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Thu, 5 Oct 2023 09:56:17 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=natalenko.name; s=dkim-20170712; t=1696492577; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=qLErRg+IY+M+tMiWfSLlVJCQY74BdF5SCkyderIHIa0=; b=h7xrC5PkklBLzvH13lJaXipMzYLk7ODNLFPeypzjuPHUyCP+2NbcQ+lR7VinR5D68csHYC ER5lSQNMZ1BujtcDRgS1EEmaOkSp5YuOTsVmySu1ONKkk1UjK2aNxkLw21T5v35ccRaPjP ET8Ej0R8oBGTFKEcgEr9SS7Use/bjM4= From: Oleksandr Natalenko To: Matthew Wilcox , Thomas Zimmermann Cc: Linux Regressions , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Christian =?ISO-8859-1?Q?K=F6nig?= , linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org, Maxime Ripard , Bagas Sanjaya , Andrew Morton , Sumit Semwal , linux-media@vger.kernel.org Subject: Re: [REGRESSION] BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250 Date: Thu, 05 Oct 2023 09:56:03 +0200 Message-ID: <3254850.aeNJFYEL58@natalenko.name> In-Reply-To: References: <13360591.uLZWGnKmhe@natalenko.name> <2160215.irdbgypaU6@natalenko.name> MIME-Version: 1.0 Content-Type: multipart/signed; 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charset="UTF-8"; protected-headers="v1" From: Oleksandr Natalenko Date: Thu, 05 Oct 2023 09:56:03 +0200 Message-ID: <3254850.aeNJFYEL58@natalenko.name> In-Reply-To: MIME-Version: 1.0 Hello. On =C4=8Dtvrtek 5. =C5=99=C3=ADjna 2023 9:44:42 CEST Thomas Zimmermann wrot= e: > Hi >=20 > Am 02.10.23 um 17:38 schrieb Oleksandr Natalenko: > > On pond=C4=9Bl=C3=AD 2. =C5=99=C3=ADjna 2023 16:32:45 CEST Matthew Wilc= ox wrote: > >> On Mon, Oct 02, 2023 at 01:02:52PM +0200, Oleksandr Natalenko wrote: > >>>>>>> BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250 > >>>>>>> > >>>>>>> Corrupted memory at 0x00000000e173a294 [ ! ! ! ! ! ! ! ! ! ! ! ! = ! ! ! ! ] (in kfence-#108): > >>>>>>> drm_gem_put_pages+0x186/0x250 > >>>>>>> drm_gem_shmem_put_pages_locked+0x43/0xc0 > >>>>>>> drm_gem_shmem_object_vunmap+0x83/0xe0 > >>>>>>> drm_gem_vunmap_unlocked+0x46/0xb0 > >>>>>>> drm_fbdev_generic_helper_fb_dirty+0x1dc/0x310 > >>>>>>> drm_fb_helper_damage_work+0x96/0x170 > >>> > >>> Matthew, before I start dancing around, do you think ^^ could have th= e same cause as 0b62af28f249b9c4036a05acfb053058dc02e2e2 which got fixed by= 863a8eb3f27098b42772f668e3977ff4cae10b04? > >> > >> Yes, entirely plausible. I think you have two useful points to look at > >> before delving into a full bisect -- 863a8e and the parent of 0b62af. > >> If either of them work, I think you have no more work to do. > >=20 > > OK, I've did this against v6.5.5: > >=20 > > ``` > > git log --oneline HEAD~3.. > > 7c1e7695ca9b8 (HEAD -> test) Revert "mm: remove struct pagevec" > > 8f2ad53b6eac6 Revert "mm: remove check_move_unevictable_pages()" > > fa1e3c0b5453c Revert "drm: convert drm_gem_put_pages() to use a folio_b= atch" > > ``` > >=20 > > then rebooted the host multiple times, and the issue is not seen any mo= re. > >=20 > > So I guess 3291e09a463870610b8227f32b16b19a587edf33 is the culprit. >=20 > Ignore my other email. It's apparently been fixed already. Thanks! Has it? I think I was able to identify offending commit, but I'm not aware = of any fix to that. Thanks. > Best regards > Thomas >=20 > >=20 > > Thanks. > >=20 >=20 > --=20 > Thomas Zimmermann > Graphics Driver Developer > SUSE Software Solutions Germany GmbH > Frankenstrasse 146, 90461 Nuernberg, Germany > GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman > HRB 36809 (AG Nuernberg) >=20 =2D-=20 Oleksandr Natalenko (post-factum) --nextPart3261088.44csPzL39Z Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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