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ublk: reject FETCH from non-userspace context#787

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ublk: reject FETCH from non-userspace context#787
blktests-ci[bot] wants to merge 1 commit into
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@blktests-ci blktests-ci Bot commented May 1, 2026

Pull request for series with
subject: ublk: reject FETCH from non-userspace context
version: 1
url: https://patchwork.kernel.org/project/linux-block/list/?series=1088461

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blktests-ci Bot commented May 1, 2026

Upstream branch: e75a43c
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from 5a9f7c7 to 25a041f Compare May 3, 2026 02:07
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blktests-ci Bot commented May 3, 2026

Upstream branch: 66edb90
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 58dfbc2 to 8e0d980 Compare May 3, 2026 02:16
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from 25a041f to 6f75bd1 Compare May 4, 2026 10:57
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blktests-ci Bot commented May 4, 2026

Upstream branch: 6d35786
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 8e0d980 to 3603bc2 Compare May 4, 2026 11:07
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from 6f75bd1 to 1f0d33a Compare May 5, 2026 15:39
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blktests-ci Bot commented May 5, 2026

Upstream branch: 6d35786
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 3603bc2 to f30394b Compare May 5, 2026 15:51
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from 1f0d33a to b1870f6 Compare May 10, 2026 15:59
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blktests-ci Bot commented May 10, 2026

Upstream branch: aa54b1d
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from f30394b to d6804d3 Compare May 10, 2026 16:23
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from b1870f6 to ca57796 Compare May 15, 2026 07:55
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blktests-ci Bot commented May 15, 2026

Upstream branch: 70eda68
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from d6804d3 to baebeb6 Compare May 15, 2026 08:31
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from ca57796 to c1feb59 Compare May 21, 2026 02:54
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blktests-ci Bot commented May 21, 2026

Upstream branch: 8bc67e4
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from baebeb6 to 564b887 Compare May 21, 2026 03:34
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from c1feb59 to ea833a1 Compare May 22, 2026 01:53
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blktests-ci Bot commented May 22, 2026

Upstream branch: 6779b50
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 564b887 to 154173e Compare May 22, 2026 02:31
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from ea833a1 to 7af85d1 Compare May 23, 2026 06:11
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blktests-ci Bot commented May 23, 2026

Upstream branch: 79bd2dd
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 154173e to 462c070 Compare May 23, 2026 07:27
@blktests-ci blktests-ci Bot force-pushed the linus-master_base branch from 7af85d1 to de94ac7 Compare May 23, 2026 17:08
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blktests-ci Bot commented May 23, 2026

Upstream branch: eed108e
series: https://patchwork.kernel.org/project/linux-block/list/?series=1088461
version: 1

@ming1
ublk: reject FETCH from non-userspace context
87af82f 
__ublk_fetch() sets io->task to current, which is later checked
against io_uring_cmd_get_task() in ublk_uring_cmd_cancel_fn().
With REQ_F_FORCE_ASYNC, the FETCH uring_cmd can be issued from
task work, which can be run from io_uring's fallback workqueue,
causing a task mismatch and triggering the WARN in cancel_fn.

Reject FETCH if current is not a real userspace task, and it is
reasonable for failing it in case of io_uring fallback.

Fixes: 3421c7f ("ublk: make sure io cmd handled in submitter task context")
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
@blktests-ci blktests-ci Bot force-pushed the series/1088461=>linus-master branch from 462c070 to 87af82f Compare May 23, 2026 17:57
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