Panic in fbt_provide_module_function() on head amd64 r347403

[Mark Johnston]

On Fri, May 10, 2019 at 08:07:46AM +0200, Trond Endrestøl wrote:
> On Thu, 9 May 2019 17:23-0500, Larry Rosenman wrote:
> 
> > On 05/09/2019 5:19 pm, Trond Endrestøl wrote:
> > > Host is Windows 7 x64 SP1.
> > > CPU is Core i7 960.
> > > Hypervisor is VirtualBox 6.0.6.
> > > VM is using UEFI.
> > > Kernel config is
> > > https://ximalas.info/~trond/create-zfs/canmount/VBOXGUEST-amd64-head
> > > 
> > > Crash happens early during boot, right after launching the APs.
> > > 
> > > fault virtual address   = 0x0
> > > [...]
> > > KDB backtrace:
> > > db_trace_self_wrapper() at
> > > vpanic() at
> > > panic() at
> > > trap_fatal() at
> > > trap_pfault() at
> > > trap() at
> > > calltrap() at
> > > -- trap 0xc, rip = 0xffffffff8196d63a, rsp = 0xffffffff8198d730, rbp =
> > > 0xffffffff8198d790 ---
> > > fbt_provide_module_function() at 0xffffffff8196d63a =
> > > fbt_provide_module_function+0x7a/frame 0xffffffff8198d790
> > > link_elf_each_function_nameval() at 0xffffffff80822ae5 =
> > > link_elf_each_function_nameval+0x115/frame 0xffffffff8198d7e0
> > > fbt_provide_module() at 0xffffffff8196c33e =
> > > fbt_provide_module+0xde/frame 0xffffffff8198dc10
> > > fbt_linker_file_cb() at 0xffffffff8196c242 =
> > > fbt_linker_file_cb+0x12/frame 0xffffffff8198dc20
> > > linker_file_foreach() at 0xffffffff807c47b7 =
> > > linker_file_foreach+0x67/frame 0xffffffff8198dc60
> > > mi_startup() at 0xffffffff80786de6 = mi_startup+0x216/frame
> > > 0xffffffff8198dcb0
> > > btext() at 0xffffffff8030da2c = btext+0x2c
> > > Uptime: 1s
> > > 
> > > Previous BE is r346969 and works flawlessly.
> > > No dumpdev is enabled to capture the details this early during boot.
> > > Suggestions are welcome.
> > 
> > There is a patch:
> > From: markj at FreeBSD.org (on my Crash loading dtraceall thread):
> > 
> > 
> > I see, my theory above is not the real problem here.  The resolver for
> > x86_rng_store() may return NULL, which we do not expect.  Can you show
> > the CPU info and features lines from the dmesg to confirm?
> 
> CPU: Intel(R) Core(TM) i7 CPU         960  @ 3.20GHz (3207.36-MHz K8-class CPU)
>   Origin="GenuineIntel"  Id=0x196a5  Family=0x6  Model=0x1a  Stepping=5
>   Features=0x1783fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,HTT>
>   Features=0x180201<SSE3,SSSE3,SSE4.1,SSE4.2>
>   AMD Features=0x28100800<SYSCALL,NX,RDTSCP,LM>
>   AMD Features2=0x1<LAHF>
>   TSC: P-state invariant
> 
> I'll try the patch below when I get home.
> Thanks.

The problem should be fixed by head r347423.