[[6.12.3] Unknown server hangs (must be physically shut down or restarted manually)]

It happened to me a few days ago ... (unraid 6.12.3)
There was a kind of reboot at around 19h30 as you can see on this extract of the log:

Aug 10 19:10:01 hlf-data3 mergerfs[24560]: running basic garbage collection
Aug 10 19:10:01 hlf-data3 mergerfs[24579]: running basic garbage collection
Aug 10 19:10:02 hlf-data3 mergerfs[24559]: running basic garbage collection
Aug 10 19:25:01 hlf-data3 mergerfs[24560]: running basic garbage collection
Aug 10 19:25:01 hlf-data3 mergerfs[24579]: running basic garbage collection
Aug 10 19:25:02 hlf-data3 mergerfs[24559]: running basic garbage collection
Aug 10 19:31:56 hlf-data3 kernel: Linux version 6.1.38-Unraid (root@Develop-612) (gcc (GCC) 12.2.0, GNU ld version 2.40-slack151) #2 SMP PREEMPT_DYNAMIC Mon Jul 10 09:50:25 PDT 2023
Aug 10 19:31:56 hlf-data3 kernel: Command line: BOOT_IMAGE=/bzimage initrd=/bzroot
Aug 10 19:31:56 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
Aug 10 19:31:56 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Aug 10 19:31:56 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Aug 10 19:31:56 hlf-data3 kernel: x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
Aug 10 19:31:56 hlf-data3 kernel: x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'compacted' format.
Aug 10 19:31:56 hlf-data3 kernel: signal: max sigframe size: 1776
Aug 10 19:31:56 hlf-data3 kernel: BIOS-provided physical RAM map:

then there was another at 21h58 :

Aug 10 19:33:12 hlf-data3 nmbd[11175]: [2023/08/10 19:33:12.631334,  0] ../../source3/nmbd/nmbd_become_lmb.c:398(become_local_master_stage2)
Aug 10 19:33:12 hlf-data3 nmbd[11175]:   *****
Aug 10 19:33:12 hlf-data3 nmbd[11175]:   
Aug 10 19:33:12 hlf-data3 nmbd[11175]:   Samba name server HLF-DATA3 is now a local master browser for workgroup WORKGROUP on subnet 10.10.0.5
Aug 10 19:33:12 hlf-data3 nmbd[11175]:   
Aug 10 19:33:12 hlf-data3 nmbd[11175]:   *****
Aug 10 19:47:01 hlf-data3 kernel: nvidia_uvm: module uses symbols nvUvmInterfaceDisableAccessCntr from proprietary module nvidia, inheriting taint.
Aug 10 19:47:02 hlf-data3 kernel: nvidia-uvm: Loaded the UVM driver, major device number 241.
Aug 10 19:47:02 hlf-data3 kernel: NVRM: Persistence mode is deprecated and will be removed in a future release. Please use nvidia-persistenced instead.
Aug 10 21:58:49 hlf-data3 kernel: Linux version 6.1.38-Unraid (root@Develop-612) (gcc (GCC) 12.2.0, GNU ld version 2.40-slack151) #2 SMP PREEMPT_DYNAMIC Mon Jul 10 09:50:25 PDT 2023
Aug 10 21:58:49 hlf-data3 kernel: Command line: BOOT_IMAGE=/bzimage initrd=/bzroot
Aug 10 21:58:49 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x001: 'x87 floating point registers'
Aug 10 21:58:49 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x002: 'SSE registers'
Aug 10 21:58:49 hlf-data3 kernel: x86/fpu: Supporting XSAVE feature 0x004: 'AVX registers'
Aug 10 21:58:49 hlf-data3 kernel: x86/fpu: xstate_offset[2]:  576, xstate_sizes[2]:  256
Aug 10 21:58:49 hlf-data3 kernel: x86/fpu: Enabled xstate features 0x7, context size is 832 bytes, using 'compacted' format.
Aug 10 21:58:49 hlf-data3 kernel: signal: max sigframe size: 1776

 

Later on I realized that my server was unresponsive (nor web or ssh) so I had to do a hard reset.
Everything seems fine for me till then, so I consider myself lucky, but it makes me thinks that this release is not reliable.
Here is also my diagnostics file in case it can help : hlf-data3-diagnostics-20230812-2205.zip