PARI/GP Bug report logs - #124
handling interrupt

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Date: Sun, 9 Jan 2005 19:25:16 +0100
To: 124@pari.math.u-bordeaux.fr
Cc: igor@txc.com
Subject: Re: Bug#124: handling interrupt
Message-ID: <20050109182516.GV23145@seventeen>
References: <20041209215919.GV13401@txc.com> <20041210170624.GB13401@txc.com> <20041210175231.GC30613@seventeen> <20041214201724.GM13401@txc.com> <20041214204646.GA29446@geo.math.u-psud.fr>
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From: Bill Allombert <allomber@math.u-bordeaux.fr>

Another similar problem:
? g(n)=forvec(v=vector(n,i,[1,2]),s=sum(i:small=1,#v,v[i]);print1(v," "),1);
? g(1000)
^C

Unfrequently, this cause GP to hang.

I can still reproduce that using gp2c-run to compile g().

Apparently, you need fast I/O to have a chance to press ^C at the
correct time, so gp under gdb or through ssh is ruled out.

Here the backtrace (under gp2c-dbg)
#0  0x401f587e in sigsuspend () from /lib/libc.so.6
#1  0x402f1879 in __pthread_wait_for_restart_signal ()
   from /lib/libpthread.so.0
#2  0x402f3636 in __pthread_lock () from /lib/libpthread.so.0
#3  0x402eff3a in pthread_mutex_lock () from /lib/libpthread.so.0
#4  0x402f2b51 in flockfile () from /lib/libpthread.so.0
#5  0x4022d3e4 in fflush () from /lib/libc.so.6
#6  0x081bc8a8 in normalOutF () at ../src/language/es.c:207
#7  0x081bca15 in pariflush () at ../src/language/es.c:248
#8  0x081c8648 in pari_err (numerr=19) at ../src/language/init.c:1084
#9  0x0822acb2 in gp_handle_SIGINT () at ../src/gp/gp.c:2235
#10 0x0822acf5 in gp_sighandler (sig=2) at ../src/gp/gp.c:2250
#11 0x402f1f54 in pthread_sighandler () from /lib/libpthread.so.0
#12 0x401f56b8 in sigaction () from /lib/libc.so.6
#13 0x402f0253 in pthread_mutex_unlock () from /lib/libpthread.so.0
#14 0x402f2b79 in funlockfile () from /lib/libpthread.so.0
#15 0x4022dad2 in fputs () from /lib/libc.so.6
#16 0x081bc870 in normalOutS (s=0x825d0b3 ", ") at ../src/language/es.c:201
#17 0x081bc9fc in pariputs (s=0x825d0b3 ", ") at ../src/language/es.c:245
#18 0x081c15a1 in bruti (g=0x407f9e20, T=0xbffff7f4, addsign=1)
    at ../src/language/es.c:1774
#19 0x081c3942 in gen_output (x=0x407f9e20, T=0xbffff7f4)
    at ../src/language/es.c:2403
#20 0x081bcc47 in vpariputs (format=0x4001708e "%Z ", args=0xbffff868)
    at ../src/language/es.c:310
#21 0x081bccbc in pariputsf (format=0x4001708e "%Z ")
    at ../src/language/es.c:325
#22 0x40016d49 in g (n=0x408078fc) at foo.gp.c:65
#23 0x081b859f in identifier () at ../src/language/anal.c:2069
#24 0x081b5e67 in truc () at ../src/language/anal.c:1331
#25 0x081b5b25 in facteur () at ../src/language/anal.c:1267
#26 0x081b4443 in expr () at ../src/language/anal.c:799
#27 0x081b4247 in seq () at ../src/language/anal.c:759
#28 0x081b3334 in lisseq0 (t=0x8310fe8 "g(1000)", f=0x81b41d4 <seq>)
    at ../src/language/anal.c:373
#29 0x081b373c in readseq (c=0x8310fe8 "g(1000)", strict=0)
    at ../src/language/anal.c:445
#30 0x0822bc9a in gp_main_loop (ismain=1) at ../src/gp/gp.c:2667
#31 0x0822cbd5 in main (argc=1, argv=0xbffffce4) at ../src/gp/gp.c:2983

Another trace, with gp2c-run by attaching dbg after the lock up:

#0  0x401f587e in ?? ()
#1  0x402f1879 in ?? ()
#2  0x402f3636 in ?? ()
#3  0x402eff3a in ?? ()
#4  0x402f2b51 in ?? ()
#5  0x4022d3e4 in ?? ()
#6  0x081bc8a8 in wr_vecsmall (T=0x402fcae0, g=0x0) at ../src/language/es.c:921
#7  0x081bca15 in round_up (resd=0x402fcae0, n=136695850, res=0xbffff1c8)
    at ../src/language/es.c:951
#8  0x081c8648 in shiftaddress_canon (x=0x13, dec=136935616)
    at ../src/language/init.c:1565
#9  0x0822acb2 in read_opt (A=0x402fcae0, argc=137000800, argv=0x13)
    at ../src/gp/gp.c:2916
    at ../src/language/es.c:2070
#20 0x081c157f in texi_nobrace (g=0x407f9e20, T=0xbffff864, addsign=1)
    at ../src/language/es.c:2196
#21 0x081c3942 in is_long_ok (f=0x407f9e20, L=-1073743772)
    at ../src/language/es.c:3210
#22 0x081bcc47 in wr_float (T=0x4001708e, x=0xbffff8d8, f_format=-1073743668)
    at ../src/language/es.c:996
#23 0x081bccbc in wr_float (T=0x4001708e, x=0x407f9e20, f_format=-1073743564)
    at ../src/language/es.c:1003
#24 0x40016d49 in ?? ()
#25 0x081b859f in entry () at ../src/language/anal.c:2641
#26 0x081b5e67 in identifier () at ../src/language/anal.c:1899
#27 0x081b5b25 in identifier () at ../src/language/anal.c:1843
#28 0x081b4443 in truc () at ../src/language/anal.c:1367
#29 0x081b4247 in truc () at ../src/language/anal.c:1332
#30 0x081b3334 in init_buf (len=137433064, ptbuf=0x81b41d4, ptlim=0xbffffc4c)
    at ../src/language/anal.c:1011
#31 0x081b373c in any_string () at ../src/language/anal.c:1104
#32 0x0822bc9a in hashtable_generator (text=0x1 <Address 0x1 out of bounds>,
    state=500000, hash=0xbffffcec) at ../src/gp/gp_rl.c:419
#33 0x0822cbd5 in print_escape_string (s=0x1 <Address 0x1 out of bounds>)
    at ../src/gp/gp_rl.c:771
#34 0x401e514f in ?? ()

Cheers,
Bill.

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