linux-kernel - Re: linux-next: runtime warning in next-20220125

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Date:   Tue, 25 Jan 2022 10:36:07 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Chuck Lever <chuck.lever@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        Trond Myklebust <trondmy@...il.com>,
        NFS Mailing List <linux-nfs@...r.kernel.org>
Subject: Re: linux-next: runtime warning in next-20220125

On Tue, 25 Jan 2022 10:01:38 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Tue, 25 Jan 2022 16:21:46 +1100
> Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> 
> > Hi all,
> > 
> > On Tue, 25 Jan 2022 16:05:05 +1100 Stephen Rothwell <sfr@...b.auug.org.au> wrote:  
> > >
> > > My qemu boot test of a powerpc pseries_le_defconfig kernel produces the
> > > following trace:
> > > 
> > > ------------[ cut here ]------------
> > > WARNING: CPU: 0 PID: 0 at kernel/trace/trace_events.c:417 trace_event_raw_init+0x194/0x730
> > > Modules linked in:
> > > CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.17.0-rc1 #2
> > > NIP:  c0000000002bdbb4 LR: c0000000002bdcb0 CTR: c0000000002bdb70
> > > 
> > > I have no idea what has caused this :-(  Maybe commit
> > > 
> > >   5544d5318802 ("SUNRPC: Same as SVC_RQST_ENDPOINT, but without the xid")    
> > 
> > Actually, reverting commits
> > 
> >   6ff851d98af8 ("SUNRPC: Improve sockaddr handling in the svc_xprt_create_error trace point")
> >   5544d5318802 ("SUNRPC: Same as SVC_RQST_ENDPOINT, but without the xid")
> >   e2d3613db12a ("SUNRPC: Record endpoint information in trace log")
> > 
> > makes the warning go away.
> >   
> 
> We added a new way to save items on the ring buffer, but did not update the
> safety checks to know about them. I'll fix this shortly.
> 

This should fix it:

I'll make it a real patch and start running it through my tests.

-- Steve


diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 3147614c1812..f527ae807e77 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -384,6 +384,12 @@ static void test_event_printk(struct trace_event_call *call)
 			if (!(dereference_flags & (1ULL << arg)))
 				goto next_arg;
 
+			/* Check for __get_sockaddr */;
+			if (str_has_prefix(fmt + i, "__get_sockaddr(")) {
+				dereference_flags &= ~(1ULL << arg);
+				goto next_arg;
+			}
+
 			/* Find the REC-> in the argument */
 			c = strchr(fmt + i, ',');
 			r = strstr(fmt + i, "REC->");