a panic on uart_z8530_class?

[Kostik Belousov]

On Sat, May 08, 2010 at 01:00:32PM -0700, Weongyo Jeong wrote:
> Hello,
> 
> Anyone encountered this panic on recent CURRENT kernel?
> 
> [root at test ~]# uname -a
> FreeBSD test 9.0-CURRENT FreeBSD 9.0-CURRENT #16: Sun May  2 00:24:12 PDT 2010     root at test:/usr/obj/usr/src/sys/GENERIC  amd64
> 
> [root at test /home/freebsd/sys/modules/bwn]# ifconfig wlan0 create wlandev bwn0
> 
> Fatal trap 12: page fault while in kernel mode
> cpuid = 0; apic id = 00
> fault virtual address   = 0x0
> fault code              = supervisor read instruction, page not present
> instruction pointer     = 0x20:0x0
> stack pointer           = 0x28:0xffffff8073cdd810
> frame pointer           = 0x28:0xffffff8073cdd8e0
> 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         = 1795 (ifconfig)
> [ thread pid 1795 tid 100096 ]
> Stopped at      0:      *** error reading from address 0 ***
> db> bt
> Tracing pid 1795 tid 100096 td 0xffffff0003d8b390
> uart_z8530_class() at 0
uartXXX there is collateral, actual panic happen in the ifc_simple_create().

> ifc_simple_create() at ifc_simple_create+0x89
> if_clone_createif() at if_clone_createif+0x64
> ifioctl() at ifioctl+0x685
> kern_ioctl() at kern_ioctl+0xc5
> ioctl() at ioctl+0xfd
> syscall() at syscall+0x102
> Xfast_syscall() at Xfast_syscall+0xe1
> --- syscall (54, FreeBSD ELF64, ioctl), rip = 0x800b86d0c, rsp = 0x7fffffffe2e8, rbp = 0x7fffffffee36 ---
> db> call doadump
> Physical memory: 3916 MB
> Dumping 1239 MB: 1224 1208 1192 1176 1160 1144 1128 1112 1096 1080 1064 1048 1032 1016 1000 984 968 952 936 920 904 888 872 856 840 824 808 792 776 760 744 728 712 696 680 664 648 632 616 600 584 568 552 536 520 504 488 472 456 440 424 408 392 376 360 344 328 312 296 280 264 248 232 216 200 184 168 152 136 120 104 88 72 56 40 24 8
> Dump complete
> = 0
> db> reset
> 
> [root at test ~]# kgdb /boot/kernel/kernel /var/crash/vmcore.1
> GNU gdb 6.1.1 [FreeBSD]
> Copyright 2004 Free Software Foundation, Inc.
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> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "amd64-marcel-freebsd"...
> Cannot access memory at address 0xffffff0127ffffe0
> (kgdb) bt
> #0  0x0000000000000000 in ?? ()
> Cannot access memory at address 0x0
> (kgdb) q
> 
> regards,
> Weongyo Jeong
> 
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