Bug 449311

Created attachment 307329 [details]
smolt info + /var/log/messages sample.

/vr/log/dmesg gets written once after bootup and never again after that. You
probably want something like:

  watch 'dmesg | tail -22'

And it looks like the sysrq commands were accepted but the loglevel is wrong.
Try adding "ignore_loglevel" to the kernel boot options.

Added 'ignore_loglevel' to /etc/sysctl.conf, but not sure that I got it working
correctly; saw no additional dmesg's and watch hung (stopped updating the
timestamp in the top right hand corner). Tried it twice, as follows:

1. "kernel.ignore_loglevel"
2. "kernel.ignore_loglevel = 1"

Additional observation is the larger the rdesktop geometry the easier it is to
recreate.

Just add ignore_loglevel to the end of the kernel option list in grub.conf, like
this:

title Fedora (2.6.25.4-10.fc8)
        root (hd0,0)
        kernel /vmlinuz-2.6.25.4-10.fc8 ro root=LABEL=/ ignore_loglevel
        initrd /initrd-2.6.25.4-10.fc8.img

Added the "ignore_loglevel" option. Obviously affective - many more messages
during boot. Repeated test. Here's the "watch" output (no new messages appeared
when system hung):


Every 1.0s: dmesg | tail -16                            Sat Jun 14 19:59:23 2008

Bluetooth: RFCOMM ver 1.8
Bluetooth: BNEP (Ethernet Emulation) ver 1.2
Bluetooth: BNEP filters: protocol multicast
Bridge firewalling registered
pan0: Dropping NETIF_F_UFO since no NETIF_F_HW_CSUM feature.
eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
agpgart: Found an AGP 3.0 compliant device at 0000:00:00.0.
agpgart: Putting AGP V3 device at 0000:00:00.0 into 8x mode
agpgart: Putting AGP V3 device at 0000:01:00.0 into 8x mode
[drm] Setting GART location based on new memory map
[drm] Loading R300 Microcode
[drm] writeback test succeeded in 1 usecs
ALSA sound/usb/usbaudio.c:1353: setting usb interface 2:2
eth0: no IPv6 routers present
ALSA sound/usb/usbaudio.c:1353: setting usb interface 2:2
SELinux: initialized (dev fuse, type fuse), uses genfs_contexts

Caused hang. Then from my laptop ssh'd to the hung FC9 machine and ran top.
Process Xorg running at greater than 99% cpu.
"https://bugs.freedesktop.org/show_bug.cgi?id=3168" seems to describe the same
bug including under Fedora 8, see comment #27. Do I continue to pursue this
under Fedora or X?

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