Red Hat Bugzilla – Bug 252301
kernel-xen 2.6.21-2925.15.fc8 regressions
Last modified: 2013-04-30 19:37:10 EDT
Description of problem: I've updated to 2.6.21-2925.15.fc8 from 2.6.21-2925.14.fc8 and some things get broken. - Xserver restarts sometimes - installation of RHEL4 fullvirt machine results in kernel faults (rhel4 guest kernel fail) Version-Release number of selected component (if applicable): 2.6.21-2925.15.fc8 How reproducible: always
Created attachment 161334 [details] common ops (from dmesg immediately after boot)
I will provide more debuginfo after next crashes
Hm, kernel now completely hangs. After reboot nothing interesting in log. Any hints how debug this?
(In reply to comment #3) > Hm, kernel now completely hangs. After reboot nothing interesting in log. Any > hints how debug this? Of course, during creating paravirt machine
(In reply to comment #1) > Created an attachment (id=161334) [edit] > common ops (from dmesg immediately after boot) > Do you have the remaining of the dmesg contents? Especially the ACPI and IRQ-related messages. Is the TG3 network interface working, even with the warnings? If you have the full contents of dmesg and 'xm dmesg' of both 2.6.21-2925.14.fc8 and 2.6.21-2925.15.fc8, they will be useful for checking what changed from one version to another.
A new kernel-xen was submitted including a fix on the kernel IRQ handling. This may help to solve some of the issues, especially the TG3 synchronize_irq() warning. Could you test kernel-xen-2.6-2.6.21-2931.fc8 (that is building right now and should go to Rawhide soon) and report if the problems remain?
Created attachment 172373 [details] errors during paravirt start I don't have direct access to that machine now so I will test next kernel and attach dmesg outputs during monday
(In reply to comment #7) > Created an attachment (id=172373) [edit] > errors during paravirt start Are those errors from the guest or from the dom0 kernel?
(In reply to comment #7) > Created an attachment (id=172373) [edit] > errors during paravirt start Do you have the output of 'xm dmesg' of when this error was generated? The hypervisor seem to have returned an error to the kernel, and probably additional info is on xen dmesg.
I did some play with kernels 2925.14.fc8 and 2931.fc8. Kernel always hangs when multiple domains are under load (for example multiple domains are started, yum update on multiple domains etc). About comment #7 : If I could remember correctly I started machine remotely (ssh + virsh) and remote machine (means dom0, not domU) has to be rebooted so I guess problem could be with dom0.
Created attachment 180541 [details] dmesg from 2925.14.fc8
Created attachment 180561 [details] 2925.14.fc8 xm dmesg
Created attachment 180581 [details] 2931.fc8 dmesg
Created attachment 180601 [details] 2931.fc8 xm dmesg
I've removed Regression keyword because it seems problems were also in older kernel
Created attachment 188501 [details] fresh ops from up2date paravirt fc7 guest
(In reply to comment #7) > Created an attachment (id=172373) [edit] > errors during paravirt start > The log contains: > kernel: EIP is at xen_l1_entry_update+0x95/0xa1 I just got a xen_l2_entry_update() Oops on my test machine, and it is related CONFIG_HIGHPTE, that is not really reliable under Xen, but it was enabled on Fedora. I have disabled CONFIG_HIGHPTE on Rawhide kernel-xen (kernel-xen-2.6-2.6.21-2937.fc8) and it will be disabled on the next F7 kernel-xen update (kernel-xen-2.6-2.6.20-2934.fc7 or higher). The oops from comment #16 is also a symptom of the same bug related HIGHPTE. Could you check if kernel-xen-2.6-2.6.21-2937.fc8 is more stable, for you? If the stability problems are solved, then we have only the tg3 synchronize_irq() problems.
I tried 2.6.21-2940.fc8 and it looks fine. Kernel has no problems under heavy load. Only tg3 issue will be seen in dmesg output but I have no problems related to this
Thanks. I will create a separated bug for the tg3 synchronize_irq() warning.
Bug #293451 created for the tg3 synchronize_irq() warning. I am closing this bug, as the stability problems caused by HIGHPTE are gone.
kernel-xen-2.6-2.6.20-2934.fc7 has been pushed to the Fedora 7 testing repository. If problems still persist, please make note of it in this bug report.
kernel-xen-2.6-2.6.20-2934.fc7 has been pushed to the Fedora 7 stable repository. If problems still persist, please make note of it in this bug report.
*** Bug 335961 has been marked as a duplicate of this bug. ***
*** Bug 254941 has been marked as a duplicate of this bug. ***