Could it be a failed attempt to recover from a PARI/GP stackoverflow?
Just guessing.
On Sun, Mar 3, 2019 at 9:21 AM Simon Brandhorst <sbrandho...@web.de> wrote:
>
> I am trying a medium scale computation. Unfortunately it breaks every time
> with error messages I do not know how to interpret.
> They may or may not be bugs in sage. Here is a traceback
>
> --------------------------------------------------------------------------
> ValueError Traceback (most recent call last)
> <ipython-input-6-1e340a4a9be4> in <module>()
> ----> 1 classify_ord_pe(L,Integer(2),Integer(2),'results/order4.txt','a')
>
> /home/simon/.sage/temp/k3/2030/K3_aut_classification.sageWSsnuG.py in
> classify_ord_pe(L, p, e, file_name, rw)
> 258 print(" ")
> 259 cofix = cofixed[k].twist(-_sage_const_1 )
> --> 260 for Aa in k3_prime_power(fix.genus(), p, e):
> 261 A, a, Oa = Aa
> 262 actsg = MaximalK3surfaceAut(A, cofix, a, Oa)
>
> /home/simon/.sage/temp/k3/2030/prime_power.sagez0p9M2.py in
> k3_prime_power(genus, prime, e)
> 138 signatures += [[ranks_E[k]]*(weights[k]//_sage_const_2 )
> for k in range(_sage_const_1 ,n)]
> 139 signatures[-_sage_const_1 ][_sage_const_0 ] -= _sage_const_1
> --> 140 for act in prime_power_actions(genus,prime,ranks,signatures):
> 141 yield act
> 142
>
> /home/simon/.sage/temp/k3/2030/prime_power.sagez0p9M2.py in
> prime_power_actions(genus, p, ranks, signatures)
> 278 # recurse
> 279 # print(R)
> --> 280 for N in prime_power_actions(R, p,
> ranks[:-_sage_const_1 ], R_signatures):
> 281 N, fN, GN = N
> 282 ext = extensions(M, fM, N, fN, GM, GN,
> glue_order, p)
>
> /home/simon/.sage/temp/k3/2030/prime_power.sagez0p9M2.py in
> prime_power_actions(genus, p, ranks, signatures)
> 278 # recurse
> 279 # print(R)
> --> 280 for N in prime_power_actions(R, p,
> ranks[:-_sage_const_1 ], R_signatures):
> 281 N, fN, GN = N
> 282 ext = extensions(M, fM, N, fN, GM, GN,
> glue_order, p)
>
> /home/simon/.sage/temp/k3/2030/prime_power.sagez0p9M2.py in
> prime_power_actions(genus, p, ranks, signatures)
> 196 if len(ranks) == _sage_const_1 :
> 197 # there is nothing to glue
> --> 198 for M in genus.representatives():
> 199 fM = M ** _sage_const_0
> 200 M = IntegralLattice(M)
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/quadratic_forms/genera/genus.pyc
> in representatives(self, backend, algorithm)
> 3161 if self.signature_pair()[0] == 0:
> 3162 e *= ZZ(-1)
> -> 3163 Q = QuadraticForm(e*self.representative())
> 3164 seeds = [Q]
> 3165 for p in self.spinor_generators(proper=False):
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/quadratic_forms/genera/genus.pyc
> in representative(self)
> 3010 """
> 3011 if self._representative is None:
> -> 3012 self._compute_representative()
> 3013 return self._representative
> 3014
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/quadratic_forms/genera/genus.pyc
> in _compute_representative(self, LLL)
> 3085 gp = Gp()
> 3086 m = pari(L)
> -> 3087 gp.read(SAGE_EXTCODE + "/pari/simon/qfsolve.gp")
> 3088 m = gp.eval('qflllgram_indefgoon(%s)'%m)
> 3089 # convert the output string to sage
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc
> in read(self, filename)
> 222 sage: os.unlink(filename)
> 223 """
> --> 224 self.eval(self._read_in_file_command(filename))
> 225
> 226 def _read_in_file_command(self, filename):
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
> in eval(self, code, strip, synchronize, locals, allow_use_file, split_lines,
> **kwds)
> 1349 elif split_lines:
> 1350 return '\n'.join([self._eval_line(L,
> allow_use_file=allow_use_file, **kwds)
> -> 1351 for L in code.split('\n') if
> L != ''])
> 1352 else:
> 1353 return self._eval_line(code,
> allow_use_file=allow_use_file, **kwds)
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/gp.pyc in
> _eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
> 443 a = Expect._eval_line(self, line,
> 444 allow_use_file=allow_use_file,
> --> 445 wait_for_prompt=wait_for_prompt)
> 446 if a.find("the PARI stack overflows") != -1:
> 447 verbose("automatically doubling the PARI stack and
> re-executing current input line")
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
> in _eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
> 914 try:
> 915 if self._expect is None:
> --> 916 self._start()
> 917 E = self._expect
> 918 try:
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/gp.pyc in
> _start(self, alt_message, block_during_init)
> 241
> 242 def _start(self, alt_message=None, block_during_init=True):
> --> 243 Expect._start(self, alt_message, block_during_init)
> 244 # disable memory debugging: those warnings can only confuse
> our
> 245 # interface
>
> /home/simon/sage/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
> in _start(self, alt_message, block_during_init)
> 517
> 518 try:
> --> 519 self._expect.expect(self._prompt)
> 520 except (pexpect.TIMEOUT, pexpect.EOF) as msg:
> 521 self._expect = None
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/spawnbase.pyc in
> expect(self, pattern, timeout, searchwindowsize, async_, **kw)
> 339 compiled_pattern_list = self.compile_pattern_list(pattern)
> 340 return self.expect_list(compiled_pattern_list,
> --> 341 timeout, searchwindowsize, async_)
> 342
> 343 def expect_list(self, pattern_list, timeout=-1,
> searchwindowsize=-1,
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/spawnbase.pyc in
> expect_list(self, pattern_list, timeout, searchwindowsize, async_, **kw)
> 367 return expect_async(exp, timeout)
> 368 else:
> --> 369 return exp.expect_loop(timeout)
> 370
> 371 def expect_exact(self, pattern_list, timeout=-1,
> searchwindowsize=-1,
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/expect.pyc in
> expect_loop(self, timeout)
> 109 return self.timeout()
> 110 # Still have time left, so read more data
> --> 111 incoming = spawn.read_nonblocking(spawn.maxread,
> timeout)
> 112 if self.spawn.delayafterread is not None:
> 113 time.sleep(self.spawn.delayafterread)
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/pty_spawn.pyc in
> read_nonblocking(self, size, timeout)
> 455 # * https://github.com/pexpect/pexpect/pull/304
> 456 # * http://trac.sagemath.org/ticket/10295
> --> 457 if select(0):
> 458 try:
> 459 incoming = super(spawn, self).read_nonblocking(size)
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/pty_spawn.pyc in
> select(timeout)
> 447 else:
> 448 def select(timeout):
> --> 449 return select_ignore_interrupts([self.child_fd], [],
> [], timeout)[0]
> 450
> 451 # If there is data available to read right now, read as much
> as
>
> /home/simon/sage/local/lib/python2.7/site-packages/pexpect/utils.pyc in
> select_ignore_interrupts(iwtd, owtd, ewtd, timeout)
> 141 while True:
> 142 try:
> --> 143 return select.select(iwtd, owtd, ewtd, timeout)
> 144 except InterruptedError:
> 145 err = sys.exc_info()[1]
>
> ValueError: filedescriptor out of range in select()
>
>
>
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