NetBSD Problem Report #40088

From www@NetBSD.org  Wed Dec  3 00:52:55 2008
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Date: Wed,  3 Dec 2008 00:52:55 +0000 (UTC)
From: chris@dokein.co.uk
Reply-To: chris@dokein.co.uk
To: gnats-bugs@NetBSD.org
Subject: uvm_fault while using tmpfs
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>Number:         40088
>Category:       kern
>Synopsis:       crash while using tmpfs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    rmind
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Dec 03 00:55:00 +0000 2008
>Closed-Date:    Sun May 29 22:45:57 +0000 2011
>Last-Modified:  Sun May 29 22:45:57 +0000 2011
>Originator:     Chris Gilbert
>Release:        NetBSD -current 2008-12-02
>Organization:
>Environment:
NetBSD 5.99.4 NetBSD 5.99.4 (GENERIC) #3: Tue Dec  2 21:32:04 GMT 2008  root@:/usr/obj/sys/arch/amd64/compile/GENERIC amd64

>Description:
While building on a 24 core machine (having just disabled 12 cores) tmpfs generated a uvm_fault:
uvm_fault(0xffff80012b442e70, 0x0, 1) -> e
fatal page fault in supervisor mode
trap type 6 code 0 rip ffffffff804471b7 cs 8 rflags 10286 cr2  10 cpl 7 rsp ffff80012a5f3840

db{4}> bt
turnstile_block() at netbsd:turnstile_block+0x147
mutex_vector_enter() at netbsd:mutex_vector_enter+0x318
tmpfs_alloc_vp() at netbsd:tmpfs_alloc_vp+0x29
tmpfs_lookup() at netbsd:tmpfs_lookup+0x17d
VOP_LOOKUP() at netbsd:VOP_LOOKUP+0x63
getcwd_common() at netbsd:getcwd_common+0x304
sys___getcwd() at netbsd:sys___getcwd+0xc3
syscall() at netbsd:syscall+0xb6

I mounted tmpfs as:
mount -t tmpfs tmpfs /tmpfs

The server has 64GB of RAM.  At the time it tmpfs had a full source and objdir on it.

The server also has no Swap configured, so no dump was made.

No ECC errors are shown in the iLO/IML logs.
>How-To-Repeat:
build and delete multiple builds.

I'd probably done ~6 builds on the server before the panic happened.

Note that I'd ctrl^C'd the currently running build, which had just started.

>Fix:

>Release-Note:

>Audit-Trail:

From: "Mindaugas Rasiukevicius" <rmind@netbsd.org>
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/40088 CVS commit: src/sys/fs/tmpfs
Date: Sun, 29 May 2011 22:29:08 +0000

 Module Name:	src
 Committed By:	rmind
 Date:		Sun May 29 22:29:07 UTC 2011

 Modified Files:
 	src/sys/fs/tmpfs: tmpfs.h tmpfs_subr.c tmpfs_vfsops.c tmpfs_vnops.c

 Log Message:
 - Rework and document inode reference counting.  Also document inode life
   cycle (destruction part).  Perform link counting in tmpfs_dir_attach()
   and tmpfs_dir_detach(), instead of alloc/free and arbitrary places.
   Fixes PR/44285, PR/44288, PR/44657 and likely PR/42484.

 - Fix the race between the lookup and inode destruction.  Fixes PR/43167
   and its duplicates PR/40088, PR/40757.

 - Improve tmpfs_rename() locking a little, fix kqueue event notifications
   and also fix PR/43617.  Add simplistic tmpfs_parentcheck_p(); to be
   expanded and used for further rename() locking fixes.

 - Cache directory entry "hint" in the tmpfs node, add tmpfs_dir_cached(),
   and thus avoid unnecessary lookup in tmpfs_remove() and tmpfs_rmdir().

 - Set correct _PC_FILESIZEBITS value in tmpfs_pathconf().  Fixes PR/43576.

 - Few minor fixes.


 To generate a diff of this commit:
 cvs rdiff -u -r1.43 -r1.44 src/sys/fs/tmpfs/tmpfs.h
 cvs rdiff -u -r1.70 -r1.71 src/sys/fs/tmpfs/tmpfs_subr.c
 cvs rdiff -u -r1.50 -r1.51 src/sys/fs/tmpfs/tmpfs_vfsops.c
 cvs rdiff -u -r1.84 -r1.85 src/sys/fs/tmpfs/tmpfs_vnops.c

 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

Responsible-Changed-From-To: kern-bug-people->rmind
Responsible-Changed-By: rmind@NetBSD.org
Responsible-Changed-When: Sun, 29 May 2011 22:45:57 +0000
Responsible-Changed-Why:


State-Changed-From-To: open->closed
State-Changed-By: rmind@NetBSD.org
State-Changed-When: Sun, 29 May 2011 22:45:57 +0000
State-Changed-Why:
Fixed, thanks.


>Unformatted:

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