I want to check value of the in-out parameter of one function when it
returns, but each time dtrace will report error.
Following is the script, anyone can help me correct the error with it?
#!/usr/sbin/dtrace -s
#pragma D option quiet
#pragma D option bufsize=4m
fbt::kstrgetmsg:entry
/pid==$target/
{
self->arg1=arg1;
}
fbt::kstrgetmsg:return
/pid==$target&&self->arg1/
{
printf("mp=%x\n",*(uint64_t *)copyin(self->arg1,8));
self->arg1=0;
}
intel6# ./kstrgetmsg.d -c "rcp intel2-1:/test1000k ."
rcp: dropped connection
dtrace: error on enabled probe ID 2 (ID 17047:
fbt:genunix:kstrgetmsg:return): invalid address (0xffffff001edd9b90) in
action #1 at DIF offset 52
dtrace: error on enabled probe ID 2 (ID 17047:
fbt:genunix:kstrgetmsg:return): invalid address (0xffffff001edd9b90) in
action #1 at DIF offset 52
dtrace: error on enabled probe ID 2 (ID 17047:
fbt:genunix:kstrgetmsg:return): invalid address (0xffffff001edd9b90) in
action #1 at DIF offset 52
.......
Thanks
Zhihui
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