------------[ cut here ]------------ faux_driver vkms: [drm] vblank wait timed out on crtc 0 WARNING: drivers/gpu/drm/drm_vblank.c:1329 at drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331, CPU#0: kworker/0:5/4804 Modules linked in: CPU: 0 UID: 0 PID: 4804 Comm: kworker/0:5 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Workqueue: events drm_fb_helper_damage_work pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331 lr : drm_crtc_wait_one_vblank+0x408/0x440 drivers/gpu/drm/drm_vblank.c:1329 sp : ffff800096e57820 x29: ffff800096e578d0 x28: dfff800000000000 x27: ffff0000c4742080 x26: ffff800096e57820 x25: dfff800000000000 x24: ffff700012dcaf04 x23: ffff800086f48260 x22: ffff0000c62cb000 x21: ffff800086fcda40 x20: ffff0000c6268000 x19: 0000000000000000 x18: 1fffe00034bb7428 x17: 0000000000000003 x16: ffff800088b27000 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000002 x9 : 8d2181912a924a00 x8 : 8d2181912a924a00 x7 : ffff80008048e8f8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6268000 Call trace: drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331 (P) drm_client_modeset_wait_for_vblank+0xc4/0xec drivers/gpu/drm/drm_client_modeset.c:1331 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:327 [inline] drm_fb_helper_damage_work+0x520/0xbc0 drivers/gpu/drm/drm_fb_helper.c:365 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 irq event stamp: 60092 hardirqs last enabled at (60091): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (60091): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (60092): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (58964): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (58964): [] get_next_corpse net/netfilter/nf_conntrack_core.c:2345 [inline] softirqs last enabled at (58964): [] nf_ct_iterate_cleanup+0x3e8/0x480 net/netfilter/nf_conntrack_core.c:2366 softirqs last disabled at (58962): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (58962): [] get_next_corpse net/netfilter/nf_conntrack_core.c:2319 [inline] softirqs last disabled at (58962): [] nf_ct_iterate_cleanup+0xdc/0x480 net/netfilter/nf_conntrack_core.c:2366 ---[ end trace 0000000000000000 ]--- ------------[ cut here ]------------ faux_driver vkms: [drm] vblank wait timed out on crtc 0 WARNING: drivers/gpu/drm/drm_vblank.c:1329 at drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331, CPU#0: kworker/0:5/4804 Modules linked in: CPU: 0 UID: 0 PID: 4804 Comm: kworker/0:5 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026 Workqueue: events drm_fb_helper_damage_work pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331 lr : drm_crtc_wait_one_vblank+0x408/0x440 drivers/gpu/drm/drm_vblank.c:1329 sp : ffff800096e57820 x29: ffff800096e578d0 x28: dfff800000000000 x27: ffff0000c4742080 x26: ffff800096e57820 x25: dfff800000000000 x24: ffff700012dcaf04 x23: ffff800086f48260 x22: ffff0000c62cb000 x21: ffff800086fcda40 x20: ffff0000c6268000 x19: 0000000000000000 x18: 1fffe00034bb7428 x17: 0000000000000003 x16: ffff800088b27000 x15: ffff800088bdd260 x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000002 x9 : 8d2181912a924a00 x8 : 8d2181912a924a00 x7 : ffff80008048e8f8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6268000 Call trace: drm_crtc_wait_one_vblank+0x410/0x440 drivers/gpu/drm/drm_vblank.c:1331 (P) drm_client_modeset_wait_for_vblank+0xc4/0xec drivers/gpu/drm/drm_client_modeset.c:1331 drm_fb_helper_fb_dirty drivers/gpu/drm/drm_fb_helper.c:327 [inline] drm_fb_helper_damage_work+0x520/0xbc0 drivers/gpu/drm/drm_fb_helper.c:365 process_one_work kernel/workqueue.c:3322 [inline] process_scheduled_works+0x788/0x10b8 kernel/workqueue.c:3405 worker_thread+0x798/0xbd0 kernel/workqueue.c:3486 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:838 irq event stamp: 60358 hardirqs last enabled at (60357): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (60357): [] arm64_exit_to_kernel_mode+0x80/0x94 arch/arm64/kernel/entry-common.c:62 hardirqs last disabled at (60358): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:425 softirqs last enabled at (60266): [] softirq_handle_end kernel/softirq.c:468 [inline] softirqs last enabled at (60266): [] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650 softirqs last disabled at (60095): [] __do_softirq+0x14/0x20 kernel/softirq.c:656 ---[ end trace 0000000000000000 ]---