[sane-devel] Enumeration devices gets SEGV on Ubuntu 16.10

[Wilhelm Meier]

Hi all,

there are problems scanning for new usb-devices on Ubuntu-16.10. This
problem hits most (all) users of scanbd if they remove/insert usb devices.

It can be be broken down to the following example, which crashes with
SEGV if one inserts/removes use-devices:

#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <sane/sane.h>

int main () {
   while (true) {
       SANE_Int sane_version = 0;
       if (sane_init(&sane_version, 0) != SANE_STATUS_GOOD) {
           printf("Can't init sane\n");
           exit(EXIT_FAILURE);
       }
       printf("sane version %d.%d\n", SANE_VERSION_MAJOR(sane_version),
SANE_VERSION_MINOR(sane_version));

       const SANE_Device** device_list = NULL;
       if (sane_get_devices(&device_list, SANE_TRUE) == SANE_STATUS_GOOD) {
           const SANE_Device** dev = device_list;
           while (*dev) {
               printf("dev name: %s\n", (*dev)->name);
               dev++;
           }
       } else {
           printf("Can't get dev list\n");
           exit(EXIT_FAILURE);
       }
       sleep (1);
       printf("sane_exit\n");
       sane_exit();
       sleep (1);
   }
   exit(EXIT_SUCCESS);
}

Are there any hints or workarounds?

BTW: on ArchLinux and Gentoo there are no problems ...

--
 Wilhelm