On 08/28/2010 09:48 AM, Vijai Baskar wrote: > The server and the client are different.. Server is the board and > client is my PC. > > > On Mon, Aug 23, 2010 at 4:47 PM, Jeff Layton <jlayton@xxxxxxxxxx> wrote: >> On Mon, 23 Aug 2010 10:40:34 +0530 >> Vijai Baskar <cristalmaze@xxxxxxxxx> wrote: >> >>> Hi all, >>> >>> I am running a samba copy of a 4GB file from my local hard disk to a >>> remote hard disk and then find md5sum of the same file in the remote >>> hard disk through samba read. I do the following to accomplish this: >>> >>> 1. mount -t cifs //ip-addr/data /mnt >>> 2. cp /home/4g /mnt >>> 3. md5sum /mnt/4g >>> >>> After a few iterations of the above operation I get the following >>> warning on the board: >>> >>> echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. >>> [ 6122.450000] smbd � � � � �D c0204908 � � 0 �9712 � �372 0x00000000 >>> [ 6122.480000] [<c0204908>] (schedule+0x2dc/0x328) from [<c0204980>] >>> (io_schedule+0x2c/0x48) >>> [ 6122.500000] [<c0204980>] (io_schedule+0x2c/0x48) from [<c0072064>] >>> (sync_page+0x44/0x50) >>> [ 6122.530000] [<c0072064>] (sync_page+0x44/0x50) from [<c0204dd4>] >>> (__wait_on_bit_lock+0x5c/0xa8) >>> [ 6122.560000] [<c0204dd4>] (__wait_on_bit_lock+0x5c/0xa8) from >>> [<c0071ff0>] (__lock_page+0x88/0xa0) >>> [ 6122.590000] [<c0071ff0>] (__lock_page+0x88/0xa0) from [<c007b530>] >>> (truncate_inode_pages_range+0x2e4/0x38c) >>> [ 6122.620000] [<c007b530>] (truncate_inode_pages_range+0x2e4/0x38c) >>> from [<c007b5f0>] (truncate_inode_pages+0x18/0x20) >>> [ 6122.640000] [<c007b5f0>] (truncate_inode_pages+0x18/0x20) from >>> [<c0085acc>] (vmtruncate+0xe4/0x14c) >>> [ 6122.670000] [<c0085acc>] (vmtruncate+0xe4/0x14c) from [<c00a43a8>] >>> (inode_setattr+0x48/0x148) >>> [ 6122.700000] [<c00a43a8>] (inode_setattr+0x48/0x148) from >>> [<c00a4630>] (notify_change+0x188/0x1dc) >>> [ 6122.730000] [<c00a4630>] (notify_change+0x188/0x1dc) from >>> [<c0091440>] (do_truncate+0x6c/0x88) >>> [ 6122.760000] [<c0091440>] (do_truncate+0x6c/0x88) from [<c00915c0>] >>> (do_sys_ftruncate+0x164/0x170) >>> [ 6122.800000] [<c00915c0>] (do_sys_ftruncate+0x164/0x170) from >>> [<c00915e0>] (sys_ftruncate64+0x14/0x1c) >>> [ 6122.830000] [<c00915e0>] (sys_ftruncate64+0x14/0x1c) from >>> [<c0027fa0>] (ret_fast_syscall+0x0/0x2c) >>> >>> After this samba daemon hangs in the D state. I changed the values of >>> /proc/sys/vm/dirty_writeback_centisecs to 250 (default 500) and >>> /proc/sys/vm/dirty_expire_centisecs to 1000 (default 3000). But this >>> only delays the problem. ps-ax shows smbd in D state. This problem >>> seems to occur only during samba read. >>> >>> Can someone please provide me a solution for the above problem? >>> >>> regards, >>> vijai >>> >> >> (cc'ing linux-fsdevel and samba-technical as this problem is probably >> better reported there) >> >> The stack trace above is for smbd, so I doubt this has much to do with >> cifs per-se. Just to make sure though -- are the server and client the >> same host? Hint: if so, that configuration is prone to deadlock under >> heavy I/O. >> >> When reporting kernel bugs, it's also a good idea to mention the kernel >> version. It might also be helpful to know what the underlying >> filesystem is that's being served out. Care to provide the kernel version and filesystem info requested above? >> >> It looks like the process is hung trying to lock a page. Most likely >> that means that something else is holding that lock and not releasing >> it for some reason. Debugging this will probably mean figuring out >> what's holding that lock and why it's not releasing it. >> Do you have a reliable way of reproducing the problem? Thanks, -- Suresh Jayaraman -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
