kern/52943

[Eugene Grosbein]

The following reply was made to PR kern/52943; it has been noted by GNATS.

From: Eugene Grosbein <eugen at grosbein.pp.ru>
To: Kris Kennaway <kris at obsecurity.org>
Cc: bug-followup at freebsd.org
Subject: Re: kern/52943
Date: Sun, 17 Aug 2003 22:24:56 +0800

 Here comes GDB backtrace. Note that after the first 'panic' and 'c'
 commands it does not write crashdump and does not reboot.
 It just sits idle. After the second 'panic' it works.
 The crashdump and kernel.debug are available on request (3.3Mb compressed).
 
 Script started on Sun Aug 17 22:06:37 2003
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 IdlePTD at phsyical address 0x0037d000
 initial pcb at physical address 0x002dab00
 panicstr: from debugger
 panic messages:
 ---
 panic: from debugger
 
 syncing disks... 
 
 Fatal trap 12: page fault while in kernel mode
 fault virtual address	= 0x30
 fault code		= supervisor read, page not present
 instruction pointer	= 0x8:0xc01d53b7
 stack pointer	        = 0x10:0xc029c39c
 frame pointer	        = 0x10:0xc029c3a4
 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		= Idle
 interrupt mask		= tty bio 
 
 
 Fatal trap 3: breakpoint instruction fault while in kernel mode
 instruction pointer	= 0x8:0xc0236701
 stack pointer	        = 0x10:0xc2e8de6c
 frame pointer	        = 0x10:0xc2e8de74
 code segment		= base 0x0, limit 0xfffff, type 0x1b
 			= DPL 0, pres 1, def32 1, gran 1
 processor eflags	= interrupt enabled, IOPL = 0
 current process		= 4 (bufdaemon)
 interrupt mask		= tty bio 
 panic: from debugger
 Uptime: 1m13s
 
 dumping to dev #ad/0x30001, offset 32768
 dump ata0: resetting devices .. done
 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 
 ---
 #0  dumpsys () at /usr/local/src/sys/kern/kern_shutdown.c:487
 487		if (dumping++) {
 (kgdb) bt
 #0  dumpsys () at /usr/local/src/sys/kern/kern_shutdown.c:487
 #1  0xc0153fae in boot (howto=260)
     at /usr/local/src/sys/kern/kern_shutdown.c:316
 #2  0xc01543fd in panic (fmt=0xc025ff84 "from debugger")
     at /usr/local/src/sys/kern/kern_shutdown.c:595
 #3  0xc0126f01 in db_panic (addr=-1071421695, have_addr=0, count=-1, 
     modif=0xc2e8dce8 "") at /usr/local/src/sys/ddb/db_command.c:435
 #4  0xc0126ea2 in db_command (last_cmdp=0xc029fa78, cmd_table=0xc029f8b8, 
     aux_cmd_tablep=0xc02d5d98) at /usr/local/src/sys/ddb/db_command.c:333
 #5  0xc0126f66 in db_command_loop () at /usr/local/src/sys/ddb/db_command.c:457
 #6  0xc01291bb in db_trap (type=3, code=0)
     at /usr/local/src/sys/ddb/db_trap.c:71
 #7  0xc02364a2 in kdb_trap (type=3, code=0, regs=0xc2e8de2c)
     at /usr/local/src/sys/i386/i386/db_interface.c:158
 #8  0xc0244544 in trap_fatal (frame=0xc2e8de2c, eva=0)
     at /usr/local/src/sys/i386/i386/trap.c:969
 #9  0xc0243a69 in trap (frame={tf_fs = 16, tf_es = 16, tf_ds = 16, 
       tf_edi = -1070684256, tf_esi = 0, tf_ebp = -1024926092, 
       tf_isp = -1024926120, tf_ebx = 134, tf_edx = 0, tf_ecx = 32, 
       tf_eax = 38, tf_trapno = 3, tf_err = 0, tf_eip = -1071421695, tf_cs = 8, 
       tf_eflags = 582, tf_esp = -1071055937, tf_ss = -1071071063})
     at /usr/local/src/sys/i386/i386/trap.c:238
 #10 0xc0236701 in Debugger (msg=0xc028c0a9 "manual escape to debugger")
     at machine/cpufunc.h:67
 ---Type <return> to continue, or q <return> to quit---
 #11 0xc0231a5e in scgetc (sc=0xc02f63a0, flags=2)
     at /usr/local/src/sys/dev/syscons/syscons.c:3164
 #12 0xc022e109 in sckbdevent (thiskbd=0xc02e8ea0, event=0, arg=0xc02f63a0)
     at /usr/local/src/sys/dev/syscons/syscons.c:617
 #13 0xc0225967 in atkbd_intr (kbd=0xc02e8ea0, arg=0x0)
     at /usr/local/src/sys/dev/kbd/atkbd.c:464
 #14 0xc0250fe8 in atkbd_isa_intr (arg=0xc02e8ea0)
     at /usr/local/src/sys/isa/atkbd_isa.c:140
 #15 0xc0156ffd in tsleep (ident=0xc02db43c, priority=4, 
     wmesg=0xc026befe "psleep", timo=100)
     at /usr/local/src/sys/kern/kern_synch.c:418
 #16 0xc017c94a in buf_daemon () at /usr/local/src/sys/kern/vfs_bio.c:1850
 (kgdb) q
 
 Script done on Sun Aug 17 22:06:42 2003