[linux-cifs-client] when a mounted remote smb server goes down - cifs vfs tries to re-connect - with strange side-effects
Günter Kukkukk
linux at kukkukk.com
Mon Jan 4 21:24:43 MST 2010
Hi Jeff, Steve, ...
I'm running here on opensuse 11.2 - tried default kernel - and now 2.6.33-rc2-0.1-default from latest cifs git.
When mounting a remote smb server - and then that server goes down (just shutdown, no network cable unplugged),
my client KDE4.x desktop becomes _very_ unresponsive - the (kicker) taskbar is now _unusable_ - no response
at all - which also means that a user can't even use the GUI to shutdown.
As soon i restart the remote smb server, all is fine again.
Used many tools (like those from sysstat) - but at least CPU usage seem to be _not_ the problem.
Could it be some kernel semaphores....?
When the remote server is down, wireshark only shows some 3 seconds tcp/ip traffic on ports 139 and 445.
From the cifs (debug 7) kernel log:
Jan 5 04:38:01 linux300 kernel: [46253.309431] fs/cifs/inode.c: Getting info on //linux700/homegk
Jan 5 04:38:01 linux300 kernel: [46253.309438] fs/cifs/cifssmb.c: In QPathInfo (Unix) the path //linux700/homegk
Jan 5 04:38:04 linux300 kernel: [46256.080085] fs/cifs/connect.c: Socket created
Jan 5 04:38:04 linux300 kernel: [46256.080740] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:04 linux300 kernel: [46256.080770] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:07 linux300 kernel: [46259.084106] fs/cifs/connect.c: Socket created
Jan 5 04:38:07 linux300 kernel: [46259.084773] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:07 linux300 kernel: [46259.084804] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:10 linux300 kernel: [46262.088085] fs/cifs/connect.c: Socket created
Jan 5 04:38:10 linux300 kernel: [46262.088728] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:10 linux300 kernel: [46262.088758] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:11 linux300 kernel: [46263.308062] fs/cifs/cifssmb.c: gave up waiting on reconnect in smb_init
Jan 5 04:38:11 linux300 kernel: [46263.308082] fs/cifs/inode.c: error on getting revalidate info -112
Jan 5 04:38:11 linux300 kernel: [46263.308090] fs/cifs/inode.c: cifs_revalidate - inode unchanged
Jan 5 04:38:11 linux300 kernel: [46263.308102] fs/cifs/inode.c: CIFS VFS: leaving cifs_revalidate (xid = 224) rc =
-112
Jan 5 04:38:11 linux300 kernel: [46263.310204] fs/cifs/inode.c: CIFS VFS: in cifs_revalidate as Xid: 225 with uid:
1000
Jan 5 04:38:11 linux300 kernel: [46263.310226] fs/cifs/inode.c: Revalidate: //linux700/homegk inode 0xf41c3e84 count 1
dentry: 0xdaa7325c d_time 1951477551 jiffies 11490827
Jan 5 04:38:11 linux300 kernel: [46263.310236] fs/cifs/inode.c: Getting info on //linux700/homegk
Jan 5 04:38:11 linux300 kernel: [46263.310243] fs/cifs/cifssmb.c: In QPathInfo (Unix) the path //linux700/homegk
Jan 5 04:38:13 linux300 kernel: [46265.092103] fs/cifs/connect.c: Socket created
Jan 5 04:38:13 linux300 kernel: [46265.092744] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:13 linux300 kernel: [46265.092774] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:16 linux300 kernel: [46268.096101] fs/cifs/connect.c: Socket created
Jan 5 04:38:16 linux300 kernel: [46268.096751] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:16 linux300 kernel: [46268.096781] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:19 linux300 kernel: [46271.100088] fs/cifs/connect.c: Socket created
Jan 5 04:38:19 linux300 kernel: [46271.100729] fs/cifs/connect.c: Error -111 connecting to server via ipv4
Jan 5 04:38:19 linux300 kernel: [46271.100758] fs/cifs/connect.c: reconnect error -111
Jan 5 04:38:21 linux300 kernel: [46273.308054] fs/cifs/cifssmb.c: gave up waiting on reconnect in smb_init
Jan 5 04:38:21 linux300 kernel: [46273.308075] fs/cifs/inode.c: error on getting revalidate info -112
Jan 5 04:38:21 linux300 kernel: [46273.308083] fs/cifs/inode.c: cifs_revalidate - inode unchanged
Jan 5 04:38:21 linux300 kernel: [46273.308097] fs/cifs/inode.c: CIFS VFS: leaving cifs_revalidate (xid = 225) rc =
-112
Jan 5 04:38:21 linux300 kernel: [46273.311877] fs/cifs/inode.c: CIFS VFS: in cifs_revalidate as Xid: 226 with uid:
1000
Jan 5 04:38:21 linux300 kernel: [46273.311901] fs/cifs/inode.c: Revalidate: //linux700/homegk inode 0xf41c3e84 count 1
dentry: 0xdaa7325c d_time 1951477551 jiffies 11493327
Jan 5 04:38:21 linux300 kernel: [46273.311912] fs/cifs/inode.c: Getting info on //linux700/homegk
Cheers, Günter
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