[Ocfs2-devel] kernel BUG in function ocfs2_truncate_file
Joseph Qi
joseph.qi at huawei.com
Thu Apr 21 05:22:25 PDT 2016
Hi Gang,
On 2016/4/21 17:50, Gang He wrote:
>
>
>
>>>>
>> Hi Gang,
>> May be. If so, it seems that it has relations with locks.
>> Can we know which data is newer?
> Hi Joseph, I do not get your question.
> About this bug, the customer only have a panic message, no message/kernel dump is provided.
>
Filesystem not corrupted doesn't mean the disk inode is right (the latest).
That means the in-memory inode may be right but happens that flush hasn't
been done successfully.
But as of now, we can't distinguish which the case is.
Thanks,
Joseph
>
> Thanks
> Gang
>
>>
>> Thanks,
>> Joseph
>>
>> On 2016/4/21 15:59, Gang He wrote:
>>> Hello Guys,
>>>
>>> Sorry for delayed reply, the fsck log was reported from the customer.
>>> OCFS2 volumes to check are:
>>> /dev/dm-11 83886080 44540260 39345820 54% /sapmnt
>>> /dev/dm-14 62914560 15374960 47539600 25% /usr/sap
>>> /dev/dm-13 89128960 19976272 69152688 23%
>> /usr/sap/trans
>>> uii316:~ # fsck.ocfs2 /dev/dm-13
>>> fsck.ocfs2 1.8.2
>>> Checking OCFS2 filesystem in /dev/dm-13:
>>> Label: <NONE>
>>> UUID: E35AF95C8114494391E0FFDEFD07309B
>>> Number of blocks: 22282240
>>> Block size: 4096
>>> Number of clusters: 22282240
>>> Cluster size: 4096
>>> Number of slots: 2
>>> /dev/dm-13 is clean. It will be checked after 20 additional mounts.
>>> uii316:~ # fsck.ocfs2 /dev/dm-14
>>> fsck.ocfs2 1.8.2
>>> Checking OCFS2 filesystem in /dev/dm-14:
>>> Label: <NONE>
>>> UUID: 43F2D9C8D70B47388527075F3C6C38BB
>>> Number of blocks: 15728640
>>> Block size: 4096
>>> Number of clusters: 15728640
>>> Cluster size: 4096
>>> Number of slots: 2
>>> /dev/dm-14 is clean. It will be checked after 20 additional mounts.
>>> uii316:~ # fsck.ocfs2 /dev/dm-11
>>> fsck.ocfs2 1.8.2
>>> Checking OCFS2 filesystem in /dev/dm-11:
>>> Label: <NONE>
>>> UUID: 0F1CBE6017934B5E8AD80149ED332659
>>> Number of blocks: 20971520
>>> Block size: 4096
>>> Number of clusters: 20971520
>>> Cluster size: 4096
>>> Number of slots: 2
>>> /dev/dm-11 is clean. It will be checked after 20 additional mounts.
>>>
>>> >From the log, it looks the file systems were not corrupted, this should be a
>> race-condition issue ?!
>>>
>>> Thanks
>>> Gang
>>>
>>>
>>>>>>
>>>> On 03/31/2016 10:56 AM, Gang He wrote:
>>>>> Hello Joseph and Junxiao,
>>>>>
>>>>> Did you encounter this issue in the past? I doubt this is possible a race
>>>> condition bug (rather than data inconsistency).
>>>> Never saw this. fsck report any corruption?
>>>>
>>>> Thanks,
>>>> Junxiao.
>>>>>
>>>>> Thanks
>>>>> Gang
>>>>>
>>>>>
>>>>>>>>
>>>>>> Hello Guys,
>>>>>>
>>>>>> I got a bug, which reported a kernel BUG in function ocfs2_truncate_file,
>>>>>> Base on my initial analysis, this bug looks like a race condition problem.
>>>>>> Unfortunately, there was no kernel crash dump caught, just got some kernel
>>>>>> log as below,
>>>>>>
>>>>>> kernel BUG at /usr/src/packages/BUILD/ocfs2-1.6/default/ocfs2/file.c:466!
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831230] Supported: Yes
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831234]
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831238] Pid: 7134, comm: saposcol Not tainted
>>>>>> 3.0.101-0.47.67-default #1
>>>>>> Oct 21 13:02:19 uii316 HP ProLiant BL460c G1
>>>>>> Oct 21 13:02:19 uii316
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831247] RIP: 0010:[<ffffffffa0744b95>]
>>>>>> Oct 21 13:02:19 uii316 [<ffffffffa0744b95>] ocfs2_truncate_file+0xa5/0x490
>>>>>> [ocfs2]
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831312] RSP: 0018:ffff880f39d79b68 EFLAGS:
>>>>>> 00010296
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831321] RAX: 000000000000008f RBX:
>>>>>> ffff880f39c5e240 RCX: 00000000000039fd
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831326] RDX: 0000000000000000 RSI:
>>>>>> 0000000000000007 RDI: 0000000000000246
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831331] RBP: 1000000000000000 R08:
>>>>>> ffffffff81da0ac0 R09: 0000000000000000
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831336] R10: 0000000000000003 R11:
>>>>>> 00000000ffffffff R12: ffff880f3949bc78
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831342] R13: ffff880f39c5e888 R14:
>>>>>> ffff880f3d481000 R15: 00000000000e43bc
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831347] FS: 00007f11cda9d720(0000)
>>>>>> GS:ffff880fefd40000(0000) knlGS:0000000000000000
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831353] CS: 0010 DS: 0000 ES: 0000 CR0:
>>>>>> 0000000080050033
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831358] CR2: 00007f11cdad4000 CR3:
>>>>>> 0000000f39d35000 CR4: 00000000000007e0
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831363] DR0: 0000000000000000 DR1:
>>>>>> 0000000000000000 DR2: 0000000000000000
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831368] DR3: 0000000000000000 DR6:
>>>>>> 00000000ffff0ff0 DR7: 0000000000000400
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831374] Process saposcol (pid: 7134,
>>>>>> threadinfo ffff880f39d78000, task ffff880f39c5e240)
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831379] Stack:
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831383] 000000000002433c
>>>>>> Oct 21 13:02:19 uii316 00000000000e43bc
>>>>>> Oct 21 13:02:19 uii316 00000000000eab40
>>>>>> Oct 21 13:02:19 uii316 ffff880f00000001
>>>>>> Oct 21 13:02:19 uii316
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831397] ffff880f394956e0
>>>>>> Oct 21 13:02:19 uii316 ffff880f8e0d1000
>>>>>> Oct 21 13:02:19 uii316 ffff880f3949b800
>>>>>> Oct 21 13:02:19 uii316 0000000000000000
>>>>>> Oct 21 13:02:19 uii316
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831410] ffff880f39454980
>>>>>> Oct 21 13:02:19 uii316 0000000000000001
>>>>>> Oct 21 13:02:19 uii316 000000000002433c
>>>>>> Oct 21 13:02:19 uii316 0000000000000008
>>>>>> Oct 21 13:02:19 uii316
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831423] Call Trace:
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831492] [<ffffffffa074742e>]
>>>>>> ocfs2_setattr+0x26e/0xa90 [ocfs2]
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831522] [<ffffffff81178faf>]
>>>>>> notify_change+0x19f/0x2f0
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831534] [<ffffffff8115d517>]
>>>>>> do_truncate+0x57/0x80
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831544] [<ffffffff8116c053>]
>>>>>> do_last+0x603/0x800
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831551] [<ffffffff8116ceb9>]
>>>>>> path_openat+0xd9/0x420
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831558] [<ffffffff8116d33c>]
>>>>>> do_filp_open+0x4c/0xc0
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831566] [<ffffffff8115de5f>]
>>>>>> do_sys_open+0x17f/0x250
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831575] [<ffffffff8146e1f2>]
>>>>>> system_call_fastpath+0x16/0x1b
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831588] [<00007f11ccb07080>] 0x7f11ccb0707f
>>>>>> Oct 21 13:02:19 uii316 [ 1766.831592] Code:
>>>>>>
>>>>>> The source code in question is as below,
>>>>>> 444 static int ocfs2_truncate_file(struct inode *inode,
>>>>>> 445 struct buffer_head *di_bh,
>>>>>> 446 u64 new_i_size)
>>>>>> 447 {
>>>>>> 448 int status = 0;
>>>>>> 449 struct ocfs2_dinode *fe = NULL;
>>>>>> 450 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
>>>>>> 451
>>>>>> 452 /* We trust di_bh because it comes from ocfs2_inode_lock(),
>>>>>> which
>>>>>> 453 * already validated it */
>>>>>> 454 fe = (struct ocfs2_dinode *) di_bh->b_data;
>>>>>> 455
>>>>>> 456 trace_ocfs2_truncate_file((unsigned long
>>>>>> long)OCFS2_I(inode)->ip_blkno,
>>>>>> 457 (unsigned long
>>>>>> long)le64_to_cpu(fe->i_size),
>>>>>> 458 (unsigned long long)new_i_size);
>>>>>> 459
>>>>>> 460 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
>>
>>>>
>>>>>> <<= here
>>>>>> 461 "Inode %llu, inode i_size = %lld != di "
>>>>>> 462 "i_size = %llu, i_flags = 0x%x\n",
>>>>>> 463 (unsigned long long)OCFS2_I(inode)->ip_blkno,
>>>>>> 464 i_size_read(inode),
>>>>>> 465 (unsigned long long)le64_to_cpu(fe->i_size),
>>>>>> 466 le32_to_cpu(fe->i_flags));
>>>>>> 467
>>>>>>
>>>>>> If your encountered the similar issue in the past, please let me know, to
>>>>>> see if there is any patch/discussion for this bug.
>>>>>>
>>>>>> Thanks a lot.
>>>>>> Gang
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Ocfs2-devel mailing list
>>>>>> Ocfs2-devel at oss.oracle.com
>>>>>> https://oss.oracle.com/mailman/listinfo/ocfs2-devel
>>>
>>> .
>>>
>
> .
>
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