[Bug 12769] error allocating core memory buffers (code 22) depending on source file system

[samba-bugs at samba.org]

https://bugzilla.samba.org/show_bug.cgi?id=12769

--- Comment #6 from Dave Gordon <dg32768 at zoho.eu> ---
The hash table doubles each time it reaches 75% full. A hash table for 32m
items @ 16 bytes each (8 byte key, 8 byte void *data) needs 512MB of memory. At
the next doubling (up to 64m items) it hits the array allocator limit in
utils2.c:

#define MALLOC_MAX 0x40000000

void *_new_array(unsigned long num, unsigned int size, int use_calloc)
{
        if (num >= MALLOC_MAX/size)
                return NULL;
        return use_calloc ? calloc(num, size) : malloc(num * size);
}
void *_realloc_array(void *ptr, unsigned int size, size_t num)
{
        if (num >= MALLOC_MAX/size)
                return NULL;
        if (!ptr)
                return malloc(size * num);
        return realloc(ptr, size * num);
}

No single array allocation or reallocation is allowed to exceed MALLOC_MAX
(1GB). Hence rsync can only handle up to 32m items per invocation if a hash
table is required (e.g. for tracking hardlinks when -H is specified).

HTH,
Dave

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