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X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 24 Feb 2026, at 12:07, David Hildenbrand wrote: >> David Hildenbrand (Arm) hat am 24.02.2026 12:00 CET g= eschrieben: >> >> >> >> >> >> 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 ca= ll 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_pa= ge(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(). Best Regards, Yan, Zi