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SubjectRe: [VMBUG] 2.4.15-pre7 Severe VM Bugs in 2.4.15-pre7
On Wed, Nov 21, 2001 at 04:18:27PM +1100, Keith Owens wrote:
> On Tue, 20 Nov 2001 23:14:49 -0700,
> "Jeff V. Merkey" <jmerkey@vger.timpanogas.org> wrote:
> >ksymoops 2.4.0 on i686 2.4.15-pre7. Options used
> > -m /boot/System.map-2.4.15-pre7 (default)
> >Error (regular_file): read_system_map stat /boot/System.map-2.4.15-pre7 failed
>
> Without a valid System.map, the decode is going to be very vague. When
> you see offset 5207 in code sized 32410 you know you don't have enough
> detail. Try the decode again with a valid System.map.

Got it. I need to check my build scripts and figure out why it did
not copy the System.Map to /boot/. I updated the file, and you
were correct. The oops looks more readable. Getting a crash in
the VM when a kfree() is attempted. We are getting a page fault, it
appears.

Jeff



ksymoops 2.4.0 on i686 2.4.15-pre7. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.15-pre7/ (default)
-m /boot/System.map-2.4.15-pre7 (default)

Warning: You did not tell me where to find symbol information. I will
assume that the log matches the kernel and modules that are running
right now and I'll use the default options above for symbol resolution.
If the current kernel and/or modules do not match the log, you can get
more accurate output by telling me the kernel version and where to find
map, modules, ksyms etc. ksymoops -h explains the options.

No modules in ksyms, skipping objects
Warning (read_lsmod): no symbols in lsmod, is /proc/modules a valid lsmod file?
Nov 20 09:58:50 scimitar kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000008
Nov 20 09:58:50 scimitar kernel: c0172f1b
Nov 20 09:58:50 scimitar kernel: *pde = 00000000
Nov 20 09:58:50 scimitar kernel: Oops: 0000
Nov 20 09:58:50 scimitar kernel: CPU: 1
Nov 20 09:58:50 scimitar kernel: EIP: 0010:[<c0172f1b>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
Nov 20 09:58:50 scimitar kernel: EFLAGS: 00010246
Nov 20 09:58:50 scimitar kernel: eax: 00000000 ebx: cea30000 ecx: cea30018 edx: 000002b8
Nov 20 09:58:50 scimitar kernel: esi: 00000000 edi: 00000000 ebp: 0000002f esp: cead5ab8
Nov 20 09:58:50 scimitar kernel: ds: 0018 es: 0018 ss: 0018
Nov 20 09:58:50 scimitar kernel: Process mount (pid: 720, stackpage=cead5000)
Nov 20 09:58:50 scimitar kernel: Stack: cea30018 c0173e29 cea30018 00000080 00000009 cea30018 00000003 00000004
Nov 20 09:58:50 scimitar kernel: 000000ae 09c23fff 00000000 c1556600 00000000 00000000 00000009 c019b9bb
Nov 20 09:58:50 scimitar kernel: cead5b28 00001000 cead5b5c 00001000 c030f4fc 00000009 c0172e39 c0172e7f
Nov 20 09:58:50 scimitar kernel: Call Trace: [<c0173e29>] [<c019b9bb>] [<c0172e39>] [<c0172e7f>] [<c019a64a>]
Nov 20 09:58:50 scimitar kernel: [<c0124382>] [<c014463c>] [<c013c560>] [<c0295e70>] [<c01124ba>] [<c0176127>]
Nov 20 09:58:50 scimitar kernel: [<c0124d91>] [<c0124da2>] [<c0112320>] [<c010700c>] [<c0124804>] [<c0112320>]
Nov 20 09:58:50 scimitar kernel: [<c010700c>] [<c02949fb>] [<c014bf8c>] [<c014cf8f>] [<c013c560>] [<c012d9e1>]
Nov 20 09:58:50 scimitar kernel: [<c01241ba>] [<c0124214>] [<c0124382>] [<c012779c>] [<c01277c9>] [<c01124ba>]
Nov 20 09:58:50 scimitar kernel: [<c0128742>] [<c0183a39>] [<c01277c9>] [<c0154922>] [<c01125f0>] [<c0294922>]
Nov 20 09:58:50 scimitar kernel: [<c0137fe1>] [<c0138460>] [<c013894f>] [<c0148f53>] [<c0112320>] [<c010700c>]
Nov 20 09:58:50 scimitar kernel: [<c01491ec>] [<c014905c>] [<c01492b0>] [<c0106f1b>]
Nov 20 09:58:50 scimitar kernel: Code: 8b 50 08 2b 51 f0 89 50 08 8b 41 f4 ff 48 04 8b 41 f8 83 f8

>>EIP; c0172f1b <NWFSFree+b/e0> <=====
Trace; c0173e29 <ScanDiskDevices+449/460>
Trace; c019b9bb <nwvp_part_scan+1b/4d0>
Trace; c0172e39 <NWFSIOAlloc+19/70>
Trace; c0172e7f <NWFSIOAlloc+5f/70>
Trace; c019a64a <nwvp_scan_routine+8a/600>
Trace; c0124382 <handle_mm_fault+62/d0>
Trace; c014463c <dput+1c/150>
Trace; c013c560 <cached_lookup+10/50>
Trace; c0295e70 <rb_insert_color+70/f0>
Trace; c01124ba <do_page_fault+19a/4e0>
Trace; c0176127 <NWFSVolumeScan+57/180>
Trace; c0124d91 <do_mmap_pgoff+421/4f0>
Trace; c0124da2 <do_mmap_pgoff+432/4f0>
Trace; c0112320 <do_page_fault+0/4e0>
Trace; c010700c <error_code+34/3c>
Trace; c0124804 <__vma_link+64/c0>
Trace; c0112320 <do_page_fault+0/4e0>
Trace; c010700c <error_code+34/3c>
Trace; c02949fb <clear_user+2b/40>
Trace; c014bf8c <padzero+1c/20>
Trace; c014cf8f <load_elf_binary+90f/a50>
Trace; c013c560 <cached_lookup+10/50>
Trace; c012d9e1 <__alloc_pages+41/180>
Trace; c01241ba <do_anonymous_page+8a/b0>
Trace; c0124214 <do_no_page+34/140>
Trace; c0124382 <handle_mm_fault+62/d0>
Trace; c012779c <filemap_nopage+bc/200>
Trace; c01277c9 <filemap_nopage+e9/200>
Trace; c01124ba <do_page_fault+19a/4e0>
Trace; c0128742 <read_cache_page+42/120>
Trace; c0183a39 <nwfs_read_super+79/1b0>
Trace; c01277c9 <filemap_nopage+e9/200>
Trace; c0154922 <ext2_get_page+22/80>
Trace; c01125f0 <do_page_fault+2d0/4e0>
Trace; c0294922 <__generic_copy_from_user+32/60>
Trace; c0137fe1 <read_super+b1/140>
Trace; c0138460 <get_sb_nodev+30/60>
Trace; c013894f <do_kern_mount+df/150>
Trace; c0148f53 <do_add_mount+23/e0>
Trace; c0112320 <do_page_fault+0/4e0>
Trace; c010700c <error_code+34/3c>
Trace; c01491ec <do_mount+13c/160>
Trace; c014905c <copy_mount_options+4c/a0>
Trace; c01492b0 <sys_mount+a0/100>
Trace; c0106f1b <system_call+33/38>
Code; c0172f1b <NWFSFree+b/e0>
00000000 <_EIP>:
Code; c0172f1b <NWFSFree+b/e0> <=====
0: 8b 50 08 mov 0x8(%eax),%edx <=====
Code; c0172f1e <NWFSFree+e/e0>
3: 2b 51 f0 sub 0xfffffff0(%ecx),%edx
Code; c0172f21 <NWFSFree+11/e0>
6: 89 50 08 mov %edx,0x8(%eax)
Code; c0172f24 <NWFSFree+14/e0>
9: 8b 41 f4 mov 0xfffffff4(%ecx),%eax
Code; c0172f27 <NWFSFree+17/e0>
c: ff 48 04 decl 0x4(%eax)
Code; c0172f2a <NWFSFree+1a/e0>
f: 8b 41 f8 mov 0xfffffff8(%ecx),%eax
Code; c0172f2d <NWFSFree+1d/e0>
12: 83 f8 00 cmp $0x0,%eax


2 warnings issued. Results may not be reliable.
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