From: Theodore Ts'o <tytso@mit.edu>
To: linux-ext4@vger.kernel.org
Cc: Theodore Ts'o <tytso@mit.edu>
Subject: [PATCH] ext4: Fix potential inode allocation soft lockup in Orlov allocator
Date: Wed, 22 Apr 2009 21:30:57 -0400 [thread overview]
Message-ID: <1240450257-26045-1-git-send-email-tytso@mit.edu> (raw)
If the Orlov allocator is having trouble finding an appropriate block
group, the fallback code could loop forever, causing a soft lockup
warning in find_group_orlov():
BUG: soft lockup - CPU#0 stuck for 61s! [cp:11728]
...
Pid: 11728, comm: cp Not tainted (2.6.30-rc1-dirty #77) Lenovo
EIP: 0060:[<c021650e>] EFLAGS: 00000246 CPU: 0
EIP is at ext4_get_group_desc+0x54/0x9d
...
Call Trace:
[<c0218021>] find_group_orlov+0x2ee/0x334
[<c0120a5f>] ? sched_clock+0x8/0xb
[<c02188e3>] ext4_new_inode+0x2cf/0xb1a
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/ialloc.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index cbce5aa..f18e0a0 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -585,6 +585,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
fallback:
ngroups = sbi->s_groups_count;
avefreei = freei / ngroups;
+fallback_retry:
parent_group = EXT4_I(parent)->i_block_group;
for (i = 0; i < ngroups; i++) {
grp = (parent_group + i) % ngroups;
@@ -602,7 +603,7 @@ fallback:
* filesystems the above test can fail to find any blockgroups
*/
avefreei = 0;
- goto fallback;
+ goto fallback_retry;
}
return -1;
--
1.5.6.3
reply other threads:[~2009-04-23 1:31 UTC|newest]
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