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owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7 Jan 2026, at 20:53, Kefeng Wang wrote: > On 2026/1/8 9:05, Kefeng Wang wrote: >> >> >> On 2026/1/8 3:38, Zi Yan wrote: >>> On 7 Jan 2026, at 13:39, Mark Brown wrote: >>> >>>> On Wed, Jan 07, 2026 at 07:31:30PM +0200, Claudiu Beznea wrote: >>>>> On 12/30/25 09:24, Kefeng Wang wrote: >>>> >>>>>> Introduce alloc_contig_frozen_pages() and cma_alloc_frozen_compound(= ) >>>>>> which avoid atomic operation about page refcount, and then convert t= o >>>>>> allocate frozen gigantic folio by the new helpers in hugetlb to clea= nup >>>>>> the alloc_gigantic_folio(). >>>>> >>>>> I'm seeing the following issues on the Renesas RZ/G3S SoC when doing = suspend >>>>> to idle: >>>>> >>>>> [=C2=A0 129.636729] Unable to handle kernel paging request at virtual= address >>>>> dead000000000108 >>>>> [=C2=A0 129.644674] Mem abort info: >>>>> [=C2=A0 129.647456]=C2=A0=C2=A0 ESR =3D 0x0000000096000044 >>>> >>>> This is also introducing OOMs when doing at least audio tests (I don't >>>> think these are super relevant) on Raspberry Pi 3B+ running NFS root >>>> (probably more relevant): >>>> >>>> [=C2=A0=C2=A0 64.064256] Unable to handle kernel paging request at vir= tual address fffffdffc1000000 >>>> >>>> ... >>>> >>>> [=C2=A0=C2=A0 64.087583] Call trace: >>>> [=C2=A0=C2=A0 64.087586]=C2=A0 kmem_cache_free+0x88/0x434 (P) >>>> [=C2=A0=C2=A0 64.087598]=C2=A0 skb_free_head+0x9c/0xb8 >>>> [=C2=A0=C2=A0 64.087608]=C2=A0 skb_release_data+0x120/0x174 >>>> [=C2=A0=C2=A0 64.087615]=C2=A0 __kfree_skb+0x2c/0x44 >>>> [=C2=A0=C2=A0 64.087622]=C2=A0 tcp_data_queue+0x948/0xe50 >>>> >>>> Full log: >>>> >>>> =C2=A0=C2=A0 https://lava.sirena.org.uk/scheduler/job/2341856#L1721 >>>> >>>> Bisection identifies: >>>> >>>> [fb9a328d30400dbc8b2ea5a57daeb28bedac398b] mm: cma: add cma_alloc_froz= en{_compound}() >>>> >>>> as being the comit that introduces the issue.=C2=A0 Bisect log with li= nks to >>>> further test runs: >>> >>> Hi Mark and Claudiu, >> >> Thanks for the reports. >> >>> >>> Can you try the patch below to see if it fixes the issue? Basically, >>> in cma_release(), count was used to drop page ref and decreased to 0, >>> but after the loop, count becomes -1 and __cma_release_frozen() >>> is releasing unnecessary pages. >> >> Oh=EF=BC=8Csorry for introducing the regression, my previous self-tests = were >> more focused on the hugetlb part, I should be more careful about this, >> and thanks Zi Yan for the quick fix, I will do more check and test for >> the non-hugetlb part. >> >> > > Based on the cma_debug interface, I performed quick tests to reproduce > the issue before Zi's fix. With the fix applied, the crash was resolved, > and no other issues were observed during testing. It seems that the series is dropped from Andrew=E2=80=99s tree. You probabl= y want to send a new version with the fix folded. Best Regards, Yan, Zi