In the past week I've had this same error message twice, while using
Firefox.
The first time, Firefox froze, then gnome-panel crashed, then Compiz
crashed. I killed X with Control-Alt-Delete. The virtual terminals
printed information which looks like the same sort of thing ("call
trace", libraries and what look like memory addresses) as in the
original bug report. Finally, I had a kernel panic message... sorry I
can't remember it precisely, but it was something like "Kernel Panic:
Sync failed - tried to kill init!".
The same problem happened again with me just now. Firefox froze. I
force-quit it straight away, but the Compiz animation froze half-way
through. X froze as well, but I was able to force an emergency sync
before I rebooted. The only error message printed to the kernel log was
"Feb 16 22:01:24 chris-desktop kernel: [15332.295773] Eeek!
page_mapcount(page) went negative! (-1)". That is also the only error
printed to the syslog. I have just found the messages from the first
time it happened 2 days ago; these are attached.
I know that the first time I was running Firefox and Pidgin. The second
time I know I was running Firefox and Kdenlive, which had been killing
the X server earlier. I might have been running Kdenlive the first time
as well, and I might've been running Pidgin the second time.
The major oddity of my system is that I don't have any swap, but it has
been running fine for 1.5 months since I built it. It passed Memtest86 a
month ago. The only hardware or software change I have made recently is
that I set up Gnome so that when I press the power button on my tower,
it shuts down (rather than the default action of "ask").
Running Ubuntu Gutsy, with kernel 2.6.22-14.46 generic on 32-bit x86
with SMP in use.
** Attachment added: "dmesg and lspci"
http://launchpadlibrarian.net/12036721/launchpad_bug_pagecount_firsttime
--
page_mapcount(page) went negative
https://bugs.launchpad.net/bugs/123223
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