| Re: [PATCH] remove BUG() in possible but rare condition [message #45897 is a reply to message #45895] |
Wed, 11 April 2012 19:02   |
Glauber Costa
Messages: 916
Registered: October 2011
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Senior Member |
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On 04/11/2012 03:57 PM, Linus Torvalds wrote:
> On Wed, Apr 11, 2012 at 11:48 AM, Michal Hocko<mhocko@suse.cz> wrote:
>>
>> I am not familiar with the code much but a trivial call chain walk up to
>> write_dev_supers (in btrfs) shows that we do not check for the return value
>> from __getblk so we would nullptr and there might be more.
>> I guess these need some treat before the BUG might be removed, right?
>
> Well, realistically, isn't BUG() as bad as a NULL pointer dereference?
>
> Do you care about the exact message on the screen when your machine dies?
Not particular, but I don't see why (I might be wrong) it would
necessarily lead to a NULL pointer dereference.
At least in my test cases, after turning this to a WARN (to make sure it
was still being hit), the machine could go on just fine.
I was running this in a container system, with restricted memory. After
killing the container - at least in my ext4 system - everything seemed
as happy as ever.
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