Any chance you could get a wireshark or netmon trace (excerpt) of the high cpu activity (assuming a request is being resent repeatedly during this interval) - otherwise might be able to clear the kernel log, enable maximal cifs logging (by echoing 7 into /proc/fs/cifs/DebugData see - https://wiki.samba.org/index.php/LinuxCIFS_troubleshooting) and get a better feel for what is going on in that interval. Problem is that given how old the kernel is (more than 5 years old) - it is missing a lot of cleanup and improvements. On Fri, Jan 9, 2015 at 1:07 PM, Austin Barton <abarton@xxxxxx> wrote: > Hello, > > I'm looking for some assistance with my mount.cifs issue. > > A Windows share is mounted with cifs (rw). At some point a process > using the mount "stalls". Afterwards mount.cifs is consistently shown > as the highest item within top having %CPU at approximately 35. The > process (service) using the mount will not shutdown with init.d and > must be killed. Outside of the process I'm able to read, list, write > (w/content), and delete from the mount in question. Please note in the > "Display Internal CIFS Data Structures for Debugging" below only line > items 1 and 2 relate to the mount in question. > > ------------------------------ > ------------------------------------------------------------------------------------------------------------------ > > CentOS release 6.5 (Final) > kernal version: 2.6.32-431.11.2.el6.x86_64 > mount.cifs version: 4.8.1 > > > Display Internal CIFS Data Structures for Debugging > --------------------------------------------------- > CIFS Version 1.68 > Active VFS Requests: 1 > Servers: > 1) Name: 10.200.40.132 Domain: I3 Uses: 1 OS: Windows 7 Professional > 7601 Service Pack 1 > NOS: Windows 7 Professional 6.1 Capability: 0x1e3fc > SMB session status: 1 TCP status: 4 > Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0 > Shares: > 1) \\host.domain\share Mounts: 1 Type: NTFS DevInfo: 0x20 > Attributes: 0xc700ff > PathComponentMax: 255 Status: 0x1 type: DISK DISCONNECTED > > MIDs: > > 2) Name: 10.200.40.132 Domain: I3 Uses: 1 OS: Windows 7 Professional > 7601 Service Pack 1 > NOS: Windows 7 Professional 6.1 Capability: 0x1e3fc > SMB session status: 1 TCP status: 3 > Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0 > Shares: > 1) \\host.domain\share Mounts: 1 Type: NTFS DevInfo: 0x20 > Attributes: 0xc700ff > PathComponentMax: 255 Status: 0x1 type: DISK DISCONNECTED > > MIDs: > > > 3) Name: 10.200.20.105 Domain: I3 Uses: 1 OS: SpinStream2 > NOS: Windows 2000 Lan Manager Capability: 0xd2fc > SMB session status: 1 TCP status: 1 > Local Users To Server: 1 SecMode: 0x3 Req On Wire: 0 > Shares: > 1) \\host2.domain\share Mounts: 1 Type: NTFS DevInfo: 0x20 > Attributes: 0x4004f > PathComponentMax: 255 Status: 0x1 type: DISK > > MIDs: > > > When the stack is inspected it consistently reports the following: > > [user@host ~]$ sudo cat /proc/10410/stack > [<ffffffffa01a5171>] wait_for_response+0xf1/0x130 [cifs] > [<ffffffffa01a5eb4>] SendReceive+0x154/0x350 [cifs] > [<ffffffffa018b13e>] CIFSGetDFSRefer+0x23e/0x670 [cifs] > [<ffffffffa0194ba5>] get_dfs_path+0x65/0x190 [cifs] > [<ffffffffa0194dbf>] expand_dfs_referral+0xef/0x2c0 [cifs] > [<ffffffffa0195314>] cifs_mount+0x384/0x690 [cifs] > [<ffffffffa018236f>] cifs_get_sb+0xaf/0x2a0 [cifs] > [<ffffffff8118b8cb>] vfs_kern_mount+0x7b/0x1b0 > [<ffffffff8118ba72>] do_kern_mount+0x52/0x130 > [<ffffffff811aca1b>] do_mount+0x2fb/0x930 > [<ffffffff811ad0e0>] sys_mount+0x90/0xe0 > [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b > [<ffffffffffffffff>] 0xffffffffffffffff > > > > Thanks, > Austin > -- > To unsubscribe from this list: send the line "unsubscribe linux-cifs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Thanks, Steve -- To unsubscribe from this list: send the line "unsubscribe linux-cifs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
