------------[ cut here ]------------
WARNING: CPU: 0 PID: 12720 at drivers/gpu/drm/vkms/vkms_crtc.c:103 vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:116
Modules linked in:
CPU: 0 PID: 12720 Comm: syz-executor.0 Not tainted 6.3.0-syzkaller-07919-g6e98b09da931 #0
Hardware name: linux,dummy-virt (DT)
pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:103
lr : drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:877
sp : ffff800011d67380
x29: ffff800011d67380 x28: 0000000000000003 x27: ffff00000fd84dc0
x26: 0000000000000000 x25: 0000000000000001 x24: ffff00000fd84dc0
x23: ffff80000cf7c5e0 x22: 000002f35a24d500 x21: ffff800011d67550
x20: ffff00000b0cf880 x19: ffff00000fd84dc0 x18: 0000000000000000
x17: 0048000000000326 x16: 0309030303260300 x15: 1ffff000023ace22
x14: 00000000f1f1f1f1 x13: 0000000000000007 x12: ffff7000023ace6f
x11: 1ffff000023ace6e x10: ffff7000023ace6e x9 : dfff800000000000
x8 : 0000000041b58ab3 x7 : ffff7000023ace80 x6 : dfff800000000000
x5 : 0000000000000000 x4 : ffff800009a02b98 x3 : 1fffe00001619f49
x2 : 1fffe00001619f35 x1 : 0000000000000000 x0 : 000002f35a24d500
Call trace:
 vkms_get_vblank_timestamp+0x188/0x1e4 drivers/gpu/drm/vkms/vkms_crtc.c:116
 drm_crtc_get_last_vbltimestamp+0x140/0x184 drivers/gpu/drm/drm_vblank.c:877
 drm_crtc_next_vblank_start+0x11c/0x244 drivers/gpu/drm/drm_vblank.c:1012
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1537 [inline]
 drm_atomic_helper_wait_for_fences+0x17c/0x610 drivers/gpu/drm/drm_atomic_helper.c:1584
 drm_atomic_helper_commit drivers/gpu/drm/drm_atomic_helper.c:2013 [inline]
 drm_atomic_helper_commit+0x170/0x2c0 drivers/gpu/drm/drm_atomic_helper.c:1985
 drm_atomic_commit+0x1b0/0x290 drivers/gpu/drm/drm_atomic.c:1503
 drm_client_modeset_commit_atomic+0x48c/0x5e8 drivers/gpu/drm/drm_client_modeset.c:1045
 drm_client_modeset_dpms+0x120/0x19c drivers/gpu/drm/drm_client_modeset.c:1226
 drm_fb_helper_dpms drivers/gpu/drm/drm_fb_helper.c:323 [inline]
 drm_fb_helper_blank+0x108/0x1f8 drivers/gpu/drm/drm_fb_helper.c:356
 fb_blank+0xcc/0x144 drivers/video/fbdev/core/fbmem.c:1088
 do_fb_ioctl+0x21c/0xae8 drivers/video/fbdev/core/fbmem.c:1180
 fb_compat_ioctl+0x754/0xbcc drivers/video/fbdev/core/fbmem.c:1328
 __do_compat_sys_ioctl fs/ioctl.c:968 [inline]
 __se_compat_sys_ioctl fs/ioctl.c:910 [inline]
 __arm64_compat_sys_ioctl+0x1d0/0x21c fs/ioctl.c:910
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x6c/0x260 arch/arm64/kernel/syscall.c:52
 el0_svc_common.constprop.0+0xc4/0x254 arch/arm64/kernel/syscall.c:142
 do_el0_svc_compat+0x40/0x70 arch/arm64/kernel/syscall.c:199
 el0_svc_compat+0x4c/0x130 arch/arm64/kernel/entry-common.c:773
 el0t_32_sync_handler+0x90/0x140 arch/arm64/kernel/entry-common.c:783
 el0t_32_sync+0x194/0x198 arch/arm64/kernel/entry.S:596
irq event stamp: 398
hardirqs last  enabled at (397): [<ffff80000cae6698>] __exit_to_kernel_mode arch/arm64/kernel/entry-common.c:84 [inline]
hardirqs last  enabled at (397): [<ffff80000cae6698>] exit_to_kernel_mode+0x38/0x118 arch/arm64/kernel/entry-common.c:94
hardirqs last disabled at (398): [<ffff80000cae7ad8>] el1_dbg+0x24/0x9c arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (280): [<ffff80000801d994>] fpsimd_restore_current_state+0x3c/0x10c arch/arm64/kernel/fpsimd.c:1785
softirqs last disabled at (278): [<ffff80000801a1f8>] generic_test_bit include/asm-generic/bitops/generic-non-atomic.h:128 [inline]
softirqs last disabled at (278): [<ffff80000801a1f8>] cpus_have_cap arch/arm64/include/asm/cpufeature.h:452 [inline]
softirqs last disabled at (278): [<ffff80000801a1f8>] cpus_have_const_cap arch/arm64/include/asm/cpufeature.h:504 [inline]
softirqs last disabled at (278): [<ffff80000801a1f8>] system_supports_fpsimd arch/arm64/include/asm/cpufeature.h:745 [inline]
softirqs last disabled at (278): [<ffff80000801a1f8>] get_cpu_fpsimd_context+0x0/0xa0 arch/arm64/kernel/fpsimd.c:1929
---[ end trace 0000000000000000 ]---