Hi all, I'm working to create an async model in fsal layer for my filesystem. As part of this, called "done_cb" for a read_req from my own thread in fsal layer. This causes hang and nfs4 stopped responding. Here is pseudo code for the read callback. i could see a similar implementation in FSAL_MEM (mem_handle.c) layer void fsal_read2_cb(void *cbArg, int err) { struct test_wa *wa = (struct test_wa*)cbArg; fsal_errors_t fsal_error = posix2fsal_error(err); struct root_op_context root_op_context; init_root_op_context(&root_op_context, wa->ctx_export, wa->fsal_export, 0, 0, UNKNOWN_REQUEST); wa->done_cb(wa->obj_hdl, fsalstat(fsal_error, err), wa->read_arg, wa->caller_arg); release_root_op_context(); free(wa); return; } Shouldn't we call done_cb from a custom thread ? Can you please let me know if i'm missing something and right way to do this - Thanks for the help Regards, Chakra