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From: Markus Armbruster <armbru@redhat.com>
To: "Longpeng (Mike,
	Cloud Infrastructure Service Product Dept.)"
	<longpeng2@huawei.com>
Cc: chenjiashang@huawei.com,
	"Daniel P. Berrangé" <berrange@redhat.com>,
	qemu-devel@nongnu.org, "Peter Xu" <peterx@redhat.com>,
	"Gonglei (Arei)" <arei.gonglei@huawei.com>,
	pbonzini@redhat.com, marcandre.lureau@redhat.com
Subject: Re: A bug of Monitor Chardev ?
Date: Tue, 08 Jun 2021 16:07:30 +0200	[thread overview]
Message-ID: <87o8cgxxel.fsf@dusky.pond.sub.org> (raw)
In-Reply-To: <cd197959-7da0-ee50-1e65-e6b2e7107a86@huawei.com> (Longpeng's message of "Mon, 17 May 2021 14:56:39 +0800")

"Longpeng (Mike, Cloud Infrastructure Service Product Dept.)"
<longpeng2@huawei.com> writes:

> We find a race during QEMU starting, which would case the QEMU process coredump.
>
> <main loop>                             |    <MON iothread>
>                                         |
> [1] create MON chardev                  |
> qemu_create_early_backends              |
>   chardev_init_func                     |
>                                         |
> [2] create MON iothread                 |
> qemu_create_late_backends               |
>   mon_init_func                         |
> 	aio_bh_schedule-----------------------> monitor_qmp_setup_handlers_bh
> [3] enter main loog                     |    tcp_chr_update_read_handler
> (* A client come in, e.g. Libvirt *)    |      update_ioc_handlers
> tcp_chr_new_client                      |
>   update_ioc_handlers                   |
>                                         |
>     [4] create new hup_source           |
>         s->hup_source = *PTR1*          |
>           g_source_attach(s->hup_source)|
>                                         |        [5] remove_hup_source(*PTR1*)
>                                         |            (create new hup_source)
>                                         |             s->hup_source = *PTR2*
>         [6] g_source_attach_unlocked    |
>               *PTR1* is freed by [5]    |
> 			
> Do you have any suggestion to fix this bug ? Thanks!

Do we?  We talked, but I'm not sure we reached a conclusion.



  parent reply	other threads:[~2021-06-08 14:08 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17  6:56 A bug of Monitor Chardev ? Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-05-19 16:17 ` Marc-André Lureau
2021-05-19 16:40   ` Daniel P. Berrangé
2021-05-21  7:25     ` Markus Armbruster
2021-05-21 14:43       ` Peter Xu
2021-05-21 16:33         ` Daniel P. Berrangé
2021-05-21 16:56           ` Daniel P. Berrangé
2021-05-21 16:59             ` Marc-André Lureau
2021-05-21 17:07               ` Daniel P. Berrangé
2021-05-21 17:14               ` Peter Xu
2021-05-25  6:53               ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-05-21 17:09             ` Peter Xu
2021-05-21 17:15               ` Daniel P. Berrangé
2021-06-08 14:07 ` Markus Armbruster [this message]
2021-06-08 15:37   ` Daniel P. Berrangé
2021-06-09  0:20     ` Longpeng (Mike, Cloud Infrastructure Service Product Dept.)
2021-06-09 10:13       ` Marc-André Lureau

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