Re: Possible breakage in 2.6.16?

[linux-os (Dick Johnson)]

On Tue, 28 Mar 2006, Gene Heskett wrote:

> On Tuesday 28 March 2006 13:19, linux-os (Dick Johnson) wrote:
>> On Tue, 28 Mar 2006, Gene Heskett wrote:
> Dick, this may be a resend to you, but I can't find it in my sent-mail
> box.  Honest, I did go thru the motions :)
>
>>> Greetings;
>>>
>>> Always curious as to what sort of information can be extracted from
>>> the tools linux gives us, I've discovered that netstat, from the
>>>
>>> net-tools-1.60-25.1 rpm
>>>
>>> no longer functions for anything as even a 'netstat --version' takes
>>> the curser to the upper left corner of the screen and hangs till
>>> ctl+c'd.
>>>
>>> The only evidence of its execution is a steady, about 2 per second,
>>> increase in the number of processes running as reported by gkrellm,
>>> all of which go away when I ctl+c netstat itself.
>>>
>>> I'm running 2.6.16 self configured here.
>>>
>>> Is this a known problem because my net-tools rpm is old?  Or because
>>> 2.6.16 broke it?
>>
>> strace netstat --version 2>info.txt
>> ^C
>>
>> Then read info.txt and see what it called that doesn't return.
>
> It appears strace does about 5-6 pages of its own setup, then this:
> --------------------open("/root/bin/netstat", O_RDONLY|O_LARGEFILE) = 3
> ioctl(3, SNDCTL_TMR_TIMEBASE or TCGETS, 0xaf86e2e8) = -1 ENOTTY
> (Inappropriate ioctl for device)
> _llseek(3, 0, [0], SEEK_CUR)            = 0
> read(3, "#!/bin/bash\nreset\nwhile [ 1 ] ; "..., 80) = 80
> _llseek(3, 0, [0], SEEK_SET)            = 0
> getrlimit(RLIMIT_NOFILE, {rlim_cur=1024, rlim_max=1024}) = 0
> dup2(3, 255)                            = 255
> close(3)                                = 0
> fcntl64(255, F_SETFD, FD_CLOEXEC)       = 0
> fcntl64(255, F_GETFL)                   = 0x8000 (flags O_RDONLY|
> O_LARGEFILE)
> fstat64(255, {st_mode=S_IFREG|0755, st_size=124, ...}) = 0
> _llseek(255, 0, [0], SEEK_CUR)          = 0
> rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
> read(255, "#!/bin/bash\nreset\nwhile [ 1 ] ; "..., 124) = 124
> rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
> stat64(".", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
> stat64("/root/bin/reset", 0xaf86e160)   = -1 ENOENT (No such file or
> directory)
> stat64("/usr/java/bin/reset", 0xaf86e160) = -1 ENOENT (No such file or
> directory)
> stat64("/usr/bin/reset", {st_mode=S_IFREG|0755, st_size=36216, ..}) = 0
> stat64("/usr/bin/reset", {st_mode=S_IFREG|0755, st_size=36216, ..}) = 0
> rt_sigprocmask(SIG_BLOCK, [INT CHLD], [], 8) = 0
> _llseek(255, -106, [18], SEEK_CUR)      = 0
> clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|
> SIGCHLD, child_tidptr=0xa7f480c8) = 6558
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigaction(SIGINT, {0x8074990, [], 0}, {SIG_DFL}, 8) = 0
> waitpid(-1, tset: standard error: Inappropriate ioctl for device
>
> [{WIFEXITED(s) && WEXITSTATUS(s) == 1}], 0) = 6558
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> --- SIGCHLD (Child exited) @ 0 (0) ---
> waitpid(-1, 0xaf86dee8, WNOHANG)        = -1 ECHILD (No child processes)
> sigreturn()                             = ? (mask now [])
> rt_sigaction(SIGINT, {SIG_DFL}, {0x8074990, [], 0}, 8) = 0
> rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
> read(255, "while [ 1 ] ; do\n\n   netstat -a "..., 124) = 106
> rt_sigprocmask(SIG_BLOCK, NULL, [], 8)  = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
> pipe([3, 4])                            = 0
> rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
> _llseek(255, -1, [123], SEEK_CUR)       = 0
> clone(tset: standard error: Inappropriate ioctl for device
>
> tset: standard error: Inappropriate ioctl for device
>
> child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD,
> child_tidptr=0xa7f480c8) = 6559
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> close(4)                                = 0
> close(4)                                = -1 EBADF (Bad file descriptor)
> rt_sigprocmask(SIG_BLOCK, [INT CHLD], [CHLD], 8) = 0
> clone(child_stack=0, flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|
> SIGCHLD, child_tidptr=0xa7f480c8) = 6580
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> close(3)                                = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
> rt_sigprocmask(SIG_SETMASK, [CHLD], NULL, 8) = 0
> rt_sigprocmask(SIG_BLOCK, [CHLD], [CHLD], 8) = 0
> rt_sigaction(SIGINT, {0x8074990, [], 0}, {SIG_DFL}, 8) = 0
> waitpid(-1, tset: standard error: Inappropriate ioctl for device
>
> tset: standard error: Inappropriate ioctl for device
>
> tset: standard error: Inappropriate ioctl for device
>
> tset: standard error: Inappropriate ioctl for device
> ---------------------
> And theres a couple more megabytes of that last line till I ctl+c'd it.
> I did that when gkrellm said it was up to about 990 processes from the
> normal 220 or so here.
>
> But I have NDI what it all _really_ means.  And I just built and
> rebooted to 2.6.16.1 with no change in this seemingly weird behaviour.
>
> Thanks all
>
> --
> Cheers, Gene

The error message comes from `tset`. Some script that runs on startup
of each of your 990 processes is trying to set a terminal when, in
fact, there is no terminal associated with the task. Perhaps, your
new java script is doing something????


Perhaps associated with this little gem:

read(255, "while [ 1 ] ; do\n\n   netstat -a "..., 124) = 106


Cheers,
Dick Johnson
Penguin : Linux version 2.6.15.4 on an i686 machine (5589.42 BogoMips).
Warning : 98.36% of all statistics are fiction, book release in April.
_


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