Re: Kernel panic from malloc() on SUSE 15.1?

[Michael Ellerman <mpe@ellerman.id.au>]

Carl Jacobsen <cjacobsen@storix.com> writes:
> I've got a SUSE 15.1 install (on ppc64le) that kernel panics on a very
> simple
> test program, built in a slightly unusual way.
>
> I'm compiling on SUSE 12, using gcc 4.8.3. I'm linking to a static
> copy of libcrypto.a (from openssl-1.1.1g), built without threads.
> I have a 10 line C test program that compiles and runs fine on the
> SUSE 12 system. If I compile the same program on SUSE 15.1 (with
> gcc 7.4.1), it runs fine on SUSE 15.1.
>
> But, if I run the version that I compiled on SUSE 12, on the SUSE 15.1
> system, the call to RAND_status() gets to a malloc() and then panics.
> (And, of course, if I just compile a call to malloc(), that runs fine
> on both systems.) Here's the test program, it's really just a call to
> RAND_status():
>
>     #include <stdio.h>
>     #include <openssl/rand.h>
>
>     int main(int argc, char **argv)
>     {
>         int has_enough_data = RAND_status();
>         printf("The PRNG %s been seeded with enough data\n",
>                has_enough_data ? "HAS" : "has NOT");
>         return 0;
>     }
>
> openssl is configured/built with:
>     ./config no-shared no-dso no-threads -fPIC -ggdb3 -debug -static
>     make
>
> and the test program is compiled with:
>     gcc -ggdb3 -o rand_test rand_test.c libcrypto.a
>
> The kernel on SUSE 12 is: 3.12.28-4-default
> And glibc is: 2.19
>
> The kernel on SUSE 15.1 is: 4.12.14-197.18-default
> And glibc is: 2.26
>
> In a previous iteration it was panicking in pthread_once(), so
> I compiled openssl without pthreads support, and now it panics
> calling malloc().

What's the panic look like?

cheers