I got the same problems too. Here is the log. Please email me if you have solution. Thank you.
Sun Oct 7 02:57:52 2012
panic(cpu 2 caller 0xffffff80282b7bd5): Kernel trap at 0xffffff80282460b4, type 13=general protection, registers:
CR0: 0x000000008001003b, CR2: 0x00000001085ad000, CR3: 0x000000007410904d, CR4: 0x00000000000606e0
RAX: 0xdeadbeefdeadbeef, RBX: 0xffffff7fa9dc3148, RCX: 0xffffff8035ae2f50, RDX: 0x0000000000000000
RSP: 0xffffff802f87a940, RBP: 0xffffff802f87a940, RSI: 0xffffff7fa9dc3360, RDI: 0xffffff8033936000
R8: 0xffffff8039d5d550, R9: 0x0000000000000000, R10: 0xffffff8035ae2f50, R11: 0x0000000000000000
R12: 0x0000000000000001, R13: 0xffffff8039d5d550, R14: 0xffffff8039d5d550, R15: 0xffffff8035ae2f50
RFL: 0x0000000000010282, RIP: 0xffffff80282460b4, CS: 0x0000000000000008, SS: 0x0000000000000010
Fault CR2: 0x00000001085ad000, Error code: 0x0000000000000000, Fault CPU: 0x2
Backtrace (CPU 2), Frame : Return Address
0xffffff802f87a5e0 : 0xffffff802821d626
0xffffff802f87a650 : 0xffffff80282b7bd5
0xffffff802f87a820 : 0xffffff80282ce4ed
0xffffff802f87a840 : 0xffffff80282460b4
0xffffff802f87a940 : 0xffffff802830f9e6
0xffffff802f87a950 : 0xffffff7fa9dc2021
0xffffff802f87a9b0 : 0xffffff7fa9dc147b
0xffffff802f87ba30 : 0xffffff8028540db1
0xffffff802f87ba90 : 0xffffff80282f56a6
0xffffff802f87bae0 : 0xffffff8028309351
0xffffff802f87bb90 : 0xffffff80282fbb49
0xffffff802f87bc40 : 0xffffff80282fc314
0xffffff802f87bf50 : 0xffffff80285e182a
0xffffff802f87bfb0 : 0xffffff80282ced33
Kernel Extensions in backtrace:
com.avast.AvastFileShield(1.0.1)[A0A1FD97-2C58-7950-37D9-0CD538FAD375]@0xffffff7fa9dc0000->0xffffff7fa9dc5fff
BSD process name corresponding to current thread: helpd
Mac OS version:
12C60
Kernel version:
Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64
Kernel UUID: 69A5853F-375A-3EF4-9247-478FD0247333
Kernel slide: 0x0000000028000000
Kernel text base: 0xffffff8028200000
System model name: MacBookAir4,2 (Mac-742912EFDBEE19B3)
System uptime in nanoseconds: 13924265683192
last loaded kext at 12495768449641: com.apple.driver.AppleUSBCDC 4.1.22 (addr 0xffffff7fa9e2c000, size 16384)
last unloaded kext at 12579659490162: com.apple.driver.AppleUSBCDC 4.1.22 (addr 0xffffff7fa9e2c000, size 12288)