Re: Recent current panic

On Tue, Jul 7, 2026 at 12:17 PM Alan Somers <asomers@freebsd.org> wrote:

> On Tue, Jul 7, 2026 at 11:24 AM Guido Falsi <mad@madpilot.net> wrote:
> >
> > Hi!
> >
> > I'm experiencing a fully reproducible panic on recent current. I'm not
> > sure what is triggering it, looks ZFS related but I could be wrong. It
> > started when I updated shortly after the latest ZFS import.
> >
> > I'm running 2de20c5c77cf8d5b2059054cff0e0c1fc124739d committed on  Fri
> > Jul 3 10:55:37 2026 -0800 (from the commit message timestamp).
> >
> > first just after booting I get this report on the console:
> >
> > EFI RT fault page fault
> >
> > EFI runtime trap 12: page fault while in kernel mode
> > cpuid = 5; apic id = 05
> > fault virtual address   = 0x0
> > fault code              = supervisor read data, page not present
> > instruction pointer     = 0x20:0xb8bc1c5f
> > stack pointer           = 0x28:0xfffffe0121ae6c20
> > frame pointer           = 0x28:0x1
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current thread          = 0/100045 (kernel/thread taskq)
> > rdi: fffffe0121ae6ce0 rsi: fffff80002523cd0 rdx: 0000000000000000
> > rcx: 00000000b8bc31b8  r8: 00000000b8bc3448  r9: 0000000000000006
> > rax: 00000000b9254e70 rbx: fffffe0121ae6d98 rbp: 0000000000000001
> > r10: 0000000000000000 r11: 0000000000000006 r12: fffff800014df658
> > r13: 0000000000000000 r14: fffffe0121ae6e08 r15: fffffe0121ae6da8
> >
> >
> > The system works fine after this, except if I start building a nanobsd
> > image with scripts that have worked fine till now. Then when it tries to
> > install packages in the image jail system panics hard:
> >
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 1; apic id = 01
> > fault virtual address   = 0x180
> > fault code              = supervisor read data, page not present
> > instruction pointer     = 0x20:0xffffffff807a74e5
> > stack pointer           = 0x28:0xfffffe016f8ef9e0
> > frame pointer           = 0x28:0xfffffe016f8efd70
> > processor eflags        = interrupt enabled, resume, IOPL = 0
> > current thread          = 15751/101480 (sh/sh)
> > rdi: fffffe016369e984 rsi: fffff80035ad3000 rdx: 0000000000000000
> > rcx: 0000000000000000  r8: 0000000000006873  r9: 00000000ffffff01
> > rax: 0000000000000000 rbx: fffffe016369e984 rbp: fffffe016f8efd70
> > r10: 0000000000000001 r11: 0000000000000001 r12: fffffe016369e5a0
> > r13: 0000000000000000 r14: 0000000000000000 r15: 0000000000000000
> > panic: page fault
> > cpuid = 1
> > time = 1783444123
> > KDB: stack backtrace:
> > db_trace_self_wrapper() at db_trace_self_wrapper+0x36/frame
> > 0xfffffe016f8ef720
> > vpanic() at vpanic+0x149/frame 0xfffffe016f8ef850
> > panic() at panic+0x43/frame 0xfffffe016f8ef8b0
> > trap_pfault() at trap_pfault+0x3a8/frame 0xfffffe016f8ef910
> > calltrap() at calltrap+0x8/frame 0xfffffe016f8ef910
> > --- trap 0xc, rip = 0xffffffff807a74e5, rsp = 0xfffffe016f8ef9e0, rbp =
> > 0xfffffe016f8efd70 ---
> > kern_execve() at kern_execve+0x17f5/frame 0xfffffe016f8efd70
> > sys_execve() at sys_execve+0xc2/frame 0xfffffe016f8efe00
> > amd64_syscall() at amd64_syscall+0x133/frame 0xfffffe016f8eff30
> > fast_syscall_common() at fast_syscall_common+0xf8/frame
> 0xfffffe016f8eff30
> > --- syscall (59, FreeBSD ELF64, execve), rip = 0x605cefca, rsp =
> > 0x881310ee8, rbp = 0x881311360 ---
> > KDB: enter: panic
> >
> >
> > Anyone can help I can trigger this easily. If someone could give me some
> > steps to perform in the debugger to extract more information I can do
> that.
> >
> >
> > Thanks in advance.
> >
> > --
> > Guido Falsi <mad@madpilot.net>
>
> That "EFI RT page fault" message looks very concerning. How confident
> are you in your system's RAM?  Have you tried something like
> memtest86+ ?
>

It could also be from the runtime services from EFI that we're calling back
into
as well... Best to check into both.

Warner