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Fix null pointer in arc_kmem_reap_now on 32-bit

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On 32 bit system, zio_buf_cache is limit to 1M. Larger than that is all NULL.
So we need to avoid reaping them.

Signed-off-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Issue #3973
This commit is contained in:
tuxoko 2015-10-30 14:34:22 -07:00 committed by Brian Behlendorf
parent d287880afd
commit d0c614ecf9
1 changed files with 5 additions and 0 deletions
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module/zfs/arc.c
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@ -3373,6 +3373,11 @@ arc_kmem_reap_now(void)
}
for (i = 0; i < SPA_MAXBLOCKSIZE >> SPA_MINBLOCKSHIFT; i++) {
#ifdef _ILP32
/* reach upper limit of cache size on 32-bit */
if (zio_buf_cache[i] == NULL)
break;
#endif
if (zio_buf_cache[i] != prev_cache) {
prev_cache = zio_buf_cache[i];
kmem_cache_reap_now(zio_buf_cache[i]);