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BUG/MEDIUM: random: align the state on 2*64 bits for ARM64

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x86_64 and ARM64 do support the double-word atomic CAS. However on
ARM it must be done only on aligned data. The random generator makes
use of such double-word atomic CAS when available but didn't enforce
alignment, which causes ARM64 to crash early in the startup since
commit 52bf839 ("BUG/MEDIUM: random: implement a thread-safe and
process-safe PRNG").

This commit just unconditionally aligns the arrays. It must be
backported to all branches where the commit above is backported
(likely till 2.0).
This commit is contained in:
Willy Tarreau 2020-03-12 00:31:18 +01:00
parent 84fd8a77b7
commit 1544c14c57
1 changed files with 3 additions and 3 deletions
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6
src/standard.c
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@ -4530,7 +4530,7 @@ int varint_bytes(uint64_t v)
/* Random number generator state, see below */
static uint64_t ha_random_state[2];
static uint64_t ha_random_state[2] ALIGNED(2*sizeof(uint64_t));
/* This is a thread-safe implementation of xoroshiro128** described below:
* http://prng.di.unimi.it/
@ -4542,8 +4542,8 @@ static uint64_t ha_random_state[2];
uint64_t ha_random64()
{
uint64_t result;
uint64_t old[2];
uint64_t new[2];
uint64_t old[2] ALIGNED(2*sizeof(uint64_t));
uint64_t new[2] ALIGNED(2*sizeof(uint64_t));
#if defined(USE_THREAD) && (!defined(HA_CAS_IS_8B) || !defined(HA_HAVE_CAS_DW))
static HA_SPINLOCK_T rand_lock;