Exits on connection of a client when -ncache is in use

[madduck]

Describe the bug

x11vnc exits shortly after a client connects, which only gets to briefly show the desktop. If I remove -ncache …, then the connection stays.

To Reproduce

1. Run ssh -L 5930:localhost:5900 desktop -X "pkill x11vnc && x11vnc -display :0 -nopw -localhost -ncache 10 -gone 'xscreensaver-command -lock'" on the laptop;
2. Fire up ssvnc or remmina to connect to localhost:5930;
3. Observe the desktop display for a few seconds;
4. Watch as the log says something about autorepeat, and the client is disconnected;

Log data below. I have also tried with -norepeat but it made no difference.

If I remove -ncache …, it works as expected

Expected Behavior

Well, I expect the session to prevail, and be able to use -ncache 10.

Desktop (please complete the following information):

• OS and version: Linux 5.18.0, Debian unstable
• Xorg version used: 7.7

Additional context

Here is the x11vnc output:

14/07/2022 13:05:12 Got connection from client ::1
14/07/2022 13:05:12   0 other clients
14/07/2022 13:05:12 Normal socket connection
14/07/2022 13:05:12 check_access: client addr ::1 is local.
14/07/2022 13:05:12 Disabled X server key autorepeat.
14/07/2022 13:05:12   to force back on run: 'xset r on' (3 times)
14/07/2022 13:05:12 incr accepted_client=1 for ::1:46226  sock=10
14/07/2022 13:05:12 Client Protocol Version 3.8
14/07/2022 13:05:12 Protocol version sent 3.8, using 3.8
14/07/2022 13:05:12 rfbProcessClientSecurityType: executing handler for type 1
14/07/2022 13:05:12 rfbProcessClientSecurityType: returning securityResult for client rfb version >= 3.8
14/07/2022 13:05:12 copy_tiles: allocating first_line at size 61
14/07/2022 13:05:12 Pixel format for client ::1:
14/07/2022 13:05:12   32 bpp, depth 24, little endian
14/07/2022 13:05:12   true colour: max r 255 g 255 b 255, shift r 16 g 8 b 0
14/07/2022 13:05:12 no translation needed
14/07/2022 13:05:12 Using compression level 1 for client ::1
14/07/2022 13:05:12 Enabling X-style cursor updates for client ::1
14/07/2022 13:05:12 Enabling full-color cursor updates for client ::1
14/07/2022 13:05:12 Enabling cursor position updates for client ::1
14/07/2022 13:05:12 Enabling KeyboardLedState protocol extension for client ::1
14/07/2022 13:05:12 Enabling NewFBSize protocol extension for client ::1
14/07/2022 13:05:12 Enabling SupportedMessages protocol extension for client ::1
14/07/2022 13:05:12 Enabling SupportedEncodings protocol extension for client ::1
14/07/2022 13:05:12 Enabling ServerIdentity protocol extension for client ::1
14/07/2022 13:05:12 Using zlib encoding for client ::1
14/07/2022 13:05:13 client 1 network rate 1138.8 KB/sec (149289.3 eff KB/sec)
14/07/2022 13:05:13 client 1 latency:  53.2 ms
14/07/2022 13:05:13 dt1: 0.3126, dt2: 0.3807 dt3: 0.0532 bytes: 759236
14/07/2022 13:05:13 link_rate: LR_BROADBAND - 53 ms, 1138 KB/s
14/07/2022 13:05:13 client_set_net: ::1  0.0000
14/07/2022 13:05:13 created   xdamage object: 0x400040
14/07/2022 13:05:15 Battling with something for -norepeat!! (1 resets left)
14/07/2022 13:05:15 Disabled X server key autorepeat.
14/07/2022 13:05:15   to force back on run: 'xset r on' (2 times)
14/07/2022 13:05:16 set_ncache_xrootpmap: loading background pixmap: 0x2600000
14/07/2022 13:05:17 Battling with something for -norepeat!! (0 resets left)
14/07/2022 13:05:17 Disabled X server key autorepeat.
14/07/2022 13:05:17   to force back on run: 'xset r on' (1 times)
14/07/2022 13:05:21 created selwin: 0x400041
14/07/2022 13:05:21 called initialize_xfixes()