overlayfs: overlapping lowerdir path
------------[ cut here ]------------
WARNING: CPU: 1 PID: 15430 at drivers/gpu/drm/vkms/vkms_crtc.c:100 vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:100
Modules linked in:
CPU: 1 PID: 15430 Comm: syz-executor.3 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
RIP: 0010:vkms_get_vblank_timestamp+0x185/0x1e0 drivers/gpu/drm/vkms/vkms_crtc.c:100
Code: f3 fb e8 5e 25 e1 fb 48 89 e9 48 ba 00 00 00 00 00 fc ff df 48 c1 e9 03 80 3c 11 00 75 50 48 89 45 00 eb c0 e8 8c 55 f3 fb 90 <0f> 0b 90 eb b5 e8 b1 d3 4f fc e9 dc fe ff ff 48 89 df e8 34 d4 4f
RSP: 0018:ffffc900049cef38 EFLAGS: 00010283
RAX: 00000000000107ec RBX: 000000d7eebbdca8 RCX: ffffc90011c7c000
RDX: 0000000000040000 RSI: ffffffff859bd914 RDI: 0000000000000006
RBP: ffffc900049cf0a0 R08: 0000000000000006 R09: 000000d7eebbdca8
R10: 000000d7eebbdca8 R11: 0000000000000006 R12: 000000d7eebbdca8
R13: ffff88801f960000 R14: 0000000000004e20 R15: ffffffff859bd790
FS:  00007efe4ca546c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1f94fb598c CR3: 000000002aa76000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 drm_crtc_get_last_vbltimestamp+0x106/0x1b0 drivers/gpu/drm/drm_vblank.c:880
 drm_crtc_next_vblank_start+0x184/0x300 drivers/gpu/drm/drm_vblank.c:1014
 set_fence_deadline drivers/gpu/drm/drm_atomic_helper.c:1558 [inline]
 drm_atomic_helper_wait_for_fences+0x1fc/0x840 drivers/gpu/drm/drm_atomic_helper.c:1605
 commit_tail+0x83/0x410 drivers/gpu/drm/drm_atomic_helper.c:1819
 drm_atomic_helper_commit+0x2fd/0x380 drivers/gpu/drm/drm_atomic_helper.c:2073
 drm_atomic_commit+0x22a/0x300 drivers/gpu/drm/drm_atomic.c:1514
 drm_client_modeset_commit_atomic+0x6c6/0x810 drivers/gpu/drm/drm_client_modeset.c:1063
 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1166
 pan_display_atomic drivers/gpu/drm/drm_fb_helper.c:1370 [inline]
 drm_fb_helper_pan_display+0x2a5/0x990 drivers/gpu/drm/drm_fb_helper.c:1430
 fb_pan_display+0x47a/0x7d0 drivers/video/fbdev/core/fbmem.c:191
 fb_set_var+0x865/0x11c0 drivers/video/fbdev/core/fbmem.c:323
 fbcon_resize+0x679/0x900 drivers/video/fbdev/core/fbcon.c:2049
 resize_screen drivers/tty/vt/vt.c:1112 [inline]
 vc_do_resize+0xca3/0x10b0 drivers/tty/vt/vt.c:1169
 vt_resizex drivers/tty/vt/vt_ioctl.c:717 [inline]
 vt_ioctl+0x24fc/0x2f80 drivers/tty/vt/vt_ioctl.c:937
 tty_ioctl+0x660/0x15f0 drivers/tty/tty_io.c:2803
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __x64_sys_ioctl+0x196/0x220 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efe4bc7cea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efe4ca540c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007efe4bdb4050 RCX: 00007efe4bc7cea9
RDX: 00000000200006c0 RSI: 000000000000560a RDI: 0000000000000005
RBP: 00007efe4bcebff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007efe4bdb4050 R15: 00007ffff0329c58
 </TASK>