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Mon, 20 Nov 2023 06:20:07 -0800 (PST) Date: Mon, 20 Nov 2023 06:20:07 -0800 In-Reply-To: X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000d7992c060a962ecc@google.com> Subject: Re: [syzbot] [dri?] divide error in drm_mode_debug_printmodeline From: syzbot To: eadavis@qq.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in vkms_get_vblank_timestamp ------------[ cut here ]------------ WARNING: CPU: 0 PID: 25460 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x1cd/0x210 Modules linked in: CPU: 0 PID: 25460 Comm: syz-executor.0 Not tainted 6.6.0-syzkaller-16039-gac347a0655db-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:vkms_get_vblank_timestamp+0x1cd/0x210 drivers/gpu/drm/vkms/vkms_crtc.c:103 Code: 03 42 80 3c 28 00 74 08 48 89 ef e8 bd 71 3f fc 48 89 5d 00 b0 01 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 33 4f e3 fb <0f> 0b eb e6 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 7a fe ff ff 48 89 RSP: 0018:ffffc90003cc77c0 EFLAGS: 00010293 RAX: ffffffff85ab731d RBX: 00000042dda43dc6 RCX: ffff88807a465940 RDX: 0000000000000000 RSI: 00000042dda43dc6 RDI: 00000042dda43dc6 RBP: ffffc90003cc7960 R08: ffffffff85ab7289 R09: 0000000000000000 R10: ffffc900044e2000 R11: 0000000000000000 R12: 00000042dda43dc6 R13: 1ffff92000798f2c R14: 0000000000000000 R15: ffff88801c7d4000 FS: 00005555566d3480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8d999980c0 CR3: 0000000015f23000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: drm_crtc_get_last_vbltimestamp drivers/gpu/drm/drm_vblank.c:877 [inline] drm_crtc_next_vblank_start+0x229/0x460 drivers/gpu/drm/drm_vblank.c:1012 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1555 [inline] drm_atomic_helper_wait_for_fences+0x277/0x8d0 drivers/gpu/drm/drm_atomic_helper.c:1602 drm_atomic_helper_commit+0x627/0xbc0 drivers/gpu/drm/drm_atomic_helper.c:2031 drm_atomic_commit+0x279/0x2c0 drivers/gpu/drm/drm_atomic.c:1513 drm_client_modeset_commit_atomic+0x676/0x7d0 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_commit_locked+0xe0/0x510 drivers/gpu/drm/drm_client_modeset.c:1154 drm_client_modeset_commit+0x4a/0x70 drivers/gpu/drm/drm_client_modeset.c:1180 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline] drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:278 [inline] drm_fb_helper_lastclose+0xb7/0x170 drivers/gpu/drm/drm_fb_helper.c:2005 drm_fbdev_generic_client_restore+0x34/0x40 drivers/gpu/drm/drm_fbdev_generic.c:258 drm_client_dev_restore+0x131/0x260 drivers/gpu/drm/drm_client.c:257 drm_lastclose drivers/gpu/drm/drm_file.c:466 [inline] drm_release+0x4b2/0x660 drivers/gpu/drm/drm_file.c:497 __fput+0x3cc/0xa10 fs/file_table.c:394 __do_sys_close fs/open.c:1590 [inline] __se_sys_close+0x15f/0x220 fs/open.c:1575 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f8d9987b9da Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24 RSP: 002b:00007ffc140485c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00007f8d9987b9da RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000032 R08: 0000001b2e560000 R09: 00007f8d9999bf8c R10: 00007ffc14048710 R11: 0000000000000293 R12: 00007f8d99400c20 R13: ffffffffffffffff R14: 00007f8d99400000 R15: 00000000000461cf Tested on: commit: ac347a06 Merge tag 'arm64-fixes' of git://git.kernel.o.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=1691a6f0e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=88e7ba51eecd9cd6 dashboard link: https://syzkaller.appspot.com/bug?extid=2e93e6fb36e6fdc56574 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=137920af680000