------------[ 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#1: kworker/1:1/26 Modules linked in: CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Not tainted syzkaller #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 : ffff80008ecb7820 x29: ffff80008ecb78d0 x28: dfff800000000000 x27: ffff0000c672b880 x26: ffff80008ecb7820 x25: dfff800000000000 x24: ffff700011d96f04 x23: ffff800086eb9ea0 x22: ffff0000c6636000 x21: ffff800086f411e0 x20: ffff0000c6720000 x19: 0000000000000000 x18: 1fffe00035bde028 x17: 0000000000000003 x16: ffff800088a57000 x15: ffff800088b077e0 x14: 0000000000000fab x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000002 x9 : 90115d7a4bea2900 x8 : 90115d7a4bea2900 x7 : ffff8000804823d8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e90 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6720000 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:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 121348 hardirqs last enabled at (121347): [] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385 hardirqs last disabled at (121348): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (120720): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (120720): [] rcu_read_unlock_bh include/linux/rcupdate.h:923 [inline] softirqs last enabled at (120720): [] keep_key_fresh drivers/net/wireguard/send.c:135 [inline] softirqs last enabled at (120720): [] wg_packet_create_data_done drivers/net/wireguard/send.c:259 [inline] softirqs last enabled at (120720): [] wg_packet_tx_worker+0x518/0x75c drivers/net/wireguard/send.c:276 softirqs last disabled at (120718): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (120718): [] rcu_read_lock_bh include/linux/rcupdate.h:902 [inline] softirqs last disabled at (120718): [] keep_key_fresh drivers/net/wireguard/send.c:129 [inline] softirqs last disabled at (120718): [] wg_packet_create_data_done drivers/net/wireguard/send.c:259 [inline] softirqs last disabled at (120718): [] wg_packet_tx_worker+0x210/0x75c drivers/net/wireguard/send.c:276 ---[ 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#1: kworker/1:1/26 Modules linked in: CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 : ffff80008ecb7820 x29: ffff80008ecb78d0 x28: dfff800000000000 x27: ffff0000c672b880 x26: ffff80008ecb7820 x25: dfff800000000000 x24: ffff700011d96f04 x23: ffff800086eb9ea0 x22: ffff0000c6636000 x21: ffff800086f411e0 x20: ffff0000c6720000 x19: 0000000000000000 x18: 1fffe00035bde028 x17: 0000000000000003 x16: ffff800088a57000 x15: ffff800088b077e0 x14: 0000000000000ff0 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000002 x9 : 90115d7a4bea2900 x8 : 90115d7a4bea2900 x7 : ffff8000804823d8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e90 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6720000 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:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 121458 hardirqs last enabled at (121457): [] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385 hardirqs last disabled at (121458): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (121412): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (121412): [] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673 softirqs last disabled at (121351): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ 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#1: kworker/1:1/26 Modules linked in: CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 : ffff80008ecb7820 x29: ffff80008ecb78d0 x28: dfff800000000000 x27: ffff0000c672b880 x26: ffff80008ecb7820 x25: dfff800000000000 x24: ffff700011d96f04 x23: ffff800086eb9ea0 x22: ffff0000c6636000 x21: ffff800086f411e0 x20: ffff0000c6720000 x19: 0000000000000000 x18: 1fffe00035bde028 x17: 0000000000000003 x16: ffff800088a57000 x15: ffff800088b077e0 x14: 0000000000001036 x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000002 x9 : 90115d7a4bea2900 x8 : 90115d7a4bea2900 x7 : ffff8000804823d8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e90 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6720000 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:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 121558 hardirqs last enabled at (121557): [] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385 hardirqs last disabled at (121558): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (121512): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (121512): [] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673 softirqs last disabled at (121461): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ 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#1: kworker/1:1/26 Modules linked in: CPU: 1 UID: 0 PID: 26 Comm: kworker/1:1 Tainted: G W syzkaller #0 PREEMPT Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 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 : ffff80008ecb7820 x29: ffff80008ecb78d0 x28: dfff800000000000 x27: ffff0000c672b880 x26: ffff80008ecb7820 x25: dfff800000000000 x24: ffff700011d96f04 x23: ffff800086eb9ea0 x22: ffff0000c6636000 x21: ffff800086f411e0 x20: ffff0000c6720000 x19: 0000000000000000 x18: 1fffe00035bde028 x17: 0000000000000003 x16: ffff800088a57000 x15: ffff800088b077e0 x14: 000000000000107c x13: 0000000000000001 x12: 0000000000000003 x11: 0000000000000000 x10: 0000000000000002 x9 : 90115d7a4bea2900 x8 : 90115d7a4bea2900 x7 : ffff8000804823d8 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f3e90 x2 : 0000000100000000 x1 : 0000000000000000 x0 : ffff0000c6720000 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:3396 [inline] process_scheduled_works+0x91c/0x1250 kernel/workqueue.c:3479 worker_thread+0x798/0xbd0 kernel/workqueue.c:3560 kthread+0x304/0x3d4 kernel/kthread.c:436 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 irq event stamp: 121668 hardirqs last enabled at (121667): [] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385 hardirqs last disabled at (121668): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (121622): [] softirq_handle_end kernel/softirq.c:491 [inline] softirqs last enabled at (121622): [] handle_softirqs+0xb2c/0xcbc kernel/softirq.c:673 softirqs last disabled at (121561): [] __do_softirq+0x14/0x20 kernel/softirq.c:679 ---[ end trace 0000000000000000 ]---