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t=1696261142; 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=cOB88vPQiLyH370nTLoYIxokwI7a/8OLj2bT7Vxp3cw=; b=pWXunvHw7ykTJg5hBsOg9EX0UAyT7FxfqVQMTpPDUw0Ad3+mLwq+Vj11H1fg015DGMouCo HDMokGSEED/qVoVe/NscrAb22quvRHi7Y+jUpi2n0kKzJZt4v0y0NCA2RqDB8IODILxZlF JC4Gq82iC3zo/kynuS1cSb+zfeXbs2c= From: Oleksandr Natalenko To: Matthew Wilcox Cc: linux-kernel@vger.kernel.org, Bagas Sanjaya , linux-media@vger.kernel.org, linaro-mm-sig@lists.linaro.org, dri-devel@lists.freedesktop.org, Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Sumit Semwal , Christian =?ISO-8859-1?Q?K=F6nig?= , Linux Regressions , Andrew Morton , linux-mm@kvack.org Subject: Re: [REGRESSION] BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250 Date: Mon, 02 Oct 2023 17:38:48 +0200 Message-ID: <2160215.irdbgypaU6@natalenko.name> In-Reply-To: References: <13360591.uLZWGnKmhe@natalenko.name> <2300189.ElGaqSPkdT@natalenko.name> MIME-Version: 1.0 Content-Type: multipart/signed; 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charset="UTF-8"; protected-headers="v1" From: Oleksandr Natalenko To: Matthew Wilcox Date: Mon, 02 Oct 2023 17:38:48 +0200 Message-ID: <2160215.irdbgypaU6@natalenko.name> In-Reply-To: MIME-Version: 1.0 On pond=C4=9Bl=C3=AD 2. =C5=99=C3=ADjna 2023 16:32:45 CEST Matthew Wilcox w= rote: > On Mon, Oct 02, 2023 at 01:02:52PM +0200, Oleksandr Natalenko wrote: > > > > > > BUG: KFENCE: memory corruption in drm_gem_put_pages+0x186/0x250 > > > > > >=20 > > > > > > 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 > >=20 > > Matthew, before I start dancing around, do you think ^^ could have the = same cause as 0b62af28f249b9c4036a05acfb053058dc02e2e2 which got fixed by 8= 63a8eb3f27098b42772f668e3977ff4cae10b04? >=20 > 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. OK, I've did this against v6.5.5: ``` 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_batch" ``` then rebooted the host multiple times, and the issue is not seen any more. So I guess 3291e09a463870610b8227f32b16b19a587edf33 is the culprit. Thanks. =2D-=20 Oleksandr Natalenko (post-factum) --nextPart13361251.uLZWGnKmhe Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part. 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