linux-kernel - Re: e1000e NVM corruption issue status

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Date:	Mon, 29 Sep 2008 18:20:50 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
cc:	LKML <linux-kernel@...r.kernel.org>, agospoda@...hat.com,
	"Ronciak, John" <john.ronciak@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Graham, David" <david.graham@...el.com>, kkiel@...e.de,
	Thomas Gleixner <tglx@...utronix.de>,
	chris.jones@...onical.com, arjan@...ux.jf.intel.com
Subject: Re: e1000e NVM corruption issue status

On Mon, 29 Sep 2008, Jiri Kosina wrote:

> > in case your mailer hoses something apply in this order:
> > # This series applies on GIT commit 011fcfcb75311c7368f13170b9e68adcf146a557
> > 01-e-mem.patch
> > 02-e_flash.patch
> > 03-e1000e-release-lock-in-reset.patch
> > 04-e1000e-dont-sleep.patch
> > 05-e1000e-no-deeplocks.patch
> > 06-e1000e-drop-stats-lock.patch
> > 07-subject-e1000e-debug-patch.patch
> > 08-e1000e-version.patch
> > 09-e1000e-allow-bad-checksum.patch
> > 10-e1000e-dump-eeprom-to-dmesg.txt
> When using this patchset (plus patch that adds check for address range in 
> pci_mmap_resource() by Jesse Barnes), the machine (that already has 
> corrupted (but not completely erased)) hangs after dumping eeprom 
> contents:
> 0000:00:19.0: 0000:00:19.0: The NVM Checksum Is Not Valid
> /*********************/
> Current EEPROM Checksum : 0x2259
> Calculated              : 0xa259
> Offset    Values
> ========  ======
> 00000000: 00 15 58 c6 4a ff 00 08 ff ff 30 00 ff ff ff ff
> 00000010: ff ff ff ff c7 10 b9 20 aa 17 49 10 86 80 00 00
> 00000020: 01 0d 00 00 00 00 05 16 20 50 00 38 00 00 8b 0d
> 00000030: 02 06 c1 01 03 08 00 00 00 00 00 00 00 00 00 00
> 00000040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00000060: 00 01 00 40 28 12 07 40 ff ff ff ff ff ff ff ff
> 00000070: ff ff ff ff ff ff ff ff ff ff ff ff ff ff 59 22
> /*********************/
> after this, alt-sysrq-p indicates that it's somehow running in the loops 
> around r1000_read_nvm_ich8lan and e1000_release_swflag_uch8lan. Below 
> there are several subsequent alt-sysrq-p outputs on this frozen system

And I believe that this is because of this code in 
09-e1000e-allow-bad-checksum.patch:

        for (i = 0;; i++) {
                if (e1000_validate_nvm_checksum(hw) >= 0) {
                        /* copy the MAC address out of the NVM */
                        if (e1000e_read_mac_addr(&adapter->hw))
                                e_err("NVM Read Error reading MAC address\n");
                        break;
                }
                if (i == 2) {
                        e_err("The NVM Checksum Is Not Valid\n");
                        e1000e_dump_eeprom(adapter);
                        /*
                         * set MAC address to all zeroes to invalidate and
                         * temporary disable this device for the user. This
                         * blocks regular traffic while still permitting
                         * ethtool ioctls from reaching the hardware as well as
                         * allowing the user to run the interface after
                         * manually setting a hw addr using
                         * `ip link set address`
                         */
                        memset(hw->mac.addr, 0, netdev->addr_len);
                }
        }

We are missing 'break;' after the memset, and that is where the hanging 
machine comes from (the loop keeps spinning forever), right? I will verify 
this right away.

-- 
Jiri Kosina
SUSE Labs
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