Re: PdcLockWatchdog Dump - How and Why?
Your crashes do not look overly serious. One appears to be a result of Acronis, which happens every now and then in my experience, especially since your system had been on without restarting for 5 days (corruption may be a factor with long uptimes). The other occurred too far back to really be worth investigating.
Since these crashes are infrequent, I wouldn't worry too much about them. They are probably due to system sleep/wake cycles and the system doing something unexpected power-wise due to a driver or due to minor corruption in memory/hard disk storage. I experience similar on my own systems every few weeks if I do not restart my systems regularly (I believe some of my crashes occur due to a driver that hasn't been updated by the manufacturer in a while for a device I use). If you are really concerned, you could check your Dell support site for driver updates to your chipset and/or storage controllers.