From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 DF4A31A9F96 for ; Sun, 2 Aug 2026 07:26:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785655591; cv=none; b=Q2Ku7QHZ1IGwVxA7zN26yp3HMc8WVkLxTc48rrI9PdbRMTqco+eAD9k74OWjkK3ceM3+vc07sY3X7b8Xk7CPjOAu3sllvs3giYNTjEt9wep9P+59PdL4qRH36uOXERkWXpqhUm399Q/7C2WZloH0wWiVAD6M84HxECCWN4NpI0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785655591; c=relaxed/simple; bh=ecvRhkpEPZSsJ4bF9YrNd86GWe7gBEeb6Cqm7Vy+pQE=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Sr0lJZNhiIpDYC+suh0prX0S2s1DyHfKPSsNfDj4qZpHQk4+8kZ+9GkKhkeBJ6055QR3JAbeMQ9tGCkCsiG7rFVP34jmFBEXHOer2lZ+rs3/n63l0oJzYisxDVBHyv82kh9YR3oO2YYjNzCO9Tl5vh57bKiht0U6aCHOjnT8hUU= 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=209.85.167.205 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-oi1-f205.google.com with SMTP id 5614622812f47-4a36606e230so3422557b6e.2 for ; Sun, 02 Aug 2026 00:26:29 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785655589; x=1786260389; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=rFAZOHpoOzdEC72mhCLaIi2Ir9J0fgzUfWqu96TAK+A=; b=K4iVsZNcw4rZDnd1hOfhV3APcXSSPIBHNH1zDp7OXPc/cjqbTaxJQHUBlKcUYU+uyN XeNqvy7lbIllVrKNKPvSHiwT1p4aEIOyZedPxECkJ3gNQo6h0LFTBJ9ldm/al+DwGf3P MeVqkqyQYOtLVY50T8np/mgLcatjh/hqb9d1Gj/MIhByY9k1ujledEc1Ap04QEXvOx4C TP8wfwqTkJseCzFV4+Y842FtwIk9kyKXd1Ig9XIMBS52bA3GSxw9KcZ1Q48biESCYH2x eWioiG92I1dfhZeXb/QoYzPd8VAXALRkcn4n4D2C4WZSGKiukqQhxUsPgVyrGjx0nsuc fkNQ== X-Forwarded-Encrypted: i=1; AHgh+RrKon+4IJzid2V8Wfl+/D228ZySNOf1a1mg6Srm7i8BHjrDLRP0e5H54ERFJe44qDvEPu+sQupCdl3sQG4=@vger.kernel.org X-Gm-Message-State: AOJu0Yy96vseK9r1PXDQ2TvoH9tI2X99IZ50Rp1bn/iqYYtoQ89yzRVP pjMIqMnZWiQSCn5oDmbf09G+hDL5or11WvtmTPIeeA+J7wtbb3w8bVsVmCwUh5nnW3UwjVB2bnD e4RxTJ4bz2Zkgy3js2ZYbfthsQP0N+EhAe7Q7WqhZwgAkFhaWDRD3uKbTXD4= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:3986:b0:4a0:d9a1:1a95 with SMTP id 5614622812f47-4af5e39474emr9225337b6e.14.1785655588794; Sun, 02 Aug 2026 00:26:28 -0700 (PDT) Date: Sun, 02 Aug 2026 00:26:28 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a6ef124.d606a800.1705cf.000a.GAE@google.com> Subject: [syzbot] [virt?] [dri?] WARNING in virtio_gpu_free_vbufs From: syzbot To: airlied@redhat.com, dmitry.osipenko@collabora.com, dri-devel@lists.freedesktop.org, gurchetansingh@chromium.org, kraxel@redhat.com, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, olvaffe@gmail.com, simona@ffwll.ch, syzkaller-bugs@googlegroups.com, tzimmermann@suse.de, virtualization@lists.linux.dev Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 02dc699f83d0 Merge tag 'kbuild-fixes-7.2-1' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17ee74c6580000 kernel config: https://syzkaller.appspot.com/x/.config?x=145fa60d73086782 dashboard link: https://syzkaller.appspot.com/bug?extid=06f9b2a53ba4a5a47644 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-02dc699f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/faf03a1fb300/vmlinux-02dc699f.xz kernel image: https://storage.googleapis.com/syzbot-assets/a48e50ceca1d/bzImage-02dc699f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06f9b2a53ba4a5a47644@syzkaller.appspotmail.com Slab 0xffffea0000db2e80 objects=29 used=2 fp=0xffff888036cba000 flags=0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) Disabling lock debugging due to kernel taint ------------[ cut here ]------------ 1 WARNING: mm/slub.c:1244 at __slab_err+0x15/0x20 mm/slub.c:1244, CPU#1: syz.5.2129/14034 Modules linked in: CPU: 1 UID: 0 PID: 14034 Comm: syz.5.2129 Tainted: G B L syzkaller #0 PREEMPT(full) Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:__slab_err+0x15/0x20 mm/slub.c:1244 Code: 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 5b fd ff ff be 01 00 00 00 bf 05 00 00 00 e8 dc ba a2 00 90 <0f> 0b 90 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000636f738 EFLAGS: 00010083 RAX: 00000000000205dc RBX: ffffc9000636f788 RCX: ffffc9000c781000 RDX: 0000000000080000 RSI: ffffffff81c709bd RDI: ffff88802996ca80 RBP: ffff888027f80558 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000001ea0 R13: ffff888036cbbfb8 R14: ffff888027f80540 R15: ffffea0000db2e80 FS: 00007f9b5db516c0(0000) GS:ffff8880d5ed8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c30fb1e CR3: 000000005bdcb000 CR4: 0000000000352ef0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: list_slab_objects mm/slub.c:7994 [inline] free_partial mm/slub.c:8015 [inline] __kmem_cache_shutdown.cold+0x16e/0x177 mm/slub.c:8058 kmem_cache_destroy mm/slab_common.c:569 [inline] kmem_cache_destroy+0x73/0x190 mm/slab_common.c:527 virtio_gpu_free_vbufs+0x38/0x80 drivers/gpu/drm/virtio/virtgpu_vq.c:86 virtio_gpu_release+0x5c/0x1c0 drivers/gpu/drm/virtio/virtgpu_kms.c:312 drm_dev_release drivers/gpu/drm/drm_drv.c:912 [inline] kref_put include/linux/kref.h:65 [inline] drm_dev_put.part.0+0xbd/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: 0033:0x7f9b5cb9e019 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:00007f9b5db51028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9b5ce25fa0 RCX: 00007f9b5cb9e019 RDX: 0000000000000001 RSI: 0000200000000800 RDI: 0000000000000006 RBP: 00007f9b5cc3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9b5ce26038 R14: 00007f9b5ce25fa0 R15: 00007ffeee83f378 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup