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Re: Alpha lcrash initialization problem - can't access memory

To: "Matt D. Robinson" <yakker@xxxxxxxxxxxxxx>
Subject: Re: Alpha lcrash initialization problem - can't access memory
From: Brian Hall <brianw.hall@xxxxxxxxxx>
Date: Thu, 27 Apr 2000 08:10:51 -0600 (MDT)
Cc: lkcd@xxxxxxxxxxx
In-reply-to: <Pine.LNX.4.21.0004261511530.6983-100000@xxxxxxxxxxxxxxxxxxx>
Reply-to: Brian Hall <brianw.hall@xxxxxxxxxx>
Sender: owner-lkcd@xxxxxxxxxxx
Dump of cmdset[] is attached. Appears to match the cmdset table in cmds.c
exactly.

I haven't altered the list of commands in cmds.c at all. I suspect the problem
is I have missed something in replacing the i386 stuff with Alpha functions. I
haven't changed all the function names that start with "i386", etc but that is
just cosmetic.


On 26-Apr-2000 Matt D. Robinson wrote:
> On Wed, 26 Apr 2000, Brian Hall wrote:
>|>OK, Alpha lcrash is dying before it gets very far. Any ideas why it can't
>|>access the memory in question?
>|>
>|>I can see where not being able to access memory being asked for causes a
>|>segfault, but why the report about "alloc.c: No such file or directory" ?
> 
> This is probably due to 'gdb's understanding of where alloc.c is
> found.
> 
> Looking at this stack trace, have you removed any commands as of late
> that wouldn't have been used?  Looks like something may be wrong with
> the commands structure.  Can you dump out the table?
> 
> --Matt
> 
>|>[root@dhcp96-180 lcrash]# gdb ./lcrash
>|>
>|>(gdb) run map.0 vmdump.0 -d 1
>|>Starting program: /CDR_UPLOAD/hallb/linux-2.2.13-1.0.3/cmd/lcrash/./lcrash
>|>map.0 vmdump.0 -d 1
>|>map = map.0, vmdump = vmdump.0, outfile = stdout
>|>
>|>Please wait...................
>|>
>|>Program received signal SIGSEGV, Segmentation fault.
>|>0x12001b110 in enqueue (list=0x1202fc1b8, new=0x20300000) at alloc.c:57
>|>57      alloc.c: No such file or directory.
>|>(gdb) where full
>|>#0  0x12001b110 in enqueue (list=0x1202fc1b8, new=0x20300000) at alloc.c:57
>|>        head = (element_t *) 0x0
>|>#1  0x12001c154 in get_page (index=4) at alloc.c:438
>|>        i = 0
>|>        b = (block_t *) 0x20300000
>|>        page = (void *) 0x12001c624
>|>        p = (page_t *) 0x1202fc1a0
>|>#2  0x12001cacc in alloc_block (size=80, flag=2, ra=0x1e) at alloc.c:695
>|>        i = 4
>|>        j = 1
>|>        blk = (void *) 0xfffffffff7f7ffdb
>|>        p = (page_t *) 0x11ffffad0
>|>        b = (block_t *) 0x0
>|>#3  0x1200038c8 in kl_block_alloc_func (size=80, flag=2, ra=0x1e) at
>|>#util.c:279
>|>        b = (void *) 0x12002be14
>|>#4  0x12002be6c in _kl_alloc_block (size=80, flags=2, ra=0x1e) at
>|>#kl_alloc.c:22
>|>        blk = (void *) 0x120003d4c
>|>#5  0x120003d6c in register_cmds (cmds=0x120144aa8) at command.c:17
>|>        i = 0
>|>        ret = 1
>|>        max_depth = 539896352
>|>        cmd_rec = (cmd_rec_t *) 0x0              
>|>#6  0x120002b20 in main (argc=5, argv=0x11ffffbb8) at main.c:200
>|>        i = 5
>|>        c = 512
>|>        errflg = 0         
>|>(gdb) p *list
>|>$1 = (element_t *) 0x0
>|>(gdb) p head
>|>$2 = (element_t *) 0x0
>|>(gdb) p new
>|>$3 = (element_t *) 0x20300000
>|>(gdb) p (head = *list)
>|>$4 = (element_t *) 0x0
>|>(gdb) p new
>|>$5 = (element_t *) 0x20300000
>|>(gdb) p new->next
>|>Cannot access memory at address 0x20300000.
>|>(gdb) p new->prev
>|>Cannot access memory at address 0x20300008.
>|>(gdb) p *list = new
>|>$6 = (element_t *) 0x20300000
>|>(gdb) p new->next
>|>Cannot access memory at address 0x20300000.
>|>(gdb) p new->prev
>|>Cannot access memory at address 0x20300008.     
>|>
>|>-- 
>|>http://www.bigfoot.com/~brihall
>|>Linux Consultant
>|>

-- 
http://www.bigfoot.com/~brihall
Linux Consultant

Attachment: cmd.table
Description: cmd.table

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