From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8b3) Gecko/20050818 Fedora/1.1-0.2.7.deerpark.alpha2.1 Firefox/1.0+ Description of problem: Boot up would hang on my notebook as soon as I first tried kernel-2.6.12-1.1499_FC5, right after enabling swap partitions. Further investigation has revealed that it was the rc.sysinit command `dmesg -s 131072 > /var/log/dmesg' that stopped the boot from making progress. I forced an fsck of all filesystems on kernel-2.6.12-1.1492_FC5, that boots up just fine, to no avail. I booted up 1499_FC5 with init=/bin/bash, remounted / rw and ran dmesg > /tmp/dmesg (same filesystem), and that worked. dmesg > /var/log/dmesg, however, would still hang. true > /var/log/dmesg wouldn't, and would successfully zero out the file. Moving the existing /var/log/dmesg out of the way was no use either; dmesg > /var/log/dmesg would still hang. strace /bin/dmesg completed successfully; strace /bin/dmesg > /tmp/dmesg did as well; writes were line-buffered in the first case, and in 4KiB blocks in the second, as expected. strace /bin/dmesg > /var/log/dmesg would succeed in the first two 4KiB writes to stdout, but the third would never complete. After the first failure, the system came back up with /dev/md8 in need of resync. /dev/md8 is the raid 1 device holding the physical volume that contains (part of?) the logical volume containing the root filesystem. In all other cases /dev/md8 was resyncing, and this didn't seem to affect the results. I tried to make sure the problem was not related with sbp2 or usb-storage (I've got two external disks on which swap and raid devices are mounted), and either they're both broken, or the problem is unrelated with them. Version-Release number of selected component (if applicable): kernel-2.6.12-1.1499_FC5 How reproducible: Always Steps to Reproduce: 1.Boot up an AMD64 notebook onto 1.1499_FC5 2.After it hangs, reboot with init=/bin/bash 3.Remount / rw, then run dmesg > /var/log/dmesg Actual Results: It hangs Expected Results: 1.1492_FC5 doesn't, and that was good :-) Additional info:
1.1502_FC5 and 1.1504_FC5 work fine.