From: "Longpeng (Mike, Cloud Infrastructure Service Product Dept.)" <longpeng2@huawei.com>
To: <marcandre.lureau@redhat.com>, <pbonzini@redhat.com>,
<armbru@redhat.com>
Cc: chenjiashang@huawei.com,
"Gonglei \(Arei\)" <arei.gonglei@huawei.com>,
qemu-devel@nongnu.org
Subject: A bug of Monitor Chardev ?
Date: Mon, 17 May 2021 14:56:39 +0800 [thread overview]
Message-ID: <cd197959-7da0-ee50-1e65-e6b2e7107a86@huawei.com> (raw)
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!
next reply other threads:[~2021-05-17 7:11 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-17 6:56 Longpeng (Mike, Cloud Infrastructure Service Product Dept.) [this message]
2021-05-19 16:17 ` A bug of Monitor Chardev ? 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
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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