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From: "lilingfeng (A)" <lilingfeng3@huawei.com>
To: <linux-kernel@vger.kernel.org>, Joe Thornber <ejt@redhat.com>
Cc: <snitzer@redhat.com>, <yi.zhang@huawei.com>,
	<yangerkun@huawei.com>, <chengzhihao1@huawei.com>,
	<zhangxiaoxu5@huawei.com>
Subject: Question about how to trigger BUG_ON() in sm_disk_new_block()
Date: Fri, 13 Jan 2023 16:07:31 +0800	[thread overview]
Message-ID: <3475f910-68fd-76da-c7f9-4fcc32d878e7@huawei.com> (raw)

Hello,

I notice the patch 4feaef830de7ffdd8352e1fe14ad3bf13c9688f8 (dm space 
map common: fix to ensure new block isn't already in use) can explain 
the BUG_ON() in sm_disk_new_block().
However, I'm still confused since I can't find the code path in which 
'begin' field was not being updated (as you say "increment of a data 
block reference count due to breaking sharing of a neighbour block in 
the same btree leaf").

What I found are as below:
break_sharing
  alloc_data_block
   dm_pool_alloc_data_block
    dm_sm_new_block
     sm_disk_new_block
      sm_ll_find_free_block
      smd->begin = *b + 1

May I bother you to list the path?

Thanks


                 reply	other threads:[~2023-01-13  8:09 UTC|newest]

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