[Ocfs2-devel] kernel BUG in function ocfs2_truncate_file
Gang He
ghe at suse.com
Thu Apr 21 02:50:30 PDT 2016
>>>
> 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.
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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