Re: [patch 00/12] Slab defragmentation V3

Michal Piotrowski
2007-06-08T18:02:29Z

bash shared mapping + your script in a loop
while true; do sudo ./run.sh; done > res3.txt

[ 2866.154597] =======================================================
[ 2866.162384] [ INFO: possible circular locking dependency detected ]
[ 2866.168698] 2.6.22-rc4-mm2 #1
[ 2866.171671] -------------------------------------------------------
[ 2866.177972] bash-shared-map/3245 is trying to acquire lock:
[ 2866.183566] (slub_lock){----}, at: [<c0482510>] kmem_cache_defrag+0x18/0xb3

l *kmem_cache_defrag+0x18
0xc1082510 is in kmem_cache_defrag (mm/slub.c:2742).
2737 struct kmem_cache *s;
2738 unsigned long pages = 0;
2739 void *scratch;
2740
2741 down_read(&slub_lock);
2742 list_for_each_entry(s, &slab_caches, list) {
2743
2744 /*
2745 * The slab cache must have defrag methods.
2746 */

[ 2866.190800]
[ 2866.190801] but task is already holding lock:
[ 2866.196746] (&inode->i_alloc_sem){--..}, at: [<c0498b07>] notify_change+0xdf/0x2ec

l *notify_change+0xdf
0xc1098b07 is in notify_change (fs/attr.c:145).
140 return 0;
141
142 if (ia_valid & ATTR_SIZE)
143 down_write(&dentry->d_inode->i_alloc_sem);
144
145 if (inode->i_op && inode->i_op->setattr) {
146 error = security_inode_setattr(dentry, attr);
147 if (!error)
148 error = inode->i_op->setattr(dentry, attr);
149 } else {

[ 2866.204761]
[ 2866.204762] which lock already depends on the new lock.
[ 2866.204764]
[ 2866.213058]
[ 2866.213060] the existing dependency chain (in reverse order) is:
[ 2866.220630]
[ 2866.220631] -> #2 (&inode->i_alloc_sem){--..}:
[ 2866.226784] [<c0441df1>] add_lock_to_list+0x67/0x8b
[ 2866.232525] [<c0444bb9>] __lock_acquire+0xb02/0xd36
[ 2866.238315] [<c0444e8b>] lock_acquire+0x9e/0xb8
[ 2866.243702] [<c043c0c5>] down_write+0x3e/0x77
[ 2866.248914] [<c0498b07>] notify_change+0xdf/0x2ec
[ 2866.254542] [<c0484161>] do_truncate+0x60/0x79
[ 2866.259927] [<c048d5fe>] may_open+0x1db/0x240
[ 2866.265165] [<c048fbbd>] open_namei+0x2d6/0x6bb
[ 2866.270602] [<c0483a5d>] do_filp_open+0x26/0x3b
[ 2866.275996] [<c0483acf>] do_sys_open+0x5d/0xed
[ 2866.281382] [<c0483b97>] sys_open+0x1c/0x1e
[ 2866.286508] [<c0404182>] sysenter_past_esp+0x5f/0x99
[ 2866.292428] [<b7f9d410>] 0xb7f9d410
[ 2866.296819] [<ffffffff>] 0xffffffff
[ 2866.301177]
[ 2866.301178] -> #1 (&sysfs_inode_imutex_key){--..}:
[ 2866.307632] [<c0441df1>] add_lock_to_list+0x67/0x8b
[ 2866.313425] [<c0444bb9>] __lock_acquire+0xb02/0xd36
[ 2866.319164] [<c0444e8b>] lock_acquire+0x9e/0xb8
[ 2866.324576] [<c065b745>] __mutex_lock_slowpath+0x107/0x369
[ 2866.331008] [<c065b9c3>] mutex_lock+0x1c/0x1f
[ 2866.336314] [<c04c2609>] create_dir+0x1e/0x1c2
[ 2866.341682] [<c04c280d>] sysfs_create_dir+0x60/0x7b
[ 2866.347396] [<c050a335>] kobject_shadow_add+0xd7/0x189
[ 2866.353499] [<c050a3f1>] kobject_add+0xa/0xc
[ 2866.358685] [<c0480f00>] sysfs_slab_add+0x10c/0x152
[ 2866.364374] [<c048111b>] kmem_cache_create+0x13a/0x1d4
[ 2866.370442] [<c083415d>] fasync_init+0x2e/0x37
[ 2866.375818] [<c0824542>] kernel_init+0x14e/0x2bf
[ 2866.381351] [<c0404e7b>] kernel_thread_helper+0x7/0x10
[ 2866.387419] [<ffffffff>] 0xffffffff
[ 2866.391843]
[ 2866.391845] -> #0 (slub_lock){----}:
[ 2866.397022] [<c0442b04>] print_circular_bug_tail+0x2e/0x68
[ 2866.403359] [<c0444aa5>] __lock_acquire+0x9ee/0xd36
[ 2866.409080] [<c0444e8b>] lock_acquire+0x9e/0xb8
[ 2866.414466] [<c043bfff>] down_read+0x3d/0x74
[ 2866.419635] [<c0482510>] kmem_cache_defrag+0x18/0xb3
[ 2866.425540] [<c046c7ac>] shrink_slab+0x1ca/0x1d5
[ 2866.431002] [<c046cc1d>] try_to_free_pages+0x178/0x224
[ 2866.437044] [<c046824f>] __alloc_pages+0x1cd/0x324
[ 2866.442794] [<c0465282>] find_or_create_page+0x5c/0xa6
[ 2866.448817] [<c04c9379>] ext3_truncate+0xbb/0x83b
[ 2866.454411] [<c0472470>] vmtruncate+0x11a/0x140
[ 2866.459762] [<c049894d>] inode_setattr+0x5c/0x137
[ 2866.465286] [<c04caafb>] ext3_setattr+0x19c/0x1f8
[ 2866.470835] [<c0498b61>] notify_change+0x139/0x2ec
[ 2866.476514] [<c0484161>] do_truncate+0x60/0x79
[ 2866.481822] [<c04842af>] do_sys_ftruncate+0x135/0x150
[ 2866.487778] [<c04842e5>] sys_ftruncate64+0x1b/0x1d
[ 2866.493405] [<c040420c>] syscall_call+0x7/0xb
[ 2866.498599] [<b7f10410>] 0xb7f10410
[ 2866.502913] [<ffffffff>] 0xffffffff
[ 2866.507201]
[ 2866.507203] other info that might help us debug this:
[ 2866.507204]
[ 2866.515363] 2 locks held by bash-shared-map/3245:
[ 2866.520151] #0: (&inode->i_mutex){--..}, at: [<c065b9c3>] mutex_lock+0x1c/0x1f
[ 2866.527826] #1: (&inode->i_alloc_sem){--..}, at: [<c0498b07>] notify_change+0xdf/0x2ec
[ 2866.536158]
[ 2866.536160] stack backtrace:
[ 2866.540597] [<c04052ad>] dump_trace+0x63/0x1eb
[ 2866.545187] [<c040544f>] show_trace_log_lvl+0x1a/0x2f
[ 2866.550426] [<c040608d>] show_trace+0x12/0x14
[ 2866.555005] [<c04060a5>] dump_stack+0x16/0x18
[ 2866.559552] [<c0442b35>] print_circular_bug_tail+0x5f/0x68
[ 2866.565216] [<c0444aa5>] __lock_acquire+0x9ee/0xd36
[ 2866.570264] [<c0444e8b>] lock_acquire+0x9e/0xb8
[ 2866.574991] [<c043bfff>] down_read+0x3d/0x74
[ 2866.579487] [<c0482510>] kmem_cache_defrag+0x18/0xb3
[ 2866.584664] [<c046c7ac>] shrink_slab+0x1ca/0x1d5
[ 2866.589462] [<c046cc1d>] try_to_free_pages+0x178/0x224
[ 2866.594796] [<c046824f>] __alloc_pages+0x1cd/0x324
[ 2866.599800] [<c0465282>] find_or_create_page+0x5c/0xa6
[ 2866.605099] [<c04c9379>] ext3_truncate+0xbb/0x83b
[ 2866.609974] [<c0472470>] vmtruncate+0x11a/0x140
[ 2866.614695] [<c049894d>] inode_setattr+0x5c/0x137
[ 2866.619578] [<c04caafb>] ext3_setattr+0x19c/0x1f8
[ 2866.624470] [<c0498b61>] notify_change+0x139/0x2ec
[ 2866.629441] [<c0484161>] do_truncate+0x60/0x79
[ 2866.634075] [<c04842af>] do_sys_ftruncate+0x135/0x150
[ 2866.639339] [<c04842e5>] sys_ftruncate64+0x1b/0x1d
[ 2866.644310] [<c040420c>] syscall_call+0x7/0xb
[ 2866.648823] [<b7f10410>] 0xb7f10410
[ 2866.652482] =======================

http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc4-mm2-sd3/sd-dmesg
http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.22-rc4-mm2-sd3/sd-config

Regards,
Michal

--
"Najbardziej brakowało mi twojego milczenia."
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