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Fri, 15 Mar 2024 10:14:31 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id 1r46GYcf9GVzaAAAD6G6ig (envelope-from ); Fri, 15 Mar 2024 10:14:31 +0000 Date: Fri, 15 Mar 2024 11:14:30 +0100 Message-ID: <87wmq3by49.wl-tiwai@suse.de> From: Takashi Iwai To: syzbot Cc: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org, perex@perex.cz, syzkaller-bugs@googlegroups.com, tiwai@suse.com Subject: Re: [syzbot] [sound?] possible deadlock in snd_pcm_period_elapsed (4) In-Reply-To: <0000000000000b9a510613b0145f@google.com> References: <0000000000000b9a510613b0145f@google.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-kernel@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-Level: X-Spamd-Bar: / Authentication-Results: smtp-out2.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b=aowXEWcR; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=hMhKqYEh X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [0.84 / 50.00]; ARC_NA(0.00)[]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; BAYES_HAM(-0.15)[68.98%]; TAGGED_RCPT(0.00)[28c1a5a5b041a754b947]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_LONG(-1.00)[-1.000]; RCPT_COUNT_FIVE(0.00)[6]; RCVD_COUNT_THREE(0.00)[3]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; DKIM_TRACE(0.00)[suse.de:+]; MX_GOOD(-0.01)[]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim]; FUZZY_BLOCKED(0.00)[rspamd.com]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; NEURAL_HAM_SHORT(-0.20)[-0.999]; RCVD_TLS_ALL(0.00)[]; SUSPICIOUS_RECIPS(1.50)[]; SUBJECT_HAS_QUESTION(0.00)[] X-Spam-Score: 0.84 X-Rspamd-Queue-Id: AFE0B1FB59 X-Spam-Flag: NO On Fri, 15 Mar 2024 11:00:31 +0100, syzbot wrote: (snip) > the shortest dependencies between 2nd lock and 1st lock: > -> (&timer->lock){+.+.}-{2:2} { > HARDIRQ-ON-W at: > lock_acquire+0x1e4/0x530 kernel/locking/lockdep.c:5754 > __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] > _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 > spin_lock include/linux/spinlock.h:351 [inline] > class_spinlock_constructor include/linux/spinlock.h:561 [inline] > snd_timer_close_locked+0x53/0x8d0 sound/core/timer.c:412 Ouch, I incorrectly converted from spin_lock_irq() to guard(spinlock). It should have been guard(spinlock_irq), of course. Will submit the fix patch. thanks, Takashi