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[PATCH 0/1] block: Do not poll in bdrv_set_aio_context_ignore() when acq
From: |
Zhiyong Ye |
Subject: |
[PATCH 0/1] block: Do not poll in bdrv_set_aio_context_ignore() when acquiring new_context |
Date: |
Mon, 12 Jul 2021 13:38:30 +0800 |
When bdrv_set_aio_context_ignore() is called in the main loop to change
the AioContext onto the IO thread, the bdrv_drain_invoke_entry() never
gets to run and the IO thread hangs at co_schedule_bh_cb().
This is because the AioContext is occupied by the main thread after
being attached to the IO thread, and the main thread poll in
bdrv_drained_end() waiting for the IO request to be drained, but the IO
thread cannot acquire the AioContext, which leads to deadlock.
Zhiyong Ye (1):
block: Do not poll in bdrv_set_aio_context_ignore() when acquiring new_context
block.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--
2.11.0
- [PATCH 0/1] block: Do not poll in bdrv_set_aio_context_ignore() when acquiring new_context,
Zhiyong Ye <=