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owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 24 Feb 2026, at 12:14, Zi Yan wrote: > On 24 Feb 2026, at 12:07, David Hildenbrand wrote: > >>> David Hildenbrand (Arm) hat am 24.02.2026 12:00 CET = geschrieben: >>> >>> >>> >>> >>> >>> 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=3D0|zone=3D0| >>>> >>>> lastcpupid=3D0x1ffff) 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=3Dy ? >>> >>> >>> >>> >>> >>> -- >>> >>> Cheers, >>> >>> >>> >>> David >> >> Thinking again without my computer at hand =E2=80=A6 isn=E2=80=98t the c= all completely optimized out without CONFIG_DEBUG_VM? >> >> >> >> At least that=E2=80=99s what I remember. > > Right. Without CONFIG_DEBUG_VM=3Dy, VM_WARN_ON(!put_page_testzero(pfn_to_= page(pfn))) > and is_check_pages_enabled(), which leads to free_page_is_bad()=E2=80=99s > =E2=80=9Cpage dumped because: nonzero _refcount=E2=80=9D, are disabled. > > It seems to me that someone else bump the page refcount between > VM_WARN_ON(!put_page_testzero(pfn_to_page(pfn))) and free_page_is_bad(). > Merging Ron=E2=80=99s reply from another thread[1]: =E2=80=9CSomething strange is going on. I enabled CONFIG_DEBUG_VM by itself= and the issue went away. Let me try CONFIG_DEBUG_PAGE_REF.=E2=80=9D Looks like something is racy, since it is reproducible reliably. [1] https://lore.kernel.org/all/30dd1efc-9bd9-4664-999e-610d181600f9@w6rz.n= et/ Best Regards, Yan, Zi