... continuation
>> This comes from the VIR_REALLOC_N_QUIET macro (which calls this function).
>> and its a more complex version of:
>>
>> tmp = realloc(*(void**)ptrptr, size * count);
>>
>> Judging by what happened to QEMU instance (no memory available) I wouldn't
>> be surprised
>> if this call has also failed and made libvirt to fail. Unfortunately:
>>
>> (gdb) info locals
>> tmp = <optimized out>
>>
>> Have been optimized (variables values were held in register and not on the
>> stack).
>> I can't see what where the values from this stack frame.
>>
>> libvirt code doesn't check for this realloc return:
>>
>> ignore_value(VIR_REALLOC_N_QUIET(buf, got + 1));
>>
>> which means that the logic works expecting realloc to work all the time.
>> There is a sanity test for OOM in virReallocN, but that is only enabled:
>> #if TEST_OOM
>> if (virAllocTestFail()) {
>> if TEST_OOM is declared.
>> From Makefile, this option is NOT the default (likely introduce latency in
>> memory allocation):
>>
>> --enable-test-oom memory allocation failure checking [default=no]
>>
>> And its not enabled in Ubuntu or Debian as well.
#6 0x00007f945340d2f3 in virReallocN
(ptrptr=ptrptr@entry=0x7ffe2f31c0a0, size=size@entry=1,
count=count@entry=2839, report=report@entry=false,
domcode=domcode@entry=0, filename=filename@entry=0x0, funcname=0x0,
linenr=0) at ../../../src/util/viralloc.c:245
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https://bugs.launchpad.net/bugs/1670659
Title:
Libvirt can crash on lack of memory when starting multiple instances
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