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Fix: Adjust CACHE_BIN_NFLUSH_BATCH_MAX size to prevent assert failures

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The maximum allowed value for `nflush_batch` is
`CACHE_BIN_NFLUSH_BATCH_MAX`. However, `tcache_bin_flush_impl_small`
could potentially declare an array of `emap_batch_lookup_result_t`
of size `CACHE_BIN_NFLUSH_BATCH_MAX + 1`. leads to a `VARIABLE_ARRAY`
assertion failure, observed when `tcache_nslots_small_max` is
configured to 2048. This patch ensures the array size does not exceed
the allowed maximum.

Signed-off-by: Xin Yang <yangxin.dev@bytedance.com>
This commit is contained in:
Xin Yang 2025-05-13 11:01:36 +08:00 • committed by Qi Wang
parent f19a569216
commit 9169e9272a
1 changed files with 1 additions and 1 deletions
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2
include/jemalloc/internal/cache_bin.h
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@ -616,7 +616,7 @@ struct cache_bin_fill_ctl_s {
* This is to avoid stack overflow when we do batch edata look up, which
* reserves a nflush * sizeof(emap_batch_lookup_result_t) stack variable.
*/
#define CACHE_BIN_NFLUSH_BATCH_MAX (VARIABLE_ARRAY_SIZE_MAX >> LG_SIZEOF_PTR)
#define CACHE_BIN_NFLUSH_BATCH_MAX ((VARIABLE_ARRAY_SIZE_MAX >> LG_SIZEOF_PTR) - 1)
/*
* Filling and flushing are done in batch, on arrays of void *s. For filling,