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[Qemu-devel] [PATCH] migration: fix the compression code
From: |
Fei Li |
Subject: |
[Qemu-devel] [PATCH] migration: fix the compression code |
Date: |
Tue, 25 Sep 2018 17:14:40 +0800 |
Add judgement in compress_threads_save_cleanup() to check whether the
static CompressParam *comp_param has been allocated. If not, just
return; or else segmentation fault will occur when using the NULL
comp_param's parameters. One test case can reproduce this is: set
the compression on and migrate to a wrong nonexistent host IP address.
Our current code does not judge before handling comp_param[idx]'s quit
and cond that whether they have been initialized. If not initialized,
"qemu_mutex_lock_impl: Assertion `mutex->initialized' failed." will
occur. Fix this by squashing the terminate_compression_threads() into
compress_threads_save_cleanup() and employing the existing judgement
condition. One test case can reproduce this error is: set the
compression on and fail to fully setup the default eight compression
thread in compress_threads_save_setup().
Signed-off-by: Fei Li <address@hidden>
---
migration/ram.c | 24 ++++++++----------------
1 file changed, 8 insertions(+), 16 deletions(-)
diff --git a/migration/ram.c b/migration/ram.c
index f6fd8e5e09..050d535068 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -420,28 +420,14 @@ static void *do_data_compress(void *opaque)
return NULL;
}
-static inline void terminate_compression_threads(void)
-{
- int idx, thread_count;
-
- thread_count = migrate_compress_threads();
-
- for (idx = 0; idx < thread_count; idx++) {
- qemu_mutex_lock(&comp_param[idx].mutex);
- comp_param[idx].quit = true;
- qemu_cond_signal(&comp_param[idx].cond);
- qemu_mutex_unlock(&comp_param[idx].mutex);
- }
-}
-
static void compress_threads_save_cleanup(void)
{
int i, thread_count;
- if (!migrate_use_compression()) {
+ if (!migrate_use_compression() || !comp_param) {
return;
}
- terminate_compression_threads();
+
thread_count = migrate_compress_threads();
for (i = 0; i < thread_count; i++) {
/*
@@ -451,6 +437,12 @@ static void compress_threads_save_cleanup(void)
if (!comp_param[i].file) {
break;
}
+
+ qemu_mutex_lock(&comp_param[i].mutex);
+ comp_param[i].quit = true;
+ qemu_cond_signal(&comp_param[i].cond);
+ qemu_mutex_unlock(&comp_param[i].mutex);
+
qemu_thread_join(compress_threads + i);
qemu_mutex_destroy(&comp_param[i].mutex);
qemu_cond_destroy(&comp_param[i].cond);
--
2.13.7
- [Qemu-devel] [PATCH] migration: fix the compression code,
Fei Li <=