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Li Lingfeng a70832d355 nfsd: decrease sc_count directly if fail to queue dl_recall [ Upstream commit `a1d14d931b` ] A deadlock warning occurred when invoking nfs4_put_stid following a failed dl_recall queue operation: T1 T2 nfs4_laundromat nfs4_get_client_reaplist nfs4_anylock_blockers __break_lease spin_lock // ctx->flc_lock spin_lock // clp->cl_lock nfs4_lockowner_has_blockers locks_owner_has_blockers spin_lock // flctx->flc_lock nfsd_break_deleg_cb nfsd_break_one_deleg nfs4_put_stid refcount_dec_and_lock spin_lock // clp->cl_lock When a file is opened, an nfs4_delegation is allocated with sc_count initialized to 1, and the file_lease holds a reference to the delegation. The file_lease is then associated with the file through kernel_setlease. The disassociation is performed in nfsd4_delegreturn via the following call chain: nfsd4_delegreturn --> destroy_delegation --> destroy_unhashed_deleg --> nfs4_unlock_deleg_lease --> kernel_setlease --> generic_delete_lease The corresponding sc_count reference will be released after this disassociation. Since nfsd_break_one_deleg executes while holding the flc_lock, the disassociation process becomes blocked when attempting to acquire flc_lock in generic_delete_lease. This means: 1) sc_count in nfsd_break_one_deleg will not be decremented to 0; 2) The nfs4_put_stid called by nfsd_break_one_deleg will not attempt to acquire cl_lock; 3) Consequently, no deadlock condition is created. Given that sc_count in nfsd_break_one_deleg remains non-zero, we can safely perform refcount_dec on sc_count directly. This approach effectively avoids triggering deadlock warnings. Fixes: `230ca75845` ("nfsd: put dl_stid if fail to queue dl_recall") Signed-off-by: Li Lingfeng <lilingfeng3@huawei.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> Signed-off-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		History 2025-05-02 07:44:12 +02:00
arch	riscv: KGDB: Remove ".option norvc/.option rvc" for kgdb_compiled_break	2025-05-02 07:44:11 +02:00
block	block: fix 'kmem_cache of name 'bio-108' already exists'	2025-04-10 14:31:51 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: testmgr - some more fixes to RSA test vectors	2025-03-13 12:50:48 +01:00
Documentation	scsi: libsas: Delete lldd_clear_aca callback	2025-05-02 07:44:07 +02:00
drivers	asus-laptop: Fix an uninitialized variable	2025-05-02 07:44:12 +02:00
fs	nfsd: decrease sc_count directly if fail to queue dl_recall	2025-05-02 07:44:12 +02:00
include	nfs: add missing selections of CONFIG_CRC32	2025-05-02 07:44:12 +02:00
init	initramfs: avoid filename buffer overrun	2024-12-14 19:50:42 +01:00
io_uring	io_uring: fix possible deadlock in io_register_iowq_max_workers()	2024-11-17 15:06:25 +01:00
ipc	ipc/sem: Fix dangling sem_array access in semtimedop race	2022-12-08 11:28:45 +01:00
kernel	cpufreq/sched: Fix the usage of CPUFREQ_NEED_UPDATE_LIMITS	2025-05-02 07:44:11 +02:00
lib	lib: scatterlist: fix sg_split_phys to preserve original scatterlist offsets	2025-05-02 07:44:03 +02:00
LICENSES	LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes"	2021-07-15 06:31:24 -06:00
mm	mm/hwpoison: do not send SIGBUS to processes with recovered clean pages	2025-05-02 07:44:04 +02:00
net	net: dsa: avoid refcount warnings when ds->ops->tag_8021q_vlan_del() fails	2025-05-02 07:44:11 +02:00
samples	samples/landlock: Fix possible NULL dereference in parse_path()	2025-03-13 12:49:57 +01:00
scripts	selinux: Chain up tool resolving errors in install_policy.sh	2025-04-10 14:31:57 +02:00
security	tomoyo: don't emit warning in tomoyo_write_control()	2025-03-13 12:50:18 +01:00
sound	ASoC: codecs:lpass-wsa-macro: Fix logic of enabling vi channels	2025-05-02 07:44:12 +02:00
tools	ktest: Fix Test Failures Due to Missing LOG_FILE Directories	2025-05-02 07:43:58 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:27:15 +01:00
virt	KVM: Fix a data race on last_boosted_vcpu in kvm_vcpu_on_spin()	2024-10-22 15:40:41 +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	trace: Relocate event helper files	2024-04-10 16:19:24 +02:00
Makefile	Linux 5.15.180	2025-04-10 14:32:07 +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.