[Bug 282156] page fault while in kernel mode after 14.0-Release to 14.1-Release upgrade

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282156

            Bug ID: 282156
           Summary: page fault while in kernel mode after 14.0-Release to
                    14.1-Release upgrade
           Product: Base System
           Version: 14.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: tfagart@brozs.net

Hello,

After a classical upgrade using freebsd-update, my two Freebsd nodes begins to
get unstable. (unwanted reboot)
I've downgrade one of them and this one is now ok in terms of stability.
For the one which is still in 14.1, i'm able to reproduce the reboot by trying
to copy small files over nfs.

Here is the output :

Hardware
CPU: AMD GX-412TC SOC
RAM : 4G

Trace
#############
Code:
Fatal trap 12: page fault while in kernel mode
cpuid = 2; apic id = 02
fault virtual address   = 0xd0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff80e1cd1b
stack pointer           = 0x28:0xfffffe0084b92a90
frame pointer           = 0x28:0xfffffe0084b92bc0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 1203 (nfscbd: master)
rdi: 0000000000000000 rsi: fffff80045961828 rdx: 0000000000000001
rcx: fffffe0084b92b00  r8: 0000000000000090  r9: 0000000031302d34
rax: 0000000000000000 rbx: fffff80129262000 rbp: fffffe0084b92bc0
r10: 0000000000000000 r11: fffffe0008b28b20 r12: fffff80045961800
r13: fffff80045961880 r14: fffff80006036000 r15: fffff80006036100
trap number             = 12
panic: page fault
cpuid = 2
time = 1720334146
KDB: stack backtrace:
#0 0xffffffff80b7fbfd at kdb_backtrace+0x5d
#1 0xffffffff80b32961 at vpanic+0x131
#2 0xffffffff80b32823 at panic+0x43
#3 0xffffffff80fff91b at trap_fatal+0x40b
#4 0xffffffff80fff966 at trap_pfault+0x46
#5 0xffffffff80fd6a48 at calltrap+0x8
#6 0xffffffff80e1c558 at svc_run+0x1a8
#7 0xffffffff809f3933 at nfscbd_nfsd+0x113
#8 0xffffffff80a1e8fd at nfssvc_nfscl+0x27d
#9 0xffffffff80d83158 at sys_nfssvc+0x98
#10 0xffffffff810001c0 at amd64_syscall+0x100
#11 0xffffffff80fd735b at fast_syscall_common+0xf8
Uptime: 9h22m40s
Dumping 947 out of 4036 MB:..2%
Dump aborted

#####
I can collect more information if needed.

Thanks for your help

Best Regards

Thomas

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