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Thu, 15 Oct 2026 07:17:53 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 9IovECF+0Gr+NQAAD6G6ig (envelope-from ); Thu, 15 Oct 2026 07:17:53 +0000 Date: Thu, 15 Oct 2026 09:17:52 +0200 Message-ID: <87qzhrmnz3.wl-tiwai@suse.de> From: Takashi Iwai To: Cen Zhang Cc: Takashi Iwai , perex@perex.cz, tiwai@suse.com, phucduc.bui@gmail.com, cezary.rojewski@intel.com, cassiogabrielcontato@gmail.com, kees+treewide@kernel.org, yilinzhang@moonshot.ai, sammiee5311@gmail.com, kees@kernel.org, thomas.weissschuh@linutronix.de, tglx@kernel.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, baijiaju1990@gmail.com, jjzuming@gmail.com Subject: Re: [PATCH v2] ALSA: pcm: Unlink substreams before releasing them In-Reply-To: References: <87zewgcuhy.wl-tiwai@suse.de> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spam-Flag: NO X-Spam-Score: -1.80 X-Spam-Level: X-Spamd-Result: default: False [-1.80 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; TAGGED_RCPT(0.00)[treewide]; FREEMAIL_TO(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; FREEMAIL_CC(0.00)[suse.de,perex.cz,suse.com,gmail.com,intel.com,kernel.org,moonshot.ai,linutronix.de,vger.kernel.org]; RCPT_COUNT_TWELVE(0.00)[17]; FROM_EQ_ENVFROM(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_MATCH_ENVRCPT_SOME(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; TO_DN_SOME(0.00)[] On Thu, 15 Oct 2026 04:07:10 +0200, Cen Zhang wrote: > > Hi Takashi, > > > > > Applied to for-next branch now. > > > > A problem with racy link removal Sashiko suggested is an interesting > > case to be revisited, but it's no regression and can be triggered > > independently from this change. > > > > > > Takashi > > I saw that. The drain/unlink case looks like a real concurrency issue. > I'll try to > address it with a separate patch. The patch I submitted yesterday is such an attempt: https://lore.kernel.org/20261014141212.316223-1-tiwai@suse.de Unfortunately it couldn't be reviewed by Sashiko, as it's based on my latest tree. And now I noticed that there is still a potential race, and fixed now. Will resubmit v2 patch. thanks, Takashi