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Date: Tue, 22 Jun 2004 22:20:32 +0200 (CEST)
From: =?ISO-8859-2?Q?Maciej_=AFenczykowski?= <maze@cela.pl>
To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: 2.4.27-rc1 pipes - file -z hangs on some gzip files
Message-ID: <Pine.LNX.4.58LT.0406222137100.12146@gaia.cela.pl>
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Hi!
I'm investigating a weird hang of file -z (both newest version from Fedora 
Core 1 [4.02] and from Fedora Core 2 [4.07]) on a 2.4.27-rc1 kernel.

file -z reiserfs.o.gz hangs, strace -f file -z reiserfs.o.gz shows the 
following end fragment.
The same file binary [the 4.07 one] works on this file on a 2.6 kernel 
(the current default from FC2) but on a different system.

The problem appears to be pipe related.

[the data is correctly compressed, decompressed correctly, and I have two 
compressed files that behave this way]

[pid 1033 is the file command, pid 1034 is gzip -cdq subprocess, piped 
i/o]

[pid  1033] close(4)                    = 0
[pid  1033] close(7)                    = 0
[pid  1033] write(5, 
"\37\213\10\10_\207\330@\2\3reiserfs.o\0\314\375\v|T\325"..., 65536 
<unfinished ...>
[pid  1034] <... read resumed> 
"\37\213\10\10_\207\330@\2\3reiserfs.o\0\314\375\v|T\325"..., 32768)
= 32768
[pid  1034] brk(0)                      = 0x80a6f70
[pid  1034] brk(0x80c7f70)              = 0x80c7f70
[pid  1034] brk(0)                      = 0x80c7f70
[pid  1034] brk(0x80c8000)              = 0x80c8000
[pid  1034] brk(0)                      = 0x80c8000
[pid  1034] brk(0)                      = 0x80c8000
[pid  1034] brk(0x80c7000)              = 0x80c7000
[pid  1034] brk(0)                      = 0x80c7000
[pid  1034] write(1, 
"\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0\3\0\1\0\0\0\0\0\0\0"..., 32768

is this a kernel problem? shared library problem (libz?), any ideas?

Thanks,
MaZe.

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