Version: 1.0.21-9

According to
<http://stackoverflow.com/questions/2702628/gdb-cannot-find-new-threads-generic-error>,
the gdb problems are caused by scanimage's use of libpthreads.so.0 via
dlopen. Workaround that gives a much better backtrace:

$ SANE_DEBUG_DLL=3 LD_PRELOAD=/lib/libpthread.so.0 gdb --args scanimage -L
Reading symbols from /usr/bin/scanimage...(no debugging symbols found)...done.

(gdb) r
Starting program: /usr/bin/scanimage -L
[Thread debugging using libthread_db enabled]
[sanei_debug] Setting debug level of dll to 3.
[dll] sane_init: SANE dll backend version 1.0.12 from sane-backends 1.0.21
[dll] add_backend: adding backend `ls5000'
[dll] add_backend: adding backend `hpaio'
[dll] add_backend: adding backend `net'
[dll] add_backend: adding backend `abaton'
[dll] add_backend: adding backend `agfafocus'
[dll] add_backend: adding backend `apple'
[dll] add_backend: adding backend `avision'
[dll] add_backend: adding backend `artec'
[dll] add_backend: adding backend `artec_eplus48u'
[dll] add_backend: adding backend `as6e'
[dll] add_backend: adding backend `bh'
[dll] add_backend: adding backend `canon'
[dll] add_backend: adding backend `canon630u'
[dll] add_backend: adding backend `canon_dr'
[dll] add_backend: adding backend `cardscan'
[dll] add_backend: adding backend `coolscan'
[dll] add_backend: adding backend `coolscan3'
[dll] add_backend: adding backend `dell1600n_net'
[dll] add_backend: adding backend `dmc'
[dll] add_backend: adding backend `epjitsu'
[dll] add_backend: adding backend `epson2'
[dll] add_backend: adding backend `fujitsu'
[dll] add_backend: adding backend `genesys'
[dll] add_backend: adding backend `gt68xx'
[dll] add_backend: adding backend `hp'
[dll] add_backend: adding backend `hp3900'
[dll] add_backend: adding backend `hpsj5s'
[dll] add_backend: adding backend `hp3500'
[dll] add_backend: adding backend `hp4200'
[dll] add_backend: adding backend `hp5400'
[dll] add_backend: adding backend `hp5590'
[dll] add_backend: adding backend `hpljm1005'
[dll] add_backend: adding backend `hs2p'
[dll] add_backend: adding backend `ibm'
[dll] add_backend: adding backend `kodak'
[dll] add_backend: adding backend `kvs1025'
[dll] add_backend: adding backend `leo'
[dll] add_backend: adding backend `lexmark'
[dll] add_backend: adding backend `ma1509'
[dll] add_backend: adding backend `matsushita'
[dll] add_backend: adding backend `microtek'
[dll] add_backend: adding backend `microtek2'
[dll] add_backend: adding backend `mustek'
[dll] add_backend: adding backend `mustek_usb'
[dll] add_backend: adding backend `mustek_usb2'
[dll] add_backend: adding backend `nec'
[dll] add_backend: adding backend `niash'
[dll] add_backend: adding backend `pie'
[dll] add_backend: adding backend `pixma'
[dll] add_backend: adding backend `plustek'
[dll] add_backend: adding backend `qcam'
[dll] add_backend: adding backend `ricoh'
[dll] add_backend: adding backend `rts8891'
[dll] add_backend: adding backend `s9036'
[dll] add_backend: adding backend `sceptre'
[dll] add_backend: adding backend `sharp'
[dll] add_backend: adding backend `sm3600'
[dll] add_backend: adding backend `sm3840'
[dll] add_backend: adding backend `snapscan'
[dll] add_backend: adding backend `sp15c'
[dll] add_backend: adding backend `tamarack'
[dll] add_backend: adding backend `teco1'
[dll] add_backend: adding backend `teco2'
[dll] add_backend: adding backend `teco3'
[dll] add_backend: adding backend `u12'
[dll] add_backend: adding backend `umax'
[dll] add_backend: adding backend `umax1220u'
[dll] add_backend: adding backend `v4l'
[dll] add_backend: adding backend `xerox_mfp'
[dll] sane_get_devices
[dll] load: searching backend `xerox_mfp' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-xerox_mfp.so.1'
[dll] init: initializing backend `xerox_mfp'
[dll] load: searching backend `v4l' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-v4l.so.1'
[dll] init: initializing backend `v4l'
[dll] load: searching backend `umax1220u' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-umax1220u.so.1'
[dll] init: initializing backend `umax1220u'
[dll] load: searching backend `umax' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-umax.so.1'
[dll] init: initializing backend `umax'
[dll] load: searching backend `u12' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-u12.so.1'
[dll] init: initializing backend `u12'
[dll] load: searching backend `teco3' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco3.so.1'
[dll] init: initializing backend `teco3'
[dll] load: searching backend `teco2' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco2.so.1'
[dll] init: initializing backend `teco2'
[dll] load: searching backend `teco1' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-teco1.so.1'
[dll] init: initializing backend `teco1'
[dll] load: searching backend `tamarack' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-tamarack.so.1'
[dll] init: initializing backend `tamarack'
[dll] load: searching backend `sp15c' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sp15c.so.1'
[dll] init: initializing backend `sp15c'
[dll] load: searching backend `snapscan' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-snapscan.so.1'
[dll] init: initializing backend `snapscan'
[dll] load: searching backend `sm3840' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sm3840.so.1'
[dll] init: initializing backend `sm3840'
[dll] load: searching backend `sm3600' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sm3600.so.1'
[dll] init: initializing backend `sm3600'
[dll] load: searching backend `sharp' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sharp.so.1'
[dll] init: initializing backend `sharp'
[dll] load: searching backend `sceptre' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-sceptre.so.1'
[dll] init: initializing backend `sceptre'
[dll] load: searching backend `s9036' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-s9036.so.1'
[dll] init: initializing backend `s9036'
[dll] load: searching backend `rts8891' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-rts8891.so.1'
[dll] init: initializing backend `rts8891'
[dll] load: searching backend `ricoh' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ricoh.so.1'
[dll] init: initializing backend `ricoh'
[dll] load: searching backend `qcam' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-qcam.so.1'
[dll] init: initializing backend `qcam'
[dll] load: searching backend `plustek' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-plustek.so.1'
[dll] init: initializing backend `plustek'
[dll] load: searching backend `pixma' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-pixma.so.1'
[dll] init: initializing backend `pixma'
[dll] load: searching backend `pie' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-pie.so.1'
[dll] init: initializing backend `pie'
[dll] load: searching backend `niash' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-niash.so.1'
[dll] init: initializing backend `niash'
[dll] load: searching backend `nec' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-nec.so.1'
[dll] init: initializing backend `nec'
[dll] load: searching backend `mustek_usb2' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-mustek_usb2.so.1'
[dll] init: initializing backend `mustek_usb2'
[dll] load: searching backend `mustek_usb' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-mustek_usb.so.1'
[dll] init: initializing backend `mustek_usb'
[dll] load: searching backend `mustek' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-mustek.so.1'
[dll] init: initializing backend `mustek'
[dll] load: searching backend `microtek2' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-microtek2.so.1'
[dll] init: initializing backend `microtek2'
[dll] load: searching backend `microtek' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-microtek.so.1'
[dll] init: initializing backend `microtek'
[dll] load: searching backend `matsushita' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-matsushita.so.1'
[dll] init: initializing backend `matsushita'
[dll] load: searching backend `ma1509' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ma1509.so.1'
[dll] init: initializing backend `ma1509'
[dll] load: searching backend `lexmark' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-lexmark.so.1'
[dll] init: initializing backend `lexmark'
[dll] load: searching backend `leo' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-leo.so.1'
[dll] init: initializing backend `leo'
[dll] load: searching backend `kvs1025' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-kvs1025.so.1'
[dll] init: initializing backend `kvs1025'
[dll] load: searching backend `kodak' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-kodak.so.1'
[dll] init: initializing backend `kodak'
[dll] load: searching backend `ibm' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ibm.so.1'
[dll] init: initializing backend `ibm'
[dll] load: searching backend `hs2p' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hs2p.so.1'
[dll] init: initializing backend `hs2p'
[dll] load: searching backend `hpljm1005' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hpljm1005.so.1'
[dll] init: initializing backend `hpljm1005'
[dll] load: searching backend `hp5590' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp5590.so.1'
[dll] init: initializing backend `hp5590'
[dll] load: searching backend `hp5400' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp5400.so.1'
[dll] init: initializing backend `hp5400'
[dll] load: searching backend `hp4200' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp4200.so.1'
[dll] init: initializing backend `hp4200'
[dll] load: searching backend `hp3500' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp3500.so.1'
[dll] init: initializing backend `hp3500'
[dll] load: searching backend `hpsj5s' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hpsj5s.so.1'
[dll] init: initializing backend `hpsj5s'
[dll] load: searching backend `hp3900' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp3900.so.1'
[dll] init: initializing backend `hp3900'
[dll] load: searching backend `hp' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hp.so.1'
[dll] init: initializing backend `hp'
[dll] load: searching backend `gt68xx' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-gt68xx.so.1'
[dll] init: initializing backend `gt68xx'
[dll] load: searching backend `genesys' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-genesys.so.1'
[dll] init: initializing backend `genesys'
[dll] load: searching backend `fujitsu' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-fujitsu.so.1'
[dll] init: initializing backend `fujitsu'
[dll] load: searching backend `epson2' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-epson2.so.1'
[dll] init: initializing backend `epson2'
[dll] load: searching backend `epjitsu' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-epjitsu.so.1'
[dll] init: initializing backend `epjitsu'
[dll] load: searching backend `dmc' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-dmc.so.1'
[dll] init: initializing backend `dmc'
[dll] load: searching backend `dell1600n_net' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-dell1600n_net.so.1'
[dll] init: initializing backend `dell1600n_net'
[dll] load: searching backend `coolscan3' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-coolscan3.so.1'
[dll] init: initializing backend `coolscan3'
[dll] load: searching backend `coolscan' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-coolscan.so.1'
[dll] init: initializing backend `coolscan'
[dll] load: searching backend `cardscan' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-cardscan.so.1'
[dll] init: initializing backend `cardscan'
[dll] load: searching backend `canon_dr' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-canon_dr.so.1'
[dll] init: initializing backend `canon_dr'
[dll] load: searching backend `canon630u' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-canon630u.so.1'
[dll] init: initializing backend `canon630u'
[dll] load: searching backend `canon' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-canon.so.1'
[dll] init: initializing backend `canon'
[dll] load: searching backend `bh' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-bh.so.1'
[dll] init: initializing backend `bh'
[dll] load: searching backend `as6e' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-as6e.so.1'
[dll] init: initializing backend `as6e'
[dll] load: searching backend `artec_eplus48u' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-artec_eplus48u.so.1'
[dll] init: initializing backend `artec_eplus48u'
[dll] load: searching backend `artec' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-artec.so.1'
[dll] init: initializing backend `artec'
[dll] load: searching backend `avision' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-avision.so.1'
[dll] init: initializing backend `avision'
[dll] load: searching backend `apple' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-apple.so.1'
[dll] init: initializing backend `apple'
[dll] load: searching backend `agfafocus' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-agfafocus.so.1'
[dll] init: initializing backend `agfafocus'
[dll] load: searching backend `abaton' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-abaton.so.1'
[dll] init: initializing backend `abaton'
[dll] load: searching backend `net' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-net.so.1'
[dll] init: initializing backend `net'
[New Thread 0x7fffeca0a700 (LWP 18984)]
[dll] load: searching backend `hpaio' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-hpaio.so.1'
[dll] init: initializing backend `hpaio'
[dll] load: searching backend `ls5000' in `/usr/lib/sane'
[dll] load: dlopen()ing `/usr/lib/sane/libsane-ls5000.so.1'
[dll] init: initializing backend `ls5000'
[dll] sane_get_devices: found 1 devices
device `net:localhost:hpaio:/usb/officejet_4200_series?serial=CN5A5GI0XY' is a 
Hewlett-Packard officejet_4200_series all-in-one
[dll] sane_exit: exiting
[dll] sane_exit: calling backend `xerox_mfp's exit function
[dll] sane_exit: calling backend `v4l's exit function
[dll] sane_exit: calling backend `umax1220u's exit function
[dll] sane_exit: calling backend `umax's exit function
[dll] sane_exit: calling backend `u12's exit function
[dll] sane_exit: calling backend `teco3's exit function
[dll] sane_exit: calling backend `teco2's exit function
[dll] sane_exit: calling backend `teco1's exit function
[dll] sane_exit: calling backend `tamarack's exit function
[dll] sane_exit: calling backend `sp15c's exit function
[dll] sane_exit: calling backend `snapscan's exit function
[dll] sane_exit: calling backend `sm3840's exit function
[dll] sane_exit: calling backend `sm3600's exit function
[dll] sane_exit: calling backend `sharp's exit function
[dll] sane_exit: calling backend `sceptre's exit function
[dll] sane_exit: calling backend `s9036's exit function
[dll] sane_exit: calling backend `rts8891's exit function
[dll] sane_exit: calling backend `ricoh's exit function
[dll] sane_exit: calling backend `qcam's exit function
[dll] sane_exit: calling backend `plustek's exit function
[dll] sane_exit: calling backend `pixma's exit function
[dll] sane_exit: calling backend `pie's exit function
[dll] sane_exit: calling backend `niash's exit function
[dll] sane_exit: calling backend `nec's exit function
[dll] sane_exit: calling backend `mustek_usb2's exit function
[dll] sane_exit: calling backend `mustek_usb's exit function
[dll] sane_exit: calling backend `mustek's exit function
[dll] sane_exit: calling backend `microtek2's exit function
[dll] sane_exit: calling backend `microtek's exit function
[dll] sane_exit: calling backend `matsushita's exit function
[dll] sane_exit: calling backend `ma1509's exit function
[dll] sane_exit: calling backend `lexmark's exit function
[dll] sane_exit: calling backend `leo's exit function
[dll] sane_exit: calling backend `kvs1025's exit function
[dll] sane_exit: calling backend `kodak's exit function
[dll] sane_exit: calling backend `ibm's exit function
[dll] sane_exit: calling backend `hs2p's exit function
[dll] sane_exit: calling backend `hpljm1005's exit function
[dll] sane_exit: calling backend `hp5590's exit function
[dll] sane_exit: calling backend `hp5400's exit function
[dll] sane_exit: calling backend `hp4200's exit function
[dll] sane_exit: calling backend `hp3500's exit function
[dll] sane_exit: calling backend `hpsj5s's exit function
[dll] sane_exit: calling backend `hp3900's exit function
[dll] sane_exit: calling backend `hp's exit function
[dll] sane_exit: calling backend `gt68xx's exit function
[dll] sane_exit: calling backend `genesys's exit function
[dll] sane_exit: calling backend `fujitsu's exit function
[dll] sane_exit: calling backend `epson2's exit function
[dll] sane_exit: calling backend `epjitsu's exit function
[dll] sane_exit: calling backend `dmc's exit function
[dll] sane_exit: calling backend `dell1600n_net's exit function
[dll] sane_exit: calling backend `coolscan3's exit function
[dll] sane_exit: calling backend `coolscan's exit function
[dll] sane_exit: calling backend `cardscan's exit function
[dll] sane_exit: calling backend `canon_dr's exit function
[dll] sane_exit: calling backend `canon630u's exit function
[dll] sane_exit: calling backend `canon's exit function
[dll] sane_exit: calling backend `bh's exit function
[dll] sane_exit: calling backend `artec_eplus48u's exit function
[dll] sane_exit: calling backend `artec's exit function
[dll] sane_exit: calling backend `avision's exit function
[dll] sane_exit: calling backend `apple's exit function
[dll] sane_exit: calling backend `agfafocus's exit function
[dll] sane_exit: calling backend `abaton's exit function
[dll] sane_exit: calling backend `net's exit function

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffeca0a700 (LWP 18984)]
0x00007fffeca2fe91 in ?? () from /usr/lib/libdbus-1.so.3

(gdb) where
#0  0x00007fffeca2fe91 in ?? () from /usr/lib/libdbus-1.so.3
#1  0x00007fffeca1a22a in dbus_connection_dispatch () from 
/usr/lib/libdbus-1.so.3
#2  0x00007fffecc558b6 in dispatch_timeout_callback (t=<value optimized out>, 
userdata=0x6577c0) at ../avahi-common/dbus-watch-glue.c:107
#3  0x00007fffece619c8 in avahi_simple_poll_dispatch (s=0x657090) at 
simple-watch.c:562
#4  0x00007fffece61f5d in avahi_simple_poll_loop (s=0x657090) at 
simple-watch.c:638
#5  0x00007fffece62aae in thread (userdata=0x657040) at thread-watch.c:73
#6  0x00007ffff7bc98ba in start_thread (arg=<value optimized out>) at 
pthread_create.c:300
#7  0x00007ffff752602d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

(gdb) info threads
* 2 Thread 0x7fffeca0a700 (LWP 18984)  0x00007fffeca2fe91 in ?? () from 
/usr/lib/libdbus-1.so.3
  1 Thread 0x7ffff7fe4700 (LWP 18981)  0x00007ffff7bd105d in write () at 
../sysdeps/unix/syscall-template.S:82
Current language:  auto
The current source language is "auto; currently asm".

(gdb) thread apply all bt full

Thread 2 (Thread 0x7fffeca0a700 (LWP 18984)):
#0  0x00007fffeca2fe91 in ?? () from /usr/lib/libdbus-1.so.3
No symbol table info available.
#1  0x00007fffeca1a22a in dbus_connection_dispatch () from 
/usr/lib/libdbus-1.so.3
No symbol table info available.
#2  0x00007fffecc558b6 in dispatch_timeout_callback (t=<value optimized out>, 
userdata=0x6577c0) at ../avahi-common/dbus-watch-glue.c:107
        __PRETTY_FUNCTION__ =           "dispatch_timeout_callback"
#3  0x00007fffece619c8 in avahi_simple_poll_dispatch (s=0x657090) at 
simple-watch.c:562
        next_timeout = 0x657500
        w = <value optimized out>
        __PRETTY_FUNCTION__ =           "avahi_simple_poll_dispatch"
#4  0x00007fffece61f5d in avahi_simple_poll_loop (s=0x657090) at 
simple-watch.c:638
        r = 0
        __PRETTY_FUNCTION__ =           "avahi_simple_poll_loop"
#5  0x00007fffece62aae in thread (userdata=0x657040) at thread-watch.c:73
        mask = {
          __val =             {18446744067267100671,
            18446744073709551615 <repeats 15 times>}
        }
#6  0x00007ffff7bc98ba in start_thread (arg=<value optimized out>) at 
pthread_create.c:300
        __res = <value optimized out>
        pd = 0x7fffeca0a700
        unwind_buf = {
          cancel_jmp_buf =             {{
              jmp_buf =                 {140737163339520,
                458121095721482401,
                140737349762848,
                0,
                140737354125376,
                3,
                -458157747864110943,
                -458102944146425695}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad =               {0x0,
              0x0,
              0x0,
              0x0}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 0
            }
          }
        }
        not_first_call = <value optimized out>
        freesize = <value optimized out>
        __PRETTY_FUNCTION__ =           "start_thread"
#7  0x00007ffff752602d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#8  0x0000000000000000 in ?? ()
No symbol table info available.

Thread 1 (Thread 0x7ffff7fe4700 (LWP 18981)):
#0  0x00007ffff7bd105d in write () at ../sysdeps/unix/syscall-template.S:82
No locals.
#1  0x00007fffed06c28d in sanei_w_space () from /usr/lib/sane/libsane-net.so.1
No symbol table info available.
#2  0x00007fffed06c518 in ?? () from /usr/lib/sane/libsane-net.so.1
No symbol table info available.
#3  0x00007fffed06c582 in sanei_w_set_dir () from /usr/lib/sane/libsane-net.so.1
No symbol table info available.
#4  0x00007fffed06c708 in sanei_w_call () from /usr/lib/sane/libsane-net.so.1
No symbol table info available.
#5  0x00007fffed06f463 in sane_net_exit () from /usr/lib/sane/libsane-net.so.1
No symbol table info available.
#6  0x00007ffff79c068a in sane_dll_exit () from /usr/lib/libsane.so.1
No symbol table info available.
#7  0x0000000000406029 in ?? ()
No symbol table info available.
#8  0x00007ffff748d5e2 in __run_exit_handlers (status=0, listp=0x7ffff77b24a8, 
run_list_atexit=true) at exit.c:78
        atfct = <value optimized out>
        onfct = <value optimized out>
        cxafct = 0x4
#9  0x00007ffff748d635 in *__GI_exit (status=8) at exit.c:100
No locals.
#10 0x00000000004038c0 in ?? ()
No symbol table info available.
#11 0x00007ffff7475c4d in __libc_start_main (main=<value optimized out>, 
argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized 
out>, fini=<value optimized out>, rtld_fini=<value optimized out>, 
stack_end=0x7fffffffe5b8) at libc-start.c:228
        result = <value optimized out>
        unwind_buf = {
          cancel_jmp_buf =             {{
              jmp_buf =                 {0,
                458121095721482401,
                4200816,
                140737488348608,
                0,
                0,
                -458121095888275295,
                -458104668459403103}, 
              mask_was_saved = 0
            }}, 
          priv = {
            pad =               {0x0,
              0x0,
              0x407bc0,
              0x7fffffffe5c8}, 
            data = {
              prev = 0x0, 
              cleanup = 0x0, 
              canceltype = 4225984
            }
          }
        }
        not_first_call = <value optimized out>
#12 0x0000000000401999 in ?? ()
No symbol table info available.
#13 0x00007fffffffe5b8 in ?? ()
No symbol table info available.
#14 0x000000000000001c in ?? ()
No symbol table info available.
#15 0x0000000000000002 in ?? ()
No symbol table info available.
#16 0x00007fffffffe865 in ?? ()
No symbol table info available.
#17 0x00007fffffffe878 in ?? ()
No symbol table info available.
#18 0x0000000000000000 in ?? ()
No symbol table info available.





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