Created attachment 438913 [details]
Ping log from the crash event displaying the network latency problem and disconnect.
Description of problem:
We have a number of HS22 blades in an IBM BladeCenter H, which also has a Nortel layer 2/3 gigabit switch (IBM product code 32R1860), to which all the blades are connected via chassis internal links. All the blades are running CentOS 5.5, except for one which is running Fedora 12.
Several times now the Fedora 12 blade has locked up. It doesn't respond to network requests, the screen is blank when viewed via the Advanced Management Module (a separate HW component in the chassis for managing the blades, connected via a separate network connection). In about a minute or so the AMM will report that management network connectivity has been lost to the Fedora 12 blade. After this happens, network traffic to other blades in the same chassis will first show increased latency and then stop entirely. Network functionality is restored immediately when the Fedora 12 blade is powered off.
Version-Release number of selected component (if applicable):
This happens relatively infrequently, every few weeks. Today's crash occurred during moderate network activity (running yum update).
All that log shows is that something is wrong.
What kind of network adapter is in that machine? Is there anything in the system log when that happens?
Created attachment 439123 [details]
lspci -v output on the affected machine
Dual Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet (rev 20). lspci -v attached.
At least /var/log/messages shows just normal looking activity, and then the messages after reboot, any other files I should check?
Also, the problem is not related to broken hardware, since the crashes moved to a different machine after swapping the Fedora 12 RAID-1 system drives to it. Under CentOS 5.5 all the blades seem to work fine.
Can you try booting with the kernel option "pcie_aspm=off"? You could also try "pci=nomsi" in addition to that but it's doubtful that MSI is causing any problems.
Sorry, I didn't notice your comment before now. I thought Bugzilla would automatically send updates to the bug reporter, but apparently I need to add myself manually to the CC list.
The crash happened again this week with the same kernel. I'll try rebooting with that option and we'll see if it helps. It may take another month though before it crashes again.
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