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imf04.hostedemail.com; dkim=none; spf=pass (imf04.hostedemail.com: domain of benh@kernel.crashing.org designates 63.228.1.57 as permitted sender) smtp.mailfrom=benh@kernel.crashing.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1770765798; a=rsa-sha256; cv=none; b=634lFjyuwfiAnrIbMoLc7HiecPuYMXawKA/B/wQoHdGrirv5fbARrgl74Ifa8kj4sKmeHI 6nIvz+1UaJFXKsHkpu6vlf/NJrASaongYsfwH4Vmy/8IZXgX/t843P7z5ehzoyO6xgqhjC nWFOWBwg7YzerDDm8MMjjUBAOLhFTEA= Received: from [IPv6:::1] (localhost [127.0.0.1]) by gate.crashing.org (8.18.1/8.18.1/Debian-2) with ESMTP id 61ANN6xi006521; Tue, 10 Feb 2026 17:23:07 -0600 Message-ID: <684d84272e7dcd2ead0770843a7e0afc625c87c9.camel@kernel.crashing.org> Subject: Re: [PATCH] mm: Fix memblock_free_late() when using deferred struct page From: Benjamin Herrenschmidt To: Mike Rapoport Cc: linux-mm@kvack.org, Alexander Potapenko , Marco Elver , Dmitry Vyukov Date: Wed, 11 Feb 2026 10:23:06 +1100 In-Reply-To: References: <279931074239b7f3812c4cb3969f887303c8cc26.camel@kernel.crashing.org> <5a44609fe992624573a3ca0a293888bd623e2a06.camel@kernel.crashing.org> <0344bfbeb017cafc0f7bd4433eeacd9bc802d9c9.camel@kernel.crashing.org> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.3-0ubuntu1.1 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 2A00140010 X-Rspamd-Server: rspam07 X-Stat-Signature: t5pw6p1n8w1m4cgft7ckrgpnu1mgmnka X-HE-Tag: 1770765796-500610 X-HE-Meta: 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 Ujm7kU62 heoX2B3Hb9qKznAEGjCQ5F4xBkegYqF9Nltemup1U/WWJ2BA8sg/3YtgKguZAMiiLP71LCWrqjrWtFdqG1SUTl5D+VrcyLlQoI+BV2+fS2Zcbg9oiU0c+om4iYw== 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 Tue, 2026-02-10 at 16:32 +0200, Mike Rapoport wrote: > Hi Ben, >=20 > On Tue, Feb 10, 2026 at 07:34:15PM +1100, Benjamin Herrenschmidt wrote: > > On Tue, 2026-02-10 at 17:17 +1100, Benjamin Herrenschmidt wrote: > > >=20 > > > So ... that was a backport to 6.12.68 and my original patch is > > > crashing > > > the same way ! (it was working last week interestingly enough, > > > something else got backported that gets in the way maybe ?). > > >=20 > > > I'm going to have to go back to digging :-( > > >=20 > > > I suspect the pages aren't reserved. I swear this was working :-) > >=20 > > So I rebuilt with a bit of extra debug prints, CONFIG_DEBUG_VM on, and > > memblock=3Ddebug ... it's not hitting the reserved check, but it's also > > not crashing the same way (still 6.12, I'll play with upstream again > > later): > >=20 > > =C2=A0 .../... >=20 > Do you mind sending the entire log? I misplaced it, but give me a few days to dig see if I can find what's goin= g on. Cheers Ben.