Looks like the error starts here :
Sep 7 06:29:09 Apollo unraid-api[5054]: ⚠️ Caught exception: Maximum call stack size exceeded
Sep 7 06:29:09 Apollo unraid-api[5054]: ⚠️ UNRAID API crashed with exit code 1
Sep 7 06:40:53 Apollo nginx: 2022/09/07 06:40:53 [crit] 5329#5329: *407337 pwritev() "/var/lib/nginx/client_body/0000049031" has written only 4096 of 9051, client: unix:, server: , request: "POST /pub/disks?buffer_length=1 HTTP/1.1", host: "localhost"
Sep 7 06:43:37 Apollo nmbd[23864]: [2022/09/07 06:43:37.650269, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 06:43:37 Apollo nmbd[23864]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 06:46:29 Apollo kernel: TCP: request_sock_TCP: Possible SYN flooding on port 32611. Sending cookies. Check SNMP counters.
Sep 7 06:48:02 Apollo unraid-api[32346]: ✔️ UNRAID API started successfully!
Sep 7 06:48:07 Apollo unraid-api[32346]: ⚠️ Caught exception: Maximum call stack size exceeded
Sep 7 06:48:07 Apollo unraid-api[32346]: ⚠️ UNRAID API crashed with exit code 1
Sep 7 06:58:05 Apollo unraid-api[20466]: ✔️ UNRAID API started successfully!
Sep 7 06:58:15 Apollo unraid-api[20466]: ⚠️ Caught exception: Maximum call stack size exceeded
Sep 7 06:58:15 Apollo unraid-api[20466]: ⚠️ UNRAID API crashed with exit code 1
Sep 7 06:58:37 Apollo nmbd[23214]: [2022/09/07 06:58:37.656692, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 06:58:37 Apollo nmbd[23214]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:13:37 Apollo nmbd[18929]: [2022/09/07 07:13:37.660920, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:13:37 Apollo nmbd[18929]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:18:09 Apollo unraid-api[27759]: ✔️ UNRAID API started successfully!
Sep 7 07:18:12 Apollo unraid-api[27759]: ⚠️ Caught exception: Maximum call stack size exceeded
Sep 7 07:18:12 Apollo unraid-api[27759]: ⚠️ UNRAID API crashed with exit code 1
Sep 7 07:28:37 Apollo nmbd[15440]: [2022/09/07 07:28:37.667499, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:28:37 Apollo nmbd[15440]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:28:42 Apollo smbd[15577]: [2022/09/07 07:28:42.980566, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:28:42 Apollo smbd[15577]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:43:37 Apollo winbindd[8829]: [2022/09/07 07:43:37.655531, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:43:37 Apollo winbindd[8829]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:43:37 Apollo nmbd[8830]: [2022/09/07 07:43:37.670856, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:43:37 Apollo nmbd[8830]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:43:43 Apollo smbd[8972]: [2022/09/07 07:43:43.084651, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 07:43:43 Apollo smbd[8972]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 07:59:35 Apollo nginx: 2022/09/07 07:59:35 [crit] 5329#5329: *450673 pwritev() "/var/lib/nginx/client_body/0000049032" failed (28: No space left on device), client: unix:, server: , request: "POST /pub/disks?buffer_length=1 HTTP/1.1", host: "localhost"
Sep 7 08:09:46 Apollo unraid-api[21794]: ✔️ UNRAID API started successfully!
Sep 7 08:11:45 Apollo unraid-api[21794]: ⚠️ Caught exception: Maximum call stack size exceeded
Sep 7 08:11:45 Apollo unraid-api[21794]: ⚠️ UNRAID API crashed with exit code 1
Sep 7 08:28:37 Apollo winbindd[25498]: [2022/09/07 08:28:37.669425, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:28:37 Apollo winbindd[25498]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:28:37 Apollo nmbd[25499]: [2022/09/07 08:28:37.700896, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:28:37 Apollo nmbd[25499]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:43:37 Apollo winbindd[17959]: [2022/09/07 08:43:37.674478, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:43:37 Apollo winbindd[17959]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:43:37 Apollo nmbd[17960]: [2022/09/07 08:43:37.709682, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:43:37 Apollo nmbd[17960]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:43:43 Apollo smbd[18115]: [2022/09/07 08:43:43.459556, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:43:43 Apollo smbd[18115]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:58:37 Apollo winbindd[11312]: [2022/09/07 08:58:37.678150, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:58:37 Apollo winbindd[11312]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 08:58:37 Apollo nmbd[11313]: [2022/09/07 08:58:37.721422, 0] ../../source3/lib/util.c:482(reinit_after_fork)
Sep 7 08:58:37 Apollo nmbd[11313]: messaging_reinit() failed: NT_STATUS_DISK_FULL
Sep 7 09:10:07 Apollo root: error: /webGui/include/Notify.php: uninitialized csrf_token
Sep 7 09:10:07 Apollo root: error: /plugins/community.applications/scripts/notices.php: uninitialized csrf_token
Sep 7 09:10:07 Apollo root: error: /webGui/include/Report.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo unassigned.devices: PHP Warning: syntax error, unexpected end of file, expecting TC_DOLLAR_CURLY or TC_QUOTED_STRING or ''' in /usr/local/emhttp/state/disks.ini on line 270 in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 49
Sep 7 09:10:15 Apollo unassigned.devices: PHP Warning: Invalid argument supplied for foreach() in /usr/local/emhttp/plugins/dynamix/include/DefaultPageLayout.php(528) : eval()'d code on line 21
Sep 7 09:10:15 Apollo root: error: /webGui/include/Notify.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo root: error: /webGui/include/Report.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo root: error: /plugins/community.applications/scripts/notices.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo root: error: /plugins/dynamix.plugin.manager/scripts/PluginAPI.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo root: error: /plugins/unassigned.devices/UnassignedDevices.php: uninitialized csrf_token
Sep 7 09:10:15 Apollo root: error: /plugins/unassigned.devices/UnassignedDevices.php: uninitialized csrf_token
Sep 7 09:10:18 Apollo root: error: /plugins/unassigned.devices/UnassignedDevices.php: wrong csrf_token
Sep 7 09:10:21 Apollo root: error: /webGui/include/Report.php: uninitialized csrf_token
Sep 7 09:10:21 Apollo root: error: /plugins/unassigned.devices/UnassignedDevices.php: uninitialized csrf_token
Sep 7 09:10:22 Apollo unassigned.devices: PHP Warning: file_put_contents(): Only -1 of 114 bytes written, possibly out of free disk space in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 92
Sep 7 09:10:22 Apollo unassigned.devices: PHP Warning: file_put_contents(): Only -1 of 2420 bytes written, possibly out of free disk space in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 210
Sep 7 09:10:22 Apollo unassigned.devices: PHP Warning: file_put_contents(): Only -1 of 114 bytes written, possibly out of free disk space in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 92
Sep 7 09:10:22 Apollo unassigned.devices: PHP Warning: file_put_contents(): Only -1 of 2225 bytes written, possibly out of free disk space in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 210
Sep 7 09:10:23 Apollo unassigned.devices: PHP Warning: file_put_contents(): Only -1 of 114 bytes written, possibly out of free disk space in /usr/local/emhttp/plugins/unassigned.devices/include/lib.php on line 92
and then the php errors from UD continue. They might be the consequence of the previous errors, not the cause ?