From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f71.google.com (mail-oa1-f71.google.com [209.85.160.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C94C03C109F for ; Tue, 25 Aug 2026 06:23:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787638984; cv=none; b=JpDfaEumSHLXIDekl2EWmjcCVNL/RjU0T6HkCB6gzYU57tsV+5jpg8Hdlty07DVYC0K13WgOpXY2VIP/5zgdTRBvYeih2kX9QbmAdaKNeJ7GUbhjJNHpbULy35da4yNL9exjQdNnVbs3mYfT7Ges6f0AJ0/Y+72iWsQRcEHaYfs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787638984; c=relaxed/simple; bh=LBBKJzOhIvGT5UtqSiL2hlpNZItvVAMUBu6i+ajcXl0=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=ue9yFtx0Q7x3hiMN9af+vCTSDE4lIrD3QtMspMxlpZOTJL5sE0MX4u50KQOuOFDomRnwqmhIG9AjfMMFCo07re3qgRly6utLTc8zFL1cHxBsemSkQggJoS5W1v1/QgWDZvov9Tp9XHETEIx1RMMnYPInPI63MTvwN422TAk0VyQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.160.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa1-f71.google.com with SMTP id 586e51a60fabf-45a07949855so8109272fac.2 for ; Mon, 24 Aug 2026 23:23:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787638981; x=1788243781; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=vhWa9CuuTBMX2/ZRJYGHn7OPJVKpY/JHBmludkgnI44=; b=G0UVSDzLP3tpu1Y9F0P3U2M1TCkgZR1DGl+/PvPsXcjzLrw50S6KEf0SobUAwh7PKl /ffNh4hOCbZhW++RNF0+cCxQerlIoEqeEx+PX/UNqHyGZJYQ9Y6nBHOKS7GLBwuUMEpq jvGiXuT6a4eSwj3aPCv+SP63LNeDq8VOcIF08ZgqyzCyUpsgMcdrkZ7TCWG3/bmT05r6 tXgGYfk9stlfUZ3px9W3Dmsr6VMp7fOjoZJKkZmNdKtdSrpx6O926I9O9aunQF9IrkDo gyJL/KpbnA+XQPu8uDw9XgRo30K5JtOzGKUrbpnsyE8GzBBMEv2TBmWTO6+P4WkHUinh ceQQ== X-Gm-Message-State: AFuF++lc7Q1ZJ95EN7UiewLqEWRdy4bd02sR5n1Pz6dGJqKlda+Dpf7p qOkEkBrzYQTZavuCVob6dhfvHTW5V66CXuKg/KUt5tZxNWQUe5n2ckuGSfSRGbB1cOLyONFrJ9V zUDF+IuypwRO3uM/vfKAfZYErpGkb60hgW5zpM4TiwRd5dPoN594r7jyXzA0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:162a:b0:6ac:9729:6710 with SMTP id 006d021491bc7-6b16b4cc646mr21709622eaf.18.1787638981703; Mon, 24 Aug 2026 23:23:01 -0700 (PDT) Date: Mon, 24 Aug 2026 23:23:01 -0700 In-Reply-To: <30a3accb-d060-4a00-86da-d4e4c9ea7dcfn@googlegroups.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8d34c5.dbb3a75c.7844.0023.GAE@google.com> Subject: Re: [syzbot] [dri?] WARNING in drm_mm_takedown From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tao1.yu@intel.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in drm_mm_takedown Console: switching to colour dummy device 80x25 ------------[ cut here ]------------ Memory manager not clean during takedown. WARNING: drivers/gpu/drm/drm_mm.c:965 at drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965, CPU#0: syz.0.20/6274 Modules linked in: CPU: 0 UID: 0 PID: 6274 Comm: syz.0.20 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:drm_mm_takedown+0x62/0x280 drivers/gpu/drm/drm_mm.c:965 Code: 8b 43 38 48 39 c5 75 16 e8 eb 42 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e c3 cc cc cc cc e8 d5 42 45 fc 48 8d 3d 0e 72 68 0b <67> 48 0f b9 3a 48 c7 c0 e0 c3 46 8e 48 ba 00 00 00 00 00 fc ff df RSP: 0018:ffffc900039a7790 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888054192868 RCX: ffffffff85c4f8ab RDX: ffff888027242540 RSI: ffffffff85c50d6b RDI: ffffffff912d7f80 RBP: ffff8880541928a0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88803cab1800 R13: ffff88803cab1818 R14: ffffffff85c3ea70 R15: 0000000000000000 FS: 00007fc41db8e6c0(0000) GS:ffff8880d5df1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005555587e99e8 CR3: 0000000038517000 CR4: 0000000000352ef0 Call Trace: drm_managed_release+0x1bb/0x540 drivers/gpu/drm/drm_managed.c:75 drm_dev_release drivers/gpu/drm/drm_drv.c:914 [inline] kref_put include/linux/kref.h:65 [inline] drm_dev_put.part.0+0xca/0x140 drivers/gpu/drm/drm_drv.c:948 drm_dev_put+0x1f/0x30 drivers/gpu/drm/drm_drv.c:947 virtio_dev_remove+0xb8/0x170 drivers/virtio/virtio.c:375 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 bus_remove_device+0x2bc/0x560 drivers/base/bus.c:664 device_del+0x376/0x9b0 drivers/base/core.c:3961 device_unregister+0x1d/0xe0 drivers/base/core.c:4002 unregister_virtio_device+0x39/0x60 drivers/virtio/virtio.c:594 virtio_pci_remove+0x7c/0x110 drivers/virtio/virtio_pci_common.c:758 pci_device_remove+0xb2/0x1d0 drivers/pci/pci-driver.c:512 device_remove+0xcb/0x180 drivers/base/dd.c:616 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 pci_stop_dev drivers/pci/remove.c:27 [inline] pci_stop_bus_device+0x120/0x160 drivers/pci/remove.c:93 pci_stop_and_remove_bus_device+0x58/0xa0 drivers/pci/remove.c:128 pci_stop_and_remove_bus_device_locked+0x1a/0x20 drivers/pci/remove.c:136 remove_store+0x123/0x140 drivers/pci/pci-sysfs.c:523 dev_attr_store+0x58/0x80 drivers/base/core.c:2505 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc41cd9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc41db8e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fc41d025fa0 RCX: 00007fc41cd9e0d9 RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fc41ce35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc41d026038 R14: 00007fc41d025fa0 R15: 00007ffc43904ea8 ---------------- Code disassembly (best guess): 0: 8b 43 38 mov 0x38(%rbx),%eax 3: 48 39 c5 cmp %rax,%rbp 6: 75 16 jne 0x1e 8: e8 eb 42 45 fc call 0xfc4542f8 d: 48 83 c4 08 add $0x8,%rsp 11: 5b pop %rbx 12: 5d pop %rbp 13: 41 5c pop %r12 15: 41 5d pop %r13 17: 41 5e pop %r14 19: c3 ret 1a: cc int3 1b: cc int3 1c: cc int3 1d: cc int3 1e: e8 d5 42 45 fc call 0xfc4542f8 23: 48 8d 3d 0e 72 68 0b lea 0xb68720e(%rip),%rdi # 0xb687238 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 c7 c0 e0 c3 46 8e mov $0xffffffff8e46c3e0,%rax 36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 3d: fc ff df Tested on: commit: f04461ee drm/virtio: clear host-visible mappings befor.. git tree: https://github.com/yutao-intel/linux.git fix-dri-virtio-align-HEAD console output: https://syzkaller.appspot.com/x/log.txt?x=101a7549580000 kernel config: https://syzkaller.appspot.com/x/.config?x=acc0a882b963ae23 dashboard link: https://syzkaller.appspot.com/bug?extid=d93b9064fe5f74af3aa3 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Note: no patches were applied.