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LVM 0.9.1beta7 and ext3 0.0.6b



Hi,

I've recently been playing about with recent ext3 0.0.6b and lvm 0.9.1
beta7 and am now able to trigger an "Attempt to refile free buffer"
assertion.

This seems to "only" occur when using ext3 on the root filesystem.
Possibly that is related to the fact that the lvm utility I'm using to
reproduce this problem is modifying data in /etc.

The easist reproduction case I've come across to generate the assertion is
to load up lvm (insmod if necessary) and then run:

	while /bin/true; do vgscan -v; done

Then wait a while and it will generate the assertion.  You can speed it up
a bit by running another instance of the above command. :)

Again, it doesn't seem to generate the problem when using ext2 on the root
filesystem even if I have ext3 in use on seperate filesystems.  Also, you
do not need to have an LVM device actively mounted to generate this.  In
my case I have no active lvm devices up and running, just lvm-mod
insmoded.

Using ext3 0.0.6b and LVM 0.9.1beta6 I can't generate the assertion.

Any ideas or thoughts most welcome.  Anybody else seen any goofiness like
this?

Assertion below:

ksymoops 2.3.4 on i686 2.2.18pre11.  Options used
     -V (default)
     -k /proc/ksyms (default)
     -l /proc/modules (default)
     -o /lib/modules/2.2.18pre11/ (default)
     -m /boot/System.map-2.2.18pre11 (specified)

Warning (compare_maps): ksyms_base symbol module_list_R__ver_module_list not found in System.map.  Ignoring ksyms_base entry
Unable to handle kernel NULL pointer dereference at virtual address 00000000
current->tss.cr3 = 043b4000, %cr3 = 043b4000
*pde = 043ae067
Oops: 0002
CPU:    0
EIP:    0010:[<c012c25f>]
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010296
eax: 0000001e   ebx: c572a7e0   ecx: 00000012   edx: 00000029
esi: c572a7e0   edi: c7f9cc80   ebp: 0000000a   esp: c43b3e3c
ds: 0018   es: 0018   ss: 0018
Process vgscan (pid: 7851, process nr: 58, stackpage=c43b3000)
Stack: c7f9cc80 c015f9bb c572a7e0 c572a7e0 c3d52200 c015fbae c7f9cc80 c3d52200
       c7f9cc80 c7f9ccb0 c7f9cccc 00000280 00000246 0000027f c539a4a0 c015f86d
       c7f9cc80 00000280 c5919540 00000280 c7f9cc80 00000000 c015c98b c7f9cc80
Call Trace: [<c015f9bb>] [<c015fbae>] [<c015f86d>] [<c015c98b>] [<c015caa3>] [<c0152986>] [<c0120176>]
       [<c0139638>] [<c0129067>] [<c01329bc>] [<c0129e40>] [<c012a08e>] [<c010a034>]
Code: c6 05 00 00 00 00 00 e9 a6 00 00 00 90 80 7e 29 01 76 0a bb

>>EIP; c012c25f <refile_buffer+17/d0>   <=====
Trace; c015f9bb <cleanup_transaction+12b/158>
Trace; c015fbae <log_do_checkpoint+1c6/220>
Trace; c015f86d <log_wait_for_space+8d/b0>
Trace; c015c98b <start_this_handle+307/3a8>
Trace; c015caa3 <journal_start+77/a0>
Trace; c0152986 <ext3_notify_change+14a/360>
Trace; c0120176 <do_generic_file_read+8d2/8e0>
Trace; c0139638 <notify_change+40/64>
Trace; c0129067 <do_truncate+5f/ac>
Trace; c01329bc <open_namei+474/4d4>
Trace; c0129e40 <filp_open+44/f8>
Trace; c012a08e <sys_open+36/94>
Trace; c010a034 <system_call+34/38>
Code;  c012c25f <refile_buffer+17/d0>
00000000 <_EIP>:
Code;  c012c25f <refile_buffer+17/d0>   <=====
   0:   c6 05 00 00 00 00 00      movb   $0x0,0x0   <=====
Code;  c012c266 <refile_buffer+1e/d0>
   7:   e9 a6 00 00 00            jmp    b2 <_EIP+0xb2> c012c311 <refile_buffer+c9/d0>
Code;  c012c26b <refile_buffer+23/d0>
   c:   90                        nop
Code;  c012c26c <refile_buffer+24/d0>
   d:   80 7e 29 01               cmpb   $0x1,0x29(%esi)
Code;  c012c270 <refile_buffer+28/d0>
  11:   76 0a                     jbe    1d <_EIP+0x1d> c012c27c <refile_buffer+34/d0>
Code;  c012c272 <refile_buffer+2a/d0>
  13:   bb 00 00 00 00            mov    $0x0,%ebx


1 warning issued.  Results may not be reliable.





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