From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f79.google.com (mail-oa1-f79.google.com [209.85.160.79]) (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 BA38730F7FF for ; Sun, 9 Aug 2026 20:57:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.79 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786309052; cv=none; b=NaEs0CGZptpuReLiKUKmAzDnF42Nls6PZ6SP/R4gkzcqWSUkRpsA4H/C1xuYzMYhhQvBxHQcTnsJU0pCkCPZGMZNTt0fhTp/xHsNbWbayVN09dzZIv+kd8y0b64YwI+RB03w0qv+4fXwuEqzrwpF3zL+Atb8/jPqAa2+KhBtQSg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786309052; c=relaxed/simple; bh=VlK+leGivKa5/VlHoD6dzlAMTSNeAiQ2IkSl9fHeLE0=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=DFdFl3lZNk446rJyT4E1+QHPOw6gPFVRC8AjHS4mJ5hng4nGnbKNvhxvGXsiqsflLXAxHHQwtyWR1HzWuq0B1zkO6iqSQqxmHEDl5uOxn3NH4j/9i8o5zjSZj/pTpcU7YWpC+WxZQXu5BM8SjdMIhBo3lc5n7y0CPgMKSwd8VYE= 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=209.85.160.79 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-f79.google.com with SMTP id 586e51a60fabf-4566537e644so1615342fac.0 for ; Sun, 09 Aug 2026 13:57:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786309049; x=1786913849; 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=atwEu8HESbm0J0ZZc0329Or+Bt8/+trpH9BPhYs3H60=; b=Kxip1fRXi51R/GfqvXr4P2XJopdkPwe8BgS2wOkm7aTjoGtNONp+EVq/Cgxkc8BGuq ByNhlgkEuzOSw7Rtg0jYhGz3c8TRdStyP7s+i2ivyWUISZlMH4aJKVkgyIJ5VbO4etSh uNZ+3Kq1VO+6fLX831c21UtlVS+JzRLm7R+9lPTHWnV/udlQ3dwH8389O8HY6iUyfkA1 U0ZAXnRApnmEDSpOXhX4X2+ekPpF5Y10TgVZyRYpOSWd9EixLSV2rJc7HT1i2C9WoTG/ dbgfKvO5290Ulwhy/AAYZFYGMseRgIhZSfsOKrok0oJa5iYfAWd4VFWfPrN+3uAsmsaT 7LzQ== X-Forwarded-Encrypted: i=1; AHgh+Rqk4x3UrwFDyieUZVNUJlrqtnygyZEtFu6Uj1/qJ08dvt0sI9tXyG1e1t1zTZNfxaXfl3AQZx8Y1/N+t6w=@vger.kernel.org X-Gm-Message-State: AOJu0YxkR+5+5kzqvxTVnbtnDuKSevyJyWC851HXtLt2iD2vXuuGQzju yabbbglOEY/FIcmmdQrf8eR0It5RrXqwPtvwsgj5h6pOv2j5nqUx/dVyo6W9+wTZqPBu3JK5h4Y ULL8JxokwnCeJStf6o7SqCrBZSGj5IOdC6X28S+OosPSzXoip3N3XGhnShB4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:987:b0:6aa:e573:9ce0 with SMTP id 006d021491bc7-6ae96d0b246mr21753340eaf.16.1786309049629; Sun, 09 Aug 2026 13:57:29 -0700 (PDT) Date: Sun, 09 Aug 2026 13:57:29 -0700 In-Reply-To: <6a69609d.d9e86bb5.297b12.004a.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a78e9b9.01d0871a.3a0d52.0094.GAE@google.com> Subject: Re: [syzbot] [dri?] WARNING in drm_mm_takedown From: syzbot To: airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, simona@ffwll.ch, syzkaller-bugs@googlegroups.com, tzimmermann@suse.de Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: b643e495ae92 Merge tag 's390-7.2-7' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1531a2c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 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 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=138cdfb9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1373ffb9580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-b643e495.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/9eb4fbda136d/vmlinux-b643e495.xz kernel image: https://storage.googleapis.com/syzbot-assets/53cbbd75c40a/bzImage-b643e495.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d93b9064fe5f74af3aa3@syzkaller.appspotmail.com 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.0.28/5943 Modules linked in: CPU: 0 UID: 0 PID: 5943 Comm: syz.0.28 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 3b 0e 45 fc 48 83 c4 08 5b 5d 41 5c 41 5d 41 5e e9 0a 9f f8 05 e8 25 0e 45 fc 48 8d 3d 2e cb 67 0b <67> 48 0f b9 3a 48 c7 c0 e0 13 47 8e 48 ba 00 00 00 00 00 fc ff df RSP: 0018:ffffc90003aff790 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88802b8a0c68 RCX: ffffffff85c5509b RDX: ffff888030942540 RSI: ffffffff85c5655b RDI: ffffffff912d3090 RBP: ffff88802b8a0ca0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888029bdb900 R13: ffff888029bdb918 R14: ffffffff85c44260 R15: 0000000000000000 FS: 000055557bc5c500(0000) GS:ffff8880d5dec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00001c245591d000 CR3: 0000000038e44000 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: 0033:0x7fa232f9e0d9 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:00007ffd4f8ff7c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa233225fa0 RCX: 00007fa232f9e0d9 RDX: 0000000000000001 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fa233035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa233225fac R14: 00007fa233225fa0 R15: 00007fa233225fa0 ---------------- 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 3b 0e 45 fc call 0xfc450e48 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: e9 0a 9f f8 05 jmp 0x5f89f28 1e: e8 25 0e 45 fc call 0xfc450e48 23: 48 8d 3d 2e cb 67 0b lea 0xb67cb2e(%rip),%rdi # 0xb67cb58 * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 48 c7 c0 e0 13 47 8e mov $0xffffffff8e4713e0,%rax 36: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 3d: fc ff df --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.