#14426: Runaway/Segfaulting ECL processes
-------------------------------------+--------------------------------------
Reporter: jdemeyer | Owner: roed
Type: defect | Status: new
Priority: blocker | Milestone: sage-5.9
Component: doctest framework | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by jdemeyer:
Old description:
> On some systems, when executing
> {{{
> ./sage -tp --long devel/sage/sage/interfaces/lisp.py
> }}}
> there are two ECL processes which do (strace log)
> {{{
> read(0, "(setq sage0 2)\n", 1024) = 15
> write(1, "\n", 1) = 1
> write(1, "2", 1) = 1
> write(1, "\n", 1) = 1
> write(1, ">", 1) = 1
> write(1, " ", 1) = 1
> read(0, 0x7f2c263b1000, 1024) = -1 EIO (Input/output error)
> --- SIGHUP (Hangup) @ 0 (0) ---
> --- SIGCONT (Continued) @ 0 (0) ---
> select(1, [0], NULL, NULL, {0, 0}) = 1 (in [0], left {0, 0})
> select(1, [0], NULL, NULL, {0, 0}) = 1 (in [0], left {0, 0})
> read(0, "", 1024) = 0
> write(2, "\n", 1) = -1 EIO (Input/output error)
> write(2, "\n", 1) = -1 EIO (Input/output error)
> write(2, "\n", 1) = -1 EIO (Input/output error)
> write(2, "\n", 1) = -1 EIO (Input/output error)
> [...]
> }}}
> after which they either segfault or keep running forever.
>
> A different way to see this problem:
> {{{
> ./sage --sh -c 'ecl < <(echo x) 2>/dev/full'
> }}}
New description:
On some systems, when executing
{{{
./sage -tp --long devel/sage/sage/interfaces/lisp.py
}}}
there are two ECL processes which do (strace log)
{{{
read(0, "(setq sage0 2)\n", 1024) = 15
write(1, "\n", 1) = 1
write(1, "2", 1) = 1
write(1, "\n", 1) = 1
write(1, ">", 1) = 1
write(1, " ", 1) = 1
read(0, 0x7f2c263b1000, 1024) = -1 EIO (Input/output error)
--- SIGHUP (Hangup) @ 0 (0) ---
--- SIGCONT (Continued) @ 0 (0) ---
select(1, [0], NULL, NULL, {0, 0}) = 1 (in [0], left {0, 0})
select(1, [0], NULL, NULL, {0, 0}) = 1 (in [0], left {0, 0})
read(0, "", 1024) = 0
write(2, "\n", 1) = -1 EIO (Input/output error)
write(2, "\n", 1) = -1 EIO (Input/output error)
write(2, "\n", 1) = -1 EIO (Input/output error)
write(2, "\n", 1) = -1 EIO (Input/output error)
[...]
}}}
after which they either segfault or keep running forever.
A different way to see this problem:
{{{
jdemeyer@boxen:/release/merger/sage-5.9.beta4$ ./sage --sh -c 'ecl <
<(echo x) 2>/dev/full'
ECL (Embeddable Common-Lisp) 12.12.1 (git:UNKNOWN)
Copyright (C) 1984 Taiichi Yuasa and Masami Hagiya
Copyright (C) 1993 Giuseppe Attardi
Copyright (C) 2000 Juan J. Garcia-Ripoll
ECL is free software, and you are welcome to redistribute it
under certain conditions; see file 'Copyright' for details.
Type :h for Help.
Top level.
> /bin/bash: line 1: 17727 Segmentation fault ecl < <(echo x) 2>
/dev/full
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14426#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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