From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f78.google.com (mail-oo1-f78.google.com [209.85.161.78]) (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 5FD6A440629 for ; Wed, 16 Sep 2026 07:19:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789543154; cv=none; b=ZWxhIWHwH4NqASysBHSqwWzkiRePES4LaOy801R3LkqRtygAOctgguzzj8iruHT51G9PbTjzMwFIuqdLYUlLjfy66KRmGHQiCcKzhVsqCwptViDQQZ6biDpdTdH/bWEOZOb3MQskzf3BdBeduvNA+qVYAmK0cOzv2PfWbbaTmDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789543154; c=relaxed/simple; bh=N7PrNTzy/vsNmBL45c5uKyZrOKn/qnoIUzh9V/rVCbE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=X6R97FwzODiyPklQv7UptIUJXxO24yjTxTOLRjjpaJ59z7DUiQhpCygAvBbcJQYiMpIx5O08uRL7OTjBbJdO9x0hCjDEQLQKlqy5ybWOh/M6r3biz8wevj55mRoRh2uiJt/FMXLd7Dj2+7YYn5FAprQKk1f1dm5B7OwffiU3MdE= 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=209.85.161.78 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-oo1-f78.google.com with SMTP id 006d021491bc7-6c2d5235ac3so2300710eaf.0 for ; Wed, 16 Sep 2026 00:19:07 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1789543144; x=1790147944; h=content-transfer-encoding:content-type:cc: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=N7PrNTzy/vsNmBL45c5uKyZrOKn/qnoIUzh9V/rVCbE=; b=sUrjRz6YJZLJkbXQrFO7IM/s50CVoyhfflrPKksxkprWzzJgG8qPmhuafPN8Q0z4su rvmianoPironMmifeBEF77LbJ5Mp6suxrmyIL0KX6eSwUQTgiyVjpIU9ZEwKjpZz66am s7w56/iSgf8FuJaaRUKfxXWIrsTbph/v8X7NQyxpXf3GPZSVXXC6bCC8kZEdModnAqxx +rC9FyjHQluk3pth0r7THff31I2COd5j2vq03JeH553MGWYmMWn5Zkdy0Z4b5do6fJux b1AXsiVP4E9HCuX1pyUn//tGNDH1fFmU0wRMmw6C1mNXylHWoK4PbepZZCybENMJmc92 WjQA== X-Forwarded-Encrypted: i=1; AKwUvBxjcGHaOIYKl2bkTq7k1fpz3JiA54iTi4kySj9MfzbZVPff3ImfLtlGj+MhFQBUI1JJkJu6gFJVSUrxFbE=@vger.kernel.org X-Gm-Message-State: AFuF++l5nND8sesaqe8EMn3Tr5yj1p2bnQakqTSR97IgIdV3Nsfvj2B0 J+x1rK9MUQnUO1iuZjPQvdCURAO1GguGHc/wZ44cp1090NrgxNNGfR+w6+EyTQlsTHH5xTpQTtQ ZQ0df+P6+716Y2az91RNA+jeYrokBVOFdCzSAO9QYaQaZ4prXesdK0ozFWZM= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4cc9:b0:6aa:e367:a3e2 with SMTP id 006d021491bc7-6c6383ceff2mr4593368eaf.19.1789543144670; Wed, 16 Sep 2026 00:19:04 -0700 (PDT) Date: Wed, 16 Sep 2026 00:19:04 -0700 In-Reply-To: <29630655-c3f4-4958-b22b-f1bfd8e76419n@googlegroups.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aaa42e8.a211d2ce.1a5198.02b8.GAE@google.com> Subject: Re: [syzbot] [dri?] [virt?] WARNING in virtio_gpu_free_object From: syzbot To: tao1.yu@intel.com Cc: syzkaller-bugs@googlegroups.com, tao1.yu@intel.com, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable > #syz test: https://github.com/yutao-intel/linux.git=20 This crash does not have a reproducer. I cannot test it. > fix-virtio_gpu_free_object > > On Wednesday, September 2, 2026 at 9:38:26=E2=80=AFPM UTC+8 syzbot wrote: > >> 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=3D160c01255800= 00 >> kernel config: https://syzkaller.appspot.com/x/.config?x=3D8c5c3949d762a= 91f >> dashboard link:=20 >> https://syzkaller.appspot.com/bug?extid=3D3590d97d8a586fa955c2 >> compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian= )=20 >> 2.44 >> >> Unfortunately, I don't have any reproducer for this issue yet. >> >> Downloadable assets: >> disk image (non-bootable):=20 >> https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_d= isk-786262be.raw.xz >> vmlinux:=20 >> https://storage.googleapis.com/syzbot-assets/1729d9f9738d/vmlinux-786262= be.xz >> kernel image:=20 >> https://storage.googleapis.com/syzbot-assets/ce8b90b3526c/bzImage-786262= be.xz >> >> IMPORTANT: if you fix the issue, please add the following tag to the=20 >> commit: >> Reported-by: syzbot+3590d9...@syzkaller.appspotmail.com >> >> ------------[ cut here ]------------ >> DEBUG_LOCKS_WARN_ON(lock->magic !=3D lock) >> WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common=20 >> kernel/locking/mutex.c:625 [inline], CPU#0: syz.2.124/6285 >> WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x944/0x1bd0=20 >> 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=20 >> PREEMPT(full)=20 >> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS=20 >> 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=20 >> 45 85 c0 75 13 48 8d 3d ac 21 77 05 48 c7 c6 e0 f3 ef 8b <67> 48 0f b9 3= a=20 >> 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:0000000000000= 000 >> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 >> CR2: 000055619ef79490 CR3: 000000005c38c000 CR4: 0000000000352ef0 >> Call Trace: >> >> virtio_gpu_remove_from_restore_list=20 >> drivers/gpu/drm/virtio/virtgpu_object.c:70 [inline] >> virtio_gpu_free_object+0xec/0x280=20 >> 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= =20 >> [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=20 >> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 f= f=20 >> 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 syzk...@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 >> > > --=20 > You received this message because you are subscribed to the Google Groups= "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an= email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion visit https://groups.google.com/d/msgid/syzkaller= -bugs/29630655-c3f4-4958-b22b-f1bfd8e76419n%40googlegroups.com.