Most recent kernel where this bug did not occur: 2.6.15   
Distribution: Gentoo Base System version 1.6.13   
   
Hardware Environment:    
4-way Opteron, 8G RAM, LSI Megaraid 320-2X   
   
Software Environment:   
Thread model: posix   
gcc version 3.4.4 (Gentoo 3.4.4-r1, ssp-3.4.4-1.0, pie-8.7.8)   
Compilation info: CC='gcc'  CFLAGS='-march=opteron -mtune=opteron -O4 -pipe   
-D_GNU_SOURCE -DHAVE_ERRNO_AS_DEFINE=1'  CXX='gcc'  CXXFLAGS='-march=opteron   
-mtune=opteron -O4 -pipe -D_GNU_SOURCE -felide-constructors -fno-exceptions   
-fno-rtti -DUSE_MYSYS_NEW'  LDFLAGS=''  ASFLAGS=''   
LIBC:    
lrwxrwxrwx  1 root root 13 Dec 28 21:18 /lib/libc.so.6 -> libc-2.3.5.so   
-rwxr-xr-x  1 root root 1255872 Dec 28 21:18 /lib/libc-2.3.5.so   
-rw-r--r--  1 root root 3890174 Dec 28 21:18 /usr/lib/libc.a   
-rwxr-xr-x  1 root root 210 Dec 28 21:18 /usr/lib/libc.so   
Configure command: ./configure '--prefix=/usr' '--libdir=/usr/lib'   
'--exec-prefix=/usr' '--datadir=/usr/share' '--libexecdir=/usr/sbin'   
'--sysconfdir=/etc' '--mandir=/usr/share/man' '--infodir=/usr/share/info'   
'--includedir=/usr/include' '--localstatedir=/var/lib/mysql'   
'--enable-assembler' '--with-mysql-user=mysql' '--with-innodb'   
'--with-ndbcluster' '--with-unix-socket-path=/var/run/mysqld/mysqld.sock'   
'--with-charset=cp1251' '--with-extra-charsets=latin1,koi8r,cp1251,utf8'   
'--with-openssl' '--without-readline' '--without-libedit'   
'--enable-thread-safe-client' '--with-named-thread-libs=-lpthread'   
'--build=x86_64-pc-linux-gnu' 'CFLAGS=-march=opteron -mtune=opteron -O4 -pipe   
-D_GNU_SOURCE -DHAVE_ERRNO_AS_DEFINE=1' 'CXXFLAGS=-march=opteron   
-mtune=opteron -O4 -pipe -D_GNU_SOURCE -felide-constructors -fno-exceptions   
-fno-rtti -DUSE_MYSYS_NEW' 'CXX=gcc' 'build_alias=x86_64-pc-linux-gnu'    
   
Problem Description:   
Stress testing of new quad-Opteron host triggers BUG at   
fs/inode.c:1057. It more or less stable ( during a fiew hours )    
occur under heavy load caused by dbench with concurrency 500    
( dbench -c /usr/share/dbench/client_plain.txt 500 ) when dbench    
reads/writes on XFS partition. I've tried to reproduce it on reiserfs    
over the ~24 hours but with no success.   
   
[68621.791989] ----------- [cut here ] --------- [please bite here ] ---------   
[68621.800197] Kernel BUG at fs/inode.c:1057   
[68621.804892] invalid operand: 0000 [1] SMP    
[68621.809729] CPU 1    
[68621.812125] Modules linked in: ipt_REJECT ipt_state iptable_filter   
[68621.819332] Pid: 25756, comm: dbench Not tainted 2.6.15 #2   
[68621.825760] RIP: 0010:[<ffffffff801844a0>]   
<ffffffff801844a0>{generic_delete_inode+217}   
[68621.834921] RSP: 0018:ffff81016af5fec8  EFLAGS: 00010202   
[68621.841313] RAX: ffff81000801bfc0 RBX: ffff81012f185078 RCX:   
0000000000000034   
[68621.849566] RDX: 0000000000000003 RSI: ffff81012f185298 RDI:   
ffff81000801bfb8   
[68621.857881] RBP: 0000000000000000 R08: 0000000000000003 R09:   
0000000000000000   
[68621.866222] R10: ffff8100dc0d1b48 R11: ffff810112178a80 R12:   
ffff81013324be78   
[68621.874533] R13: 00007fffff8b9d80 R14: ffff81012f185078 R15:   
0000000000516010   
[68621.882855] FS:  00002aaaaade6ae0(0000) GS:ffffffff80448880(0000)   
knlGS:0000000000000000   
[68621.892329] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b   
[68621.898980] CR2: 00002aaaaaac1008 CR3: 000000015dd74000 CR4:   
00000000000006e0   
[68621.907288] Process dbench (pid: 25756, threadinfo ffff81016af5e000, task   
ffff8101623c5900)   
[68621.923377] Stack: ffff81012b857000 0000000000000000 ffff81012b857000   
ffffffff8017b933    
[68621.932502]        ffff8100eb50ceb8 ffff8101feeb3bc0 0000000a585b4dce   
ffff81012b85701c    
[68621.941871]        0000000000000010 ffff810100000000    
[68621.947755] Call Trace:<ffffffff8017b933>{sys_unlink+237}   
<ffffffff80185b21>{mntput_no_expire+23}   
[68621.958197]        <ffffffff8016c163>{filp_close+89}   
<ffffffff8010d58e>{system_call+126}   
[68621.967720]           
[68621.970445]    
[68621.970446] Code: 0f 0b 68 73 61 31 80 c2 21 04 48 89 df 5b 5b 5d e9 ec eb   
ff    
[68621.980818] RIP <ffffffff801844a0>{generic_delete_inode+217} RSP   
<ffff81016af5fec8>   
   
Steps to reproduce:   
run dbench -c /usr/share/dbench/client_plain.txt 500 in circle on XFS   
partition over a few hours.   
http://sysadminday.org.ru/config-2.6.15