Subject: 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: 01/31/2006 17:25:00
>Number: 32682
>Category: kern
>Synopsis: netbsd-3 ptyfs intermittent failure with Matlab
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue Jan 31 17:25:00 +0000 2006
>Originator: Hauke Fath <hf@spg.tu-darmstadt.de>
>Release: NetBSD 3.0_STABLE
>Organization:
--
/~\ The ASCII Ribbon Campaign Hauke Fath
\ / No HTML/RTF in email Institut für Nachrichtentechnik
X No Word docs in email TU Darmstadt
/ \ Respect for open standards Ruf +49-6151-16-3281
>Environment:
System: NetBSD Wintersberg 3.0_STABLE NetBSD 3.0_STABLE (SPG_PIII) #1: Mon Jan 23 18:52:48 CET 2006 hf@Heiligenberg:/var/obj/netbsd-builds/3_0/i386/sys/arch/i386/compile/SPG_PIII i386
Architecture: i386
Machine: i386
>Description:
With the pty subsystem that comes with NetBSD 3, Matlab
expects to find its ptys in /dev/pts. Every once in a while,
the required pty cannot be created, which results in Matlab 13
issuing dire warnings ("...no background processes/job
control/blah"), and Matlab 14 simply aborting.
Sometimes the problem "goes away" after some tens of minutes,
at other times it needs a reboot to "fix". It is more likely
to appear with several users logged in on the machine.
The end of a Matlab 14 ktrace looks like
[...]
883 MATLAB NAMI "/dev/ptmx"
883 MATLAB RET open 7
883 MATLAB CALL ioctl(7,_IO('T',0x1,0),0xbfbf535c)
883 MATLAB RET ioctl 0
883 MATLAB CALL ioctl(7,_IOW('T',0x30,0x4),0xbfbf541c)
883 MATLAB GIO fd 7 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"
883 MATLAB RET ioctl 0
883 MATLAB CALL stat64(0xbfbf54f0,0xbfbf5440)
883 MATLAB NAMI "/emul/linux/dev/pts/4"
883 MATLAB NAMI "/dev/pts/4"
883 MATLAB RET stat64 0
883 MATLAB CALL statfs(0xbfbf54f0,0xbfbf64f0)
883 MATLAB NAMI "/emul/linux/dev/pts/4"
883 MATLAB NAMI "/dev/pts/4"
883 MATLAB RET statfs 0
883 MATLAB CALL ioctl(7,_IOR('T',0x31,0x4),0xbfbf6528)
883 MATLAB RET ioctl -1 errno -22 Invalid argument
883 MATLAB CALL ioctl(7,_IO('T',0x1,0),0xbfbf63cc)
883 MATLAB RET ioctl 0
883 MATLAB CALL ioctl(7,_IOW('T',0x30,0x4),0xbfbf648c)
883 MATLAB GIO fd 7 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"
883 MATLAB RET ioctl 0
883 MATLAB CALL stat64(0xbd3dd888,0xbfbf64b0)
883 MATLAB NAMI "/emul/linux/dev/pts/4"
883 MATLAB NAMI "/dev/pts/4"
883 MATLAB RET stat64 0
883 MATLAB CALL rt_sigaction(0x11,0xbfbf6200,0xbfbf6170,8)
883 MATLAB RET rt_sigaction 0
883 MATLAB CALL rt_sigprocmask(1,0xbfbf6380,0,8)
883 MATLAB RET rt_sigprocmask 0
883 MATLAB CALL open(0xbac662e0,0x8002,0)
883 MATLAB NAMI "/emul/linux/dev/pts/4"
883 MATLAB NAMI "/dev/pts/4"
883 MATLAB RET open -1 errno -13 Permission denied
883 MATLAB CALL rt_sigprocmask(1,0xbfbf02b0,0,8)
883 MATLAB RET rt_sigprocmask 0
883 MATLAB CALL kill(0x373, SIGABRT)
883 MATLAB RET kill 0
883 MATLAB PSIG SIGABRT SIG_DFL
883 MATLAB NAMI "MATLAB.core"
27966 MATLAB RET poll 0
27966 MATLAB CALL getppid
27966 MATLAB RET getppid 1
27966 MATLAB CALL kill(0x6db7, SIGKILL)
27966 MATLAB RET kill -1 errno -3 No such process
27966 MATLAB CALL kill(0x1518, SIGKILL)
27966 MATLAB RET kill 0
5400 MATLAB RET nanosleep -1 errno -4 Interrupted system call
5400 MATLAB PSIG SIGKILL SIG_DFL
27966 MATLAB PSIG SIGRT1 caught handler=0xbd4c2eb0 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))
27966 MATLAB CALL sigreturn(0x80a14b4)
27966 MATLAB RET sigreturn -1 errno -2 No such file or directory
27966 MATLAB CALL exit_group(0)
where
[hf@Wintersberg] /var/tmp > ll /dev/pts
total 0
0 crw-rw-rw- 1 root wheel 5, 0 Jan 29 22:56 0
0 crw-rw-rw- 1 root wheel 5, 1 Jan 31 03:15 1
0 crw-rw-rw- 1 root wheel 5, 2 Jan 31 00:17 2
0 crw--w---- 1 cbrown tty 5, 3 Jan 20 16:48 3
0 crw--w---- 1 hf tty 5, 5 Jan 31 18:04 5
[hf@Wintersberg] /var/tmp >
The Matlab core and ktrace.out are at
http://www.spg.tu-darmstadt.de/~hf/netbsd/matlab-ptyfs-pr.tar.bz2
(4.3 MB).
>How-To-Repeat:
Start Matlab 13/14 on a NetBSD/i386 3 machine. Try a few
times, from different user accounts.
>Fix:
None, sorry.
>Unformatted: