----- Original Message ----- > From: "Trond Myklebust" <trond.myklebust@xxxxxxxxxxxxxxx> > > I attempted to get a backtrace from one of the uninterruptable apache > > processes: > > echo w > /proc/sysrq-trigger > > > > Here's one example: > > [1227348.003904] apache2 D 0000000000000000 0 10175 1773 > > 0x00000004 > > [1227348.003906] ffff8802813178c8 0000000000000082 0000000000015e00 > > 0000000000015e00 > > [1227348.003908] ffff8801d88f03d0 ffff880281317fd8 0000000000015e00 > > ffff8801d88f0000 > > [1227348.003910] 0000000000015e00 ffff880281317fd8 0000000000015e00 > > ffff8801d88f03d0 > > [1227348.003912] Call Trace: > > [1227348.003918] [<ffffffffa00a5ca0>] ? rpc_wait_bit_killable+0x0/0x40 > > [sunrpc] > > [1227348.003923] [<ffffffffa00a5cc4>] rpc_wait_bit_killable+0x24/0x40 > > [sunrpc] > > [1227348.003925] [<ffffffff8156a41f>] __wait_on_bit+0x5f/0x90 > > [1227348.003930] [<ffffffffa00a5ca0>] ? rpc_wait_bit_killable+0x0/0x40 > > [sunrpc] > > [1227348.003932] [<ffffffff8156a4c8>] out_of_line_wait_on_bit+0x78/0x90 > > [1227348.003934] [<ffffffff81086790>] ? wake_bit_function+0x0/0x40 > > [1227348.003939] [<ffffffffa00a6611>] __rpc_execute+0x191/0x2a0 [sunrpc] > > [1227348.003945] [<ffffffffa00a6746>] rpc_execute+0x26/0x30 [sunrpc] > > That basically means that the process is hanging in the RPC layer, somewhere > in the state machine. ‘echo 0 >/proc/sys/sunrpc/rpc_debug’ as the ‘root’ > user should give us a dump of which state these RPC calls are in. Can you > please try that? Yes I will definitely run that the next time it happens, but since it occurs sporadically (and I have not yet found a way to reproduce it on demand), it could be days before it occurs again. I'll also run "netstat -tn" to check the TCP connections the next time this happens. -- 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
