[bug report] blktests nvme/tcp nvme/014 failed due to Read/Flush timeout

[Yi Zhang]

Hello

I found nvme/014 failed[1] on one of my servers, seems it was due to
Read/Flush timeout during the test[2], I tried to add sync operation
after the dd operation[3] and the failure can be fixed now and no
timeout from dmesg, could anyone help check if it's one test issue or
nvme/tcp stack issue, thanks.

[1]
# uname -r
6.9.0-rc4+
# nvme_trtype=tcp ./check nvme/014
nvme/014 (flush a NVMeOF block device-backed ns)             [failed]
    runtime  33.432s  ...  41.334s
    --- tests/nvme/014.out 2024-04-19 00:02:03.596691663 -0400
    +++ /root/blktests/results/nodev/nvme/014.out.bad 2024-04-22
00:10:10.042478026 -0400
    @@ -1,4 +1,4 @@
     Running nvme/014
    -NVMe Flush: success
    +NVMe status: Command Aborted By Host: The command was aborted as
a result of host action(0x371)
     disconnected 1 controller(s)
     Test complete
[2]
# dmesg
[  724.690961] run blktests nvme/014 at 2024-04-22 00:09:28
[  724.706957] loop0: detected capacity change from 0 to 2097152
[  724.715174] nvmet: adding nsid 1 to subsystem blktests-subsystem-1
[  724.724103] nvmet_tcp: enabling port 0 (127.0.0.1:4420)
[  724.735368] nvmet: creating nvm controller 1 for subsystem
blktests-subsystem-1 for NQN
nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349.
[  724.749633] nvme nvme1: creating 96 I/O queues.
[  724.757813] nvme nvme1: mapped 96/0/0 default/read/poll queues.
[  724.789035] nvme nvme1: new ctrl: NQN "blktests-subsystem-1", addr
127.0.0.1:4420, hostnqn:
nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349
[  758.518247] nvme nvme1: I/O tag 1 (0001) type 4 opcode 0x2 (I/O
Cmd) QID 86 timeout
[  758.525908] nvme nvme1: starting error recovery
[  758.530447] nvme nvme1: I/O tag 81 (0051) type 4 opcode 0x0 (I/O
Cmd) QID 87 timeout
[  758.538914] nvme1n1: I/O Cmd(0x2) @ LBA 2097024, 8 blocks, I/O
Error (sct 0x3 / sc 0x71)
[  758.547101] I/O error, dev nvme1n1, sector 2097024 op 0x0:(READ)
flags 0x80700 phys_seg 1 prio class 0
[  758.562940] nvme nvme1: Reconnecting in 10 seconds...
[  758.568093] nvme nvme1: Removing ctrl: NQN "blktests-subsystem-1"
[  758.572165] nvme1n1: I/O Cmd(0x0) @ LBA 2097024, 8 blocks, I/O
Error (sct 0x3 / sc 0x70)
[  758.582367] Buffer I/O error on dev nvme1n1, logical block 262128,
async page read
[  758.618831] nvme nvme1: Property Set error: 880, offset 0x14

[3]
diff --git a/tests/nvme/014 b/tests/nvme/014
index 839b91f..3f6a68f 100755
--- a/tests/nvme/014
+++ b/tests/nvme/014
@@ -37,7 +37,7 @@ test() {

        dd if=/dev/urandom of="/dev/${ns}" \
                count="${count}" bs="${bs}" status=none
-
+       sync
        nvme flush "/dev/${ns}"

        _nvme_disconnect_subsys

-- 
Best Regards,
  Yi Zhang