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Commit95936c7

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Fix memory leak on DSM slot exhaustion.
If we attempt to create a DSM segment when no slots are available,we should return the memory to the operating system. Previouslywe did that if the DSM_CREATE_NULL_IF_MAXSEGMENTS flag waspassed in, but we didn't do it if an error was raised. Repair.Back-patch to 9.4, where DSM segments arrived.Author: Thomas MunroReviewed-by: Robert HaasReported-by: Julian BackesDiscussion:https://postgr.es/m/CA%2BhUKGKAAoEw-R4om0d2YM4eqT1eGEi6%3DQot-3ceDR-SLiWVDw%40mail.gmail.com
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  • src/backend/storage/ipc

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‎src/backend/storage/ipc/dsm.c

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Original file line numberDiff line numberDiff line change
@@ -496,9 +496,18 @@ dsm_create(Size size)
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/* Verify that we can support an additional mapping. */
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if (nitems >=dsm_control->maxitems)
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{
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LWLockRelease(DynamicSharedMemoryControlLock);
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dsm_impl_op(DSM_OP_DESTROY,seg->handle,0,&seg->impl_private,
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&seg->mapped_address,&seg->mapped_size,WARNING);
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if (seg->resowner!=NULL)
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ResourceOwnerForgetDSM(seg->resowner,seg);
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dlist_delete(&seg->node);
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pfree(seg);
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ereport(ERROR,
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(errcode(ERRCODE_INSUFFICIENT_RESOURCES),
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errmsg("too many dynamic shared memory segments")));
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}
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/* Enter the handle into a new array slot. */
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dsm_control->item[nitems].handle=seg->handle;

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