Re: Loading carp module crash i386 (12-ALPHA2), seems VNET related

On Mon, 20 Aug 2018 16:26:29 +0200
Olivier Cochard-Labbé <olivier_at_freebsd.org> wrote:

> Just loading carp kernel module is enough to panic it:
> 
> [root_at_router]~# uname -a
> FreeBSD router.bsdrp.net 12.0-ALPHA2 FreeBSD 12.0-ALPHA2  r338100M
> i386 [root_at_router]~# kldload carp
> Fatal trap 12: page fault while in kernel mode

How many vnets were already instantiated at the time of kldloading
carp?  Does the panic ocur with no (non-default) vnets instantiated?

> cpuid = 0; apic id = 00
> fault virtual address   = 0x14de0f4c
> fault code              = supervisor write, page not present
> instruction pointer     = 0x20:0x1201657c
> stack pointer           = 0x28:0x11f3e804
> frame pointer           = 0x28:0x11f3e80c
> 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         = 55291 (kldload)
> [ thread pid 55291 tid 100070 ]
> Stopped at      vnet_carpstats_init+0x2c:       movl
> %eax,__stop_set_vnet(%ecx,%esi,1)
> 
> A backtrace on kgdb gives this output:
> 
> (kgdb) bt
> #0  __curthread () at ./machine/pcpu.h:226
> #1  doadump (textdump=<optimized out>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_shutdown.c:366
> #2  0x009f69ee in db_dump (dummy=302081404, dummy2=false, dummy3=-1,
> dummy4=0x11f3e4fc "") at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/ddb/db_command.c:574
> #3  0x009f67c7 in db_command (last_cmdp=<optimized out>,
> cmd_table=<optimized out>, dopager=<optimized out>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/ddb/db_command.c:481
> #4  0x009f6520 in db_command_loop () at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/ddb/db_command.c:534
> #5  0x009f978d in db_trap (type=12, code=0) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/ddb/db_main.c:252
> #6  0x0113e29e in kdb_trap (type=12, code=0, tf=0x11f3e7c4) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/subr_kdb.c:693
> #7  0x016d593c in trap_fatal (frame=0x11f3e7c4, eva=<optimized out>)
> at /usr/local/BSDRP/TESTING/FreeBSD/src/sys/i386/i386/trap.c:989
> #8  0x016d5a43 in trap_pfault (frame=<optimized out>, usermode=0,
> eva=350097228) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/i386/i386/trap.c:827
> #9  0x016d508f in trap (frame=0x11f3e7c4) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/i386/i386/trap.c:519
> #10 0xffc0315d in ?? ()
> #11 0x11f3e7c4 in ?? ()
> #12 0x0121c7ef in vnet_register_sysinit (arg=0x120182cc
> <vnet_carpstats_init_vnet_init>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/net/vnet.c:500
> #13 0x010c18f0 in linker_file_sysinit (lf=<optimized out>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_linker.c:236
> #14 linker_load_file (filename=<optimized out>, result=<optimized
> out>)
> out>at /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_linker.c:462
> #15 linker_load_module (kldname=<optimized out>, modname=0x11449c00
> "carp", parent=0x0, verinfo=0x0, lfpp=0x11f3ea6c) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_linker.c:2092
> #16 0x010c30d1 in kern_kldload (td=0x1157c380, file=0x11449c00 "carp",
> fileid=0x11f3ea98) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_linker.c:1071
> #17 0x010c31ee in sys_kldload (td=0x1157c380, uap=0x1157c604) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/kern/kern_linker.c:1097
> #18 0x016d6217 in syscallenter (td=<optimized out>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/i386/i386/../../kern/subr_syscall.c:135
> #19 syscall (frame=0x11f3eba8) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/i386/i386/trap.c:1152
> #20 0xffc033a7 in ?? ()
> #21 0x11f3eba8 in ?? ()
> Backtrace stopped: Cannot access memory at address 0xffbfecec
> (kgdb) frame 12
> #12 0x0121c7ef in vnet_register_sysinit (arg=0x120182cc
> <vnet_carpstats_init_vnet_init>) at
> /usr/local/BSDRP/TESTING/FreeBSD/src/sys/net/vnet.c:500
> 500                     vs->func(vs->arg);
> 
> 
> Regards,
> 
> Olivier
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