[sane-devel] sane-backends (eposn2) segfaults pretty much all the time
m. allan noah
kitno455 at gmail.com
Thu Oct 3 11:12:41 UTC 2013
I would recommend that you use git bisect (or a manual equivalent) to
find the commit that breaks epson2. Then we can investigate a fix.
allan
On Thu, Oct 3, 2013 at 5:32 AM, Johannes Bauer <dfnsonfsduifb at gmx.de> wrote:
> Hi list,
>
> I have two scanners, one that uses the epson2 backend and a nex ScanSnap
> ix500 which uses the fujitsu. For the newer ix500 I needed a fairly
> recent version, so I'm currently using git head of sane-backends. This
> report concerns 472daf78.
>
> First note: the epson2 backend doesn't compile, because the pedantic
> setup forces C90 and mixed declarations and code are C99. Change
> concerns backend/epson2-ops.c line 234 where I simply created a new
> scope before the declaration/initialization of "int last" until line
> 256. Then it compiles.
>
> However, it continuously blows up in my face with segfaults:
>
> $ scanimage --resolution 150 --mode Gray
> scanimage: output is not a file, exiting
> Segmentation fault
>
> $ scanimage --help
> Usage: scanimage [OPTION]...
>
> Start image acquisition on a scanner device and write image data to
> standard output.
> [...]
> Options specific to device `epson2:libusb:001:008':
> Scan Mode:
> --mode Lineart|Gray|Color [Lineart]
> [...]
>
> Type ``scanimage --help -d DEVICE'' to get list of all options for DEVICE.
>
> List of available devices:
> Segmentation fault
>
> This here starts scanning a complete document, actually creates a file,
> then outputs some broken debug output (control character is outputted)
> and then hangs (never exits):
> $ scanimage --resolution 150 --mode Gray >x
> [Some weird CTRL char]libusb: 0.000000 warning [libusb_close] internal
> signalling read failed, closing anyway
> libusb: 0.000019 error [do_close] Device handle closed while transfer
> was still being processed, but the device is still connected as far as
> we know
> libusb: 0.000026 error [do_close] A cancellation hasn't even been
> scheduled on the transfer for which the device is closing
>
> After I abort the hang with Ctrl-C, the scanner isn't recognized anymore
> and I need to plug it out and into USB again.
>
> Tracing the segfault for this command:
> $ /usr/local/bin/scanimage --resolution 150 --mode Gray
>
> yields:
>
> #0 0x00007ffff4bd48c3 in libusb_submit_transfer () from
> /usr/lib64/libusb-1.0.so.0
> #1 0x00007ffff4bd600f in do_sync_bulk_transfer () from
> /usr/lib64/libusb-1.0.so.0
> #2 0x00007ffff4bd6384 in libusb_bulk_transfer () from
> /usr/lib64/libusb-1.0.so.0
> #3 0x00007ffff67fbf66 in usb_bulk_io.isra.1 () from
> /usr/lib64/libusb-0.1.so.4
> #4 0x00007ffff7bb93ae in sanei_usb_write_bulk (dn=0,
> buffer=0x7fffffffb760 "\033Fz\365\377\177", size=0x7fffffffb708) at
> sanei_usb.c:2433
> #5 0x00007ffff42a3f3e in e2_send (s=0x627580, buf=0x7fffffffb760,
> buf_size=2, reply_len=4, status=0x7fffffffb75c) at epson2-io.c:99
> #6 0x00007ffff42a522d in esci_request_status (handle=0x627580,
> scanner_status=0x0) at epson2-commands.c:394
> #7 0x00007ffff429ffc2 in close_scanner (s=0x627580) at epson2.c:365
> #8 0x00007ffff42a2214 in sane_epson2_close (handle=0x627580) at
> epson2.c:1545
> #9 0x00007ffff7bcb234 in sane_dll_close (handle=0x618710) at dll.c:1223
> #10 0x0000000000405d6d in scanimage_exit () at scanimage.c:1654
> #11 0x00007ffff5445721 in __run_exit_handlers (status=1,
> listp=0x7ffff57ad5a8 <__exit_funcs>, run_list_atexit=true) at exit.c:78
> #12 0x00007ffff54457a5 in __GI_exit (status=<optimized out>) at exit.c:100
> #13 0x0000000000402ad3 in main (argc=<optimized out>,
> argv=0x7fffffffd9f8) at scanimage.c:2040
>
> The backtrace with the appropriate code:
>
> (gdb) up
> #1 0x00007ffff4bd600f in do_sync_bulk_transfer () from
> /usr/lib64/libusb-1.0.so.0
> (gdb) up
> #2 0x00007ffff4bd6384 in libusb_bulk_transfer () from
> /usr/lib64/libusb-1.0.so.0
> (gdb) up
> #3 0x00007ffff67fbf66 in usb_bulk_io.isra.1 () from
> /usr/lib64/libusb-0.1.so.4
> (gdb) up
> #4 0x00007ffff7bb93ae in sanei_usb_write_bulk (dn=0,
> buffer=0x7fffffffb820 "\033Fz\365\377\177", size=0x7fffffffb7c8) at
> sanei_usb.c:2433
> 2433 write_size = usb_bulk_write (devices[dn].libusb_handle,
> (gdb) up
> #5 0x00007ffff42a3f3e in e2_send (s=0x627580, buf=0x7fffffffb820,
> buf_size=2, reply_len=4, status=0x7fffffffb81c) at epson2-io.c:99
> 99 *status = sanei_usb_write_bulk(s->fd, buf, &n);
> (gdb) up
> #6 0x00007ffff42a522d in esci_request_status (handle=0x627580,
> scanner_status=0x0) at epson2-commands.c:394
> 394 e2_send(s, params, 2, 4, &status);
> (gdb) up
> #7 0x00007ffff429ffc2 in close_scanner (s=0x627580) at epson2.c:365
> 365 esci_request_status(s, NULL);
> (gdb) up
> #8 0x00007ffff42a2214 in sane_epson2_close (handle=0x627580) at
> epson2.c:1545
> 1545 close_scanner(s);
> (gdb) up
> #9 0x00007ffff7bcb234 in sane_dll_close (handle=0x618710) at dll.c:1223
> 1223 (*(op_close_t)s->be->op[OP_CLOSE]) (s->handle);
> (gdb) up
> #10 0x0000000000405d6d in scanimage_exit () at scanimage.c:1654
> 1654 sane_close (device);
> (gdb) up
> #11 0x00007ffff5445721 in __run_exit_handlers (status=1,
> listp=0x7ffff57ad5a8 <__exit_funcs>, run_list_atexit=true) at exit.c:78
> 78 cxafct (f->func.cxa.arg, status);
> (gdb) up
> #12 0x00007ffff54457a5 in __GI_exit (status=<optimized out>) at exit.c:100
> 100 __run_exit_handlers (status, &__exit_funcs, true);
> (gdb) up
> #13 0x0000000000402ad3 in main (argc=<optimized out>,
> argv=0x7fffffffdab8) at scanimage.c:2040
> 2040 exit (1);
>
> If there's anything I could do to further trace this problem, please let
> me know. It would be awesome to have a sane backends version that works
> with both scanners, not just one or the other :-(
>
> Best regards,
> Johannes
>
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