Bug 9504

Summary: binfmt_misc file system is empty
Product: File System Reporter: Marcus Better (marcus)
Component: OtherAssignee: Rafael J. Wysocki (rjwysocki)
Status: CLOSED CODE_FIX    
Severity: normal CC: ebiederm, rjwysocki
Priority: P1    
Hardware: All   
OS: Linux   
Kernel Version: 2.6.24-rc4 Subsystem:
Regression: Yes Bisected commit-id:
Bug Depends on:    
Bug Blocks: 9243    
Attachments: kernel config
diff-proc-shadow-lookup

Description Marcus Better 2007-12-05 02:35:42 UTC 
Most recent kernel where this bug did not occur: 2.6.24-rc3 (probably)
Distribution: Debian
Hardware Environment: Two laptops, i386 and x86_64
Software Environment: Debian testing/unstable
Problem Description:

The /proc/sys/fs/binfmt_misc/ directory is empty. The "register" and "status" files seem to have disappeared.

~$ ls /proc/sys/fs/binfmt_misc/
~$ mount | grep binfmt_misc
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
~$
Comment 1 Marcus Better 2007-12-05 02:36:49 UTC 
Created attachment 13859 [details]
kernel config

Maybe I messed up the kernel config? But it seems ok to me.
Comment 2 Anonymous Emailer 2007-12-05 04:03:06 UTC 
Reply-To: akpm@linux-foundation.org

thanks, I bisected it down to 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416
Comment 3 Denis V. Lunev 2007-12-05 14:22:46 UTC 
Created attachment 13876 [details]
diff-proc-shadow-lookup
Comment 4 Rafael J. Wysocki 2007-12-05 16:23:21 UTC 
Marcus, please mark the bug as a regression, thanks.
Comment 5 Rafael J. Wysocki 2007-12-07 11:27:51 UTC 
Commit 2b1e300a9dfc3196ccddf6f1d74b91b7af55e416 also causes other problems that aren't fixed by the patch from Comment #3 (http://lkml.org/lkml/2007/12/6/409).
Comment 6 Rafael J. Wysocki 2007-12-07 12:12:23 UTC 
*** Bug 9523 has been marked as a duplicate of this bug. ***
Comment 7 Rafael J. Wysocki 2007-12-08 14:21:13 UTC 
Patch is available: http://lkml.org/lkml/2007/12/7/364
Comment 8 Rafael J. Wysocki 2007-12-11 16:21:23 UTC 
Fixed by:

commit 3790ee4bd86396558eedd86faac1052cb782e4e1
Author: Eric W. Biederman <ebiederm@xmission.com>
Date:   Mon Dec 10 15:49:36 2007 -0800

    proc: remove/Fix proc generic d_revalidate

http://git.kernel.org/gitweb.cgi?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=3790ee4bd86396558eedd86faac1052cb782e4e1