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Old 09-27-2007, 02:50 PM   #1
LQ Newbie
Registered: Nov 2002
Location: Stockholm
Posts: 27

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Stack dump during rsync -e ssh ... heavy load!


I'm running Debian "Lenny" on one of my file servers.

The following appears in the system log while I am
copying large sets of data. Any ideas what could be
causing this? NFS related? sftp? Memory corruption?
The network speed is ~40MB/s (encrypted drives) so the
file server is loaded!

Pid: 4186, comm: sftp-server Not tainted 2.6.21-2-amd64 #1
RIP: 0010:[<ffffffff882f7915>]  [<ffffffff882f7915>] :nfs:nfs_lookup+0x10d/0x26
RSP: 0018:ffff81005ace3938  EFLAGS: 00010246
RAX: ffff8100661fb000 RBX: ffff810057767f20 RCX: 000000000000fd00
RDX: 0000000000004000 RSI: 0000000000000000 RDI: ffff810066437d90
RBP: 0000000000000000 R08: 00000001000a76ef R09: ffff810066b2e000
R10: ffff810066216318 R11: ffffffff883076b9 R12: ffffffffffffffdc
R13: ffff810066437d90 R14: 0000000000000000 R15: ffff810066437d90
FS:  0000000000595860(0063) GS:ffffffff804d7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000008 CR3: 0000000058ba2000 CR4: 00000000000006e0
Process sftp-server (pid: 4186, threadinfo ffff81005ace2000, task ffff81003792a
Stack:  0000000000040006 ffff81000000db60 ffff81003792ae20 0000000000000000
 0000000000000000 ffffffff8020e0e9 000081a400000001 0000000000000001
 ffff810000000000 00000000d3300000 00000000d364e000 0000000000000000
Call Trace:
 [<ffffffff8020e0e9>] __alloc_pages+0x5a/0x2bc
 [<ffffffff8021588a>] cache_grow+0x1f4/0x248
 [<ffffffff80253f62>] cache_alloc_refill+0xcc/0x1cc
 [<ffffffff802209b9>] d_alloc+0x15b/0x1ac
 [<ffffffff80232cd4>] __lookup_hash+0xfb/0x120
 [<ffffffff802bce17>] lookup_one_len+0x54/0x62
 [<ffffffff883a6cfd>] :unionfs:unionfs_lookup_backend+0x32b/0x81a
 [<ffffffff88305d14>] :nfs:nfs3_xdr_accessres+0x0/0x41
 [<ffffffff80253f62>] cache_alloc_refill+0xcc/0x1cc
 [<ffffffff8020c661>] do_lookup+0xc4/0x1ae
 [<ffffffff80209715>] __link_path_walk+0x8ec/0xd9d
 [<ffffffff8020df8a>] link_path_walk+0x58/0xe0
 [<ffffffff8028c60a>] autoremove_wake_function+0x0/0x2e
 [<ffffffff80259c4c>] thread_return+0x0/0xed
 [<ffffffff8020c46e>] do_path_lookup+0x1b3/0x1d6
 [<ffffffff80210ab5>] getname+0x152/0x196
 [<ffffffff802219df>] __user_walk_fd+0x37/0x53
 [<ffffffff8023af45>] vfs_lstat_fd+0x18/0x47
 [<ffffffff8028c60a>] autoremove_wake_function+0x0/0x2e
 [<ffffffff80259c4c>] thread_return+0x0/0xed
 [<ffffffff802282f4>] sys_newlstat+0x19/0x31
 [<ffffffff8020ff21>] sys_read+0x45/0x6e
 [<ffffffff8025511e>] system_call+0x7e/0x83

Code: 48 8b 55 08 48 8b b8 40 02 00 00 48 39 8f b8 00 00 00 48 8d 
RIP  [<ffffffff882f7915>] :nfs:nfs_lookup+0x10d/0x262
 RSP <ffff81005ace3938>
CR2: 0000000000000008
Old 09-27-2007, 07:41 PM   #2
LQ Newbie
Registered: Nov 2002
Location: Stockholm
Posts: 27

Original Poster
Rep: Reputation: 15
Originally Posted by holst View Post

I'm running Debian "Lenny" on one of my file servers.

It was the DAMN unionfs crashing my NFS shares. I truly HATE unionfs, it's developers should burn... also, try mounting a brach in "nfsro" or something. It won't work, because the tool can't parse options if the survival of mankind depended on it. *sigh*

BTW, don't try it. Instead do something with your day.


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