From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f78.google.com (mail-oa1-f78.google.com [209.85.160.78]) (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 722A61AC45D for ; Wed, 27 May 2026 22:06:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779919593; cv=none; b=hjIeqgcHwAnok84RwRm1uYOKT9gQXvZhhwDWG8Cy6JJUzF2ysOh5vAwFI6X2WbJZU6hoorilgyEUukna5rMBrpcBamzoDQPzxwJSSAqWGlEdr9Bxwd2iwcN+r4vnHUL4s0HObvbCIsxUd7aIhhgF0HbH6XJdPK0aMJFflb4PdDo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779919593; c=relaxed/simple; bh=cvb7hQJqt1Dju0AK91eu2Ya846lUnhqt6RPvvSuERFo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=AKYytFaRs6h+KDakq25hSfLElg67YbYZHOdHxribTTIOi3xwSbiFTqMQFzvMA3Vh1+3tr5WS5LAKZb6hXMBkTPEIHkPIUHTDWWz9AJUCZp9wxgsodeh9jOexJDeHikw9JjyqTudatc/yqI39ZEN9Rjt0Kh7+zFUPKPYxuToZsus= 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=209.85.160.78 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-oa1-f78.google.com with SMTP id 586e51a60fabf-43a5232c87eso5314205fac.3 for ; Wed, 27 May 2026 15:06:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1779919590; x=1780524390; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=NA5/KnErm1XNnMMMcMghiPaIGjepl4VXf+uvQWVvmZ4=; b=bjL98MnN/JdoMFVb9Etd3X/S4rMpzpUAcAH27/PjAGyVtaI0r3uhv6702ooPf55OBn UNNg4izbHFEC7oUVTzVxKdOZ+siGiD003A+ZUOldCZi0w0e2I0TJNhBLDYB0FOx/Wxb0 1WALFrxTTkG2POdI6I+CTAXwrIGhvpi/aAJmFoBT29l67N6oBKHO6J0dy0PcycPxY07M x4hSFz73vOx8jD5+v/+sK4AxlzYLpH2deMBxItn4eaJwx+uoku2qtE9lkFN8HV5YkqHj A7A3Vw2xECi40hl5+mi2pbSko8tqc7gWKJ4dfvI5cjWVXD+hEsmJE/jr44yNI2q+l7fw CsBw== X-Forwarded-Encrypted: i=1; AFNElJ9pR67jF+i1pYm6hMkSMr8+WK3XyATngvBQX/oBfabwEv1bO74oe4N+KqMwDMwEvp9t8zqkffgLkeZCMto=@vger.kernel.org X-Gm-Message-State: AOJu0YzmbBsnEUTQSMXyEgQEg8ONkzyAd8ciRYdgphD2IwnQ037dRbpk yz7M56BCTVtAflUMinl7lg6v1pEoJzqdXHEZwV61doWA5aXPSiXqfWrQ5vKHiyElEyMUeUopetq QcsbxTR03GcRWkrc2zD7+C5AgRw5kvpoVmkhShATPr+IMjtyVvnji5VMFDls= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:621:b0:69d:8cc2:332f with SMTP id 006d021491bc7-69d8cc23537mr11608142eaf.57.1779919590333; Wed, 27 May 2026 15:06:30 -0700 (PDT) Date: Wed, 27 May 2026 15:06:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a176ae6.d07c18fe.1069e4.0016.GAE@google.com> Subject: [syzbot] [dri?] WARNING in drm_atomic_helper_wait_for_vblanks (6) 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" Hello, syzbot found the following issue on: HEAD commit: 79bd2dded182 Merge tag 'sched_ext-for-7.1-rc4-fixes' of gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12282ac8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e327ee9a867dd6b9 dashboard link: https://syzkaller.appspot.com/bug?extid=45bc7264de77caad91cb 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-79bd2dde.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/334fd806b634/vmlinux-79bd2dde.xz kernel image: https://storage.googleapis.com/syzbot-assets/dc1d1c63d028/bzImage-79bd2dde.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+45bc7264de77caad91cb@syzkaller.appspotmail.com ------------[ cut here ]------------ [CRTC:39:crtc-0] vblank wait timed out WARNING: drivers/gpu/drm/drm_atomic_helper.c:1921 at drm_atomic_helper_wait_for_vblanks.part.0+0x738/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1921, CPU#1: kworker/1:1/54 Modules linked in: CPU: 1 UID: 0 PID: 54 Comm: kworker/1:1 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Workqueue: events drm_fb_helper_damage_work RIP: 0010:drm_atomic_helper_wait_for_vblanks.part.0+0x73e/0x8a0 drivers/gpu/drm/drm_atomic_helper.c:1921 Code: 00 00 00 fc ff df 48 89 f9 48 c1 e9 03 0f b6 04 01 84 c0 74 08 3c 03 0f 8e 44 01 00 00 48 8d 3d e8 b2 3a 0b 8b b3 d0 00 00 00 <67> 48 0f b9 3a e9 e1 fc ff ff e8 43 4e 60 fc e9 7c fe ff ff e8 e9 RSP: 0018:ffffc90000a7f6e8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888100fa0040 RCX: 1ffff110201f4022 RDX: ffff888025b8c780 RSI: 0000000000000027 RDI: ffffffff90e31630 RBP: dffffc0000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88802a6c0200 FS: 0000000000000000(0000) GS:ffff8880d646a000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fea94fea540 CR3: 000000002e244000 CR4: 0000000000352ef0 Call Trace: drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1895 [inline] drm_atomic_helper_commit_tail+0xff/0x130 drivers/gpu/drm/drm_atomic_helper.c:1997 commit_tail+0x338/0x430 drivers/gpu/drm/drm_atomic_helper.c:2074 drm_atomic_helper_commit+0x303/0x380 drivers/gpu/drm/drm_atomic_helper.c:2312 drm_atomic_commit+0x230/0x300 drivers/gpu/drm/drm_atomic.c:1789 drm_atomic_helper_dirtyfb+0x603/0x790 drivers/gpu/drm/drm_damage_helper.c:183 drm_fbdev_shmem_helper_fb_dirty+0x1cc/0x310 drivers/gpu/drm/drm_fbdev_shmem.c:117 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:249 [inline] drm_fb_helper_damage_work+0x348/0x640 drivers/gpu/drm/drm_fb_helper.c:275 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 fc add %bh,%ah 4: ff lcall (bad) 5: df 48 89 fisttps -0x77(%rax) 8: f9 stc 9: 48 c1 e9 03 shr $0x3,%rcx d: 0f b6 04 01 movzbl (%rcx,%rax,1),%eax 11: 84 c0 test %al,%al 13: 74 08 je 0x1d 15: 3c 03 cmp $0x3,%al 17: 0f 8e 44 01 00 00 jle 0x161 1d: 48 8d 3d e8 b2 3a 0b lea 0xb3ab2e8(%rip),%rdi # 0xb3ab30c 24: 8b b3 d0 00 00 00 mov 0xd0(%rbx),%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: e9 e1 fc ff ff jmp 0xfffffd15 34: e8 43 4e 60 fc call 0xfc604e7c 39: e9 7c fe ff ff jmp 0xfffffeba 3e: e8 .byte 0xe8 3f: e9 .byte 0xe9 --- 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