I am using PPP currently, but sometimes the process "pppd" becomes
UNINTERRUPTIBLE while the serial port is still active. My kernel is
linux-2.6.21.
For now I have got the short message from "dmesg" as bellow:


[ 1398.270000] [] (raw_notifier_call_chain+0x0/0x14) from
[] (unregister_netdevice+0x1a0/0x294)
[ 1398.270000] [] (unregister_netdevice+0x0/0x294) from
[] (unregister_netdev+0x20/0x28)
[ 1398.270000] r6 = C159C800 r5 = C1B5F400 r4 = C1B5F400
[ 1398.270000] [] (unregister_netdev+0x0/0x28) from
[] (ppp_shutdown_interface+0x7c/0xc8)
[ 1398.270000] r4 = C0EEC000
[ 1398.270000] [] (ppp_shutdown_interface+0x0/0xc8) from
[] (ppp_release+0x44/0x9c)
[ 1398.270000] r7 = C13D7238 r6 = C13AB638 r5 = 00000008 r4 = C159C800
[ 1398.270000] [] (ppp_release+0x0/0x9c) from []
(__fput+0xb8/0x1b4)
[ 1398.270000] r4 = C1674840
[ 1398.270000] [] (__fput+0x0/0x1b4) from []
(fput+0x34/0x38)
[ 1398.270000] r8 = 00000001 r7 = C202DDE0 r6 = 00000000 r5 = C07EC380
[ 1398.270000] r4 = C1674840
[ 1398.270000] [] (fput+0x0/0x38) from []
(filp_close+0x78/0x84)
[ 1398.270000] [] (filp_close+0x0/0x84) from []
(put_files_struct+0x88/0xe0)
[ 1398.270000] r6 = 000000D4 r5 = 0000077F r4 = C07EC380
[ 1398.270000] [] (put_files_struct+0x0/0xe0) from
[] (do_exit+0x248/0x90c)
[ 1398.270000] r8 = 00000009 r7 = 00000001 r6 = C0EEDFB0 r5 = C07EB320
[ 1398.270000] r4 = C07EC380
[ 1398.270000] [] (do_exit+0x0/0x90c) from []
(do_group_exit+0xc4/0xcc)
[ 1398.270000] [] (do_group_exit+0x0/0xcc) from []
(get_signal_to_deliver+0x3e0/0x42c)
[ 1398.270000] r4 = C3581B54
[ 1398.270000] [] (get_signal_to_deliver+0x0/0x42c) from
[] (do_signal+0x64/0x4d4)
[ 1398.270000] [] (do_signal+0x0/0x4d4) from []
(do_notify_resume+0x2c/0x30)
[ 1398.270000] [] (do_notify_resume+0x0/0x30) from
[] (work_pending+0x1c/0x20)
[ 1398.270000] Code: e1a0c00d e92dd810 e24cb004 e24dd004 (e5904014)
[ 1398.810000] Fixing recursive fault but reboot is needed!


Thanks a lot!



Best Regards!
Jianhai Yang.
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