[Wren]

Here it is.

Tue Mar 14 14:37:50 2006
panic(cpu 0 caller 0x000E83F4): vnode_put(2a487bc): iocount < 1
Latest stack backtrace for cpu 0:
Backtrace:
0x00095718 0x00095C30 0x0002683C 0x000E83F4 0x000E83A0 0x000D4E18 0x002AA2E4 0x000ABEB0
0x44524546
Proceeding back via exception chain:
Exception state (sv=0x302C0280)
PC=0x9001C220; MSR=0x0000F030; DAR=0x0025B000; DSISR=0x42000000; LR=0x90B14D34; R1=0xF14258C0; XCP=0x00000030 (0xC00 - System call)

Kernel version:
Darwin Kernel Version 8.5.0: Sun Jan 22 10:38:46 PST 2006; root:xnu-792.6.61.obj~1/RELEASE_PPC
*********


that's it. No Kernel loadable modules in backtrace (with dependencies) line that I can check. Just that.

It's a dual 2.7 gHz Power Mac G5, running OS X Server 10.4.5 (haven't run the latest security update yet) with 1 gig of ram.

I was just in the Finder navigating to a file when I got the restart your machine message.

Apple File Service and Windows Service are running within Server, along with Photoshop CS2 and Frontier.

Attached to the machine via SCSI is a Medea Videoraid RTR (though I had a similar panic 2 weeks ago before I hooked up the raid.)

Can someone translate my log for me, please?

Thanks.

[stubertio]

Hi, I'm getting this problem at a couple of sites. According to a colleague, it's a problem that affects dual processor machines.
We've been trying the following, from an Apple technote, with great success:

http://developer.apple.com/qa/qa2001/qa1141.html

Give it a go and let us know if it helps.

How often do you suffer these panics? We were seeing them every few minutes on one machine.

Stu

[Big Mac]

Disabling a processor isn't a very good fix.

[stubertio]

admitted, it's not the best solution but it's the only *workaround* that works other than compiling your own kernel with the patch to fix things permanently. Hopefully, Apple will fix this in 10.4.6.
s

[Thomas_MacFreak]

I just experienced this KP today (see machine specs in signature).

Code:
Tue Mar 28 13:44:37 2006
panic(cpu 0 caller 0x000E83F4): vnode_put(3106318): iocount < 1
Latest stack backtrace for cpu 0:
      Backtrace:
         0x00095718 0x00095C30 0x0002683C 0x000E83F4 0x000E83A0 0x000D4E18 0x002AA2E4 0x000ABEB0 
         0x00000000 
Proceeding back via exception chain:
   Exception state (sv=0x4609C780)
      PC=0x9001C220; MSR=0x0000F030; DAR=0x09822678; DSISR=0x40000000; LR=0x90B14D34; R1=0xF00FFA90; XCP=0x00000030 (0xC00 - System call)

Kernel version:
Darwin Kernel Version 8.5.0: Sun Jan 22 10:38:46 PST 2006; root:xnu-792.6.61.obj~1/RELEASE_PPC
*********

I found the following in the Apple Mailing Lists. I think I will wait for Apple to release 10.4.6, before I try this, hehe

Originally Posted by Roman Zippel

If you can compile your own kernel, you can try the attached patch.
The problem is insufficient locking, so that hfs_getnewvnode() is
entered from two cpus and modification to the node are lost.
I sent this patch also to Apple, but so far there has been no reaction,
so I don't know if this will be fixed in 10.4.3.

bye, Roman

Code:
diff -pur xnu-792.2.4.org/bsd/hfs/hfs_vnops.c xnu-792.2.4/bsd/hfs/hfs_vnops.c
--- xnu-792.2.4.org/bsd/hfs/hfs_vnops.c	2005-07-12 23:36:53.000000000 +0200
+++ xnu-792.2.4/bsd/hfs/hfs_vnops.c	2005-10-12 19:18:20.000000000 +0200
@@ -267,7 +267,7 @@ hfs_vnop_getattr(struct vnop_getattr_arg
 	enum vtype v_type;
 	int error = 0;
 
-	if ((error = hfs_lock(VTOC(vp), HFS_SHARED_LOCK))) {
+	if ((error = hfs_lock(VTOC(vp), HFS_EXCLUSIVE_LOCK))) {
 		return (error);
 	}
 	cp = VTOC(vp);

http://lists.apple.com/archives/darw.../msg00075.html

[Big Mac]

If this is a general dual-CPU issue, why aren't more of us experiencing it?

[Catfish_Man]

Originally Posted by Big Mac

If this is a general dual-CPU issue, why aren't more of us experiencing it?

Threading issues are often highly irregular. I wouldn't be surprised if this is one of those things that's like "1% of the time, this certain disk operation will fail on dual processor machines".

[mudomac]

I am facing the same problem also...It all started after I installed the OS 10.4.5, this is the second time and I dont know what to do?!