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* nfs-utils: v3 mounts broken due to statx() returning EINVAL
@ 2019-10-08 20:23 Thomas Deutschmann
  2019-10-11 17:07 ` bfields
  0 siblings, 1 reply; 2+ messages in thread
From: Thomas Deutschmann @ 2019-10-08 20:23 UTC (permalink / raw)
  To: linux-nfs

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Hi,

we have some user reporting that NFS v3 mounts are broken
when using glibc-2.29 and linux-4.9.x (4.9.128) because
statx() with mask=STATX_BASIC_STATS returns EINVAL. 

Looks like this isn't happening with <nfs-utils-2.4.1 or
newer kernels.

The following workaround was confirmed to be working:

--- a/support/misc/xstat.c	2019-06-24 21:31:55.260371592 +0200
+++ b/support/misc/xstat.c	2019-06-24 21:32:29.098777436 +0200
@@ -47,6 +47,8 @@
 			statx_copy(statbuf, &stxbuf);
 			return 0;
 		}
+		if (errno == EINVAL)
+			errno = ENOSYS;
 		if (errno == ENOSYS)
 			statx_supported = 0;
 	} else


Bug: https://bugs.gentoo.org/688644

At the moment I have no clue whether this is kernel/glibc or
nfs-utils related; if the patch is safe to apply...

Any help is appreciated. Thanks!


-- 
Regards,
Thomas Deutschmann / Gentoo Linux Developer
C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5


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^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: nfs-utils: v3 mounts broken due to statx() returning EINVAL
  2019-10-08 20:23 nfs-utils: v3 mounts broken due to statx() returning EINVAL Thomas Deutschmann
@ 2019-10-11 17:07 ` bfields
  0 siblings, 0 replies; 2+ messages in thread
From: bfields @ 2019-10-11 17:07 UTC (permalink / raw)
  To: Thomas Deutschmann; +Cc: linux-nfs

On Tue, Oct 08, 2019 at 10:23:56PM +0200, Thomas Deutschmann wrote:
> Hi,
> 
> we have some user reporting that NFS v3 mounts are broken
> when using glibc-2.29 and linux-4.9.x (4.9.128) because
> statx() with mask=STATX_BASIC_STATS returns EINVAL. 
> 
> Looks like this isn't happening with <nfs-utils-2.4.1 or
> newer kernels.
> 
> The following workaround was confirmed to be working:
> 
> --- a/support/misc/xstat.c	2019-06-24 21:31:55.260371592 +0200
> +++ b/support/misc/xstat.c	2019-06-24 21:32:29.098777436 +0200
> @@ -47,6 +47,8 @@
>  			statx_copy(statbuf, &stxbuf);
>  			return 0;
>  		}
> +		if (errno == EINVAL)
> +			errno = ENOSYS;
>  		if (errno == ENOSYS)
>  			statx_supported = 0;
>  	} else
> 
> 
> Bug: https://bugs.gentoo.org/688644
> 
> At the moment I have no clue whether this is kernel/glibc or
> nfs-utils related; if the patch is safe to apply...

Well, sounds like nfs-utils started using statx in 2.4.1.  And just the
fact that varying the kernel version makes it sound like there was a
kernel bug causing an EINVAL return in this case, and that bug got
fixed.

One way to confirm might be running mount under strace and looking for
that EINVAL return.

I might also try looking through the kernel logs for nfs or the stat
code to see if there's a mention of this (didn't see it on a quick
look.)  Or try bisecting kernel versions to find the one where this was
fixed.

--b.

> 
> Any help is appreciated. Thanks!
> 
> 
> -- 
> Regards,
> Thomas Deutschmann / Gentoo Linux Developer
> C4DD 695F A713 8F24 2AA1 5638 5849 7EE5 1D5D 74A5
> 




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2019-10-08 20:23 nfs-utils: v3 mounts broken due to statx() returning EINVAL Thomas Deutschmann
2019-10-11 17:07 ` bfields

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