Re: [PATCH 0/10] pnfs-submit add layoutget,layoutreturn error handling version 2

[Benny Halevy <bhalevy@panasas.com>]

On Jun. 28, 2010, 19:44 +0300, Andy Adamson <andros@netapp.com> wrote:
> Hi Benny
> 
> I have not been able to reproduce this BUG. I've tried against the  
> files pyNFS server with return_on_close False as well a True, and  
> against a GFS2/pNFS cluster with write layouts turned on.
> 
> Patch 0003-SQUASHME-pnfs-submit-clear-page-lseg-on-partial-i-o.patch  
> calls put_lseg when I/O to a DS fails. I tested this using the pyNFS  
> files layout server and blocking the DS with iptables. I think this is  
> the only change in this patch set that would affect the refcounting.
> 
> Are you able to reproduce the BUG?

The easiest way I found to reproduce this bug is running the cthon tests
on a locally mounted file system exported over PNFSD_LOCAL_EXPORT.
The test machine is a dual core SMP machine.
Are you testing over a VM?  Is it uni-processor?

Benny

> 
> -->Andy
> 
> On Jun 24, 2010, at 1:02 PM, William A. (Andy) Adamson wrote:
> 
>> OK - I'll look into it.
>>
>> Sorry I missed today's pNFS call.
>>
>> -->Andy
>>
>> On Thu, Jun 24, 2010 at 9:14 AM, Benny Halevy <bhalevy@panasas.com>  
>> wrote:
>>> On Jun. 23, 2010, 22:21 +0300, andros@netapp.com wrote:
>>>> Responded to comments, added a 2 cleanup patchses
>>>>
>>>> Plus some code cleanup
>>>> 0001-SQUASHME-pnfs-submit-remove-unused-filelayout_mount_.patch
>>>>
>>>> and some bug fixes
>>>> 0002-SQUASHME-pnfs-submit-pnfs_try_to_read-write-commit-u.patch
>>>>
>>>> NOTE: this patch: 0003-SQUASHME-pnfs-submit-tell-commit-to-use-the- 
>>>> MDS.patch
>>>> was replaced by:
>>>> 0003-SQUASHME-pnfs-submit-clear-page-lseg-on-partial-i-o.patch
>>>>
>>>>
>>>> Remove unused (by file layout) encode_layoutreturn io operation
>>>> 0004-SQUASHME-pnfs-submit-remove-encode_layoutreturn.patch
>>>> 0005-SQUASHME-pnfs-submit-add-error-handling-to-layout-re.patch
>>>>
>>>> 0006-SQUASHME-pnfs-submit-handle-assassinated-layoutcommi.patch
>>>>
>>>> Note: pnfs4_proc_layoutget is only called by send_layout() which  
>>>> prints
>>>> the status.
>>>> 0007-SQUASHME-pnfs-submit-add-error-handlers-to-layout-ge.patch
>>>>
>>>> Add back encode_layoutreturn io operation
>>>> 0008-pnfs-post-submit-restore-encode_layoutreturn.patch
>>>>
>>>>
>>>> New patches:
>>>> 0009-SQUASHME-pnfs-submit-don-t-re-initialize-i_lock.patch
>>>>
>>>> This gets rid of a frame stack warning;
>>>> 0010-SQUASHME-pnfs-submit-remove-struct-nfs_server-from-s.patch
>>>>
>>>> Testing:
>>>> ---------
>>>>
>>>> CONFIG_NFS_V4_1 set: NFSv4.0 NFSv4.1 pNFS
>>>> Passes Connectathon tests
>>>>
>>>> Tested layoutget and layoutreturn recovery from  
>>>> NFS4ERR_DEAD_SESSION with the
>>>> pyNFS server and the testclient framework.
>>>>
>>>> Still todo:
>>>>
>>>> Recover from NFS4ERR_BAD_STATEID. Currently layoutreturn,  
>>>> layoutget, and
>>>> layoutcommit do not pass nfs_stste to the error handlers.
>>>>
>>>> Handle NFS4ERR_BAD_LAYOUT.
>>>>
>>>> CONFIG_NFS_V4_1 not set: NFSv4.o mount passes cthon tests.
>>>>
>>>> -->Andy
>>>
>>> Andy, I've hit
>>>       BUG_ON(lo->refcount <= 0);
>>> in put_layout() with this patchset.
>>> I'm not sure if it introduced it or not, still investigating...
>>>
>>> Jun 24 12:07:26 tl2 kernel: pnfs_destroy_inode: WARNING:  
>>> layout.refcount 1
>>> Jun 24 12:07:26 tl2 kernel: ------------[ cut here ]------------
>>> Jun 24 12:07:26 tl2 kernel: kernel BUG at /usr0/export/dev/bhalevy/ 
>>> git/linux-pnfs-bh-nfs41/fs/nfs/pnfs.c:341!
>>> Jun 24 12:07:26 tl2 kernel: invalid opcode: 0000 [#1] SMP  
>>> DEBUG_PAGEALLOC
>>> Jun 24 12:07:26 tl2 kernel: last sysfs file: /sys/module/nfs/ 
>>> initstate
>>> Jun 24 12:07:26 tl2 kernel: CPU 1
>>> Jun 24 12:07:26 tl2 kernel: Modules linked in: nfslayoutdriver nfsd  
>>> exportfs nfs lockd nfs_acl auth_rpcgss sunrpc osd libosd autofs4  
>>> crc32c ipv6 iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi  
>>> cpufreq_ondemand acpi_cpufreq freq_table mperf ext3 jbd dm_mirror  
>>> dm_region_hash dm_log dm_multipath dm_mod kvm_intel kvm  
>>> snd_hda_codec_realtek i915 drm_kms_helper drm snd_hda_intel  
>>> snd_hda_codec snd_hwdep i2c_algo_bit snd_seq i2c_i801 i2c_core  
>>> snd_seq_device snd_pcm r8169 mii snd_timer sr_mod snd soundcore  
>>> snd_page_alloc button video output rng_core sg cdrom ata_generic  
>>> ata_piix libata sd_mod scsi_mod ext4 mbcache jbd2 crc16 uhci_hcd  
>>> ohci_hcd ehci_hcd [last unloaded: microcode]
>>> Jun 24 12:07:26 tl2 kernel:
>>> Jun 24 12:07:26 tl2 kernel: Pid: 1920, comm: rpciod/1 Not tainted  
>>> 2.6.35-rc3-pnfs+ #54 G31M4 (MS-7527)/MS-7527
>>> Jun 24 12:07:26 tl2 kernel: RIP: 0010:[<ffffffffa05d0ea4>]   
>>> [<ffffffffa05d0ea4>] put_layout+0x2f/0xa7 [nfs]
>>> Jun 24 12:07:26 tl2 kernel: RSP: 0018:ffff88007525dd20  EFLAGS:  
>>> 00010246
>>> Jun 24 12:07:26 tl2 kernel: RAX: 0000000000000000 RBX:  
>>> ffff8800704b6b78 RCX: 0000000000000066
>>> Jun 24 12:07:26 tl2 kernel: RDX: ffff8800704b69a8 RSI:  
>>> ffffea0001b931a8 RDI: ffff8800704b6b78
>>> Jun 24 12:07:26 tl2 kernel: RBP: ffff88007525dd30 R08:  
>>> 0000000000000000 R09: ffff88007356a500
>>> Jun 24 12:07:26 tl2 kernel: R10: ffff88007525dd80 R11:  
>>> 0000000000000003 R12: ffff8800704b69a8
>>> Jun 24 12:07:26 tl2 kernel: R13: ffff880073854f00 R14:  
>>> ffff88007356a508 R15: ffff88007356a590
>>> Jun 24 12:07:26 tl2 kernel: FS:  0000000000000000(0000)  
>>> GS:ffff880001a80000(0000) knlGS:0000000000000000
>>> Jun 24 12:07:26 tl2 kernel: CS:  0010 DS: 0000 ES: 0000 CR0:  
>>> 000000008005003b
>>> Jun 24 12:07:26 tl2 kernel: CR2: 0000003944279000 CR3:  
>>> 0000000001698000 CR4: 00000000000406e0
>>> Jun 24 12:07:26 tl2 kernel: DR0: 0000000000000000 DR1:  
>>> 0000000000000000 DR2: 0000000000000000
>>> Jun 24 12:07:26 tl2 kernel: DR3: 0000000000000000 DR6:  
>>> 00000000ffff0ff0 DR7: 0000000000000400
>>> Jun 24 12:07:26 tl2 kernel: Process rpciod/1 (pid: 1920, threadinfo  
>>> ffff88007525c000, task ffff88007d988000)
>>> Jun 24 12:07:26 tl2 kernel: Stack:
>>> Jun 24 12:07:26 tl2 kernel: ffff8800704b6b78 ffff8800704b69a8  
>>> ffff88007525dd60 ffffffffa05d203f
>>> Jun 24 12:07:26 tl2 kernel: <0> ffff88007525dd60 ffff880073854f18  
>>> ffff880073854f00 ffffffffa05d5880
>>> Jun 24 12:07:26 tl2 kernel: <0> ffff88007525dd80 ffffffffa05bfb5c  
>>> ffff88007525dd90 ffff88007356a500
>>> Jun 24 12:07:26 tl2 kernel: Call Trace:
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa05d203f>] pnfs_layout_release 
>>> +0x43/0x68 [nfs]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa05bfb5c>]  
>>> nfs4_pnfs_layoutreturn_release+0x61/0x8b [nfs]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa056207d>]  
>>> rpc_release_calldata+0x17/0x19 [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa05621bd>] rpc_free_task+0x5e/ 
>>> 0x66 [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa056225d>] rpc_put_task 
>>> +0x98/0x9c [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa0562ea7>] __rpc_execute 
>>> +0x205/0x212 [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa0562ef0>] rpc_async_schedule 
>>> +0x15/0x17 [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81052cb7>] worker_thread 
>>> +0x1aa/0x23b
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffffa0562edb>] ?  
>>> rpc_async_schedule+0x0/0x17 [sunrpc]
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81056ab7>] ?  
>>> autoremove_wake_function+0x0/0x39
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff8102f96d>] ?  
>>> spin_unlock_irqrestore+0xe/0x10
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81052b0d>] ? worker_thread 
>>> +0x0/0x23b
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81056645>] kthread+0x7f/0x87
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81003a24>]  
>>> kernel_thread_helper+0x4/0x10
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff810565c6>] ? kthread+0x0/0x87
>>> Jun 24 12:07:26 tl2 kernel: [<ffffffff81003a20>] ?  
>>> kernel_thread_helper+0x0/0x10
>>> Jun 24 12:07:26 tl2 kernel: Code: 41 54 53 0f 1f 44 00 00 8b 87 24  
>>> 01 00 00 48 89 fb 48 8d 97 30 fe ff ff 89 c1 c1 f9 08 38 c1 75 04  
>>> 0f 0b eb fe 8b 07 85 c0 7f 04 <0f> 0b eb fe ff c8 85 c0 89 07 75 67  
>>> 48 8b 82 48 03 00 00 f6 05
>>> Jun 24 12:07:26 tl2 kernel: RIP  [<ffffffffa05d0ea4>] put_layout 
>>> +0x2f/0xa7 [nfs]
>>> Jun 24 12:07:27 tl2 kernel: RSP <ffff88007525dd20>
>>> Jun 24 12:07:27 tl2 kernel: ---[ end trace 0468384c0ab45a1f ]---
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