Hi Xiaoguang,
Was doing some other testing today, and noticed a hang with fixed files.
I did a bit of poor mans bisecting, and came up with this one:
commit 0558955373023b08f638c9ede36741b0e4200f58
Author: Xiaoguang Wang <xiaoguang.wang@xxxxxxxxxxxxxxxxx>
Date: Tue Mar 31 14:05:18 2020 +0800
io_uring: refactor file register/unregister/update handling
If I revert this one, the test completes fine.
The case case is pretty simple, just run t/io_uring from the fio
repo, default settings:
[ fio] # t/io_uring /dev/nvme0n1p2
Added file /dev/nvme0n1p2
sq_ring ptr = 0x0x7fe1cb81f000
sqes ptr = 0x0x7fe1cb81d000
cq_ring ptr = 0x0x7fe1cb81b000
polled=1, fixedbufs=1, buffered=0 QD=128, sq_ring=128, cq_ring=256
submitter=345
IOPS=240096, IOS/call=32/31, inflight=91 (91)
IOPS=249696, IOS/call=32/31, inflight=99 (99)
^CExiting on signal 2
and ctrl-c it after a second or so. You'll then notice a kworker that
is stuck in io_sqe_files_unregister(), here:
/* wait for all refs nodes to complete */
wait_for_completion(&data->done);
I'll try and debug this a bit, and for some reason it doens't trigger
with the liburing fixed file setup. Just wanted to throw this out there,
so if you have cycles, please do take a look at it.
--
Jens Axboe
