From: Eric Wheeler <bcache@lists.ewheeler.net>
To: Coly Li <colyli@suse.de>
Cc: linux-bcache@vger.kernel.org, Mingzhe Zou <mingzhe.zou@easystack.cn>
Subject: bcache: bch_extent_bad() stale dirty pointer
Date: Thu, 11 Apr 2024 19:42:59 -0700 (PDT) [thread overview]
Message-ID: <dd6d4e1-dcd9-81e2-4be1-1999dae5a90@ewheeler.net> (raw)
Hi Coly and Mingzhe,
Have you ever seen this dmesg notice before? It only printed two lines
into dmesg:
[Apr11 19:28] bcache: bch_extent_bad() stale dirty pointer, stale 1, key: 0:15956311168 len 24 -> [0:32419560 gen 88] dirty
[ +0.014297] bcache: bch_extent_bad() stale dirty pointer, stale 1, key: 0:15956311168 len 24 -> [0:32419560 gen 88] dirty
This doesn't look like its a major concern, after all just this is a
pr_info, and the "stale" value of "1" is well below BUCKET_GC_GEN_MAX (96)
so I'm not at risk of hitting btree_bug_on().
Is this something that should be addressed?
Near extents.c:537:
static bool bch_extent_bad(struct btree_keys *bk, const struct bkey *k)
{
struct btree *b = container_of(bk, struct btree, keys);
unsigned int i, stale;
char buf[80];
if (!KEY_PTRS(k) ||
bch_extent_invalid(bk, k))
return true;
for (i = 0; i < KEY_PTRS(k); i++)
if (!ptr_available(b->c, k, i))
return true;
for (i = 0; i < KEY_PTRS(k); i++) {
stale = ptr_stale(b->c, k, i);
if (stale && KEY_DIRTY(k)) {
bch_extent_to_text(buf, sizeof(buf), k);
pr_info("stale dirty pointer, stale %u, key: %s\n", <<<<<<<
stale, buf);
}
btree_bug_on(stale > BUCKET_GC_GEN_MAX, b,
"key too stale: %i, need_gc %u",
stale, b->c->need_gc);
if (stale)
return true;
if (expensive_debug_checks(b->c) &&
bch_extent_bad_expensive(b, k, i))
return true;
}
return false;
}
--
Eric Wheeler
reply other threads:[~2024-04-12 2:43 UTC|newest]
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