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I have a mail notification device that works with Slackware without problems. Lsusb shows the device as

Code: Select all: Bus 002 Device 002: ID 1294:1320 RISO KAGAKU CORP.

The script I can post, if that is necessary. It requires pyusb to be installed. I installed pyusb, version 1.0.0 release 1.mag2 noarch from the repos. On Slackware I have version 0.4.1 installed. It is for a 64 bit system, Mag is 64 bit also.

I am not a programmer, so I have no idea how to debug a segfault. The script was copied from my Slack system, so I dought the problem is the script itself. It is simple enough, it turns on ( or off ) leds in the device.

Not sure what to do next. Advice is appreciated.

Can you please show the output of the program with the segfault?
For how to debug it, please take a look at https://wiki.mageia.org/en/Debugging_software_crashes

Not much to show, here it is.

Code: Select all: ./setcolor.py 6 Segmentation fault

Same result if I run it as root, or from the file installed in /usr/bin.

Here is the script.

Code: Select all: #!/usr/bin/env python import usb import sys import time class MailNotifier: def makeData(self, color): return (color, 0, 0, 0, 0) def __init__(self): self.dev=UsbDevice(0x1294, 0x1320) self.dev.open() self.dev.handle.reset() def setColor(self, color): self.dev.handle.interruptWrite(0x02, self.makeData(color), 1000) class UsbDevice: def __init__(self, vendor_id, product_id): busses = usb.busses() self.handle = None count = 0 for bus in busses: devices = bus.devices for dev in devices: if dev.idVendor==vendor_id and dev.idProduct==product_id: self.dev = dev self.conf = self.dev.configurations[0] self.intf = self.conf.interfaces[0][0] self.endpoints = [] for endpoint in self.intf.endpoints: self.endpoints.append(endpoint) return sys.stderr.write("No mail notifier found\n") def open(self): if self.handle: self.handle = None try: self.handle = self.dev.open() self.handle.detachKernelDriver(0) self.handle.detachKernelDriver(1) self.handle.setConfiguration(self.conf) self.handle.claimInterface(self.intf) self.handle.setAltInterface(self.intf) return True except: return False def main(argv): if len(argv) != 2: sys.stderr.write("Usage : %s color_number\n" % argv[0]) else: m = MailNotifier() m.setColor(int(argv[1])) if __name__=="__main__": main(sys.argv)

Howto in following screencast:
http://ftp.mandrivauser.de/rpm/rpm/extr ... e_tags.ogv

Further investigation on pyusb package shows in the readme:

2) At least one of the supported libraries (libusb 1.0, libusb 0.1 or OpenUSB)

I looked for any of the libusb packages and none are installed. Looking through the list shows only packages for Arch i586, and nothing for x86_64.

So, I guess the next wuestion is are my repos set up correctly? The other possibility is the 64 bit versions are not there; where can I find them?

Futher investigation, I have lib64usb1.0_0 version 1.0.9 installed, I'm guessing that looks after the above lib requirement.

Please show the output of

Code: Select all: rpm -qa | grep -i usb

Code: Select all: rpm -qa | grep -i usb lib64usb1.0_0-1.0.9-1.mga2 usb_modeswitch-1.2.1-1.mga2 lib64gusb2-0.1.3-1.mga2 usbutils-005-1.mga2 x11-driver-video-sisusb-0.9.4-6.mga2 lib64usbmuxd1-1.0.7-2.mga2 usb_modeswitch-data-20111023-1.mga2 lib64usb-compat0.1_4-0.1.3-6.mga2 usbmuxd-1.0.7-2.mga2 pyusb-1.0.0-1.mga2

Well, you have both libusb 1.0 and libusb 0.1 as the script requires, so it should work. But it maybe that those two are conflicting, and you can only have one installed. Or you need the i586 version, but i'm not sure.

I'm afraid i'm also not good at python debugging, but i suggest to run it under strace, and study the output, and maybe it gives a hint to what the actual problem is.
Just do something like

Code: Select all: strace -f -o output.log sh setcolor.py 6

and then afterwards have a look in the file output.log

Some USB devices need to load a binary file to make them work.

What is this device you are using? 0x1294 0x1320

It might be a possibility that this device isn't getting whatever internal firmware driver loaded.
Sometimes these devices change ID after they have their binary loaded, for example, your device 0x1294,0x1320 may be 1294,0x1330 before it loads the binary file.

You can type
lsusb
on the command line to see if it identifies itself.

It may need some sort of appropriate startup file within udev's rules.d directory.

...just throwing some ideas.

Have a look at the first post for the lsusb output

Got a question. The command you asked to run

Code: Select all: strace -f -o output.log sh setcolor.py 6

If I run this command, with the 'sh' in front of the setcolor.py; I get a symbol on the command line, looking for me to draw an elastic box around something. If I do, then I do not see the program run to completion, or the segfault error. I do not understand what the 'sh' is doing. I ran this command as root.

I ran the command without the sh and get the expected output.log file created. It Segfaults in Magia. I ran the same command on my slack system, and created an output file there also. I can not point at anything that I see as a problem. I' going to include the last 20 or so lines from each run. My hope is someone hear can point me in the right direction.

First the Magia run.

Code: Select all: 7246 open("/dev/bus/usb/002/003", O_RDONLY) = 7 7246 lseek(7, 18, SEEK_SET) = 18 7246 read(7, "\t\2\261\0\2\1\0\300\0\t\4\0\0\3\340\1\1\0\7\5\201\3\20\0\1\7\5\2\2@\0\1"..., 177) = 177 7246 close(7) = 0 7246 open("/dev/bus/usb/002/003", O_RDONLY) = 7 7246 lseek(7, 18, SEEK_SET) = 18 7246 read(7, "\t\2\261\0\2\1\0\300", 8) = 8 7246 close(7) = 0 7246 open("/dev/bus/usb/002/003", O_RDONLY) = 7 7246 lseek(7, 18, SEEK_SET) = 18 7246 read(7, "\t\2\261\0\2\1\0\300\0\t\4\0\0\3\340\1\1\0\7\5\201\3\20\0\1\7\5\2\2@\0\1"..., 177) = 177 7246 close(7) = 0 7246 open("/dev/bus/usb/002/002", O_RDWR) = 7 7246 write(4, "\1", 1) = 1 7246 read(3, "\1", 1) = 1 7246 ioctl(7, SNDRV_CTL_IOCTL_ELEM_READ or USBDEVFS_IOCTL or USBDEVFS_IOCTL32, {ifno=0x0, ioctl_code=0x5516}) = -1 ENODATA (No data available) 7246 ioctl(7, SNDRV_CTL_IOCTL_ELEM_LOCK or USBDEVFS_RESET, 0) = 0 7246 write(4, "\1", 1) = 1 7246 read(3, "\1", 1) = 1 7246 close(7) = 0 7246 --- {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x40} (Segmentation fault) --- 7246 +++ killed by SIGSEGV +++

Now, from the Slackware run.

Code: Select all: 3321 read(3, "\t\2\31\0\1\1\0\340", 8) = 8 3321 close(3) = 0 3321 open("/dev/bus/usb/002/001", O_RDONLY) = 3 3321 lseek(3, 18, SEEK_SET) = 18 3321 read(3, "\t\2\31\0\1\1\0\340\0\t\4\0\0\1\t\0\0\0\7\5\201\3\2\0\377", 25) = 25 3321 close(3) = 0 3321 open("/dev/bus/usb/002/002", O_RDWR) = 3 3321 write(5, "\1", 1) = 1 3321 read(4, "\1", 1) = 1 3321 ioctl(3, USBDEVFS_IOCTL or USBDEVFS_IOCTL32, 0x7fff057fe170) = -1 ENODATA (No data available) 3321 ioctl(3, USBDEVFS_RESET, 0) = 0 3321 ioctl(3, USBDEVFS_SUBMITURB or USBDEVFS_SUBMITURB32, 0x6a2900) = 0 3321 timerfd_settime(6, TFD_TIMER_ABSTIME, {it_interval={0, 0}, it_value={367, 381043000}}, NULL) = 0 3321 poll([{fd=4, events=POLLIN}, {fd=6, events=POLLIN}, {fd=3, events=POLLOUT}], 3, 60000) = 1 ([{fd=3, revents=POLLOUT}]) 3321 ioctl(3, USBDEVFS_REAPURBNDELAY or USBDEVFS_REAPURBNDELAY32, 0x7fff057fe658) = 0 3321 timerfd_settime(6, 0, {it_interval={0, 0}, it_value={0, 0}}, NULL) = 0 3321 write(5, "\1", 1) = 1 3321 read(4, "\1", 1) = 1 3321 close(3) = 0 3321 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7fe5c3e0ac50}, {0x7fe5c4138090, [], SA_RESTORER, 0x7fe5c3e0ac50}, 8) = 0 3321 exit_group(0)

If needed, I can post the entire output.log from each system. The only other thing I noticed from the trace is Slack is running Python 2.6, and Mag is running 2.7. No idea if this is significant or not.

Thank-you for your continued help.

camorri wrote:Got a question. The command you asked to run
Code: Select all
strace -f -o output.log sh setcolor.py 6
If I run this command, with the 'sh' in front of the setcolor.py; I get a symbol on the command line, looking for me to draw an elastic box around something. If I do, then I do not see the program run to completion, or the segfault error. I do not understand what the 'sh' is doing. I ran this command as root.

I ran the command without the sh and get the expected output.log file created.

Sorry, i didn't know how to run a python script under strace, but you found out yourself

Maybe you user needs to be in the usb group? Please show the output of

Code: Select all: id name_of_your_user

and maybe compare that to slackware.
Also it could be that in that slackware install usbfs is mounted, could you please show the output of

Code: Select all: mount

from slackware?

From my Slackware system

Code: Select all: mount /dev/sdb1 on / type ext4 (rw,relatime,user_xattr,acl,barrier=1,data=ordered) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) none on /proc/bus/usb type usbfs (rw,devgid=1000,devmode=664) /dev/sdb5 on /home type ext4 (rw,user_xattr) /dev/sdb6 on /usr type ext4 (rw) /dev/sda6 on /mnt/sda6 type ext4 (rw) tmpfs on /dev/shm type tmpfs (rw) tmpfs on /tmp type tmpfs (rw) none on /home/cliff/.thumbnails type tmpfs (rw) none on /tmp type tmpfs (rw) nfsd on /proc/fs/nfs type nfsd (rw) nfsd on /proc/fs/nfsd type nfsd (rw)

I'll boot, and post the rest of the asked for information.

From Magia,

Code: Select all: id cliff uid=1000(cliff) gid=4(adm) groups=4(adm),2(daemon),7(lp),12(mail),19(floppy),22(cdrom),43(usb),80(cdwriter),81(audio),82(video),100(users),497(avahi),494(haldaemon),490(usbmux),486(mlocate),420(vboxusers),415(toruser)

camorri wrote:
Code: Select all
none on /proc/bus/usb type usbfs (rw,devgid=1000,devmode=664)

See? That could already be the important difference.

I added this line to /etc/fstab on Mag

Code: Select all: #Entry for usbfs none /proc/bus/usb usbfs devgid=1000,devmode=664 0 0

Now mount shows

Code: Select all: mount | grep usbfs usbfs on /proc/bus/usb type usbfs (rw,relatime,devgid=43,devmode=664)

The script still segfaults, run as a regular user and root user.

I have spent some time learning how to debug python scripts. It appears to me the failure is not in the script itself. I now believe the error is in libusb. Here is the error as reported to syslog.

Code: Select all: python[11039]: segfault at 48 ip 00007f2861b354f6 sp 00007fffe33052b0 error 4 in libusb-1.0.so.0.1.0[7f2861b2e000+f000]

Thoughts on what to do from here?

Well, report it as a bug: https://wiki.mageia.org/en/How_to_report_a_bug_properly

There seems to be a problem with libusb-1.0 which your script is using.
I have been wrestling with a similar problem. After a lot of googling and reading it turns out there is a bug in the library file required.
As yet I haven't found an answer.

camorri wrote:Further investigation on pyusb package shows in the readme:
2) At least one of the supported libraries (libusb 1.0, libusb 0.1 or OpenUSB)

As the script says it can support both which are available on Mageia, maybe just try to rule out one of those?

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