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From 2c14a6831954a59256cc8d1980da0ad705a3a3fa Mon Sep 17 00:00:00 2001
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From: Juan Quintela <quintela@redhat.com>
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Date: Tue, 3 Mar 2020 14:51:37 +0000
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Subject: [PATCH 05/18] migration/multifd: fix destroyed mutex access in
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terminating multifd threads
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RH-Author: Juan Quintela <quintela@redhat.com>
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Message-id: <20200303145143.149290-5-quintela@redhat.com>
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Patchwork-id: 94119
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O-Subject: [RHEL-AV-8.2.0 qemu-kvm PATCH v2 04/10] migration/multifd: fix destroyed mutex access in terminating multifd threads
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Bugzilla: 1738451
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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RH-Acked-by: Peter Xu <peterx@redhat.com>
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RH-Acked-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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From: Jiahui Cen <cenjiahui@huawei.com>
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One multifd will lock all the other multifds' IOChannel mutex to inform them
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to quit by setting p->quit or shutting down p->c. In this senario, if some
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multifds had already been terminated and multifd_load_cleanup/multifd_save_cleanup
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had destroyed their mutex, it could cause destroyed mutex access when trying
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lock their mutex.
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Here is the coredump stack:
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#0 0x00007f81a2794437 in raise () from /usr/lib64/libc.so.6
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#1 0x00007f81a2795b28 in abort () from /usr/lib64/libc.so.6
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#2 0x00007f81a278d1b6 in __assert_fail_base () from /usr/lib64/libc.so.6
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#3 0x00007f81a278d262 in __assert_fail () from /usr/lib64/libc.so.6
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#4 0x000055eb1bfadbd3 in qemu_mutex_lock_impl (mutex=0x55eb1e2d1988, file=<optimized out>, line=<optimized out>) at util/qemu-thread-posix.c:64
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#5 0x000055eb1bb4564a in multifd_send_terminate_threads (err=<optimized out>) at migration/ram.c:1015
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#6 0x000055eb1bb4bb7f in multifd_send_thread (opaque=0x55eb1e2d19f8) at migration/ram.c:1171
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#7 0x000055eb1bfad628 in qemu_thread_start (args=0x55eb1e170450) at util/qemu-thread-posix.c:502
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#8 0x00007f81a2b36df5 in start_thread () from /usr/lib64/libpthread.so.0
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#9 0x00007f81a286048d in clone () from /usr/lib64/libc.so.6
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To fix it up, let's destroy the mutex after all the other multifd threads had
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been terminated.
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Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
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Signed-off-by: Ying Fang <fangying1@huawei.com>
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Reviewed-by: Juan Quintela <quintela@redhat.com>
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Signed-off-by: Juan Quintela <quintela@redhat.com>
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(cherry picked from commit 9560a48ecc0c20d87bc458a6db77fba651605819)
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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migration/ram.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/migration/ram.c b/migration/ram.c
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index 860f781..6c55c5d 100644
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--- a/migration/ram.c
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+++ b/migration/ram.c
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@@ -1052,6 +1052,10 @@ void multifd_save_cleanup(void)
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if (p->running) {
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qemu_thread_join(&p->thread);
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}
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+ }
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+ for (i = 0; i < migrate_multifd_channels(); i++) {
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+ MultiFDSendParams *p = &multifd_send_state->params[i];
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+
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socket_send_channel_destroy(p->c);
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p->c = NULL;
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qemu_mutex_destroy(&p->mutex);
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@@ -1335,6 +1339,10 @@ int multifd_load_cleanup(Error **errp)
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qemu_sem_post(&p->sem_sync);
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qemu_thread_join(&p->thread);
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}
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+ }
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+ for (i = 0; i < migrate_multifd_channels(); i++) {
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+ MultiFDRecvParams *p = &multifd_recv_state->params[i];
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+
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object_unref(OBJECT(p->c));
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p->c = NULL;
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qemu_mutex_destroy(&p->mutex);
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--
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1.8.3.1
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