Public bug reported:
Binary package hint: libpcap0.8
$ apt-cache policy libpcap
libpcap0.8:
Installed: 1.0.0-2ubuntu1
Candidate: 1.0.0-2ubuntu1
Version table:
*** 1.0.0-2ubuntu1 0
500 http://nl.archive.ubuntu.com karmic/main Packages
100 /var/lib/dpkg/status
Trying to capture data from USB:
$ sudo tcpdump -D
1.eth0
2.any (Pseudo-device that captures on all interfaces)
3.lo
(No usbmon interfaces listed at all, as it turned out, I was affected by LP:
#355613, but I didn't know that yet.)
I try capturing from usbmon1 anyway:
$ sudo tcpdump -i usbmon1
tcpdump: Can't open USB bus file /sys/kernel/debug/usbmon/1t: No such file or
directory
The file path it tries to open is wrong! It should be
/sys/kernel/debug/usb/usbmon/1t
After I used the workaround for LP: #355613, without making any changes
to libpcap, I could capture from usbmon1 anyway.
Looking back, it seems that, after being blocked from accessing
/dev/usbmon1 by AppArmor libpcap tried falling back to using the
debugfs usbmon1, which resulted in the error mentioned above.
Lucky me it seems, this is a case of bugs helping to find other bugs :-)
** Affects: libpcap0.8 (Ubuntu)
Importance: Undecided
Status: New
--
wrong path to usbmon in debugfs
https://bugs.launchpad.net/bugs/508275
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