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Tue, 9 Dec 2025 14:35:52 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 7xGnEMgzOGnqWQAAD6G6ig (envelope-from ); Tue, 09 Dec 2025 14:35:52 +0000 Message-ID: <337993e9-2f99-42ad-97c0-3a4a5a4de972@suse.de> Date: Tue, 9 Dec 2025 15:35:51 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [dri?] WARNING in drm_atomic_helper_wait_for_vblanks (5) To: syzbot , 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 References: <69381d6c.050a0220.4004e.0017.GAE@google.com> Content-Language: en-US From: Thomas Zimmermann Autocrypt: addr=tzimmermann@suse.de; keydata= xsBNBFs50uABCADEHPidWt974CaxBVbrIBwqcq/WURinJ3+2WlIrKWspiP83vfZKaXhFYsdg XH47fDVbPPj+d6tQrw5lPQCyqjwrCPYnq3WlIBnGPJ4/jreTL6V+qfKRDlGLWFjZcsrPJGE0 BeB5BbqP5erN1qylK9i3gPoQjXGhpBpQYwRrEyQyjuvk+Ev0K1Jc5tVDeJAuau3TGNgah4Yc hdHm3bkPjz9EErV85RwvImQ1dptvx6s7xzwXTgGAsaYZsL8WCwDaTuqFa1d1jjlaxg6+tZsB 9GluwvIhSezPgnEmimZDkGnZRRSFiGP8yjqTjjWuf0bSj5rUnTGiyLyRZRNGcXmu6hjlABEB AAHNJ1Rob21hcyBaaW1tZXJtYW5uIDx0emltbWVybWFubkBzdXNlLmRlPsLAjgQTAQgAOAIb AwULCQgHAgYVCgkICwIEFgIDAQIeAQIXgBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftODH AAoJEGgNwR1TC3ojx1wH/0hKGWugiqDgLNXLRD/4TfHBEKmxIrmfu9Z5t7vwUKfwhFL6hqvo lXPJJKQpQ2z8+X2vZm/slsLn7J1yjrOsoJhKABDi+3QWWSGkaGwRJAdPVVyJMfJRNNNIKwVb U6B1BkX2XDKDGffF4TxlOpSQzdtNI/9gleOoUA8+jy8knnDYzjBNOZqLG2FuTdicBXblz0Mf vg41gd9kCwYXDnD91rJU8tzylXv03E75NCaTxTM+FBXPmsAVYQ4GYhhgFt8S2UWMoaaABLDe 7l5FdnLdDEcbmd8uLU2CaG4W2cLrUaI4jz2XbkcPQkqTQ3EB67hYkjiEE6Zy3ggOitiQGcqp j//OwE0EWznS4AEIAMYmP4M/V+T5RY5at/g7rUdNsLhWv1APYrh9RQefODYHrNRHUE9eosYb T6XMryR9hT8XlGOYRwKWwiQBoWSDiTMo/Xi29jUnn4BXfI2px2DTXwc22LKtLAgTRjP+qbU6 3Y0xnQN29UGDbYgyyK51DW3H0If2a3JNsheAAK+Xc9baj0LGIc8T9uiEWHBnCH+RdhgATnWW GKdDegUR5BkDfDg5O/FISymJBHx2Dyoklv5g4BzkgqTqwmaYzsl8UxZKvbaxq0zbehDda8lv hFXodNFMAgTLJlLuDYOGLK2AwbrS3Sp0AEbkpdJBb44qVlGm5bApZouHeJ/+n+7r12+lqdsA EQEAAcLAdgQYAQgAIAIbDBYhBHIX+6yM6c9jRKFo5WgNwR1TC3ojBQJftOH6AAoJEGgNwR1T C3ojVSkIALpAPkIJPQoURPb1VWjh34l0HlglmYHvZszJWTXYwavHR8+k6Baa6H7ufXNQtThR yIxJrQLW6rV5lm7TjhffEhxVCn37+cg0zZ3j7zIsSS0rx/aMwi6VhFJA5hfn3T0TtrijKP4A SAQO9xD1Zk9/61JWk8OysuIh7MXkl0fxbRKWE93XeQBhIJHQfnc+YBLprdnxR446Sh8Wn/2D Ya8cavuWf2zrB6cZurs048xe0UbSW5AOSo4V9M0jzYI4nZqTmPxYyXbm30Kvmz0rYVRaitYJ 4kyYYMhuULvrJDMjZRvaNe52tkKAvMevcGdt38H4KSVXAylqyQOW5zvPc4/sq9c= In-Reply-To: <69381d6c.050a0220.4004e.0017.GAE@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Flag: NO X-Spam-Score: -1.80 X-Spam-Level: X-Spamd-Result: default: False [-1.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=dbcb767d1e1208ac]; NEURAL_HAM_SHORT(-0.20)[-0.999]; MIME_GOOD(-0.10)[text/plain]; FUZZY_RATELIMITED(0.00)[rspamd.com]; MIME_TRACE(0.00)[0:+]; FREEMAIL_TO(0.00)[syzkaller.appspotmail.com,gmail.com,lists.freedesktop.org,vger.kernel.org,linux.intel.com,kernel.org,ffwll.ch,googlegroups.com]; ARC_NA(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_TLS_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.com:url,syzkaller.appspot.com:url,storage.googleapis.com:url,googlegroups.com:email,appspotmail.com:email,imap1.dmz-prg2.suse.org:helo,suse.de:mid,goo.gl:url]; RCPT_COUNT_SEVEN(0.00)[8]; MID_RHS_MATCH_FROM(0.00)[]; REDIRECTOR_URL(0.00)[goo.gl]; TAGGED_RCPT(0.00)[fcede535e7eb57cf5b43]; SUBJECT_HAS_QUESTION(0.00)[] Hi Am 09.12.25 um 14:00 schrieb syzbot: > Hello, > > syzbot found the following issue on: > > HEAD commit: cb015814f8b6 Merge tag 'f2fs-for-6.19-rc1' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16269a1a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=dbcb767d1e1208ac > dashboard link: https://syzkaller.appspot.com/bug?extid=fcede535e7eb57cf5b43 > compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > > 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-cb015814.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/81f7cff430d3/vmlinux-cb015814.xz > kernel image: https://storage.googleapis.com/syzbot-assets/1252ad8ea70f/bzImage-cb015814.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+fcede535e7eb57cf5b43@syzkaller.appspotmail.com There's possible fix at [1]. Any testing would be appreciated. Best regards Thomas [1] https://lore.kernel.org/dri-devel/20251209143325.102056-1-tzimmermann@suse.de/ > > ------------[ cut here ]------------ > [CRTC:37:crtc-0] vblank wait timed out > WARNING: drivers/gpu/drm/drm_atomic_helper.c:1844 at 0x0, CPU#3: kworker/3:0/34 > Modules linked in: > CPU: 3 UID: 0 PID: 34 Comm: kworker/3:0 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~bpo12+1 04/01/2014 > Workqueue: events drm_fb_helper_damage_work > RIP: 0010:drm_atomic_helper_wait_for_vblanks.part.0+0x766/0x8c0 drivers/gpu/drm/drm_atomic_helper.c:1844 > 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 3f 01 00 00 48 8d 3d f0 9b 3a 0b 8b b5 d8 00 00 00 <67> 48 0f b9 3a e9 ed fc ff ff e8 8b 66 67 fc e9 81 fe ff ff e8 b1 > RSP: 0018:ffffc900006df688 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: 1ffff11004e34023 > RDX: ffff8880264b9cc0 RSI: 0000000000000025 RDI: ffffffff909219c0 > RBP: ffff8880271a0040 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000000 R11: ffff88801e6bd4b0 R12: dffffc0000000000 > R13: ffff88802b42d300 R14: 0000000000000000 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffff8880d6c07000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f5e2cb4af98 CR3: 00000000578af000 CR4: 0000000000352ef0 > Call Trace: > > drm_atomic_helper_wait_for_vblanks drivers/gpu/drm/drm_atomic_helper.c:1818 [inline] > drm_atomic_helper_commit_tail+0xaa/0xd0 drivers/gpu/drm/drm_atomic_helper.c:1920 > commit_tail+0x334/0x410 drivers/gpu/drm/drm_atomic_helper.c:1997 > drm_atomic_helper_commit+0x300/0x380 drivers/gpu/drm/drm_atomic_helper.c:2235 > drm_atomic_commit+0x234/0x300 drivers/gpu/drm/drm_atomic.c:1743 > drm_atomic_helper_dirtyfb+0x5fd/0x780 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:346 [inline] > drm_fb_helper_damage_work+0x2a2/0x5e0 drivers/gpu/drm/drm_fb_helper.c:369 > process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 > process_scheduled_works kernel/workqueue.c:3340 [inline] > worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 > kthread+0x3c5/0x780 kernel/kthread.c:463 > ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 > > ---------------- > Code disassembly (best guess), 5 bytes skipped: > 0: df 48 89 fisttps -0x77(%rax) > 3: f9 stc > 4: 48 c1 e9 03 shr $0x3,%rcx > 8: 0f b6 04 01 movzbl (%rcx,%rax,1),%eax > c: 84 c0 test %al,%al > e: 74 08 je 0x18 > 10: 3c 03 cmp $0x3,%al > 12: 0f 8e 3f 01 00 00 jle 0x157 > 18: 48 8d 3d f0 9b 3a 0b lea 0xb3a9bf0(%rip),%rdi # 0xb3a9c0f > 1f: 8b b5 d8 00 00 00 mov 0xd8(%rbp),%esi > * 25: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction > 2a: e9 ed fc ff ff jmp 0xfffffd1c > 2f: e8 8b 66 67 fc call 0xfc6766bf > 34: e9 81 fe ff ff jmp 0xfffffeba > 39: e8 .byte 0xe8 > 3a: b1 .byte 0xb1 > > > --- > 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 -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)