Something weird happened to my linode after 18:40 (BST==UTC+1) and my machine shut down... I wasn't even at my PC, so it wasn't me!

Any ideas?

Here's the log snippet:

Jul 15 18:32:00 localhost kernel: IN-world:IN=eth0 OUT= MAC=fe:fd:40:05:35:93:00:05:
32:1d:a8:c2:08:00 SRC=152.14.29.154 DST=64.5.53.147 LEN=40 TOS=0x00 PREC=0x00 TTL=24
2 ID=5309 PROTO=TCP SPT=4541 DPT=4000 WINDOW=4096 RES=0x00 SYN URGP=0
Jul 15 18:40:01 localhost /USR/SBIN/CRON[989]: (www-data) CMD ([ -x /usr/lib/cgi-bin
/awstats.pl -a -f /etc/awstats/awstats.conf -a -r /var/log/apache/access.log ] && /u
sr/lib/cgi-bin/awstats.pl -config=awstats -update >/dev/null)
Jul 15 19:26:08 localhost syslogd 1.4.1#14: restart.

From your console log ("logsview" command via Lish):

Kernel panic: kernel BUG at include/linux/dcache.h:273!

Kernel panic: kernel BUG at include/linux/dcache.h:273!

 <6>SysRq : Show Regs

EIP: 0073:[<400c893b>] CPU: 0 Not tainted ESP: 007b:bfffdb94 EFLAGS: 00200202
    Not tainted
EAX: ffffffda EBX: bfffdc60 ECX: 00000000 EDX: 000001b6
ESI: 080e9808 EDI: 4018e550 EBP: bfffdbbc DS: 007b ES: 007b
Call Trace: [<80030c0b>] [<801e59e2>] [<8001e8fe>] [<800400d6>] [<800339a7>] 
   [<80033a2f>] [<8006d3bf>] [<8006d60d>] [<802e304b>] [<8001c164>] [<80023425>] 
   [<8006dfba>] [<8002353d>] [<8006e686>] [<80060f62>] [<8004fa87>] [<80061302>] 
   [<80022ebf>] [<80022563>] [<80022f2e>] [<80022157>] [<8002241c>] [<80022c58>] 
   [<802e2d58>] [<80022ba4>] [<802fb7cd>] 

I've seen this once before with a Linode running an older kernel, and I believe it is a bug in the Linux kernel itself, not relating to UML. I'll shoot an email out to uml-devel and see if anyone has any thoughts.

-Chris

I remember this now... It's a bug in 2.6.5. I'll try to roll up a 2.6.7-um kernel soon.

    270 static inline struct dentry *dget(struct dentry *dentry)
    271 {
    272         if (dentry) {
    273                 BUG_ON(!atomic_read(&dentry->d_count));
    274                 atomic_inc(&dentry->d_count);
    275         }
    276         return dentry;
    277 }

-Chris