Re: [Qemu-devel] [PULL 9/9] colo-proxy: fix memory leak

[Greg Kurz <groug@kaod.org>]

On Mon, 31 Oct 2016 16:05:00 +0800
Zhang Chen <zhangchen.fnst@cn.fujitsu.com> wrote:

> On 10/31/2016 03:40 PM, Jason Wang wrote:
> >
> >
> > On 2016年10月31日 14:37, Zhang Chen wrote:  
> >>
> >>
> >> On 10/30/2016 08:13 PM, Greg Kurz wrote:  
> >>> On Wed, 26 Oct 2016 10:24:11 +0800
> >>> Jason Wang <jasowang@redhat.com> wrote:
> >>>  
> >>>> From: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
> >>>>
> >>>> Fix memory leak in colo-compare.c and filter-rewriter.c
> >>>> Report by Coverity and add some comments.
> >>>>
> >>>> Signed-off-by: Zhang Chen <zhangchen.fnst@cn.fujitsu.com>
> >>>> Reviewed-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
> >>>> Signed-off-by: Jason Wang <jasowang@redhat.com>
> >>>> ---  
> >>> Hi,
> >>>
> >>> This commit breaks --enable-trace-backends=ust builds in travis (#17):
> >>>
> >>> In file included from ./trace/generated-tracers.h:5966:0,
> >>>                   from /home/travis/build/gkurz/qemu/include/trace.h:4,
> >>>                   from qapi/qapi-visit-core.c:22:
> >>> ./trace/generated-ust-provider.h:18625:3: error: unknown type name 
> >>> ‘_TP_EXPROTOint’
> >>> In file included from 
> >>> /home/travis/build/gkurz/qemu/include/trace.h:4:0,
> >>>                   from qapi/qapi-visit-core.c:22:
> >>> ./trace/generated-tracers.h: In function ‘trace_colo_compare_pkt_info’:
> >>> ./trace/generated-tracers.h:19249:432: error: expected string 
> >>> literal before ‘_SDT_ASM_OPERANDS_ssize’
> >>> ./trace/generated-tracers.h:19249:432: error: implicit declaration 
> >>> of function ‘__tracepoint_cb_qemu___colo_compare_pkt_info’ 
> >>> [-Werror=implicit-function-declaration]
> >>> ./trace/generated-tracers.h:19249:432: error: nested extern 
> >>> declaration of ‘__tracepoint_cb_qemu___colo_compare_pkt_info’ 
> >>> [-Werror=nested-externs]
> >>> cc1: all warnings being treated as errors
> >>> make: *** [qapi/qapi-visit-core.o] Error 1
> >>> make: *** Waiting for unfinished jobs....
> >>>
> >>> https://travis-ci.org/gkurz/qemu/jobs/171641119  
> >>
> >> I got your point and test it, same problem in here.
> >> I found that when trace args >10 it not work(this trace have 11 args),
> >> else it works well like that:
> >>
> >> colo_compare_pkt_info(const char *src, const char *dst, uint32_t 
> >> pseq, uint32_t pack, uint32_t sseq, uint32_t sack, int res, uint32_t 
> >> pflag, uint32_t sflag, const char *src1) "src/dst: %s/%s p: 
> >> seq/ack=%u/%u   s: seq/ack=%u/%u res=%d flags=%x/%x %s\n"
> >>
> >> So I think this bug could be related to trace system, but I review 
> >> trace codes nothing be found about this.
> >> CC: stefan
> >>
> >> Thanks   
> >
> > We met similar issue in the past which looks like a limitation of the 
> > backend.
> >
> > Btw, Alex Bennee has posted a workaround for this, could you please 
> > review or ack on that patch?  
> 
> Can you give me a patch name ? and about this patch, should I send a 
> patch split this trace_event
> to two trace_event first ?
> 

This is what Alex's patch does :)

net: split colo_compare_pkt_info into two trace events

<20161028132559.8324-1-alex.bennee@linaro.org>

> Thanks
> Zhang Chen
> 

Cheers.

--
Greg