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Fix wait_info data race for deletion + fix atomic_wait logic #2016

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Merged
wenyongh merged 15 commits into from
Mar 13, 2023
Merged

Fix wait_info data race for deletion + fix atomic_wait logic #2016

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c0f13de
Fix wait_info data race for deletion
g0djan Mar 8, 2023
8fdbc12
clang format
g0djan Mar 8, 2023
b30a14c
Wait_info->wait_list access always should be under its lock actually
g0djan Mar 8, 2023
962e46f
forgot to set initial count_acquisition to 1
g0djan Mar 8, 2023
327c1a3
Merge branch 'main' into godjan/fix-wait-info-data-race
g0djan Mar 10, 2023
2f69b0d
use wait_list->len, not counter
g0djan Mar 10, 2023
3e1a974
clang format
g0djan Mar 10, 2023
bc9fa8b
Fix wromg waiting on atomic when proc_exit was called before thread r…
g0djan Mar 11, 2023
388684d
clang-format
g0djan Mar 11, 2023
8bf4aab
remove timeouts to catch actual errors for atomic_wait with BLOCKING_…
g0djan Mar 11, 2023
1efcb64
clang-format-12
g0djan Mar 11, 2023
bcd639d
fix passed args for fast interpreter
g0djan Mar 11, 2023
6c21413
Address review comments
g0djan Mar 11, 2023
e81fa95
Added warning about using wait-info->wait_list
g0djan Mar 11, 2023
2970e7d
fix comments
g0djan Mar 11, 2023
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18 changes: 17 additions & 1 deletion core/iwasm/common/wasm_shared_memory.c
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ typedef struct AtomicWaitInfo {
korp_mutex wait_list_lock;
bh_list wait_list_head;
bh_list *wait_list;
int count_acquisition;
} AtomicWaitInfo;

typedef struct AtomicWaitNode {
Expand Down Expand Up @@ -307,6 +308,8 @@ acquire_wait_info(void *address, bool create)

if (address)
wait_info = (AtomicWaitInfo *)bh_hash_map_find(wait_map, address);
if (wait_info)
++wait_info->count_acquisition;
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if (!create) {
os_mutex_unlock(&wait_map_lock);
Expand Down Expand Up @@ -334,6 +337,7 @@ acquire_wait_info(void *address, bool create)
if (!bh_hash_map_insert(wait_map, address, (void *)wait_info)) {
goto fail3;
}
wait_info->count_acquisition = 1;
}

os_mutex_unlock(&wait_map_lock);
Expand Down Expand Up @@ -380,11 +384,23 @@ static bool
map_remove_wait_info(HashMap *wait_map_, AtomicWaitInfo *wait_info,
void *address)
{
os_mutex_lock(&wait_map_lock);
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--wait_info->count_acquisition;
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os_mutex_lock(&wait_info->wait_list_lock);
if (wait_info->wait_list->len > 0) {
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os_mutex_unlock(&wait_info->wait_list_lock);
os_mutex_unlock(&wait_map_lock);
return false;
}
os_mutex_unlock(&wait_info->wait_list_lock);
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if (wait_info->count_acquisition > 0) {
os_mutex_unlock(&wait_map_lock);
return false;
}

bh_hash_map_remove(wait_map_, address, NULL, NULL);
os_mutex_unlock(&wait_map_lock);
return true;
}

Expand Down Expand Up @@ -486,8 +502,8 @@ wasm_runtime_atomic_wait(WASMModuleInstanceCommon *module, void *address,
wasm_runtime_free(wait_node);

/* Release wait info if no wait nodes attached */
removed_from_map = map_remove_wait_info(wait_map, wait_info, address);
os_mutex_unlock(&wait_info->wait_list_lock);
removed_from_map = map_remove_wait_info(wait_map, wait_info, address);
if (removed_from_map)
destroy_wait_info(wait_info);
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os_mutex_unlock(&node->shared_mem_lock);
Expand Down