[Bug 272319] FreeBSD kernel crash on MPD5 restart with PPP configuration.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272319

--- Comment #21 from ny <ny2007ltd@gmail.com> ---
FreeBSD-14.0-CURRENT-i386-20230720-a52f23f4c49e-264226-disc1.iso 
(default kernel + MPD5 start)

FreeBSD fb 14.0-CURRENT FreeBSD 14.0-CURRENT i386 1400093 #0
main-n264226-a52f23f4c49e: Thu Jul 20 07:59:56 UTC 2023    
root@releng1.nyi.freebsd.org:/usr/obj/usr/src/i386.i386/sys/GENERIC  i386

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x1e588898
fault code              = supervisor write data, page not present
instruction pointer     = 0x20:0xfb062d
stack pointer           = 0x28:0x172b5550
frame pointer           = 0x28:0x172b555c
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 824 (mpd5)
trap number             = 12
panic: page fault
cpuid = 0
time = 1691310521
KDB: stack backtrace:
db_trace_self_wrapper(0,17e073a0,172b5510,1e588898,c,...) at
db_trace_self_wrapper+0x28/frame 0x172b53a0
vpanic(13faf8e,172b53dc,172b53dc,172b5408,1391746,...) at vpanic+0xf3/frame
0x172b53bc
panic(13faf8e,14a24f7,0,fffff,c09b,...) at panic+0x14/frame 0x172b53d0
trap_fatal(2,1a2d79c,0,172b5440,0,...) at trap_fatal+0x346/frame 0x172b5408
trap_pfault(1e588898,0,0) at trap_pfault+0x6f/frame 0x172b543c
trap(172b5510,8,28,28,f,...) at trap+0x316/frame 0x172b5504
calltrap() at 0xffc0321f/frame 0x172b5504
--- trap 0xc, eip = 0xfb062d, esp = 0x172b5550, ebp = 0x172b555c ---
hashinit(10,1861d908,1e588898,17e073a0,77bc000,...) at hashinit+0xed/frame
0x172b555c
vnet_netgraph_init(0) at vnet_netgraph_init+0x37/frame 0x172b557c
vnet_register_sysinit(1861dbd0) at vnet_register_sysinit+0xe1/frame 0x172b5594
linker_load_module(5a95300,1860eeec,0) at linker_load_module+0xa7c/frame
0x172b5770
linker_load_dependencies(5a95300) at linker_load_dependencies+0x189/frame
0x172b57a4
link_elf_load_file(1800f28,5a96900,172b5920) at link_elf_load_file+0x560/frame
0x172b5890
linker_load_module(0,0,172b5a88) at linker_load_module+0x8b3/frame 0x172b5a74
kern_kldload(17e073a0,e6e5800,172b5ab0) at kern_kldload+0x142/frame 0x172b5a9c
sys_kldload(17e073a0,17e0764c) at sys_kldload+0x50/frame 0x172b5ac0
syscall(172b5ba8,3b,3b,3b,0,...) at syscall+0x1c5/frame 0x172b5b9c
Xint0x80_syscall() at 0xffc03479/frame 0x172b5b9c
--- syscall (304, FreeBSD ELF32, kldload), eip = 0x20ae897f, esp = 0xffbfea60,
ebp = 0xffbfeb20 ---
KDB: enter: panic

0x00f6b6f9 in doadump (textdump=0) at /usr/src/sys/kern/kern_shutdown.c:407
407             dump_savectx();
(kgdb) #0  0x00f6b6f9 in doadump (textdump=0)
    at /usr/src/sys/kern/kern_shutdown.c:407
#1  0x00a0d3c4 in db_dump (dummy=<optimized out>, dummy2=<optimized out>, 
    dummy3=<optimized out>, dummy4=<optimized out>)
    at /usr/src/sys/ddb/db_command.c:593
#2  0x00a0d1cd in db_command (last_cmdp=<optimized out>, 
    cmd_table=<optimized out>, dopager=true)
    at /usr/src/sys/ddb/db_command.c:506
#3  0x00a0cedc in db_command_loop () at /usr/src/sys/ddb/db_command.c:553
#4  0x00a1018d in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:270
#5  0x00fb1cc6 in kdb_trap (type=3, code=0, tf=0x172b5358)
    at /usr/src/sys/kern/subr_kdb.c:784
#6  0x01390e51 in trap (frame=0x172b5358) at /usr/src/sys/i386/i386/trap.c:694
#7  0xffc0321f in ?? ()
#8  0x172b5358 in ?? ()
#9  0x00000028 in ?? ()
#10 0x00000028 in ?? ()
#11 0x00000100 in ?? ()
#12 0x172b53dc in ?? ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(kgdb)

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