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Vishnu Razdan 49d565ede4 io_uring/io-wq: fix worker accounting when canceling creation callbacks 
commit 297b5ccea4 upstream.

create_worker_cb() reserves an io-wq worker slot only after its
task-work callback runs. If the callback is canceled before then,
io_worker_cancel_cb() still decrements acct->nr_workers. When an
existing worker retires with its creation callback pending, that
worker has already decremented the same account's worker count.

The resulting undercount permits worker creation beyond the account's
configured limit. On an AST2600 OpenBMC system, an unchanged sensor
daemon reached 4,291 threads with the original kernel. With an
equivalent downstream fix, 25 passive samples under its normal
workload showed 6-9 threads.

Decrement nr_workers only when the canceled callback is not
create_worker_cb(). Continuation callbacks still release their reserved
slot, and both callback types retain the existing running-count,
reference-count, and create-state cleanup.

[ Backport: retain the existing worker->wqe->lock protecting worker
  accounting. ]

Fixes: 1d5f5ea7cb ("io-wq: remove worker to owner tw dependency")
Cc: stable@vger.kernel.org
Assisted-by: Codex:gpt-5.6-sol
Reviewed-by: Gabriel Krisman Bertazi <krisman@suse.de>
Link: https://patch.msgid.link/20260811-vrazdan-io-wq-b4-submit-v1-1-719ced16c921@openai.com
Signed-off-by: Vishnu Razdan <vrazdan@openai.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-09-02 14:27:25 +02:00
arch KVM: x86: Retry page fault if MMU reload is pending and root has no sp 2026-08-27 14:28:22 +02:00
block partitions: aix: bound the pp_count scan to the ppe array 2026-07-24 15:51:24 +02:00
certs X.509: Fix validation of ASN.1 certificate header 2026-07-24 15:51:59 +02:00
crypto crypto: ccm - Set rfc4309 maxauthsize from child 2026-08-23 14:17:31 +02:00
Documentation PCI: Move Resizable BAR code to rebar.c 2026-07-24 15:51:58 +02:00
drivers RDMA/rxe: Fix OOB in free_rd_atomic_resources() 2026-09-02 14:27:25 +02:00
fs ext4: don't enable DAX on new encrypted files 2026-09-02 14:27:25 +02:00
include can: use skb hash instead of private variable in headroom 2026-08-27 14:28:22 +02:00
init bootconfig: move xbc_snprint_cmdline() to lib/bootconfig.c 2026-08-23 14:17:24 +02:00
io_uring io_uring/io-wq: fix worker accounting when canceling creation callbacks 2026-09-02 14:27:25 +02:00
ipc ipc/shm: serialize orphan cleanup with shm_nattch updates 2026-06-19 13:33:38 +02:00
kernel perf/core: Fix group leader use-after-free after sibling detach 2026-08-27 14:28:19 +02:00
lib bootconfig: fix NULL-pointer arithmetic in xbc_snprint_cmdline() 2026-08-23 14:17:24 +02:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm/huge_memory: fix huge_zero_pfn race 2026-08-27 14:28:19 +02:00
net inet: frags: strip GSO state from fragments before reassembly 2026-08-28 08:20:31 +02:00
samples tracing/events: Fix to check the simple_tsk_fn creation 2026-07-24 15:51:42 +02:00
scripts kconfig: fix potential NULL pointer dereference in conf_askvalue 2026-07-24 15:51:28 +02:00
security selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() 2026-08-23 14:17:21 +02:00
sound Revert "ALSA: aoa: Use guard() for mutex locks" 2026-08-27 14:28:23 +02:00
tools selftests/ftrace: refactor eprobes test to fix argument checks 2026-08-19 17:14:13 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-06-27 11:05:22 +01:00
virt KVM: Rename mmu_notifier_* to mmu_invalidate_* 2026-08-27 14:28:21 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Remove *.orig pattern from .gitignore 2024-10-17 15:11:10 +02:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS staging: rtl8712: Remove driver using deprecated API wext 2025-12-07 06:09:36 +09:00
Makefile Linux 5.15.219 2026-08-28 08:20:31 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.