(gdb) bt
#0  0x08062e81 in ast_channel_spy_remove (chan=0x81a8750, spy=0xb70eb7f8) at channel.c:1044
#1  0xb74ca84e in stop_spying (chan=0x81a8750, spy=0xb70eb7f8) at app_chanspy.c:220
#2  0xb74cad4a in channel_spy (chan=0x81bc4d0, spyee=0x81a8750, volfactor=0xb70ebb98, fd=0)
    at app_chanspy.c:340
#3  0xb74cb9fb in chanspy_exec (chan=0x81bc4d0, data=0xb70f0048) at app_chanspy.c:516
#4  0x0808bb49 in pbx_exec (c=0x81bc4d0, app=0x8196330, data=0xb70f0048, newstack=1) at pbx.c:544
#5  0x0808fb2e in pbx_extension_helper (c=0x81bc4d0, con=0x0, context=0x81bc620 "default",
    exten=0x81bc714 "3", priority=1, label=0x0, callerid=0x819bf88 "Test3", action=1) at pbx.c:1687
#6  0x08091061 in ast_spawn_extension (c=0x81bc4d0, context=0x81bc620 "default", exten=0x81bc714 "3",
    priority=1, callerid=0x819bf88 "Test3") at pbx.c:2220
#7  0x0809157b in __ast_pbx_run (c=0x81bc4d0) at pbx.c:2286
#8  0x080925b6 in pbx_thread (data=0x81bc4d0) at pbx.c:2507
#9  0xb7fc3361 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#10 0xb7eb1bde in clone () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt full
#0  0x08062e81 in ast_channel_spy_remove (chan=0x81a8750, spy=0xb70eb7f8) at channel.c:1044
        curelm = (struct ast_channel_spy *) 0x0
        f = (struct ast_frame *) 0xb70eb764
        __PRETTY_FUNCTION__ = "ast_channel_spy_remove"
#1  0xb74ca84e in stop_spying (chan=0x81a8750, spy=0xb70eb7f8) at app_chanspy.c:220
No locals.
#2  0xb74cad4a in channel_spy (chan=0x81bc4d0, spyee=0x81a8750, volfactor=0xb70ebb98, fd=0)
    at app_chanspy.c:340
        csth = {spy = {list = {next = 0x0}, lock = {__m_reserved = 0, __m_count = 0, __m_owner = 0x0,
      __m_kind = 1, __m_lock = {__status = 0, __spinlock = 0}}, trigger = {__c_lock = {__status = 0,
        __spinlock = 0}, __c_waiting = 0x0, __padding = '\0' <repeats 27 times>, __align = 0},
    read_queue = {head = 0x0, samples = 0, format = 64}, write_queue = {head = 0x0, samples = 0,
      format = 64}, flags = 57, status = CHANSPY_RUNNING, type = 0xb74cbe9e "ChanSpy",
    read_vol_adjustment = 0, write_vol_adjustment = 0}, fd = 0, volfactor = 0}
        running = 1
        res = 1
        x = 0
        inp = '\0' <repeats 23 times>
        name = 0xb70eb780 "SIP/Test1-d949"
        f = (struct ast_frame *) 0x0
#3  0xb74cb9fb in chanspy_exec (chan=0x81bc4d0, data=0xb70f0048) at app_chanspy.c:516
        x = 7
        group = 0x0
        igrp = 1
        u = (struct localuser *) 0x8164fa8
        peer = (struct ast_channel *) 0x81a8750
        prev = (struct ast_channel *) 0x81a8750
        name = '\0' <repeats 255 times>
        peer_name = "spy-sip\000Test1-d949", '\0' <repeats 242 times>
        args = 0xb70eb8d0 "SIP/Test1"
        ptr = 0xb70ebbbb "Test1-d949"
        options = 0xb70eb8da "b"
        spec = 0xb70eb8d0 "SIP/Test1"
        argv = {0xb70eb8d0 "SIP/Test1", 0xb70eb8da "b", 0x0, 0x0, 0x0}
---Type <return> to continue, or q <return> to quit---
        mygroup = 0x0
        recbase = 0x0
        res = 0
        volfactor = 0
        silent = 0
        argc = 2
        bronly = 2
        chosen = 0
        count = 1
        waitms = 100
        num = 0
        oldrf = 4
        oldwf = 4
        fd = 0
        flags = {flags = 2}
        zero_volume = 0 '\0'
        __PRETTY_FUNCTION__ = "chanspy_exec"
#4  0x0808bb49 in pbx_exec (c=0x81bc4d0, app=0x8196330, data=0xb70f0048, newstack=1) at pbx.c:544
        res = 134790235
        saved_c_appl = 0x0
        saved_c_data = 0x0
        execute = (int (*)(struct ast_channel *, void *)) 0xb74cadf0 <chanspy_exec>
        __PRETTY_FUNCTION__ = "pbx_exec"
#5  0x0808fb2e in pbx_extension_helper (c=0x81bc4d0, con=0x0, context=0x81bc620 "default",
    exten=0x81bc714 "3", priority=1, label=0x0, callerid=0x819bf88 "Test3", action=1) at pbx.c:1687
        e = (struct ast_exten *) 0x819d990
        app = (struct ast_app *) 0x8196330
        sw = (struct ast_switch *) 0x0
        data = 0x0
        foundcontext = 0x81bc620 "default"
        newstack = 1
        res = 0
        status = 5
        incstack = {0x0 <repeats 18 times>, 0xb7e491a4 "\201&#65533;\237\f", 0x0, 0x0,
---Type <return> to continue, or q <return> to quit---
  0xb7f130dc "<\236\022",
  0xb70f20f0 "\001\200L\"\017L\"\017L\"\017L\"\017[\"\017\233\"\017L\"\017\233\"\017",
  0xb70f20cc "&#65533;\017H&#65533; \017&#65533;020\b\024\"\017L\"\017",
  0xb7e4a4a1 "\211~\020\213U\024\211~\f\211~\004\205&#65533;6\213U\024\213}&#65533;211V\024\211V\b1&#65533;211~\030\211\226\230",
  0xb70f20f0 "\001\200L\"\017L\"\017L\"\017L\"\017[\"\017\233\"\017L\"\017\233\"\017",
  0xb70f224c " &#65533;033\b", 0xb70f229b "\b\001", 0x0, 0xb70f229b "\b\001", 0xb7f130dc "<\236\022",
  0x810d6a5 "\"%s\" <%s>", 0xb70f220c "`z\025\b\210\031\b", 0xb70f21dc "!\017B&#65533;L\"\017P",
  0xb7e448a6 "\213\215\f\211&#65533;\2150t\t\213(&#65533;006",
  0xb70f20f0 "\001\200L\"\017L\"\017L\"\017L\"\017[\"\017\233\"\017L\"\017\233\"\017",
  0x810d6a5 "\"%s\" <%s>", 0xb70f2214 "", 0xb70f224c " &#65533;033\b", 0x0, 0xb70f2190 "",
  0xb70f20f0 "\001\200L\"\017L\"\017L\"\017L\"\017[\"\017\233\"\017L\"\017\233\"\017",
  0xfbad8001 <Address 0xfbad8001 out of bounds>, 0xb70f224c " &#65533;033\b", 0xb70f224c " &#65533;033\b",
  0xb70f224c " &#65533;033\b", 0xb70f224c " &#65533;033\b", 0xb70f225b "\b0c\031\b\001", 0xb70f229b "\b\001",
  0xb70f224c " &#65533;033\b", 0xb70f229b "\b\001", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
  0xb7000000 <Address 0xb7000000 out of bounds>, 0x0, 0x0, 0x0, 0x0, 0x0,
  0xffffffff <Address 0xffffffff out of bounds>, 0xb7f064dd "corrupted double-linked list",
  0xb7f064dd "corrupted double-linked list", 0xb7f064dd "corrupted double-linked list", 0x0, 0x0,
  0x0, 0x0, 0x0, 0x68 <Address 0x68 out of bounds>, 0x18 <Address 0x18 out of bounds>, 0xb7f14938 "",
  0x0, 0xb7f14924 "", 0xb7f12b20 "", 0x0, 0x0, 0x0, 0x0, 0x0, 0xb7f130dc "<\236\022", 0xb7f14900 "",
  0x0, 0xb70f226c "H",
  0xb7e4c5d3 "&#65533;\213\215\\9A\004&#65533;022\213\225\\\213r\b9F\004\211\\w&#65533;213\205\\\213p\f&#65533;222\201}&#65533;\001", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x81cbaf0 "4", 0xb7e4c334 "\201èm\f",
  0xb7f130dc "<\236\022", 0x0, 0xb70f2bb0 "+\017&#65533;033\b+\017\001",
  0xb70f21f8 "&#65533;\017G\n\b&#65533;033\b\200&#65533;033\b\024",
  0xb7e2c742 "\203&#65533;020[]&#65533;220\220\220\220\220\220\220\220U\211&#65533;215M\020S\203&#65533;f\213U\f\211L$\b\213E\b&#65533;206\025\201&#65533;i\016", 0xb70f224c " &#65533;033\b", 0x50 <Address 0x50 out of bounds>,
  0x810d6a5 "\"%s\" <%s>", 0xb70f220c "`z\025\b\210\031\b", 0xb7fcd414 "&#65533;", 0xb70f24c8 "",
  0x80af947 "\213\204$", 0x81bcba4 "", 0x81bc880 "", 0x14 <Address 0x14 out of bounds>,
  0x8157a60 "Test3", 0x819bf88 "Test3", 0x0, 0x0, 0x0, 0x810d5d9 "<unknown>", 0x819bf88 "Test3",
  0x819bf88 "Test3", 0xb70f24c8 "", 0xb70f2280 "&#65533;\033\b", 0x0,
  0xb7e66196 "\211&#65533;\001&#65533;s\001&#65533;N\b",
  0x80d3fa8 "\213D$\020\213T$\024\211\003\211S\004\211&#65533;203&#65533;030[&#65533;004", 0xb70f2250 "", 0x0}
        passdata = "SIP/Test1|b", '\0' <repeats 8180 times>
---Type <return> to continue, or q <return> to quit---
        stacklen = 0
        tmp = "\033[1;36;40mChanSpy\033[0;37;40m", '\0' <repeats 52 times>
        tmp2 = "\033[1;35;40mSIP/Test3-c02c\033[0;37;40m", '\0' <repeats 45 times>
        tmp3 = "\033[1;35;40mSIP/Test1|b\033[0;37;40m", '\0' <repeats 8160 times>
        atmp = '\0' <repeats 79 times>
        atmp2 = '\0' <repeats 8291 times>
        __PRETTY_FUNCTION__ = "pbx_extension_helper"
#6  0x08091061 in ast_spawn_extension (c=0x81bc4d0, context=0x81bc620 "default", exten=0x81bc714 "3",
    priority=1, callerid=0x819bf88 "Test3") at pbx.c:2220
No locals.
#7  0x0809157b in __ast_pbx_run (c=0x81bc4d0) at pbx.c:2286
        firstpass = 1
        digit = 0
        exten = '\0' <repeats 255 times>
        pos = 0
        waittime = 0
        res = 0
        autoloopflag = 0
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#8  0x080925b6 in pbx_thread (data=0x81bc4d0) at pbx.c:2507
        c = (struct ast_channel *) 0x81bc4d0
#9  0xb7fc3361 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#10 0xb7eb1bde in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.



Just in case I repeated the process and generated the backtrace again, hope it helps:
(gdb) bt
#0  0x08062e81 in ast_channel_spy_remove (chan=0x81ae5d0, spy=0xb70b97f8) at channel.c:1044
#1  0xb747584e in stop_spying (chan=0x81ae5d0, spy=0xb70b97f8) at app_chanspy.c:220
#2  0xb7475d4a in channel_spy (chan=0x81bbca0, spyee=0x81ae5d0, volfactor=0xb70b9b98, fd=0)
    at app_chanspy.c:340
#3  0xb74769fb in chanspy_exec (chan=0x81bbca0, data=0xb70be048) at app_chanspy.c:516
#4  0x0808bb49 in pbx_exec (c=0x81bbca0, app=0x8196328, data=0xb70be048, newstack=1) at pbx.c:544
#5  0x0808fb2e in pbx_extension_helper (c=0x81bbca0, con=0x0, context=0x81bbdf0 "default",
    exten=0x81bbee4 "3", priority=1, label=0x0, callerid=0x8159df8 "Test3", action=1) at pbx.c:1687
#6  0x08091061 in ast_spawn_extension (c=0x81bbca0, context=0x81bbdf0 "default", exten=0x81bbee4 "3",
    priority=1, callerid=0x8159df8 "Test3") at pbx.c:2220
#7  0x0809157b in __ast_pbx_run (c=0x81bbca0) at pbx.c:2286
#8  0x080925b6 in pbx_thread (data=0x81bbca0) at pbx.c:2507
#9  0xb7f6e361 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#10 0xb7e5cbde in clone () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt full
#0  0x08062e81 in ast_channel_spy_remove (chan=0x81ae5d0, spy=0xb70b97f8) at channel.c:1044
        curelm = (struct ast_channel_spy *) 0x0
        f = (struct ast_frame *) 0xb70b9764
        __PRETTY_FUNCTION__ = "ast_channel_spy_remove"
#1  0xb747584e in stop_spying (chan=0x81ae5d0, spy=0xb70b97f8) at app_chanspy.c:220
No locals.
#2  0xb7475d4a in channel_spy (chan=0x81bbca0, spyee=0x81ae5d0, volfactor=0xb70b9b98, fd=0)
    at app_chanspy.c:340
        csth = {spy = {list = {next = 0xb70b97f8}, lock = {__m_reserved = 0, __m_count = 0,
      __m_owner = 0x0, __m_kind = 1, __m_lock = {__status = 0, __spinlock = 0}}, trigger = {
      __c_lock = {__status = 0, __spinlock = 0}, __c_waiting = 0x0,
      __padding = '\0' <repeats 27 times>, __align = 0}, read_queue = {head = 0x0, samples = 0,
      format = 64}, write_queue = {head = 0x0, samples = 0, format = 64}, flags = 57,
    status = CHANSPY_RUNNING, type = 0xb7476e9e "ChanSpy", read_vol_adjustment = 0,
    write_vol_adjustment = 0}, fd = 0, volfactor = 0}
        running = 1
        res = 1
        x = 0
        inp = '\0' <repeats 23 times>
        name = 0xb70b9780 "SIP/Test1-be55"
        f = (struct ast_frame *) 0x0
#3  0xb74769fb in chanspy_exec (chan=0x81bbca0, data=0xb70be048) at app_chanspy.c:516
        x = 7
        group = 0x0
        igrp = 1
        u = (struct localuser *) 0x819c980
        peer = (struct ast_channel *) 0x81ae5d0
        prev = (struct ast_channel *) 0x81ae5d0
        name = '\0' <repeats 255 times>
        peer_name = "spy-sip\000Test1-be55", '\0' <repeats 242 times>
        args = 0xb70b98d0 "SIP/Test1"
        ptr = 0xb70b9bbb "Test1-be55"
        options = 0xb70b98da "b"
        spec = 0xb70b98d0 "SIP/Test1"
---Type <return> to continue, or q <return> to quit---
        argv = {0xb70b98d0 "SIP/Test1", 0xb70b98da "b", 0x0, 0x0, 0x0}
        mygroup = 0x0
        recbase = 0x0
        res = 0
        volfactor = 0
        silent = 0
        argc = 2
        bronly = 2
        chosen = 0
        count = 1
        waitms = 100
        num = 0
        oldrf = 4
        oldwf = 4
        fd = 0
        flags = {flags = 2}
        zero_volume = 0 '\0'
        __PRETTY_FUNCTION__ = "chanspy_exec"
#4  0x0808bb49 in pbx_exec (c=0x81bbca0, app=0x8196328, data=0xb70be048, newstack=1) at pbx.c:544
        res = 134790235
        saved_c_appl = 0x0
        saved_c_data = 0x0
        execute = (int (*)(struct ast_channel *, void *)) 0xb7475df0 <chanspy_exec>
        __PRETTY_FUNCTION__ = "pbx_exec"
#5  0x0808fb2e in pbx_extension_helper (c=0x81bbca0, con=0x0, context=0x81bbdf0 "default",
    exten=0x81bbee4 "3", priority=1, label=0x0, callerid=0x8159df8 "Test3", action=1) at pbx.c:1687
        e = (struct ast_exten *) 0x819da10
        app = (struct ast_app *) 0x8196328
        sw = (struct ast_switch *) 0x0
        data = 0x0
        foundcontext = 0x81bbdf0 "default"
        newstack = 1
        res = 0
        status = 5
---Type <return> to continue, or q <return> to quit---
        incstack = {0x0, 0xb7ebe0dc "<\236\022", 0xb <Address 0xb out of bounds>,
  0xd <Address 0xd out of bounds>, 0xb70c00e8 "\220\001\f&#65533;, 0xb7ebe0dc "<\236\022",
  0x811fdf8 "\030", 0xb70c00c8 "\f\002\f&#65533;001\f&#1975;&#65533;,
  0xb70c00f8 "L\002\fL\002\fL\002\f[\002\f\233\002\fL\002\f\233\002\f",
  0xb7e94f96 "\211E\230\213E&#1082;\001", 0x3 <Address 0x3 out of bounds>, 0x0, 0x811fdfc "\002",
  0xb70c00c8 "\f\002\f&#65533;001\f&#1975;&#65533;, 0x80925c6 "\203&#65533;\203|$P", 0xb70ca468 "&#65533;004",
  0x80925c6 "\203&#65533;\203|$P", 0xb7f7689e "R", 0xb7df41a4 "\201&#65533;\237\f", 0xb7f76890 "&#65533;n",
  0xb7f7690c "\030", 0xb7ebe0dc "<\236\022",
  0xb70c00f0 "\001\200L\002\fL\002\fL\002\fL\002\f[\002\f\233\002\fL\002\f\233\002\f",
  0xb70c00cc "&#65533;001\f&#1975;&#65533;,
  0xb7df54a1 "\211~\020\213U\024\211~\f\211~\004\205&#65533;6\213U\024\213}&#65533;211V\024\211V\b1&#65533;211~\030\211\226\230",
  0xb70c00f0 "\001\200L\002\fL\002\fL\002\fL\002\f[\002\f\233\002\fL\002\f\233\002\f",
  0xb70c024c "&#65533;033\b", 0xb70c029b "\b\001", 0x0, 0xb70c029b "\b\001", 0xb7ebe0dc "<\236\022",
  0x810d6a5 "\"%s\" <%s>", 0xb70c020c "\020&#65533;034\b\235\025\b\200\004\f",
  0xb70c01dc "\001\fBw&#1911;L\002\fP", 0xb7def8a6 "\213\215\f\211&#65533;\2150t\t\213(&#65533;006",
  0xb70c00f0 "\001\200L\002\fL\002\fL\002\fL\002\f[\002\f\233\002\fL\002\f\233\002\f",
  0x810d6a5 "\"%s\" <%s>", 0xb70c0214 "\200\004\f", 0xb70c024c "&#65533;033\b", 0x0,
  0xb70c0190 "&#65533;&#48628;\001\f&#65533;&#1783;&#65533;&#65533;,
  0xb70c00f0 "\001\200L\002\fL\002\fL\002\fL\002\f[\002\f\233\002\fL\002\f\233\002\f",
  0xfbad8001 <Address 0xfbad8001 out of bounds>, 0xb70c024c "&#65533;033\b", 0xb70c024c "&#65533;033\b",
  0xb70c024c "&#65533;033\b", 0xb70c024c "&#65533;033\b", 0xb70c025b "\b(c\031\b\001", 0xb70c029b "\b\001",
  0xb70c024c "&#65533;033\b", 0xb70c029b "\b\001", 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
  0x1 <Address 0x1 out of bounds>, 0xb7000000 <Address 0xb7000000 out of bounds>, 0x0, 0x0, 0x0, 0x0,
  0x0, 0xffffffff <Address 0xffffffff out of bounds>, 0xb7eb14dd "corrupted double-linked list",
  0xb7eb14dd "corrupted double-linked list", 0xb7eb14dd "corrupted double-linked list", 0x0, 0x0,
  0x0, 0xb7ebe0dc "<\236\022", 0x80925c6 "\203&#65533;\203|$P", 0x10 <Address 0x10 out of bounds>,
  0x18 <Address 0x18 out of bounds>, 0xb7ebf938 "", 0x0, 0xb7ebf924 "", 0xb7ebdb20 "", 0x0,
  0xfffff194 <Address 0xfffff194 out of bounds>, 0xb7ebe0dc "<\236\022",
  0xb70c01b4 "&#65533;001\f\0050&#65533;200\004\f\001", 0xb7dbc7e9 "\215&", 0xb7ebe0dc "<\236\022",
  0xb7ebf900 "", 0x0, 0xb70c026c "H&#65533;v&#65533;033\b",
  0xb7df75d3 "&#65533;\213\215\\9A\004&#65533;022\213\225\\\213r\b9F\004\211\\w&#65533;213\205\\\213p\f&#65533;222\201}&#65533;\001", 0x1 <Address 0x1 out of bounds>, 0xb70c01e0 "Bw&#1911;L\002\fP",
  0xb7f73005 "\213E \213U\034\213H \211\024$\211M&#65533;\227$", 0xb70c0480 "\024\204&#65533;v\f",
---Type <return> to continue, or q <return> to quit---
  0x1 <Address 0x1 out of bounds>, 0xb7f6f0b0 "U\211&#65533;213E\be\001", 0x818f2a0 " \232\031",
  0xb7df7334 "\201èm\f", 0xb7ebe0dc "<\236\022", 0x0, 0xb70c0bb0 "\v\f&#65533;032\b\v\f\001",
  0xb70c01f8 "&#65533;004\fG\n\b,\033\bP&#65533;033\b\024",
  0xb7dd7742 "\203&#65533;020[]&#65533;220\220\220\220\220\220\220\220U\211&#65533;215M\020S\203&#65533;f\213U\f\211L$\b\213E\b&#65533;206\025\201&#65533;i\016", 0xb70c024c "&#65533;033\b", 0x50 <Address 0x50 out of bounds>,
  0x810d6a5 "\"%s\" <%s>", 0xb70c020c "\020&#65533;034\b\235\025\b\200\004\f", 0xb7f78414 "&#65533;",
  0xb70c04c8 "", 0x80af947 "\213\204$", 0x81bba2c "", 0x81bc050 "",
  0x14 <Address 0x14 out of bounds>, 0x81cd910 "Test3", 0x8159df8 "Test3",
  0xb70c0480 "\024\204&#65533;v\f", 0x0, 0x0, 0x810d5d9 "<unknown>", 0x8159df8 "Test3",
  0x8159df8 "Test3", 0xb70c04c8 "", 0xb70c0280 "\033\b", 0x0,
  0xb7e11196 "\211&#65533;\001&#65533;s\001&#65533;N\b",
  0x80d3fa8 "\213D$\020\213T$\024\211\003\211S\004\211&#65533;203&#65533;030[&#65533;004", 0xb70c0250 "", 0x0}
        passdata = "SIP/Test1|b", '\0' <repeats 8180 times>
        stacklen = 0
        tmp = "\033[1;36;40mChanSpy\033[0;37;40m", '\0' <repeats 52 times>
        tmp2 = "\033[1;35;40mSIP/Test3-9df7\033[0;37;40m", '\0' <repeats 45 times>
        tmp3 = "\033[1;35;40mSIP/Test1|b\033[0;37;40m", '\0' <repeats 3057 times>, "\004C&#2039;\224f&#1975;\000\000\000\000\201&#65533;\000\000\000\000&#65533;&#65533;000\000\000\000U&#65533;020\b&#65533;v\207 &#65533;vU&#65533;020\b", '\0' <repeats 84 times>, "&#65533;000&#1911;&#65533;\v&#65533;v", '\0' <repeats 170 times>, "d \000\000\000\000\001", '\0' <repeats 43 times>, "\n\000\000\000\021", '\0' <repeats 19 times>, "&\000\000\000\001\000\000\000<&#65533;v&#65533;\vS&#65533;020\b\002\000\000\000", '\0' <repeats 92 times>, "U&#65533;020\b", '\0' <repeats 128 times>...
        atmp = '\0' <repeats 79 times>
        atmp2 = '\0' <repeats 8291 times>
        __PRETTY_FUNCTION__ = "pbx_extension_helper"
#6  0x08091061 in ast_spawn_extension (c=0x81bbca0, context=0x81bbdf0 "default", exten=0x81bbee4 "3",
    priority=1, callerid=0x8159df8 "Test3") at pbx.c:2220
No locals.
#7  0x0809157b in __ast_pbx_run (c=0x81bbca0) at pbx.c:2286
        firstpass = 1
        digit = 0
        exten = '\0' <repeats 255 times>
        pos = 0
        waittime = -1208537232
        res = 0
---Type <return> to continue, or q <return> to quit---
        autoloopflag = 0
        __PRETTY_FUNCTION__ = "__ast_pbx_run"
#8  0x080925b6 in pbx_thread (data=0x81bbca0) at pbx.c:2507
        c = (struct ast_channel *) 0x81bbca0
#9  0xb7f6e361 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
No symbol table info available.
#10 0xb7e5cbde in clone () from /lib/tls/i686/cmov/libc.so.6
No symbol table info available.
(gdb)