I just tried it with kdebug 65535. For a while it was working fine,
with copious debug in /var/log/. Then the debug suddenly stopped
appearing. Mysteriously, PPP continued to work for a couple of
minutes. Then it stopped working, as usual. (I was repeatedly doing
cvs update to provoke the problem.)
It looks as though logging stopped in the middle of
ppp_print_buffer():
May 17 19:17:55 rano kernel: ppp: receive buffer, count = 61
May 17 19:17:55 rano kernel: 6C 69 64 69 74 79 20 6F lidity o
May 17 19:17:55 rano kernel: 66 20 74 68 65 20 6B 65 f the ke
May 17 19:17:55 rano kernel: 79 2D 75 69 64 20 61 73 y-uid as
May 17 19:17:55 rano kernel: 73 6F 63 69 61 74 69 6F sociatio
May 17 19:17:55 rano kernel: 6E 0A 20 20 2A 2A 20 20 n. **
(Yes, only 40 bytes were printed.)
About a minute earlier, something very weird was logged in
/var/log/messages:
May 17 19:04:03 rano kernel: ppp_ioctl: set flags to f1f0003
May 17 19:04:03 rano kernel: ppp_ioctl: set maxcid to 16
May 17 19:04:03 rano kernel: ppp_ioctl: set flags to f1f0007
May 17 19:12:41 rano kernel: ppp: error in VJ decompression
May 17 19:15:44 rano kernel: 2F /README/
May 17 19:15:45 rano kernel: 6E .6///.Un
May 17 19:15:57 rano kernel: P_SUBDIR
May 17 19:16:05 rano kernel: gdb, n
May 17 19:16:11 rano kernel: clrt
May 17 19:16:50 rano kernel: i
What kind of message is that? It looks a bit like random extracts from
the CVS session, but what's it doing in my log file?
I had to restart syslogd to get kernel debug messages again.
Here's a similar mess from /var/log/messages from a later crashed PPP
connection:
May 17 22:34:52 rano kernel: ppp_ioctl: set dbg flags to 1f0000
May 17 22:35:15 rano kernel: ppp_ioctl: set dbg flags to 0
May 17 22:35:27 rano kernel: ppp_ioctl: set dbg flags to 1f0000
May 17 22:36:36 rano kernel: 50 .CHARMAP
May 17 22:37:24 rano kernel: 50 .CHARMAP
May 17 22:37:50 rano kernel: P_SUBDIR
May 17 22:38:01 rano kernel: menu->c
May 17 22:38:03 rano kernel: ,g=r,o
Any idea how I could investigate this?
Do the people who wrote this code read this list?
Edmund
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