* devfs breakage in 2.4.0 release
@ 2001-01-06 13:28 Andris Pavenis
2001-01-12 11:35 ` Andris Pavenis
0 siblings, 1 reply; 4+ messages in thread
From: Andris Pavenis @ 2001-01-06 13:28 UTC (permalink / raw)
To: rgooch; +Cc: linux-kernel
[-- 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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: devfs breakage in 2.4.0 release
2001-01-06 13:28 devfs breakage in 2.4.0 release Andris Pavenis
@ 2001-01-12 11:35 ` Andris Pavenis
2001-01-23 8:25 ` Andris Pavenis
0 siblings, 1 reply; 4+ messages in thread
From: Andris Pavenis @ 2001-01-12 11:35 UTC (permalink / raw)
To: rgooch; +Cc: linux-kernel
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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: devfs breakage in 2.4.0 release
2001-01-12 11:35 ` Andris Pavenis
@ 2001-01-23 8:25 ` Andris Pavenis
2001-02-06 10:11 ` Problems with devfs [WAS: Re: devfs breakage in 2.4.0 release] Andris Pavenis
0 siblings, 1 reply; 4+ messages in thread
From: Andris Pavenis @ 2001-01-23 8:25 UTC (permalink / raw)
To: rgooch; +Cc: linux-kernel
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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^ permalink raw reply [flat|nested] 4+ messages in thread
* Problems with devfs [WAS: Re: devfs breakage in 2.4.0 release]
2001-01-23 8:25 ` Andris Pavenis
@ 2001-02-06 10:11 ` Andris Pavenis
0 siblings, 0 replies; 4+ messages in thread
From: Andris Pavenis @ 2001-02-06 10:11 UTC (permalink / raw)
To: rgooch; +Cc: linux-kernel
[-- 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
^ permalink raw reply [flat|nested] 4+ messages in thread
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2001-01-06 13:28 devfs breakage in 2.4.0 release Andris Pavenis
2001-01-12 11:35 ` Andris Pavenis
2001-01-23 8:25 ` Andris Pavenis
2001-02-06 10:11 ` Problems with devfs [WAS: Re: devfs breakage in 2.4.0 release] Andris Pavenis
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