linux-kernel - udev regression? lsusb silent (no output) since 2.6.22-rc2 at least

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Date:	Sat, 26 May 2007 22:18:54 +0200
From:	bert hubert <bert.hubert@...herlabs.nl>
To:	linux-kernel@...r.kernel.org, gregkh@...e.de
Cc:	kay.sievers@...y.org
Subject: udev regression? lsusb silent (no output) since 2.6.22-rc2 at least

Greg, Kay, kernel people,

Today I booted 2.6.22-rc2 on Ubunty Edgy Eft, and lsusb died on me:

ahu@...el:~$ lsusb
ahu@...el:~$ sudo lsusb
ahu@...el:~$ 

This behaviour persists in rc4. This might be udev related. I'm running:
ii  udev                                   093-0ubuntu18.0edgy2 

USB does work fine.

Bit from strace:

open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 4 entries */, 4096)    = 112
close(3)                                = 0
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 4 entries */, 4096)    = 112
getdents64(3, /* 0 entries */, 4096)    = 0
close(3)                                = 0
(end of program)

ahu@...el:~$ ls -l /dev/bus/usb -d
drwxr-xr-x 3 root root 80 2007-05-26 21:58 /dev/bus/usb

ahu@...el:~$ ls -l /dev/bus/usb/
total 0
lrwxrwxrwx 1 root root 14 2007-05-26 21:58 devices -> .usbfs/devices

ahu@...el:~$ ls -l /dev/bus/usb/devices 
lrwxrwxrwx 1 root root 14 2007-05-26 21:58 /dev/bus/usb/devices ->
.usbfs/devices

ahu@...el:~$ wc -l /dev/bus/usb/devices
95 /dev/bus/usb/devices

On another machine (debian etch), with an older kernel, where lsusb does
work:

open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 4 entries */, 4096)    = 96
close(3)                                = 0 
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 4 entries */, 4096)    = 96
getdents64(3, /* 0 entries */, 4096)    = 0 
close(3)                                = 0 
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY) = 3
fstat64(3, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl64(3, F_SETFD, FD_CLOEXEC)         = 0
getdents64(3, /* 3 entries */, 4096)    = 72
open("/dev/bus/usb/001/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY)  = 4

Any clues? Please let me know how I can help solve this problem!

	Bert

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