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Hello Again,
On 24/11/16 02:52, Jerome BENOIT wrote:
>
>
> On 23/11/16 09:59, Bill Allombert wrote:
>> Can you generate a full strace dump ?
>
> Yes. Unfortunately I have not yet succeeded to decipher them.
>
> There is a `Broken pipe' somewhere.
> The piping seems to be related to the uncompresion of a `manual.siz.gx'.
There are a myriad of processes: the messages around the `Broken pipe' are:
execve("/bin/gunzip", ["gunzip"], [/* 90 vars */]) = 0
[...]
rt_sigaction(SIGINT, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGHUP, NULL, {SIG_IGN, [], 0}, 8) = 0
rt_sigaction(SIGPIPE, NULL, {SIG_IGN, [], 0}, 8) = 0
rt_sigaction(SIGTERM, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGXCPU, NULL, {SIG_DFL, [], 0}, 8) = 0
rt_sigaction(SIGXFSZ, NULL, {SIG_IGN, [], 0}, 8) = 0
rt_sigaction(SIGINT, {0x4035c0, [INT TERM XCPU], SA_RESTORER, 0x7eff302e1040},
NULL, 8) = 0
rt_sigaction(SIGTERM, {0x4035c0, [INT TERM XCPU], SA_RESTORER, 0x7eff302e1040},
NULL, 8) = 0
rt_sigaction(SIGXCPU, {0x4035c0, [INT TERM XCPU], SA_RESTORER, 0x7eff302e1040},
NULL, 8) = 0
ioctl(0, TCGETS, 0x7ffef9ddf1c0) = -1 ENOTTY (Inappropriate ioctl for
device)
fstat(0, {st_mode=S_IFREG|0644, st_size=171476, ...}) = 0
read(0,
"\37\213\10\0\0\0\0\0\2\3\244\\\331\222\324H\226}\317\257\220\345\274T\233\1\346\3732c\363\240"...,
32768) = 32768
brk(NULL) = 0x669000
brk(0x68a000) = 0x68a000
write(1, "#SIXFORMAT GapDocGAP\nHELPBOOKIN"..., 32768) = 32768
write(1, ".4-1\", [ 20, 4, 1 ], 98, 246, \"l"..., 32768) = 32768
write(1, " \"35.3-5\", [ 35, 3, 5 ], 310, 46"..., 32768) = 16384
- --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=9643, si_uid=1000} ---
write(1, "033[101X\", \"41.10-2\", \n [ 4"..., 16384) = -1 EPIPE (Broken
pipe)
- --- SIGPIPE {si_signo=SIGPIPE, si_code=SI_USER, si_pid=9643, si_uid=1000} ---
write(2, "\ngzip: ", 7) = 7
write(2, "stdout: Broken pipe\n", 20) = 20
rt_sigprocmask(SIG_BLOCK, [INT TERM XCPU], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
lseek(0, 0, SEEK_CUR) = 32768
close(0) = 0
close(1) = 0
close(2) = 0
exit_group(1) = ?
+++ exited with 1 +++
[[/bin/gunzip is in fact a shell script that wraps `gzip -d' ]]
It looks like that it happens what is described in the following link:
https://blog.nelhage.com/2010/02/a-very-subtle-bug/
that is to say, python/sage manipulates SIGPIPE in such a way that any gzip
piping
becomes hazardous. If so, I guess that we have to consider to use zlib instead
of pipe+gunzip.
>
> A closer look to the gap code convinces me that zlib for gzip uncompression
> instead of piping through gunzip.
>
> Thanks,
> Jerome
Thanks,
Jerome
>
>>>>
>
>
> _______________________________________________
> Debian-science-sagemath mailing list
> debian-science-sagem...@lists.alioth.debian.org
> https://lists.alioth.debian.org/mailman/listinfo/debian-science-sagemath
>
- --
Jerome BENOIT | calculus+at-rezozer^dot*net
https://qa.debian.org/developer.php?login=calcu...@rezozer.net
AE28 AE15 710D FF1D 87E5 A762 3F92 19A6 7F36 C68B
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