Bug 502835 - vcc_sock_destruct: wmem leakage (2160 bytes) detected.
vcc_sock_destruct: wmem leakage (2160 bytes) detected.
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
low Severity high
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Assigned To: Kernel Maintainer List
Fedora Extras Quality Assurance
: Triaged
Depends On:
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Reported: 2009-05-27 08:28 EDT by lejeczek
Modified: 2009-12-18 04:29 EST (History)
2 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2009-12-18 04:29:42 EST
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RHEL 7.3 requirements from Atomic Host:
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Description lejeczek 2009-05-27 08:28:44 EDT
Description of problem:

I've noticed it after installing new hardware(mainboard) but it might have been there before.
It's random problem, but I think there is a pattern - namely when adsl connection bandwidth usage goes up this leakage occurs and my connection goes down, cannot remove/reload speedtouch module, cannot if it up, only way to fix it is to reboot
in error message number of bytes varies

Version-Release number of selected component (if applicable):

How reproducible:
I'm sorry I cannot give more details but I'd be happy to help so if you need me to do something, make it more verbose, get more feedback from the kernel or basically anything to debug it - let me know.

Steps to Reproduce:
Actual results:

Expected results:

Additional info:
installation updated to the last available rpms, I've marked - severity - as high because it is like this for my set-up
Comment 1 lejeczek 2009-05-29 16:14:40 EDT
bit more info on the issue,
tested hardware:

when is failing:
mobo - XFX mATX gForce 8300 + Athlon 7850 BE + mem Kingston KHX8500D2K2/4g (all four slots populated)
when is OK 
- when as above but CPU used is replaced with X2 4850e or BE-2350 - no above error

when is failing:
mobo - Asus M3N78-EM (gforce) + the same as above CPU and memory
when is OK
- when as above but CPU used is replaced with X2... ---||--- ---||---

to me it seems like a hardware bug???

if so - question - is it nvidia or CPU ?????

Comment 2 Chuck Ebbert 2009-05-31 13:41:33 EDT
I'd guess there is some kind of race happening that only gets hit with the faster CPU.

Google turns up this proposed patch which was never tested or applied:

--- linux-2.6.0-test9/net/atm/pppoatm.c.orig    2004-01-23 21:39:01.000000000 +0100
+++ linux-2.6.0-test9/net/atm/pppoatm.c 2004-01-23 21:41:34.000000000 +0100
@@ -238,8 +238,12 @@
        DPRINTK("(unit %d): atm_skb(%p)->vcc(%p)->dev(%p)\n",
            pvcc->chan.unit, skb, ATM_SKB(skb)->vcc,
-       return ATM_SKB(skb)->vcc->send(ATM_SKB(skb)->vcc, skb)
-           ? DROP_PACKET : 1;
+       if (ATM_SKB(skb)->vcc->send(ATM_SKB(skb)->vcc, skb)) {
+               atomic_sub(skb->truesize, &ATM_SKB(skb)->vcc->sk->sk_wmem_alloc);
+               kfree_skb(skb);
+               return DROP_PACKET;
+       }
+       return 1;
         * We don't have space to send this SKB now, but we might have
Comment 3 lejeczek 2009-06-06 07:15:25 EDT
oops, missed it and in the mean while sent CPU(fast one 7850be) back to the supplier,
but if situation, this same or similar repeats in the future, I'll test this patch.
Comment 4 Bug Zapper 2009-11-18 05:03:32 EST
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Comment 5 Bug Zapper 2009-12-18 04:29:42 EST
Fedora 10 changed to end-of-life (EOL) status on 2009-12-17. Fedora 10 is 
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