Date: Wed, 19 Oct 2005 12:20:04 GMT From: Niall Murphy <niallm@avernus.net> To: freebsd-gnats-submit@FreeBSD.org Subject: kern/87658: IO::AIO test suite loops infinitely on 5.4-RELEASE-p5 Message-ID: <200510191220.j9JCK4wD005687@www.freebsd.org> Resent-Message-ID: <200510191230.j9JCUF48077516@freefall.freebsd.org>
next in thread | raw e-mail | index | archive | help
>Number: 87658
>Category: kern
>Synopsis: IO::AIO test suite loops infinitely on 5.4-RELEASE-p5
>Confidential: no
>Severity: serious
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Oct 19 12:30:15 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator: Niall Murphy
>Release: 5.4-RELEASE-p5
>Organization:
Amazon.COM
>Environment:
FreeBSD leonidas.avernus.net 5.4-RELEASE-p5 FreeBSD 5.4-RELEASE-p5 #1: Fri Jul 22 15:02:14 UTC 2005 niallm@leonidas.avernus.net:/usr/obj/usr/src/sys/LEONIDAS i386
>Description:
Something is wrong somewhere either in the AIO
implementation in FreeBSD, threading in FreeBSD,
or some expectation in how IO::AIO expects the above
to work. Running the test suite, and specifically
test number 2, stat, causes an infinite loop.
>How-To-Repeat:
Download IO::AIO 1.6x from CPAN. (It's probably
sufficient to do perl -eshell -MCPAN install IO::AIO.) Run the test suite with 'make test',
and then watch the suite hang at
t/01_stat.......
Pressing ctrl-T gives the following:
load: 1.51 cmd: perl5.8.6 75059 [runnable] 0.84u 0.07s 2% 2900k
load: 1.51 cmd: perl5.8.6 75059 [runnable] 2.00u 0.16s 6% 2900k
load: 1.58 cmd: perl5.8.6 75059 [runnable] 2.71u 3.34s 20% 2880k
load: 1.62 cmd: perl5.8.6 75059 [runnable] 3.20u 6.06s 28% 2880k
If you ctrl-C out, the test perl process continues running:
niallm@leonidas IO-AIO-1.61 $ ps auxww|grep -i perl
root 74237 53.6 0.6 3676 2916 p6 R 12:09PM 15:01.65 /usr/bin/perl -w t/01_stat.t (perl5.8.6)
niallm 75059 47.5 0.6 3672 2896 p6 R 12:25PM 0:11.92 /usr/bin/perl -w t/01_stat.t (perl5.8.6)
ktracing the processes gives:
leonidas# ktrace -p 74237
leonidas# kdump
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
74237 perl5.8.6 PSIG SIGSEGV SIG_DFL
[repeat until dead]
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200510191220.j9JCK4wD005687>