devfs breakage in 2.4.0 release

devfs breakage in 2.4.0 release

[Andris Pavenis]

[-- Attachment #1: Type: text/plain, Size: 1128 bytes --]

Noticed following devfs related problems with kernel version 2.4.0 on one 
Pentium 200MMX box (the same problem with 2.4.0-ac2, but earlier 2.4.0-test10 
doesn't have this problem)

I was able to reproduce it reliably by following steps:
         - booted machine in runlevel 3
         - logged in as user and started MC (on first console)
         - logged out
         - logged in as different user (in this case root) and tried to start 
	MC again

This time it hangs. The source of problem appears to be devfs related as 
devfsd exited with error message that it cannot state vcc/1 as there is no 
such file or directory. Related parts of log files (boot parameter devfs=dall)
and other related information (I hope...) is in attachment. Of course MC is 
not behaving nicely, but the primary source of problem seems to be devfs

On this machine kernel was compiled for Pentium CPUs. I tried to reproduce 
the same on a different machine with Pentium III 700 using kernel 2.4.0.
It took more relogging as on Pentium 200, but I got the same problem once
(on slower machine I was able to reproduce it more reliably). 

Andris


[-- Attachment #2: devfs.err.gz --]
[-- Type: application/x-gzip, Size: 19580 bytes --]

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Re: devfs breakage in 2.4.0 release

[Adam J. Richter]

	On my Sony PictureBook PCG-C1VN, 2.4.0 hangs in the boot
process while 2.4.0-prerelease boots just fine.  At first I thought
the problem was devfs-related, but skipping devfsd just caused the
hang to occur a little later, this time in ifconfig.  The kernel
call trace looked something like this:

	neigh_ifdown
	sys_ioctl
	sock_ioctl
	[some addresses in modules]
	stext_lock
	__down_failed
	__down

	What surprised me more was that attempting to remount the
root filesystem for writing just before this (to record the module
kernel symbols) caused a kenel BUG() in slab.c:1542 becuase kmalloc
was being called with a huge negative number.

	I know I could run ksymoops to get this trace, but I now
think the cause of the problem probably happens much earlier than
the symptoms.  So, I trying backing out different 2.4.0 changes.
So far, I can tell you that reverting the linux/mm subdirectory to
its 2.4.0-prerelease contents had no effect.  I will let you know
if I diagnose or fix the problem, as I think you may be experiencing
the same problem.

Adam J. Richter     __     ______________   4880 Stevens Creek Blvd, Suite 104
adam@yggdrasil.com     \ /                  San Jose, California 95129-1034
+1 408 261-6630         | g g d r a s i l   United States of America
fax +1 408 261-6631      "Free Software For The Rest Of Us."
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Re: devfs breakage in 2.4.0 release

[Andris Pavenis]

On Sat, 6 Jan 2001, Adam J. Richter wrote:

> 	On my Sony PictureBook PCG-C1VN, 2.4.0 hangs in the boot
> process while 2.4.0-prerelease boots just fine.  At first I thought
> the problem was devfs-related, but skipping devfsd just caused the
> hang to occur a little later, this time in ifconfig.  The kernel
> call trace looked something like this:
> 
> 	neigh_ifdown
> 	sys_ioctl
> 	sock_ioctl
> 	[some addresses in modules]
> 	stext_lock
> 	__down_failed
> 	__down
> 
> 	What surprised me more was that attempting to remount the
> root filesystem for writing just before this (to record the module
> kernel symbols) caused a kenel BUG() in slab.c:1542 becuase kmalloc
> was being called with a huge negative number.
> 
> 	I know I could run ksymoops to get this trace, but I now
> think the cause of the problem probably happens much earlier than
> the symptoms.  So, I trying backing out different 2.4.0 changes.
> So far, I can tell you that reverting the linux/mm subdirectory to
> its 2.4.0-prerelease contents had no effect.  I will let you know
> if I diagnose or fix the problem, as I think you may be experiencing
> the same problem.

I think it's a different problem. I reproduced the same with 2.4.0-test12
but not 2.4.0-test10. 

There are changes (not very large) in fs/devfs/base.c between
these versions. I tried to take 2.4.0 and change back these updates and 
saw that it doesn't fix the problem. Trying all prerelaeses between
2.4.0-test10 and 2.4.0-test12 perhaps would take too much time ... 

There is no hanging (or crashes) at all for me. All these versions
boots Ok for me, but what I have is devfsd quitting with error message
that it cannot state /dev/vcc/[1-6] after some relooging from the same
terminal.

Andris



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Re: devfs breakage in 2.4.0 release

[Andris Pavenis]

On Saturday 06 January 2001 15:28, Andris Pavenis wrote:
> Noticed following devfs related problems with kernel version 2.4.0 on one
> Pentium 200MMX box (the same problem with 2.4.0-ac2, but earlier
> 2.4.0-test10 doesn't have this problem)
>
> I was able to reproduce it reliably by following steps:
>          - booted machine in runlevel 3
>          - logged in as user and started MC (on first console)
>          - logged out
>          - logged in as different user (in this case root) and tried to
> start MC again
>
> This time it hangs. The source of problem appears to be devfs related as
> devfsd exited with error message that it cannot state vcc/1 as there is no
> such file or directory. Related parts of log files (boot parameter
> devfs=dall) and other related information (I hope...) is in attachment. Of
> course MC is not behaving nicely, but the primary source of problem seems
> to be devfs

As I tested devfsd dies after I'm logging out (very often on P200MMX,
much more seldom on P3 700). I suspect some devfs related race

> On this machine kernel was compiled for Pentium CPUs. I tried to reproduce
> the same on a different machine with Pentium III 700 using kernel 2.4.0.
> It took more relogging as on Pentium 200, but I got the same problem once
> (on slower machine I was able to reproduce it more reliably).
>

I tries 2.4.1-pre3 and got the same. Modifying devfsd.c to retry stating
some times before giving up workarounds the problem (As far as I tested 
I'm getting only one retry ...)

Perhaps it's kernel's bug anyway, but I think it's doesn't harm to make
devfsd slightly more errorproof. I'm including patch for devfsd (I had also 
to define __USE_GNU to get devfsd compile with glibc-2.2 at all ...)

Of course best solution would be to fix the race itself (it appeared sometimes
between 2.4.0-test10 and 2.4.0-test12, first one is OK) ....

Andris

--- devfsd/devfsd.c~1	Mon Jul  3 22:43:07 2000
+++ devfsd/devfsd.c	Fri Jan 12 13:19:33 2001
@@ -189,6 +189,7 @@
 #include <signal.h>
 #include <regex.h>
 #include <errno.h>
+#define __USE_GNU
 #include <dlfcn.h>
 #include <rpcsvc/ypclnt.h>
 #include <rpcsvc/yp_prot.h>
@@ -918,15 +919,29 @@
     [RETURNS] Nothing.
 */
 {
+    int tries=0;
     mode_t new_mode;
     struct stat statbuf;
 
+Retry:   
     if (lstat (info->devname, &statbuf) != 0)
     {
-	SYSLOG (LOG_ERR, "error stat(2)ing: \"%s\"\t%s\n",
-		info->devname, ERRSTRING);
-	SYSLOG (LOG_ERR, "exiting\n");
-	exit (1);
+	if (tries<10)
+	{
+	   tries++;
+           SYSLOG (LOG_ERR, "error stat(2)ing: \"%s\"\t%s\n",
+	   	   info->devname, ERRSTRING);
+           SYSLOG (LOG_ERR, "retrying (attempt %d) ...\n",tries);
+	   usleep (1000);  /* Let's sleep a bit  */
+	   goto Retry;
+	}
+	else
+	{
+	   SYSLOG (LOG_ERR, "error stat(2)ing: \"%s\"\t%s\n",
+	   	   info->devname, ERRSTRING);
+	   SYSLOG (LOG_ERR, "exiting\n");
+	   exit (1);
+	}
     }
     new_mode = (statbuf.st_mode & S_IFMT) |
 	(entry->u.permissions.mode & ~S_IFMT);

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Re: devfs breakage in 2.4.0 release

[Andris Pavenis]

On Friday 12 January 2001 13:35, Andris Pavenis wrote:
> On Saturday 06 January 2001 15:28, Andris Pavenis wrote:
> > Noticed following devfs related problems with kernel version 2.4.0 on one
> > Pentium 200MMX box (the same problem with 2.4.0-ac2, but earlier
> > 2.4.0-test10 doesn't have this problem)
> >
> > I was able to reproduce it reliably by following steps:
> >          - booted machine in runlevel 3
> >          - logged in as user and started MC (on first console)
> >          - logged out
> >          - logged in as different user (in this case root) and tried to
> > start MC again
> >
> > This time it hangs. The source of problem appears to be devfs related as
> > devfsd exited with error message that it cannot state vcc/1 as there is
> > no such file or directory. Related parts of log files (boot parameter
> > devfs=dall) and other related information (I hope...) is in attachment.
> > Of course MC is not behaving nicely, but the primary source of problem
> > seems to be devfs
>
> As I tested devfsd dies after I'm logging out (very often on P200MMX,
> much more seldom on P3 700). I suspect some devfs related race
>
> > On this machine kernel was compiled for Pentium CPUs. I tried to
> > reproduce the same on a different machine with Pentium III 700 using
> > kernel 2.4.0. It took more relogging as on Pentium 200, but I got the
> > same problem once (on slower machine I was able to reproduce it more
> > reliably).
>
> I tries 2.4.1-pre3 and got the same. Modifying devfsd.c to retry stating
> some times before giving up workarounds the problem (As far as I tested
> I'm getting only one retry ...)
>
> Perhaps it's kernel's bug anyway, but I think it's doesn't harm to make
> devfsd slightly more errorproof. I'm including patch for devfsd (I had also
> to define __USE_GNU to get devfsd compile with glibc-2.2 at all ...)
>
> Of course best solution would be to fix the race itself (it appeared
> sometimes between 2.4.0-test10 and 2.4.0-test12, first one is OK) ....
>

I spent some time building various kernels on P200MMX box I have this problem
to happen more often. It looks that problem appears in 2.4.0-test12-pre8
but is not present in 2.4.0-test12-pre7

Andris
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Problems with devfs [WAS: Re: devfs breakage in 2.4.0 release]

[Andris Pavenis]

[-- Attachment #1: Type: text/plain, Size: 2988 bytes --]

On Tuesday 23 January 2001 10:25, Andris Pavenis wrote:
> On Friday 12 January 2001 13:35, Andris Pavenis wrote:
> > On Saturday 06 January 2001 15:28, Andris Pavenis wrote:
> > > Noticed following devfs related problems with kernel version 2.4.0 on
> > > one Pentium 200MMX box (the same problem with 2.4.0-ac2, but earlier
> > > 2.4.0-test10 doesn't have this problem)
> > >
> > > I was able to reproduce it reliably by following steps:
> > >          - booted machine in runlevel 3
> > >          - logged in as user and started MC (on first console)
> > >          - logged out
> > >          - logged in as different user (in this case root) and tried to
> > > start MC again
> > >
> > > This time it hangs. The source of problem appears to be devfs related
> > > as devfsd exited with error message that it cannot state vcc/1 as there
> > > is no such file or directory. Related parts of log files (boot
> > > parameter devfs=dall) and other related information (I hope...) is in
> > > attachment. Of course MC is not behaving nicely, but the primary source
> > > of problem seems to be devfs
> >
> > As I tested devfsd dies after I'm logging out (very often on P200MMX,
> > much more seldom on P3 700). I suspect some devfs related race
> >
> > > On this machine kernel was compiled for Pentium CPUs. I tried to
> > > reproduce the same on a different machine with Pentium III 700 using
> > > kernel 2.4.0. It took more relogging as on Pentium 200, but I got the
> > > same problem once (on slower machine I was able to reproduce it more
> > > reliably).
> >
> > I tries 2.4.1-pre3 and got the same. Modifying devfsd.c to retry stating
> > some times before giving up workarounds the problem (As far as I tested
> > I'm getting only one retry ...)
> >
> > Perhaps it's kernel's bug anyway, but I think it's doesn't harm to make
> > devfsd slightly more errorproof. I'm including patch for devfsd (I had
> > also to define __USE_GNU to get devfsd compile with glibc-2.2 at all ...)
> >
> > Of course best solution would be to fix the race itself (it appeared
> > sometimes between 2.4.0-test10 and 2.4.0-test12, first one is OK) ....
>
> I spent some time building various kernels on P200MMX box I have this
> problem to happen more often. It looks that problem appears in
> 2.4.0-test12-pre8 but is not present in 2.4.0-test12-pre7
>

Forgot to mention: I have line

REGISTER	vcc/a*		PERMISSIONS root.vcsa   rw-rw----
REGISTER	vcc/[0-9]	PERMISSIONS root.tty	rw-rw----

in /etc/devfsd.conf (to change permissions for vcc/* as I don't want to make
some applications suid root)

So perhaps after logout current of vcc/[0-9] is reregistered, but sometimes
devfsd suceeds to try to change permissions before the new node is created
and stat() fails (ENOENT) in action_permissions(), as result unpached 
devfsd-1.3.11 exits with error message. Adding code to retry stat() after 
some small delay (usleep(1000)) workarounds problem.

I'm including full /etc.devfsd in attachment.

Andris

[-- Attachment #2: devfsd.conf --]
[-- Type: text/plain, Size: 1519 bytes --]

# Sample /etc/devfsd.conf configuration file.
# Richard Gooch  <rgooch@atnf.csiro.au>		3-FEB-2000
#
# Enable full compatibility mode for old device names. You may comment these
# out if you don't use the old device names. Make sure you know what you're
# doing!
REGISTER	.*		MKOLDCOMPAT
UNREGISTER	.*		RMOLDCOMPAT

# You may comment out the above and uncomment the following if you've
# configured your system to use the original "new" devfs names or the really
# new names
#REGISTER        vc/.*           MKOLDCOMPAT
#UNREGISTER      vc/.*           RMOLDCOMPAT
#REGISTER        pty/.*          MKOLDCOMPAT
#UNREGISTER      pty/.*          RMOLDCOMPAT
#REGISTER        misc            MKOLDCOMPAT
#UNREGISTER      misc            RMOLDCOMPAT

# Enable module autoloading. You may comment this out if you don't use
# autoloading
LOOKUP		.*		MODLOAD

# You may comment these out if you don't use the original "new" names
REGISTER	.*		MKNEWCOMPAT
UNREGISTER	.*		RMNEWCOMPAT
#
#
REGISTER	floppy/*	PERMISSIONS root.floppy rw-rw----
REGISTER	sound/audio	PERMISSIONS root.sound  rw-rw----
REGISTER	sound/dsp	PERMISSIONS root.sound  rw-rw----
REGISTER	sound/dspW	PERMISSIONS root.sound  rw-rw----
REGISTER	sound/mixer	PERMISSIONS root.sound  rw-rw----
REGISTER	misc/psaux	EXECUTE /bin/ln -s /dev/misc/psaux /dev/mouse
REGISTER	vcc/a*		PERMISSIONS root.vcsa   rw-rw----
REGISTER	vcc/[0-9]	PERMISSIONS root.tty	rw-rw----
REGISTER	ide/host0/bus1/target0/lun0/cd EXECUTE /bin/ln -s /dev/ide/host0/bus1/target0/lun0/cd /dev/cdrom