------------[ cut here ]------------ faux_driver vkms: [drm] vblank wait timed out on crtc 0 WARNING: drivers/gpu/drm/drm_vblank.c:1320 at drm_crtc_wait_one_vblank+0x2fd/0x500 drivers/gpu/drm/drm_vblank.c:1320, CPU#0: kworker/0:2/790 Modules linked in: CPU: 0 UID: 0 PID: 790 Comm: kworker/0:2 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Workqueue: events drm_fb_helper_damage_work RIP: 0010:drm_crtc_wait_one_vblank+0x303/0x500 drivers/gpu/drm/drm_vblank.c:1320 Code: 48 8b 6b 50 48 85 ed 0f 84 96 01 00 00 e8 35 b0 73 fc 48 89 df e8 8d ba 8f 00 48 89 c6 48 8d 3d 23 9f 4f 0b 44 89 e9 48 89 ea <67> 48 0f b9 3a 44 89 ee 4c 89 e7 41 be 92 ff ff ff e8 17 f8 ff ff RSP: 0018:ffffc90003667a78 EFLAGS: 00010293 RAX: ffffffff8c4c6160 RBX: ffff888026ddd000 RCX: 0000000000000000 RDX: ffffffff8c4a4e00 RSI: ffffffff8c4c6160 RDI: ffffffff90e30d40 RBP: ffffffff8c4a4e00 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888026e48000 R13: 0000000000000000 R14: 0000000000000000 R15: 000000003929f487 FS: 0000000000000000(0000) GS:ffff8881243a8000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3e62dd CR3: 000000000e596000 CR4: 00000000003526f0 Call Trace: drm_client_modeset_wait_for_vblank+0xef/0x120 drivers/gpu/drm/drm_client_modeset.c:1330 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:236 [inline] drm_fb_helper_damage_work+0x164/0x640 drivers/gpu/drm/drm_fb_helper.c:274 process_one_work+0x9c2/0x1840 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3439 kthread+0x370/0x450 kernel/kthread.c:467 ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 48 8b 6b 50 mov 0x50(%rbx),%rbp 4: 48 85 ed test %rbp,%rbp 7: 0f 84 96 01 00 00 je 0x1a3 d: e8 35 b0 73 fc call 0xfc73b047 12: 48 89 df mov %rbx,%rdi 15: e8 8d ba 8f 00 call 0x8fbaa7 1a: 48 89 c6 mov %rax,%rsi 1d: 48 8d 3d 23 9f 4f 0b lea 0xb4f9f23(%rip),%rdi # 0xb4f9f47 24: 44 89 e9 mov %r13d,%ecx 27: 48 89 ea mov %rbp,%rdx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: 44 89 ee mov %r13d,%esi 32: 4c 89 e7 mov %r12,%rdi 35: 41 be 92 ff ff ff mov $0xffffff92,%r14d 3b: e8 17 f8 ff ff call 0xfffff857