN_ON(irqs_disabled());
    110         if (unlikely(!in_interrupt() &&
    111                      local_softirq_pending()))
    112                 invoke_softirq();
    113         preempt_check_resched();
    114 }

Regards,
Remi