Re: mm: Regression with v7.0-rc1 on RISC-V

[David Hildenbrand (Arm)]

On 2/24/26 09:37, Ron Economos wrote:
> I'm getting a BUG dump during shutdown with Linux v7.0-rc1 on RISC-V.
> 
> [  OK  ] Reached target shutdown.target - System Shutdown.
> [  OK  ] Reached target final.target - Late Shutdown Services.
> [  OK  ] Finished systemd-reboot.service - System Reboot.
> [  OK  ] Reached target reboot.target - System Reboot.
> [  173.985249] BUG: Bad page state in process shutdown  pfn:f8850
> [  173.985311] page: refcount:1 mapcount:0 mapping:0000000000000000
> index:0x0 pfn:0xf8850
> [  173.985336] flags: 0xffff80000000000(node=0|zone=0|
> lastcpupid=0x1ffff) CMA
> [  173.985365] raw: 0ffff80000000000 ffffffc501e21448 ffffffc600f2ae88
> 0000000000000000
> [  173.985386] raw: 0000000000000000 0000000000000000 00000001ffffffff
> 0000000000000000
> [  173.985403] page dumped because: nonzero _refcount

So, we're freeing something from CMA in cma_release().

In cma_release() we iterate all pages to decrement their refcount

	VM_WARN_ON(!put_page_testzero(pfn_to_page(pfn)));

I would expect that this would fire already if there is still a page
referenced.
	
Are you running with CONFIG_DEBUG_VM=y ?


-- 
Cheers,

David