Glenn, David, can you replicate the bug?
2009/10/28 ольга крыжановская <[email protected]>:
> Just came through the shell list on opensolaris.org.
> I can confirm that the bug occurs for simple statements like:
> fle...@meridian:~/ksh93/docsvn/doc$ (while true ; do true | true ;
> done)
> ^Z^Z^Z^Z^Z^C
>
> fle...@meridian:~/ksh93/docsvn/doc$ jobs
> [1] + Stopped(SIGTTOU) (while true ; do true | true ; done)
>
> Multiple attempts to stop the process failed and the ^C didn't kill
> it. The process is hanging in a ioctl() call:
> fle...@meridian:~/ksh93/docsvn/doc$ pstack 27378
> 27378: -ksh93
> ffffffff7f0c7c70 ioctl (2, 7415, ffffffff7fffb38c)
> ffffffff7d94a4c0 job_set (100125680, ffffffff7daa9720, 3720, 7067,
> 15bbd4, 3400) + 98
> ffffffff7d94bce8 job_wait (7067, 7067, 0, 0, 0, 0) + 1b4
> ffffffff7d983d74 sh_exec (0, ffffffff7ecee3e8, 1001232e0,
> ffffffff7daa8f08, 7067, 100000000) + 2d14
> ffffffff7d98428c sh_exec (48e, 20a, 48e, ffffffff7fffccd0, 2, 100109790) +
> 322c
> ffffffff7d984db8 sh_exec (0, 1, 0, 4, 0, 0) + 3d58
> ffffffff7d97d1c0 sh_subshell (100109580, 4, 4, 4, 4, 3400) + 5c8
> ffffffff7d984030 sh_exec (4, 24, 0, a0, 0, 100109550) + 2fd0
> ffffffff7d95c0f4 exfile (ffffffff7daa8f08, ffffffff7daa8f08,
> 100109550, 24, 34, 34) + be8
> ffffffff7d95b4f0 sh_main (20, 840a01210030, 0, ffffffff7daa8f08, 0,
> ffffffff7daa6000) + c80
> 0000000100000d58 main (1, ffffffff7ffffc98, ffffffff7ffffca8, 1f3ee8,
> 1c80, 10000) + 44
> 0000000100000cfc _start (0, 0, 0, 0, 0, 0) + 17c
>
> ---------- Forwarded message ----------
> From: Kyle McDonald <[email protected]>
> Date: Oct 28, 2009 6:35 PM
> Subject: [osol-discuss] KSH93 problem?
> To: [email protected], opensolaris-discuss
> <[email protected]>
>
>
> [Resend to opensolaris-discuss too.]
>
> Hi!
>
> Yesterday while debugging a shell script I think I may have found a bug
> in ksh93 from sNV b124.
>
> The script is basically checking a large list of DNS hostnames for ones
> that already end in a '.'. I've boiled it down to a simpler test case:
>
> while true; do if ! echo gretsch-p21-396 | grep '\.$'; then true; else
> echo false; fi; done
>
> If I run the above line at the shell prompt, for a long period of time I
> get no ouput at all, which is to be expected. However, pretty regularly
> rhe shell will be 'stopped' (as if I'd hit CTRL-Z) and I'll be returned
> to my login shell.
>
> If I continue the test by typing 'fg', then eventually, that 'if'
> statement will actually echo 'false' to stdout. In my original script
> that was having issues, I only ever saw the 'if' take the wrong path,
> and I never saw this 'Stopped' problem. What could cause the system to
> send 'SIGSTOP' to the ksh93 process?
>
> Here is a sample:
>
>
>> >while true; do if ! echo gretsch-p21-396 | grep '\.$'; then true; else echo
>> >false; fi; done
>> [1]+ Stopped ksh93
>> 37>fg
>> ksh93
>> false
>>
>> [1]+ Stopped ksh93
>> 38>fg
>> ksh93
>>
>> [1]+ Stopped ksh93
>> 39>fg
>> ksh93
>>
>> [1]+ Stopped ksh93
>> 40>fg
>> ksh93
>>
>> [1]+ Stopped ksh93
>> 41>fg
>> ksh93
>>
>> [1]+ Stopped ksh93
>> 42>fg
>> ksh93
>>
>> [1]+ Stopped ksh93
>> 43>
>>
> Is it me, or is this wierd?
>
> -Kyle
>
>
>
> _______________________________________________
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>
>
> --
> , _ _ ,
> { \/`o;====- Olga Kryzhanovska -====;o`\/ }
> .----'-/`-/ [email protected] \-`\-'----.
> `'-..-| / Solaris/BSD//C/C++ programmer \ |-..-'`
> /\/\ /\/\
> `--` `--`
>
--
, _ _ ,
{ \/`o;====- Olga Kryzhanovska -====;o`\/ }
.----'-/`-/ [email protected] \-`\-'----.
`'-..-| / Solaris/BSD//C/C++ programmer \ |-..-'`
/\/\ /\/\
`--` `--`
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