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Message-ID: <337993e9-2f99-42ad-97c0-3a4a5a4de972@suse.de> Date: Tue, 9 Dec 2025 15:35:51 +0100 From: Thomas Zimmermann <tzimmermann@...e.de> To: syzbot <syzbot+fcede535e7eb57cf5b43@...kaller.appspotmail.com>, airlied@...il.com, dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com, mripard@...nel.org, simona@...ll.ch, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [dri?] WARNING in drm_atomic_helper_wait_for_vblanks (5) 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@...kaller.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: > <TASK> > 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 > </TASK> > ---------------- > 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@...glegroups.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)
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