I'm pretty sure this bug is actually in libnss-extrausers (see top of
stack trace).
libvirtd is trying a getgrouplist, which is calling out to the various
NSS modules through glibc.
In libnss-extrausers, this construct in group.c:
static FILE *groupsfile = NULL;
[...]
enum nss_status _nss_extrausers_endgrent(void) {
if (groupsfile != NULL) {
fclose(groupsfile);
groupsfile = NULL;
}
return NSS_STATUS_SUCCESS;
}
is obviously not in any way thread safe, even though the module
advertises itself as reentrant.
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https://bugs.launchpad.net/bugs/1602264
Title:
libvirtd crashes with double free or corruption (out)
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