Sachin Sant wrote:
While running hackbench against today's next-20100208 (9056d31..)
on a s390 box, came across following BUG.
I can still recreate this issue against next-20100210.
kjournald starting. Commit interval 5 seconds
EXT3-fs (dasdb1): using internal journal
EXT3-fs (dasdb1): mounted filesystem with writeback data mode
BUG: Dentry 00000000fbde0ec0{i=13c39,n=bin} still in use (1) unmount of ext3 da
sdb1
------------ cut here ------------
kernel BUG at fs/dcache.c:676!
illegal operation: 0001 #1 SMP
Modules linked in: fuse loop zfcp qeth_l3 scsi_transport_fc ipv6 scsi_tgt vmur s
csi_mod ext3 jbd mbcache dasd_eckd_mod dasd_fba_mod dasd_mod qeth qdio ccwgroup
dm_mod
CPU: 1 Not tainted 2.6.33-rc7-autotest-next-20100210-5-default #1
Process umount (pid: 2125, task: 00000000fac04138, ksp: 00000000fb58bb80)
Krnl PSW : 0704100180000000 000000000023ef1c (shrink_dcache_for_umount_subtree+0
x3a8/0x3d0)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3
Krnl GPRS: 0000000000010000 0000000000686648 000000000000005c 00000000fffffffe
0000000000449fa2 0000000000000000 0000000000000001 0000000000000001
00000000000000e0 000000000060ba00 00000000fbde0e60 0000000000623218
00000000fac18e68 000000000046efc0 000000000023ef18 00000000fb58bcf8
Krnl Code: 000000000023ef0c: e3c0f0a80024 stg %r12,168(%r15)
000000000023ef12: c0e50010581f brasl %r14,449f50
000000000023ef18: a7f40001 brc 15,23ef1a
>000000000023ef1c: a7f40000 brc 15,23ef1c
000000000023ef20: c0b0001f217c larl %r11,623218
000000000023ef26: a7f4fe79 brc 15,23ec18
000000000023ef2a: c020001e656b larl %r2,60ba00
000000000023ef30: c0e5000722a8 brasl %r14,323480
Call Trace:
( <000000000023ef18>¨ shrink_dcache_for_umount_subtree+0x3a4/0x3d0)
<000000000023efa6>¨ shrink_dcache_for_umount+0x62/0x98
<000000000022a1fc>¨ generic_shutdown_super+0x3c/0x160
<000000000022a356>¨ kill_block_super+0x36/0x54
<000000000022ad00>¨ deactivate_super+0xa0/0xc8
<0000000000247826>¨ SyS_umount+0x72/0x404
<0000000000118bae>¨ sysc_noemu+0x10/0x16
<0000020000149836>¨ 0x20000149836
Last Breaking-Event-Address:
<000000000023ef18>¨ shrink_dcache_for_umount_subtree+0x3a4/0x3d0
kjournald starting. Commit interval 5 seconds
EXT3-fs (dasdb1): using internal journal
EXT3-fs (dasdb1): mounted filesystem with writeback data mode
BUG: Dentry 00000000fc937d40{i=13c39,n=bin} still in use (1) Ýunmount
of ext3 da
sdb1¨
------------" cut here "------------
kernel BUG at fs/dcache.c:676!
illegal operation: 0001 "#1" SMP
Modules linked in: fuse loop zfcp scsi_transport_fc qeth_l3 scsi_tgt
ipv6 vmur s
csi_mod ext3 jbd mbcache dasd_eckd_mod dasd_fba_mod dasd_mod qeth qdio
ccwgroup
dm_mod
CPU: 2 Not tainted 2.6.33-rc7-autotest-next-20100208-5-default #1
Process umount (pid: 2120, task: 00000000fb3da538, ksp: 00000000fc6c7b80)
Krnl PSW : 0704100180000000 000000000023ef54
(shrink_dcache_for_umount_subtree+0
x3a8/0x3d0)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:1 PM:0 EA:3
Krnl GPRS: 0000000000010000 0000000000686648 000000000000005c
00000000fffffffd
0000000000448a52 0000000000000000 0000000000000001
0000000000000001
00000000000000e0 000000000060ba00 00000000fc937ce0
0000000000623218
00000000fae10e68 000000000046ced8 000000000023ef50
00000000fc6c7cf8
Krnl Code: 000000000023ef44: e3c0f0a80024 stg %r12,168(%r15)
000000000023ef4a: c0e500104d5b brasl %r14,448a00
000000000023ef50: a7f40001 brc 15,23ef52
>000000000023ef54: a7f40000 brc 15,23ef54
000000000023ef58: c0b0001f2160 larl %r11,623218
000000000023ef5e: a7f4fe79 brc 15,23ec50
000000000023ef62: c020001e654f larl %r2,60ba00
000000000023ef68: c0e50007229c brasl %r14,3234a0
Call Trace:
(<000000000023ef50> shrink_dcache_for_umount_subtree+0x3a4/0x3d0)
<000000000023efde> shrink_dcache_for_umount+0x62/0x98
<000000000022a234> generic_shutdown_super+0x3c/0x160
<000000000022a38e> kill_block_super+0x36/0x54
<000000000022ad38> deactivate_super+0xa0/0xc8
<000000000024785e> SyS_umount+0x72/0x404
<0000000000118c26> sysc_noemu+0x10/0x16
<0000020000149836> 0x20000149836
Last Breaking-Event-Address:
"<000000000023ef50>" shrink_dcache_for_umount_subtree+0x3a4/0x3d0
Did not observe this with next-20100205. Also there doesn't seem to be
any patches applied to this code after the last release. So not
sure what could have caused this. Corresponding code is :
664 if (atomic_read(&dentry->d_count) != 0) {
665 printk(KERN_ERR
666 "BUG: Dentry %p{i=%lx,n=%s}"
667 " still in use (%d)"
668 " [unmount of %s %s]\n",
669 dentry,
670 dentry->d_inode ?
671 dentry->d_inode->i_ino : 0UL,
672 dentry->d_name.name,
673 atomic_read(&dentry->d_count),
674 dentry->d_sb->s_type->name,
675 dentry->d_sb->s_id);
676 BUG();
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
677 }
Let me know if i can provide any other information. Have attached
the config.
Thanks
-Sachin
--
---------------------------------
Sachin Sant
IBM Linux Technology Center
India Systems and Technology Labs
Bangalore, India
---------------------------------
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