Re: [git pull] vfs part 2

From	Al Viro <viro@ZenIV.linux.org.uk>
Newsgroups	linux.kernel
Subject	Re: [git pull] vfs part 2
Date	2015-07-01 11:00 +0200
Message-ID	<pHm27-2Wc-19@gated-at.bofh.it> (permalink)
References	(3 earlier) <pE8I2-3dm-33@gated-at.bofh.it> <pHjGV-1xX-3@gated-at.bofh.it> <pHl62-2i0-1@gated-at.bofh.it> <pHlz5-2HQ-37@gated-at.bofh.it> <pHlSq-2Rg-15@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, Jul 01, 2015 at 11:41:04AM +0300, Andrey Ryabinin wrote:
> On 07/01/2015 11:27 AM, Al Viro wrote:
> > 
> > Could you check if 3.19 was getting anything similar?   I.e. in
> > p9_client_write() there add
> > 	if (count > rsize)
> > 		printk(KERN_ERR "bogus RWRITE: %d -> %d\n", rsize, count);
> > just before
> > 	p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
> > and see if that triggers...
> > 
> 
> Yeah, the same thing:
> 	[  125.962374] bogus RWRITE: 27 -> 4096
> 	[  207.587632] bogus RWRITE: 27 -> 4096
> 	[  215.055627] bogus RWRITE: 27 -> 4096
> 	[  235.583138] bogus RWRITE: 27 -> 4096
> 	[  245.749174] bogus RWRITE: 27 -> 4096
> 	[  246.759270] bogus RWRITE: 27 -> 4096
> 	[  248.020787] bogus RWRITE: 27 -> 4096

Hrm...  Could you add (int)req->rc->id, (int)req->rc->tag and (int)req->tc->tag
to that printk (on either kernel, the problem's apparently not new)?

The question is whether we are mismatching replies, sending bogus requests or
if it's really the server sending bogus replies.  Which qemu version are
you using, BTW?
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Thread

Re: [git pull] vfs part 2 Andrey Ryabinin <a.ryabinin@samsung.com> - 2015-07-01 10:00 +0200
  Re: [git pull] vfs part 2 Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-01 10:30 +0200
    Re: [git pull] vfs part 2 Andrey Ryabinin <a.ryabinin@samsung.com> - 2015-07-01 10:50 +0200
      Re: [git pull] vfs part 2 Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-01 11:00 +0200
        Re: running out of tags in 9P (was Re: [git pull] vfs part 2) Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-02 10:30 +0200
          Re: running out of tags in 9P (was Re: [git pull] vfs part 2) Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-02 10:50 +0200
            Re: running out of tags in 9P (was Re: [git pull] vfs part 2) Andrey Ryabinin <a.ryabinin@samsung.com> - 2015-07-02 14:30 +0200
              Re: running out of tags in 9P (was Re: [git pull] vfs part 2) Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-03 11:50 +0200
                [PATCH] forgetting to cancel request in interrupted zero-copy 9P RPC  (was Re: [git pull] vfs part 2) Al Viro <viro@ZenIV.linux.org.uk> - 2015-07-03 17:10 +0200

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