Hi Nan Xiao,
Yes, it is unmount. Please see the man page below. I tried to run unmount and
dtrace both under root, same issue.
MOUNT(2) BSD System Calls Manual MOUNT(2)
NAME
mount, unmount -- mount or dismount a filesystem
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
int
mount(const char *type, const char *dir, int flags, void *data);
int
unmount(const char *dir, int flags);
- Steve
------------------ ???????? ------------------
??????: "Nan Xiao";<n...@chinadtrace.org>;
????????: 2016??1??25??(??????) ????1:14
??????: "STEVE"<195128...@qq.com>;
"dtrace-discuss"<dtrace-discuss@lists.dtrace.org>;
????: Re: [dtrace-discuss] syscall::unmount: doesn't work in OS X 10.11.2
Hi Steve,
The syscall is unmount, not umount?
Best Regards
Nan Xiao (????)
Skype: xiaonan19830818
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From: STEVE
Date: 2016-01-25 12:17
To: dtrace-discuss
Subject: [dtrace-discuss] syscall::unmount: doesn't work in OS X 10.11.2
Hi,
I recently had an issue that SMB share volume hosted on a NetApp cluser cannot
be ejected. lsof shows nothing regarding this volume. I also did a packet trace
when reproducing this issue. However, there is no tree-disconnect (SMB command
to disconnect the share) in the trace. I suspect that something local that was
preventing the un-mount operation. I have an idea to trace the unmount(2)
system call see where the operation was blocked by looking at the stack trace
with the following dtrace one-liner:
bash-3.2# dtrace -n 'syscall::unmount:return {@[ustack(),pid,execname]=count()}'
dtrace: description 'syscall::unmount:return ' matched 1 probe
dtrace: error on enabled probe ID 1 (ID 469: syscall::unmount:return): invalid
user access in action #2
^C
bash-3.2#
As you can see, the one-liner doesn't work. I don't understand the error
message. How can I proceed for this issue?
Appreciate for any inputs!
Thank you!
Steve Zhou
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