System hang on shutdown when running freebsd-update

[Colin Perkins]

On 14 Oct 2014, at 18:09, Kevin Oberman <rkoberman at gmail.com> wrote:
> I thought that this was just a fluke, but it has now happened three times,
> so I guess it's now out of the "fluke" class.
> 
> I have upgraded several times recently to each 10.1 BETA and RC. After the
> first install pass t install the kernel and modules, the system shutdown
> freezes at the very end. I see the buffers synced to the disks and get the
> "All buffers synced" message. Then it just hangs. The disks are not marked
> as clean and are fscked after a reset and boot.
> 
> There is not much between the "All buffers synced" message and the call to
> vfs_unmountall(), so I suspect it is hanging in that call. I admit that I
> am pretty much lost whenever I look at the VFS code and I have not put a
> lot of effort going further. Just hoping that someone familiar with it
> might have an idea.
> 
> I have tried several reboots and all run normally. The problem only seems
> to appear when upgrading the OS. It happened repeatedly when I tried to
> reboot before doing the second "install" pass of freebsd-update, but not
> after, so the kernel and world are not in sync. I am baffled as to what
> could be going on, but it means I need to be at the system (a baby server)
> when I upgrade, but not every time I upgrade. I know it happened on the
> 10.0-RELEAASE to 10.1-BETA1 and 10.1-RC1 to 10.1-RC2 upgrades.
> 
> Has anyone else seen this?

I’m seeing the same behaviour, most recently when moving to 10.1-RC1 (haven’t gone to -RC2 yet). The system is:

FreeBSD 10.1-RC1 #0 r272463: Fri Oct  3 01:47:10 UTC 2014
root at releng1.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC amd64
FreeBSD clang version 3.4.1 (tags/RELEASE_34/dot1-final 208032) 20140512
CPU: AMD Opteron(TM) Processor 6274                  (2200.05-MHz K8-class CPU)
Origin = "AuthenticAMD"  Id = 0x600f12  Family = 0x15  Model = 0x1  Stepping = 2
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,HTT>
Features2=0x1e98220b<SSE3,PCLMULQDQ,MON,SSSE3,CX16,SSE4.1,SSE4.2,POPCNT,AESNI,XSAVE,OSXSAVE,AVX>
AMD Features=0x2e500800<SYSCALL,NX,MMX+,FFXSR,Page1GB,RDTSCP,LM>
AMD Features2=0x1c9bfff<LAHF,CMP,SVM,ExtAPIC,CR8,ABM,SSE4A,MAS,Prefetch,OSVW,IBS,XOP,SKINIT,WDT,LWP,FMA4,NodeId,Topology,PCXC,PNXC>
TSC: P-state invariant, performance statistics
real memory  = 549755813888 (524288 MB)
avail memory = 534559084544 (509795 MB)
Event timer "LAPIC" quality 400
ACPI APIC Table: <041112 APIC1739>
FreeBSD/SMP: Multiprocessor System Detected: 64 CPUs
FreeBSD/SMP: 4 package(s) x 16 core(s)
…

I do have IPMI loaded, unlike the other reports.

-- 
Colin Perkins
https://csperkins.org/