ZFS data error without reasons

Hi,
Will any changes cause zfs data error?I find my disk data error without 
any reasons(shutdown or reboot  normally).disk was bought 
yesterday.sometimes it can be fixed with a zpool scrub.but mostly zpool 
scrub will return more errors.Even i restore all zpool from my 
backup,without 5 mins,zpool status shows data error and many checksum 
errors.

Now i build kernel with following patch 1 hour ago . I get a kernel 
panic when zfs send snapshot from usb device to hard disk.

--- //depot/user/jhb/lock/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c
+++ /Users/jhb/work/p4/lock/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c

_at__at_ -940,6 +940,7 _at__at_
        /* NB: we already did dmu_tx_wait() if necessary */
        goto top;
    }
+    VOP_UNLOCK(*xvpp, 0);

    return (error);
 }


db>bt
Tracing pid 12 tid 100036 td 0xffffff0004083000
pmp_pvh_free() at pmp_pvh_free+0xa
pmp_remove_entry() at pmp_remove_entry+0x1b
pmp_enter() at pmp_enter+0x593
vm_fault() at vm_fault+0x1470
trap() at trap + 0x1dc
calltrap() at calltrap+0x8
--- trap 0xc, rip =0xffffffff80531e56, rsp = 0xfffffffee6346ab0, rbp = 
0xfffffffee6346af0 ---
bcopy() at bcopy+0x16
ata_dmaunload() at ata_dmaunload+0x53
ata_ahci_end_transaction() at ata_ahci_end_transaction+0x9d
ata_interrupt() at ata_interrupt+0xc4
ata_generic_intr() at ata_generic_intr+0x2f
intr_event_execute_handlers() at intr_event_execute_handlers+0xfc
ithread_loop() at ithread_loop+0x8e
fork_exit() at fork_exit+0x118
fork_trampoline() at fork_trampoline+0xe
--- trap 0, rip = 0, rsp = 0xfffffffee6346d30,rbp = 0 ---

Thanks,
kevin