From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f7.google.com (mail-oo2-f7.google.com [74.125.231.135]) (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 2133447B425 for ; Wed, 2 Sep 2026 13:38:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.135 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788356306; cv=none; b=eseEd2eR6FFibtdY7mhPR1Cx1PgL2VWGVBxj1wsh6il1zfNaAzb3s1ewQjDi86p+yh763Kv6i8zGggr3pbZUS2sJwit169+WrRtGcsJ0l0J+k7X22h5D44A5ywr/ofqzZCVUUb0TtyGIiEruNeG0Wylvua7SU0DppsZ3cjvhQ+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788356306; c=relaxed/simple; bh=YXDN7vq/imnSsYdudAHyrjR2kibHupd6KUos4uTRU0o=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=t2NDSOCA8Mo/EhDdKTelPlq6iZfNvjyAEQZWJrnxrEAgfu6Vg0pjj1Frl4/zkjZah6V9az1OTIj4HRECE8WORXcjyiopCwjFXAyLwKrG/dx+q8hzy2tBZSFt96t3mMMOb62bu65iBgontOTtvYpU2I6xksWHIky7CmBsr6k63W0= 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=74.125.231.135 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-oo2-f7.google.com with SMTP id 006d021491bc7-6b1bebb3ae8so294648eaf.1 for ; Wed, 02 Sep 2026 06:38:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1788356304; x=1788961104; 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=T4EUl0+l4ijrlzUvXL1HFtDQOMWNs5F7/Y3XbzXQpJ4=; b=LUdPLqcyVKlBOxbxaEJ8nNFMa74fahiq+m0HkFqMrMa03Z8Zn0KwFYKIG7qX+pUNF4 UXgzTIetTAlGHL3FWWAoH1tQsBHhIGlm8uTDqH0LF6g+JLk7T6fgc/Z8qikjqKW+7vo3 66xoeaXmkVPwBFGb3ABhtnjItIMTjCqzgEL3hT/xXjth22Viuo3y4QV8RyZYFsbDNWOC I5XXnIdKWQkD3TiZMZRyZQ0Lr+3P8bp60hGucKwrCiSb03PuW4kJahLBurySfzkVlYfq seHPDFpHpqbgaESgDsN8zQw9HjBJ8Wt/AfBIVY95n00ySUVSZ40MT23LjDOE/8OY7pA4 q9+A== X-Forwarded-Encrypted: i=1; AHgh+RrETRi+I5nRz5muxoy3v/tLyZnIFHC76t2I38FMYtZBsOo/khixF+Q3Dk7pklNkKce5Z/vAVg5vca8KYSc=@vger.kernel.org X-Gm-Message-State: AFuF++mS6cwLifQdW/mDpIFxke9nHjwJ/GAZXNv5OzDRMAIFUkAE4xzu 51COkzb0Z8zs0JjJ7qmtJwSoP9vZSjNmT8NIel1mKx89N0CCGcuAwqhWvyyXHybMuXIc7WX/UY4 WNM//xtnlQM0kBMhE/8efexVEgZ9hXymGSQ321J5OyP2O5j23T4NSpPTy9qk= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:200e:b0:6b1:4d1b:3004 with SMTP id 006d021491bc7-6b480e38546mr3412140eaf.20.1788356303977; Wed, 02 Sep 2026 06:38:23 -0700 (PDT) Date: Wed, 02 Sep 2026 06:38:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9826cf.9266084e.bf0d7.0008.GAE@google.com> Subject: [syzbot] [dri?] [virt?] WARNING in virtio_gpu_free_object 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: 786262be6048 Merge tag 'edac_updates_for_v7.3_rc2' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=160c0125580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=3590d97d8a586fa955c2 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-786262be.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1729d9f9738d/vmlinux-786262be.xz kernel image: https://storage.googleapis.com/syzbot-assets/ce8b90b3526c/bzImage-786262be.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3590d97d8a586fa955c2@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline], CPU#0: syz.2.124/6285 WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x944/0x1bd0 kernel/locking/mutex.c:821, CPU#0: syz.2.124/6285 Modules linked in: CPU: 0 UID: 0 PID: 6285 Comm: syz.2.124 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:__mutex_lock_common kernel/locking/mutex.c:625 [inline] RIP: 0010:__mutex_lock+0x94b/0x1bd0 kernel/locking/mutex.c:821 Code: 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 c0 10 00 00 44 8b 05 e8 16 74 05 45 85 c0 75 13 48 8d 3d ac 21 77 05 48 c7 c6 e0 f3 ef 8b <67> 48 0f b9 3a 90 e9 1b f8 ff ff 4d 8d a7 f0 0a 00 00 4c 89 e7 e8 RSP: 0018:ffffc90006017b30 EFLAGS: 00010246 RAX: 0000000000000003 RBX: ffff8880281551c0 RCX: 1ffffffff228a580 RDX: 0000000000000000 RSI: ffffffff8beff3e0 RDI: ffffffff914836d0 RBP: ffffc90006017ca0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: ffff888027efeb60 FS: 00007f5302d486c0(0000) GS:ffff8880d5b64000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055619ef79490 CR3: 000000005c38c000 CR4: 0000000000352ef0 Call Trace: virtio_gpu_remove_from_restore_list drivers/gpu/drm/virtio/virtgpu_object.c:70 [inline] virtio_gpu_free_object+0xec/0x280 drivers/gpu/drm/virtio/virtgpu_object.c:106 drm_gem_object_free+0x60/0xa0 drivers/gpu/drm/drm_gem.c:1164 kref_put include/linux/kref.h:65 [inline] __drm_gem_object_put include/drm/drm_gem.h:562 [inline] drm_gem_object_put include/drm/drm_gem.h:575 [inline] drm_gem_object_put include/drm/drm_gem.h:572 [inline] drm_client_buffer_delete drivers/gpu/drm/drm_client.c:201 [inline] drm_client_buffer_delete+0x1d8/0x270 drivers/gpu/drm/drm_client.c:185 drm_fbdev_shmem_fb_destroy+0xc5/0x110 drivers/gpu/drm/drm_fbdev_shmem.c:67 put_fb_info drivers/video/fbdev/core/fbmem.c:61 [inline] put_fb_info+0xb8/0xf0 drivers/video/fbdev/core/fbmem.c:56 fb_release+0x13e/0x190 drivers/video/fbdev/core/fb_chrdev.c:381 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] __exit_to_user_mode_loop kernel/entry/common.c:70 [inline] exit_to_user_mode_loop+0x1d8/0x700 kernel/entry/common.c:101 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:336 [inline] do_syscall_64+0x661/0x790 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5301d9e159 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:00007f5302d48028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00007f5302025fa0 RCX: 00007f5301d9e159 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000 RBP: 00007f5301e35024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5302026038 R14: 00007f5302025fa0 R15: 00007fffc5d9f388 ---------------- Code disassembly (best guess): 0: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 4: 38 d0 cmp %dl,%al 6: 7c 08 jl 0x10 8: 84 d2 test %dl,%dl a: 0f 85 c0 10 00 00 jne 0x10d0 10: 44 8b 05 e8 16 74 05 mov 0x57416e8(%rip),%r8d # 0x57416ff 17: 45 85 c0 test %r8d,%r8d 1a: 75 13 jne 0x2f 1c: 48 8d 3d ac 21 77 05 lea 0x57721ac(%rip),%rdi # 0x57721cf 23: 48 c7 c6 e0 f3 ef 8b mov $0xffffffff8beff3e0,%rsi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 90 nop 30: e9 1b f8 ff ff jmp 0xfffff850 35: 4d 8d a7 f0 0a 00 00 lea 0xaf0(%r15),%r12 3c: 4c 89 e7 mov %r12,%rdi 3f: e8 .byte 0xe8 --- 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