Re: [BUG] general protection fault, probably for non-canonical address 0x280766500040001: 0000 [#1] PREEMPT SMP PTI

[Su Yue <l@damenly.org>]

On Tue 16 Jan 2024 at 12:33, Kent Overstreet 
<kent.overstreet@linux.dev> wrote:

> On Tue, Jan 16, 2024 at 12:24:48PM -0500, Brian Foster wrote:
>> On Tue, Jan 16, 2024 at 12:03:09PM -0500, Kent Overstreet 
>> wrote:
>> > On Tue, Jan 16, 2024 at 10:33:08AM -0500, Brian Foster wrote:
>> > > Hi Kent,
>> > >
>> > > JFYI, I'm seeing the following splat pretty reliably via 
>> > > generic/361 on
>> > > an 80xcpu test box. The CI doesn't seem to produce this 
>> > > failure for
>> > > whatever reason. This bisects down to commit 023f9ac9f70f 
>> > > ("bcachefs:
>> > > Delete dio read alignment check"), before which the test 
>> > > still fails but
>> > > the kernel doesn't explode.
>> > >
>> > > Brian
>> > >
>> >
>> > Can you test the following?
>> >
>>
>> Still blows up... repeated a couple times to be sure.
>
> That sounds like a driver bug then - what driver?


I think it's not a drive bug. It's related to bcachefs block_size.
I can reproduce it by running generic/361 with block_size 4096.

The test devices are normal qemu disks backing by files in host.
The bug disappears after hanging mkfs block_size to 512.

--
Su