What steps will reproduce the problem? 1. Use the System :) 2. Use the System 3. Follow Step 1.

What is the expected output? What do you see instead? Interval Since Last Panic Report: 684944 sec Panics Since Last Report: 12 Anonymous UUID: C7D328A3-6A2D-469D-BFD7-E0DBAFBB7A8E

Wed Aug 11 17:36:06 2010 panic(cpu 0 caller 0xffffff7f817a61b5): "ZFS: I/O failure (read on <unknown> off 0: zio 0xffffff8017b1f008 [L0 SPA space map] 1000L/200P DVA[0]=<0:4189d10600:200> DVA[1]=<0:24e456600:200> DVA[2]=<0:528187bc00:200> fletcher4 lzjb LE contiguous birth=782364 fill=1 cksum=193f686b44:96a80b03edd:1d15bf1849190:3dfe456e6d8f8f): error " "5"@/Users/ksh/devel/maczfs_72/usr/src/uts/common/fs/zfs/zio.c:918 Backtrace (CPU 0), Frame : Return Address 0xffffff8091f6bda0 : 0xffffff8000204b99 0xffffff8091f6bea0 : 0xffffff7f817a61b5 0xffffff8091f6bf00 : 0xffffff7f817a9c85 0xffffff8091f6bfa0 : 0xffffff80002c6367 Kernel Extensions in backtrace (with dependencies): com.apple.filesystems.zfs(72.1.10)@0xffffff7f8175d000->0xffffff7f817c5fff

BSD process name corresponding to current thread: kernel_task

Mac OS version: 10F569

Kernel version: Darwin Kernel Version 10.4.0: Fri Apr 23 18:27:12 PDT 2010; root:xnu-1504.7.4~1/RELEASE_X86_64 System model name: MacBookPro5,2 (Mac-F2268EC8)

Unable to reproduce.