[Jfs-discussion] kernel BUG at namei.c:479! - when removing deep directories via "rm -rf *"

[Pascal G. <Pas...@un...>]

I just wrote a little stress test programm (to evaluate a file system vor many
directories and many small files), so I wrote a test program, making directories
with 10 subdirs (e.g. /gross/ax/hs/je/ah/hd/be/he/za/jl/k9 and writes a 64 k
file in it).

Kernel is 2.4.19 with 64GB max mem and it is a SMP machine using 2 Pentium 4
CPUs (2.4 GHz each), I used jfs Version 1.1.1.

After then I do a "cd /gross; rm -rf *". It gives a segmentation fault of "rm"
with the following dmesg output:

JFS development version: $Name: v1_1_1 $
assert(!test_cflag(COMMIT_Nolink, ip))
kernel BUG at namei.c:479!
invalid operand: 0000 2.4.19-64GB-SMP #1 SMP Fri Sep 13 13:15:53 UTC 2002
CPU:    0
EIP:    0010:[<d10c1f17>]    Not tainted
EFLAGS: 00010296
eax: 00000027   ebx: 00000007   ecx: c553202c   edx: c031bd1c
esi: 00000000   edi: c907ad00   ebp: 00000033   esp: c5533f34
ds: 0018   es: 0018   ss: 0018
Process rm (pid: 1108, stackpage=c5533000)
Stack: d10e1a9b d10e21a0 00000000 00000000 000b15a4 c907a700 c907ad00 00000002 
       c3244280 c84ef400 c907a700 c907a780 c5532000 c01626f0 c907a700 caba47a0 
       c6a38000 caba47a0 c5533f90 caba47a0 c016298f c907a700 caba47a0 caba4720 
Call Trace:    [<d10e1a9b>] [<d10e21a0>] [<c01626f0>] [<c016298f>] [<c01095c7>]
Modules: [(jfs:<d10c0060>:<d10e37fc>)]
Code: 0f 0b df 01 a7 1a 0e d1 5b 5e e9 9d fd ff ff 31 d2 89 c8 e8 


The partition is a multipathed md device but this error also occurs on a normal
connected drive with that size. The disc is a hardware raid connected via fibre
channel (Q-Logic 2300 adapter).

df -k:
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/md0               1035596     79476    903512   9% /
/dev/sda2                69995      6261     60120  10% /boot
/dev/sdb2                69995        13     66368   1% /boot2
/dev/md2               4134832    195744   3729044   5% /usr
/dev/md3               8261964     47372   7794900   1% /var
shmfs                  1034204         0   1034204   0% /dev/shm
/dev/md5             788413044   3517100 784895944   1% /gross


The test program to make these files was:

#!/usr/bin/perl

$riesig="";
for ($i=1;$i<=65536;$i++) 
{
  $riesig.="0";
}

$prefix="/gross";
while (true)
{
  $dir="";
  for ($i=1;$i<=10;$i++)
  {
    $dir.="/".chr(int(rand(26))+97).chr(int(rand(26))+97);
    mkdir $prefix.$dir,0700;
  }
  $file=">".$prefix.$dir."/nuller";
  open(TESTFILE,$file);
  print TESTFILE $riesig;
  close(TESTFILE);
}