[Bug 263445] Fatal trap 12: page fault while in kernel mode // supervisor read data, page not present // 13.1-RC3

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 21 Apr 2022 11:12:08 UTC

            Bug ID: 263445
           Summary: Fatal trap 12: page fault while in kernel mode //
                    supervisor read data, page not present // 13.1-RC3
           Product: Base System
           Version: 13.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: viaprog@gmail.com

# kgdb -c vmcore.0 /boot/kernel/kernel   
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Reading symbols from /boot/kernel/kernel...
Reading symbols from /usr/lib/debug//boot/kernel/kernel.debug...

Unread portion of the kernel message buffer:

Fatal trap 12: page fault while in kernel mode
cpuid = 4; apic id = 24
fault virtual address   = 0x18
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0xffffffff806bb6dd
stack pointer           = 0x28:0xfffffe0295a174b0
frame pointer           = 0x28:0xfffffe0295a17520
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         = 0 (if_io_tqg_4)
trap number             = 12
panic: page fault
cpuid = 4
time = 1650132610
KDB: stack backtrace:
#0 0xffffffff80676825 at kdb_backtrace+0x65
#1 0xffffffff806292df at vpanic+0x17f
#2 0xffffffff80629153 at panic+0x43
#3 0xffffffff809758e5 at trap_fatal+0x385
#4 0xffffffff8097593f at trap_pfault+0x4f
#5 0xffffffff8094ea68 at calltrap+0x8
#6 0xffffffff807a5ad9 at tcp_output+0x1339
#7 0xffffffff8079d1fd at tcp_do_segment+0x2cfd
#8 0xffffffff807997c1 at tcp_input_with_port+0xb61
#9 0xffffffff8079a46b at tcp_input+0xb
#10 0xffffffff8078bc2f at ip_input+0x11f
#11 0xffffffff8075f589 at netisr_dispatch_src+0xb9
#12 0xffffffff80744278 at ether_demux+0x138
#13 0xffffffff80745605 at ether_nh_input+0x355
#14 0xffffffff8075f589 at netisr_dispatch_src+0xb9
#15 0xffffffff807446a9 at ether_input+0x69
#16 0xffffffff80744261 at ether_demux+0x121
#17 0xffffffff80745605 at ether_nh_input+0x355
Uptime: 18h21m19s
Dumping 10524 out of 229348

__curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
55              __asm("movq %%gs:%P1,%0" : "=r" (td) : "n" (offsetof(struct

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