Hello, I'm mounting an NFS4 volume from a kernel 2.6.32-27 server in a 2.6.37-020637rc2 client. Very often, when there is significant IO on the mounted volume, the client hangs. The process accessing the mountpoint is stuck in D state. Any more attempts to access the mountpoint get stuck in D state as well. Shortly after, the kernel reports the task as hanging: [ 3120.620125] Call Trace: [ 3120.620138] [<c05ec44d>] ? _raw_spin_lock+0xd/0x10 [ 3120.620146] [<c05eb4b6>] __mutex_lock_slowpath+0xc6/0x120 [ 3120.620152] [<c05eb1c5>] mutex_lock+0x25/0x40 [ 3120.620158] [<c022e3b3>] do_lookup+0xc3/0x120 [ 3120.620164] [<c022fbb2>] link_path_walk+0x402/0x9b0 [ 3120.620171] [<c0167b5a>] ? queue_work+0x1a/0x20 Additional tasks hang at a slightly different point: [ 3120.620304] [<f90b863d>] ? nfs_access_add_cache+0xcd/0x120 [nfs] [ 3120.620326] [<f90b8709>] ? nfs_do_access+0x79/0xc0 [nfs] [ 3120.620333] [<c05eb4b6>] __mutex_lock_slowpath+0xc6/0x120 [ 3120.620339] [<c05eb1c5>] mutex_lock+0x25/0x40 [ 3120.620344] [<c022e3b3>] do_lookup+0xc3/0x120 [ 3120.620350] [<c022fbb2>] link_path_walk+0x402/0x9b0 [ 3120.620356] [<c0230697>] path_walk+0x47/0xa0 [ 3120.620361] [<c0230819>] do_path_lookup+0x59/0xb0 [ 3120.620367] [<c02311ff>] user_path_at+0x3f/0x70 [ 3120.620374] [<c02005b8>] ? do_linear_fault+0x58/0x70 [ 3120.620380] [<c020133a>] ? handle_mm_fault+0xda/0x230 [ 3120.620387] [<c0228899>] vfs_fstatat+0x49/0x70 Finally, the client saturates the 100 MBit connection with sending and receiving from the NFS server. I'm pretty sure this is garbage data, even if the client would copy the entire mountpoint there wouldn't be that much data to copy. There are no visible symptoms on the server. Anyone able to help? Thanks, -Nikolaus -- ÂTime flies like an arrow, fruit flies like a Banana. PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6 02CF A9AD B7F8 AE4E 425C -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
