difference of a shell script versus command line WRT "winch_thread : TIOCSCTTY failed on fd 1 err = 1"

uml-devel Toralf Förster 3 participants 5 messages Sep 16, 2013 – Sep 22, 2013 User-mode Linux (UML)

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Toralf Förster

author

2013-09-16 20:05 UTC #0 lore raw

If I run the following script

$> cat l.sh
#!/bin/sh
#

/usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4

then during start of the UML I get

...
Netdevice 0 (72:ef:3d:5d:d3:db) :
TUN/TAP backend -
winch_thread : TIOCSCTTY failed on fd 1 err = 1
EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
...

whereas the command - if directly run in the terminal - don't show that line. Now I'm wondering what makes the difference and what's the correct way to start an UML.

Signature · 14 lines

MfG/Sincerely
Toralf Förster
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richard -rw- weinberger

2013-09-22 06:52 UTC #1 lore raw

Quoted 9 lines · Toralf Förster

If I run the following script
$> cat l.sh
#!/bin/sh
#
/usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4

Quoted 6 lines

then during start of the UML I get
...
Netdevice 0 (72:ef:3d:5d:d3:db) :
TUN/TAP backend -
winch_thread : TIOCSCTTY failed on fd 1 err = 1

Hmm, that's a regression introduced by:
commit 250127216dd6635f5730752d7444bdec992aecb0

Author: Richard Weinberger <[email protected]>
Date:   Sun Aug 18 13:30:09 2013 +0200

um: Run UML in it's own session.

If UML is not run by a shell it can happen that UML will kill unrelated proceses upon a fatal exit because it issues a kill(0, ...).
To prevent such oddities we create a new session in main().

Reported-and-tested-by Richard W.M. Jones <[email protected]>

Signed-off-by Richard Weinberger <[email protected]>

The winch-thread also has it's own session, this seems to be to an issue.

Signature · 13 lines

Thanks,
//richard

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Toralf Förster

author

2013-09-22 08:27 UTC #2 lore raw

Quoted 29 lines · richard -rw- weinberger

Quoted 9 lines · Toralf Förster
If I run the following script
$> cat l.sh
#!/bin/sh
#
/usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4
Quoted 6 lines
then during start of the UML I get
...
Netdevice 0 (72:ef:3d:5d:d3:db) :
TUN/TAP backend -
winch_thread : TIOCSCTTY failed on fd 1 err = 1
Hmm, that's a regression introduced by:
commit 250127216dd6635f5730752d7444bdec992aecb0
Author: Richard Weinberger <[email protected]>
Date:   Sun Aug 18 13:30:09 2013 +0200
um: Run UML in it's own session.
If UML is not run by a shell it can happen that UML will kill unrelated proceses upon a fatal exit because it issues a kill(0, ...).
To prevent such oddities we create a new session in main().

Quoted 6 lines

Reported-and-tested-by Richard W.M. Jones <[email protected]>
Signed-off-by Richard Weinberger <[email protected]>
The winch-thread also has it's own session, this seems to be to an issue.

sure - I can reproduce it with linux-v3.11-8718-g0fb5ca1 , which doesn't contain that commit, or ?

Signature · 14 lines

MfG/Sincerely
Toralf Förster
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Toralf Förster

author

2013-09-22 09:20 UTC #3 lore raw

Quoted 30 lines · Toralf Förster

Quoted 29 lines · richard -rw- weinberger
Quoted 9 lines · Toralf Förster
If I run the following script
$> cat l.sh
#!/bin/sh
#
/usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4
Quoted 6 lines
then during start of the UML I get
...
Netdevice 0 (72:ef:3d:5d:d3:db) :
TUN/TAP backend -
winch_thread : TIOCSCTTY failed on fd 1 err = 1
Hmm, that's a regression introduced by:
commit 250127216dd6635f5730752d7444bdec992aecb0
Author: Richard Weinberger <[email protected]>
Date:   Sun Aug 18 13:30:09 2013 +0200
um: Run UML in it's own session.
If UML is not run by a shell it can happen that UML will kill unrelated proceses upon a fatal exit because it issues a kill(0, ...).
To prevent such oddities we create a new session in main().

Quoted 9 lines

Quoted 6 lines
Reported-and-tested-by Richard W.M. Jones <[email protected]>
Signed-off-by Richard Weinberger <[email protected]>
The winch-thread also has it's own session, this seems to be to an issue.
sure - I can reproduce it with linux-v3.11-8718-g0fb5ca1 , which doesn't contain that commit, or ?

I'd like to bisect iit,k but as soon as I run something like $> ./l.sh | tee >logfile>
then the issue vanishes - so I can see it on the command line. Furthermore I know, that it is not in 3.10.0-08763-g7d3107d, but in v3.12-rc1-42-gf42bcf1 - but without automation bisecting is not funny.

Signature · 14 lines

MfG/Sincerely
Toralf Förster
pgp finger print: 7B1A 07F4 EC82 0F90 D4C2 8936 872A E508 7DB6 9DA3

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Richard Weinberger

maintainer

2013-09-22 10:32 UTC #4 lore raw

Am 22.09.2013 11:20, schrieb Toralf Förster:

Quoted 38 lines · Toralf Förster

Quoted 37 lines · richard -rw- weinberger
Quoted 35 lines · Toralf Förster
Quoted 9 lines
If I run the following script
$> cat l.sh
#!/bin/sh
#
/usr/local/bin/linux-v3.11-8718-g0fb5ca1 earlyprintk ubda=/home/tfoerste/virtual/uml/n22unst4 ubdb=/mnt/ramdisk/n22unst4_swap eth0=tuntap,tap2,72:ef:3d:5d:d3:db mem=1025M con0=fd:0,fd:1 con=pts umid=uml_n22unst4 rootfstype=ext4
Quoted 6 lines
then during start of the UML I get
...
Netdevice 0 (72:ef:3d:5d:d3:db) :
TUN/TAP backend -
winch_thread : TIOCSCTTY failed on fd 1 err = 1
Hmm, that's a regression introduced by:
commit 250127216dd6635f5730752d7444bdec992aecb0
Author: Richard Weinberger <[email protected]>
Date:   Sun Aug 18 13:30:09 2013 +0200
um: Run UML in it's own session.
If UML is not run by a shell it can happen that UML will kill unrelated proceses upon a fatal exit because it issues a kill(0, ...).
To prevent such oddities we create a new session in main().
Reported-and-tested-by Richard W.M. Jones <[email protected]>
Signed-off-by Richard Weinberger <[email protected]>
The winch-thread also has it's own session, this seems to be to an issue.

Quoted 7 lines

Quoted 2 lines
sure - I can reproduce it with linux-v3.11-8718-g0fb5ca1 , which doesn't contain that commit, or ?
I'd like to bisect iit,k but as soon as I run something like $> ./l.sh | tee >logfile>
then the issue vanishes - so I can see it on the command line. Furthermore I know, that it is not in 3.10.0-08763-g7d3107d, but in v3.12-rc1-42-gf42bcf1 - but without automation bisecting is not funny.

Why bisect? Commit 2501272 is the evildoer.
Now I have to find a sane way to fix the kill(0,...) issue without breaking the winch-thread.

Thanks,
//richard

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