[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] trace: disallow more than 10 arguments per trac
From: |
Eric Blake |
Subject: |
Re: [Qemu-devel] [PATCH] trace: disallow more than 10 arguments per trace event |
Date: |
Wed, 26 Apr 2017 12:54:12 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0 |
On 04/26/2017 10:39 AM, Daniel P. Berrange wrote:
> The UST trace backend can only cope with upto 10 arguments. To ensure we
s/upto/up to/
> don't exceed the limit when UST is not compiled in, disallow more than
> 10 arguments upfront.
>
> This prevents the case where:
>
> commit 0fc8aec7de64f2bf83a274a2a38b938ce03425d2
>
> regressed the fix done in
>
> commit 2dfe5113b11ce0ddb08176ebb54ab7ac4104b413
>
> Now we get an immediate fail even when UST is disabled:
>
> GEN net/trace.h
> Traceback (most recent call last):
> File "/home/berrange/src/virt/qemu/scripts/tracetool.py", line 154, in
> <module>
> main(sys.argv)
> File "/home/berrange/src/virt/qemu/scripts/tracetool.py", line 145, in main
> events.extend(tracetool.read_events(fh))
> File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line
> 307, in read_events
> event = Event.build(line)
> File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line
> 244, in build
> event = Event(name, props, fmt, args)
> File "/home/berrange/src/virt/qemu/scripts/tracetool/__init__.py", line
> 196, in __init__
> "argument count" % name)
> ValueError: Event 'colo_compare_tcp_info' has more than maximum permitted
> argument count
> Makefile:96: recipe for target 'net/trace.h-timestamp' failed
Not necessarily the nicest-looking error, but sufficient to prevent the
regression.
Reviewed-by: Eric Blake <address@hidden>
>
> Signed-off-by: Daniel P. Berrange <address@hidden>
> ---
>
> Obviously dont apply this until 0fc8aec7de64f2bf83a274a2a38b938ce03425d2 has
> been reverted :-)
It now has: commit 51b9d495.
--
Eric Blake, Principal Software Engineer
Red Hat, Inc. +1-919-301-3266
Virtualization: qemu.org | libvirt.org
signature.asc
Description: OpenPGP digital signature