Hello @all,
currently, I'm testing lxc 4.0.5 with multiple Linux distro's,
and on some of them lxc-create(1) segfaulted.
When I run lxc-create(1) in GDB, I get:
Program received signal SIGSEGV, Segmentation fault.
x0i0007ffff7b6be79 in do_lxcapi_create (c=c@entry=0x6980b0,
t=t@entry=0x7fffffffe874 "vserver", bdevtype=bdevtype@entry=0x0,
specs=specs@entry=0x7fffffffe4b0, flags=flags@entry=0,
argv=argv@entry=0x7fffffffe640) at lxccontainer.c:1923
1923 bool reset_managed = c->lxc_conf->rootfs.managed;
This is near the end of do_lxcapi_create(). A few lines before,
the config is reset:
/* Reload config to get the rootfs. */
lxc_conf_free(c->lxc_conf);
c->lxc_conf = NULL;
The segfault happens when recreating the configuration fails afterwards,
e. g. when prepend_lxc_header() returns failure.
The reason for prepend_lxc_header() failing was a missing call to
OpenSSL_add_all_digests();
just before
md = EVP_get_digestbyname("sha1");
in src/lxc/utils.c; openssl versions older than 1.1.0 need this.
My question now is: What's the correct fix for the segfault?
container_destroy() needs a valid configation in c->lxc_conf.
Maybe we have to preserve the old c->lxc_conf until the new
configuration was created?
Best regards,
Robert
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