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SubjectRe: [REGRESSION] lxc-stop hang on 5.17.x kernels
From
On 5/2/22 19:49, Daniel Harding wrote:
> On 5/2/22 20:40, Pavel Begunkov wrote:
>> On 5/2/22 18:00, Jens Axboe wrote:
>>> On 5/2/22 7:59 AM, Jens Axboe wrote:
>>>> On 5/2/22 7:36 AM, Daniel Harding wrote:
>>>>> On 5/2/22 16:26, Jens Axboe wrote:
>>>>>> On 5/2/22 7:17 AM, Daniel Harding wrote:
>>>>>>> I use lxc-4.0.12 on Gentoo, built with io-uring support
>>>>>>> (--enable-liburing), targeting liburing-2.1.  My kernel config is a
>>>>>>> very lightly modified version of Fedora's generic kernel config. After
>>>>>>> moving from the 5.16.x series to the 5.17.x kernel series, I started
>>>>>>> noticed frequent hangs in lxc-stop.  It doesn't happen 100% of the
>>>>>>> time, but definitely more than 50% of the time. Bisecting narrowed
>>>>>>> down the issue to commit aa43477b040251f451db0d844073ac00a8ab66ee:
>>>>>>> io_uring: poll rework. Testing indicates the problem is still present
>>>>>>> in 5.18-rc5. Unfortunately I do not have the expertise with the
>>>>>>> codebases of either lxc or io-uring to try to debug the problem
>>>>>>> further on my own, but I can easily apply patches to any of the
>>>>>>> involved components (lxc, liburing, kernel) and rebuild for testing or
>>>>>>> validation.  I am also happy to provide any further information that
>>>>>>> would be helpful with reproducing or debugging the problem.
>>>>>> Do you have a recipe to reproduce the hang? That would make it
>>>>>> significantly easier to figure out.
>>>>>
>>>>> I can reproduce it with just the following:
>>>>>
>>>>>      sudo lxc-create --n lxc-test --template download --bdev dir --dir /var/lib/lxc/lxc-test/rootfs -- -d ubuntu -r bionic -a amd64
>>>>>      sudo lxc-start -n lxc-test
>>>>>      sudo lxc-stop -n lxc-test
>>>>>
>>>>> The lxc-stop command never exits and the container continues running.
>>>>> If that isn't sufficient to reproduce, please let me know.
>>>>
>>>> Thanks, that's useful! I'm at a conference this week and hence have
>>>> limited amount of time to debug, hopefully Pavel has time to take a look
>>>> at this.
>>>
>>> Didn't manage to reproduce. Can you try, on both the good and bad
>>> kernel, to do:
>>
>> Same here, it doesn't reproduce for me
> OK, sorry it wasn't something simple.
>> # echo 1 > /sys/kernel/debug/tracing/events/io_uring/enable
>>>
>>> run lxc-stop
>>>
>>> # cp /sys/kernel/debug/tracing/trace ~/iou-trace
>>>
>>> so we can see what's going on? Looking at the source, lxc is just using
>>> plain POLL_ADD, so I'm guessing it's not getting a notification when it
>>> expects to, or it's POLL_REMOVE not doing its job. If we have a trace
>>> from both a working and broken kernel, that might shed some light on it.
> It's late in my timezone, but I'll try to work on getting those traces tomorrow.

I think I got it, I've attached a trace.

What's interesting is that it issues a multi shot poll but I don't
see any kind of cancellation, neither cancel requests nor task/ring
exit. Perhaps have to go look at lxc to see how it's supposed
to work

--
Pavel Begunkov# tracer: nop
#
# entries-in-buffer/entries-written: 207/207 #P:16
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
lxc-start-3026 [010] ..... 58.519361: io_uring_create: ring 00000000de7fa538, fd 3 sq size 512, cq size 1024, flags 0x0
lxc-start-3026 [010] ..... 58.519418: io_uring_create: ring 0000000001d3ba30, fd 4 sq size 512, cq size 1024, flags 0x0
lxc-start-3026 [010] ..... 58.519433: io_uring_submit_sqe: ring 00000000de7fa538, req 0000000061bba231, user_data 0x5631784e5920, opcode 6, flags 0x80000, non block 1, sq_thread 0
lxc-start-3026 [010] ..... 58.519434: io_uring_file_get: ring 00000000de7fa538, req 0000000061bba231, user_data 0x5631784e5920, fd 7
lxc-start-3026 [010] ..... 58.519438: io_uring_submit_sqe: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, flags 0x80000, non block 1, sq_thread 0
lxc-start-3026 [010] ..... 58.519438: io_uring_file_get: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, fd 31
lxc-start-3026 [010] ..... 58.519442: io_uring_submit_sqe: ring 00000000de7fa538, req 000000004b8dead2, user_data 0x5631784e59c0, opcode 6, flags 0x80000, non block 1, sq_thread 0
lxc-start-3026 [010] ..... 58.519442: io_uring_file_get: ring 00000000de7fa538, req 000000004b8dead2, user_data 0x5631784e59c0, fd 5
lxc-start-3026 [010] ..... 58.519444: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:4-164 [005] d..1. 58.542112: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.542147: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.542165: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:4-164 [005] d..1. 58.542245: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.542272: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.542278: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:4-164 [005] d..1. 58.542419: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [002] ...1. 58.542433: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [002] ..... 58.542449: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.705795: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [004] ...1. 58.705838: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [004] ..... 58.705859: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.705947: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [004] ...1. 58.705981: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [004] ..... 58.705990: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.706420: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.706460: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.706472: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.706516: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.706552: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.706561: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.706878: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.706910: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.706920: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.706932: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.706940: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.706942: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.707011: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.707044: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.707054: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.707527: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.707560: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.707569: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.708337: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.708360: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.708366: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.708443: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.708466: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.708472: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.708515: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.708538: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.708544: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.708597: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.708620: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.708626: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.708637: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [006] ...1. 58.708643: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [006] ..... 58.708645: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.709330: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.709371: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.709387: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:4-164 [005] d..1. 58.711588: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.711605: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.711618: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.713658: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.713677: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.713697: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.716828: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.716849: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.716872: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [014] d..1. 58.717675: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.717693: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.717703: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.726493: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.726510: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.726526: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.727418: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.727436: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.727453: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [014] d..1. 58.730047: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.730076: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.730094: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [003] d..1. 58.730287: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.730309: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.730313: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [003] d..1. 58.730948: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [010] ...1. 58.730964: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [010] ..... 58.730978: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [007] d..1. 58.734533: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.734563: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.734578: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [007] d..1. 58.737818: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.737838: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.737850: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [014] d..1. 58.739063: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.739102: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.739116: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.739723: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.739750: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.739758: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.750710: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [008] ...1. 58.750744: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [008] ..... 58.750756: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.751685: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.751705: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.751717: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.751740: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.751749: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.751752: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.757615: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.757631: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.757646: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.757727: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.757735: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.757742: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.757998: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758009: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758015: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.758181: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758206: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758212: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.758275: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758299: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758305: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.758336: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758343: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758345: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [014] d..1. 58.758348: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758352: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758353: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.758365: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758372: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758373: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [012] d..1. 58.758937: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.758955: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.758961: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.769910: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.769952: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.769962: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.770059: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.770094: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.770103: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.770736: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.770757: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.770767: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.770876: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.770892: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.770896: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [002] d..1. 58.771562: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.771579: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.771586: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [004] d..1. 58.772074: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.772092: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.772098: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.772902: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.772924: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.772943: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.774121: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.774142: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.774157: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.774821: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.774835: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.774844: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.775258: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.775270: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.775276: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.775613: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.775622: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.775625: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.775706: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.775716: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.775717: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.776105: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.776114: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.776116: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:2-120 [005] d..1. 58.776501: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.776515: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.776518: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [002] d..1. 58.778234: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.778256: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.778278: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.779513: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.779540: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.779557: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.851129: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.851159: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.851182: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.851306: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.851318: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.851323: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.851347: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.851357: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.851361: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.852176: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.852212: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.852221: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [004] d..1. 58.859578: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 58.859605: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 58.859630: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [014] d..1. 59.861798: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 59.861827: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-start-3026 [015] ..... 59.861855: io_uring_cqring_wait: ring 00000000de7fa538, min_events 1
kworker/u32:3-139 [014] d..1. 59.863176: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 59.863191: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
kworker/u32:2-120 [005] d..1. 59.863195: io_uring_task_add: ring 00000000de7fa538, req 000000000dd2a118, user_data 0x5631784e5970, opcode 6, mask 41
lxc-start-3026 [015] ...1. 59.863206: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e5970, result 1, cflags 0x2
lxc-stop-3305 [005] d..1. 76.843006: io_uring_task_add: ring 00000000de7fa538, req 000000004b8dead2, user_data 0x5631784e59c0, opcode 6, mask c3
lxc-start-3026 [015] ...1. 76.843057: io_uring_complete: ring 00000000de7fa538, req 0000000000000000, user_data 0x5631784e59c0, result 1, cflags 0x2
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