Re: io_uring failure on parisc with VIPT caches

John David Anglin
2023-02-15T21:39:27Z

On 2023-02-15 4:06 p.m., John David Anglin wrote:
> On 2023-02-15 3:37 p.m., Jens Axboe wrote:
>>> System crashes running test buf-ring.t.
>> Huh, what's the crash?
> Not much info.  System log indicates an HPMC occurred. Unfortunately, recovery code doesn't work.
The following occurred running buf-ring.t under gdb:

INFO: task kworker/u64:9:18319 blocked for more than 123 seconds.
Not tainted 6.1.12+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u64:9   state:D stack:0     pid:18319 ppid:2 flags:0x00000000
Workqueue: events_unbound io_ring_exit_work
Backtrace:
[<0000000040b5c210>] __schedule+0x2e8/0x7f0
[<0000000040b5c7d0>] schedule+0xb8/0x1d0
[<0000000040b66534>] schedule_timeout+0x11c/0x1b0
[<0000000040b5d71c>] __wait_for_common+0x194/0x2e8
[<0000000040b5d8ac>] wait_for_completion+0x3c/0x50
[<0000000040b46508>] io_ring_exit_work+0x3d8/0x4d0
[<0000000040268da8>] process_one_work+0x238/0x520
[<00000000402692a4>] worker_thread+0x214/0x778
[<0000000040276f94>] kthread+0x24c/0x258
[<0000000040202020>] ret_from_kernel_thread+0x20/0x28

INFO: task kworker/u64:10:18320 blocked for more than 123 seconds.
Not tainted 6.1.12+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u64:10  state:D stack:0     pid:18320 ppid:2 flags:0x00000000
Workqueue: events_unbound io_ring_exit_work
Backtrace:
[<0000000040b5c210>] __schedule+0x2e8/0x7f0
[<0000000040b5c7d0>] schedule+0xb8/0x1d0
[<0000000040b66534>] schedule_timeout+0x11c/0x1b0
[<0000000040b5d71c>] __wait_for_common+0x194/0x2e8
[<0000000040b5d8ac>] wait_for_completion+0x3c/0x50
[<0000000040b46508>] io_ring_exit_work+0x3d8/0x4d0
[<0000000040268da8>] process_one_work+0x238/0x520
[<00000000402692a4>] worker_thread+0x214/0x778
[<0000000040276f94>] kthread+0x24c/0x258
[<0000000040202020>] ret_from_kernel_thread+0x20/0x28

gdb was sitting at a break at line 328.

--
John David Anglin dave.anglin@bell.net