------- Comment From [email protected] 2016-02-22 12:46 EDT-------
Hi William
Purgatory code checks for the sanity of the code before proceeding [with
verify_sha256_digest() call]
This call is failing when compiled with gcc verison 5.3.1-8ubuntu2 (available
in Ubuntu 16.04) while
it works just fine when compiled with gcc version 4.9.2-10ubuntu12 available in
ubuntu 15.04.
Couple of observations that may be relevant:
1. The below warning is observed when compiled with gcc version
5.3.1-8ubuntu2
purgatory/arch/ppc64/console-ppc64.c: In function 'putchar':
purgatory/arch/ppc64/console-ppc64.c:42:2: warning: '*((void *)&buff+8)' may be
used uninitialized in this function [-Wmaybe-uninitialized]
plpar_hcall_norets(H_PUT_TERM_CHAR, 0, 1,
2. In the failing environment "printf("I'm in purgatory\n")" also yields no
output on console for pseries.
This usually would succeed if the call plpar_hcall_norets() (hypervisor call)
goes through.
Also, things work fine with 5.3.1-8ubuntu2 compiler if -O0 is used instead of
-Os.
Attaching the preprocessed code for purgatory and also the compile options.
Please let me know,
if I need to add more material.
Thanks
Hari
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https://bugs.launchpad.net/bugs/1546260
Title:
kexec/kdump not working in ubuntu 16.04
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