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AHgh+Rpm1qV/qyfBksNMaEOuCuLPXyLhHLCLOI1LW5xqcUAntBQWgqQKfF5+bILBQkPpm6ml0BVFnv9WbO+S+8Y=@vger.kernel.org X-Gm-Message-State: AFuF++lUbsF0gjR06ykCltJ4Fk1LnpxyWtiNb3qUWtP/Q8brhy2NDjmu Q1muVqoGBJFIr2FBLfjIPwV2tMwta0hqBD71PZ9Fs19/avY1DXq6oBpOTG2HoD8eKSvWNineJpe ZPSvmd9buFN4Sw1WlWQsK7cKSHqN0ILr+o0fsOsSLeFlFwGEnU7CWBNDMmgU= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:190f:b0:4b3:74d0:6ef7 with SMTP id 5614622812f47-4b398037cdamr18008160b6e.4.1788087930233; Sun, 30 Aug 2026 04:05:30 -0700 (PDT) Date: Sun, 30 Aug 2026 04:05:30 -0700 In-Reply-To: <6a6c59a4.77639fcc.3d4fd0.0022.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a940e7a.4d659fcc.734b4.0037.GAE@google.com> Subject: Re: [syzbot] [dri?] WARNING in __drm_atomic_helper_set_config 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: 08dbfad3f504 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13380349580000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c5c3949d762a91f dashboard link: https://syzkaller.appspot.com/bug?extid=ca23c8570669ead78867 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=17392379580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17380349580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/e64f94ffb05c/disk-08dbfad3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/36a861364fe8/vmlinux-08dbfad3.xz kernel image: https://storage.googleapis.com/syzbot-assets/6130bd19ca7f/bzImage-08dbfad3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca23c8570669ead78867@syzkaller.appspotmail.com ------------[ cut here ]------------ !set->fb WARNING: drivers/gpu/drm/drm_atomic.c:2031 at __drm_atomic_helper_set_config+0xa45/0xee0 drivers/gpu/drm/drm_atomic.c:2031, CPU#1: syz-executor419/5624 Modules linked in: CPU: 1 UID: 0 PID: 5624 Comm: syz-executor419 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__drm_atomic_helper_set_config+0xa45/0xee0 drivers/gpu/drm/drm_atomic.c:2031 Code: 84 c0 74 09 3c 03 7f 05 e8 28 6e b4 fc 45 89 75 38 e9 0e fb ff ff e8 6a 5b 41 fc 90 0f 0b 90 e9 9f f7 ff ff e8 5c 5b 41 fc 90 <0f> 0b 90 e9 47 f7 ff ff 8b 6c 24 28 e8 4a 5b 41 fc 49 8d 7c 24 08 RSP: 0018:ffffc900036d7890 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8880349c1000 RCX: 0000000000000000 RDX: ffff88802f3dcb00 RSI: ffffffff85ca8bd4 RDI: ffff88802f3dcb00 RBP: ffff8880315d3800 R08: 0000000000000007 R09: fffffffffffff000 R10: ffff888028212c00 R11: 0000000000000000 R12: ffff88801c14e400 R13: ffff888028212c00 R14: ffff888028210c00 R15: ffff8880332d5328 FS: 0000000000000000(0000) GS:ffff888123c64000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcfbaa06a8 CR3: 0000000033c3a000 CR4: 00000000003526f0 Call Trace: drm_client_modeset_commit_atomic+0x53d/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1085 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1207 drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1233 __drm_fb_helper_restore_fbdev_mode_unlocked.part.0+0x137/0x160 drivers/gpu/drm/drm_fb_helper.c:138 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:126 [inline] drm_fb_helper_restore_fbdev_mode_unlocked+0x93/0xc0 drivers/gpu/drm/drm_fb_helper.c:169 drm_fbdev_client_restore+0x1b/0x30 drivers/gpu/drm/clients/drm_fbdev_client.c:45 drm_client_dev_restore+0x205/0x2a0 drivers/gpu/drm/drm_client_event.c:118 drm_lastclose drivers/gpu/drm/drm_file.c:408 [inline] drm_release+0x2c6/0x360 drivers/gpu/drm/drm_file.c:441 __fput+0x3ff/0xb50 fs/file_table.c:512 task_work_run+0x150/0x240 kernel/task_work.c:233 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x951/0x2ae0 kernel/exit.c:1008 do_group_exit+0xd5/0x2a0 kernel/exit.c:1151 __do_sys_exit_group kernel/exit.c:1162 [inline] __se_sys_exit_group kernel/exit.c:1160 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1160 x64_sys_call+0x1567/0x1570 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2694f1eb65 Code: Unable to access opcode bytes at 0x7f2694f1eb3b. RSP: 002b:00007ffcb598ab38 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007f2694f1eb65 RDX: 00000000000000e7 RSI: ffffffffffffffd8 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 R13: 00007f2694fb7108 R14: 00007f2694fbc648 R15: 00007f2694fbc660 --- 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.