Subject: Re: kern/32682: netbsd-3 ptyfs intermittent failure with Matlab
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: Hauke Fath <hf@spg.tu-darmstadt.de>
List: netbsd-bugs
Date: 07/17/2006 14:55:02
The following reply was made to PR kern/32682; it has been noted by GNATS.
From: Hauke Fath <hf@spg.tu-darmstadt.de>
To: christos@zoulas.com (Christos Zoulas)
Cc: gnats-bugs@NetBSD.org, kern-bug-people@NetBSD.org,
gnats-admin@NetBSD.org, netbsd-bugs@NetBSD.org
Subject: Re: kern/32682: netbsd-3 ptyfs intermittent failure with Matlab
Date: Mon, 17 Jul 2006 16:54:30 +0200
Am 31.01.2006 um 12:52 Uhr -0500 schrieb Christos Zoulas:
>
>Can you show what w(1) prints and the "interesting" ptys in /dev/[pt]ty??.
>I suspect what is going on, is that you have a rogue program that is
>opening old style pty's behind the pty subsystem's back, so when ptyfs
>tries to open the same pty, it fails. So when it fails for pts/4 for
>example, what does lsof say for /dev/{t,p}typ4?
Getting back to this after a while...
I have pkgsrc-2006Q1 packages out now which were built on a machine
without the /dev/[pt]ty[pqrs]? pty device files, and deployed on
clients that do not have them, either, but use ptyfs mounted to
/dev/pts instead.
But I still see matlab failing to open a /dev/pts/? every now and
then, although the /dev/ptmx && /dev/pts/? way should be the only way
to get a pty on the machine now, so no concurrent access, right?
The details:
[ kdump | tail ...]
25589 MATLAB CALL open(0xb9f56725,0x8002,0)
25589 MATLAB NAMI "/emul/linux/dev/ptmx"
25589 MATLAB NAMI "/dev/ptmx"
25589 MATLAB RET open 8
25589 MATLAB CALL ioctl(8,_IO('T',0x1,0),0xbfbf537c)
25589 MATLAB RET ioctl 0
25589 MATLAB CALL ioctl(8,_IOW('T',0x30,0x4),0xbfbf54ac)
25589 MATLAB GIO fd 8 read 40 bytes
"\^D\0\0\0\^D\0\0\0/dev/null\0\0\0\0\0\0\0/dev/pts/4\0\0\0\0\0\0"
25589 MATLAB RET ioctl 0
25589 MATLAB CALL stat64(0xbfbf54fc,0xbfbf5434)
25589 MATLAB NAMI "/emul/linux/dev/pts/4"
25589 MATLAB NAMI "/dev/pts/4"
25589 MATLAB RET stat64 0
25589 MATLAB CALL statfs(0xbfbf54fc,0xbfbf64fc)
25589 MATLAB NAMI "/emul/linux/dev/pts/4"
25589 MATLAB NAMI "/dev/pts/4"
25589 MATLAB RET statfs 0
25589 MATLAB CALL ioctl(8,_IOR('T',0x31,0x4),0xbfbf6538)
25589 MATLAB RET ioctl -1 errno -22 Invalid argument
25589 MATLAB CALL ioctl(8,_IO('T',0x1,0),0xbfbf63ec)
25589 MATLAB RET ioctl 0
25589 MATLAB CALL ioctl(8,_IOW('T',0x30,0x4),0xbfbf651c)
25589 MATLAB GIO fd 8 read 40 bytes
"\^D\0\0\0\^D\0\0\0/dev/null\0\0\0\0\0\0\0/dev/pts/4\0\0\0\0\0\0"
25589 MATLAB RET ioctl 0
25589 MATLAB CALL stat64(0xbd3d5810,0xbfbf64a4)
25589 MATLAB NAMI "/emul/linux/dev/pts/4"
25589 MATLAB NAMI "/dev/pts/4"
25589 MATLAB RET stat64 0
25589 MATLAB CALL rt_sigaction(0x11,0xbfbf6218,0xbfbf618c,8)
25589 MATLAB RET rt_sigaction 0
25589 MATLAB CALL rt_sigprocmask(1,0xbfbf6390,0,8)
25589 MATLAB RET rt_sigprocmask 0
25589 MATLAB CALL open(0xba99b2d0,0x8002,0)
25589 MATLAB NAMI "/emul/linux/dev/pts/4"
25589 MATLAB NAMI "/dev/pts/4"
25589 MATLAB RET open -1 errno -13 Permission denied
25589 MATLAB CALL rt_sigprocmask(1,0xbfbf0350,0,8)
25589 MATLAB RET rt_sigprocmask 0
25589 MATLAB CALL kill(0x63f5, SIGABRT)
25589 MATLAB RET kill 0
25589 MATLAB PSIG SIGABRT SIG_DFL
25589 MATLAB NAMI "MATLAB.core"
14493 MATLAB RET poll 0
14493 MATLAB CALL getppid
14493 MATLAB RET getppid 1
14493 MATLAB CALL kill(0x572a, SIGKILL)
14493 MATLAB RET kill -1 errno -3 No such process
14493 MATLAB CALL kill(0x1543, SIGKILL)
14493 MATLAB RET kill 0
5443 MATLAB RET nanosleep -1 errno -4 Interrupted system call
5443 MATLAB PSIG SIGKILL SIG_DFL
14493 MATLAB PSIG SIGRT1 caught handler=0xbd4be460
mask=(1,2,3,4,6,8,10,11,12,13,14,15,16,18,19,20,21,22,23,24,25,26,27,28,30,31,32,33))
14493 MATLAB CALL sigreturn(0x80a1ec0)
14493 MATLAB RET sigreturn -1 errno -2 No such file or directory
14493 MATLAB CALL exit_group(0)
[hf@Auernig] /<1>tmp/matlab-issues > uname -a
NetBSD Auernig.nt.e-technik.tu-darmstadt.de 3.0_STABLE NetBSD
3.0_STABLE (SPG_PIII) #0: Wed May 31 13:18:31 CEST 2006
hf@Gstoder.nt.e-technik.tu-darmstadt.de:/var/obj/netbsd-builds/3_0/i386/sys/arch/i386/compile/SPG_PIII
i386
[hf@Auernig] /<1>tmp/matlab-issues > ls -la /dev/pts/
total 31
dr-xr-xr-x 1 root wheel 512 Jun 23 03:15 .
drwxr-xr-x 5 root wheel 30720 Jul 12 03:32 ..
crw--w---- 1 ruebsam tty 5, 0 Jun 22 09:04 0
crw--w---- 1 ruebsam tty 5, 1 Jul 17 16:25 1
crw------- 1 ruebsam tty 5, 2 Jul 17 14:15 2
crw--w---- 1 hf tty 5, 3 Jul 17 16:28 3
[hf@Auernig] /<1>tmp/matlab-issues > ls -la /dev/[pt]ty??
crw-rw---- 1 uucp persons 8, 0 Jun 16 2005 /dev/tty00
crw------- 1 uucp wheel 8, 1 Jun 16 2005 /dev/tty01
crw------- 1 uucp wheel 8, 2 Jun 16 2005 /dev/tty02
crw------- 1 uucp wheel 8, 3 Jun 16 2005 /dev/tty03
crw------- 1 root wheel 47, 0 Jun 23 03:15 /dev/ttyE0
crw------- 1 root wheel 47, 1 Jun 23 03:15 /dev/ttyE1
crw------- 1 root wheel 47, 2 Jun 23 03:15 /dev/ttyE2
crw------- 1 root wheel 47, 3 Jun 23 03:15 /dev/ttyE3
crw------- 1 root wheel 47, 4 Jun 16 2005 /dev/ttyE4
crw------- 1 root wheel 47, 5 Jun 16 2005 /dev/ttyE5
crw------- 1 root wheel 47, 6 Jun 16 2005 /dev/ttyE6
crw------- 1 root wheel 47, 7 Jun 16 2005 /dev/ttyE7
crw-rw---- 1 uucp persons 8, 0 Apr 20 03:28 /dev/ttyU0
crw------- 1 uucp wheel 66, 1 Jun 16 2005 /dev/ttyU1
[hf@Auernig] /<1>tmp/matlab-issues > w
4:33PM up 25 days, 7:31, 3 users, load averages: 2.23, 2.33, 2.22
USER TTY FROM LOGIN@ IDLE WHAT
ruebsam :0 - 8:30AM ? /bin/sh /usr/pkg/bin/startkde
ruebsam pts/1 :0.0 9:07AM 7 -tcsh
hf pts/3 localhost:10.0 3:55PM 0 w
[hf@Auernig] /<1>tmp/matlab-issues >
The complete ktrace and the matlab core are at
http://www.spg.tu-darmstadt.de/~hf/netbsd/pr32682/matlab-issues.tar.bz2
hauke
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