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Thu, 21 Mar 2024 06:39:49 +0000 (UTC) Received: from dovecot-director2.suse.de ([10.150.64.162]) by imap1.dmz-prg2.suse.org with ESMTPSA id BE0cGzXW+2UdUQAAD6G6ig (envelope-from ); Thu, 21 Mar 2024 06:39:49 +0000 Date: Thu, 21 Mar 2024 07:39:49 +0100 Message-ID: <87v85grsui.wl-tiwai@suse.de> From: Takashi Iwai To: "Alex Xu (Hello71)" Cc: linux-kernel@vger.kernel.org, linux-sound@vger.kernel.org Subject: Re: Regression: SUnreclaim leak: snd_ctl_ioctl? In-Reply-To: <1710953751.8yx03664pf.none@localhost> References: <1710953751.8yx03664pf.none.ref@localhost> <1710953751.8yx03664pf.none@localhost> 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: Authentication-Results: smtp-out1.suse.de; dkim=pass header.d=suse.de header.s=susede2_rsa header.b="gCbqFw/l"; dkim=pass header.d=suse.de header.s=susede2_ed25519 header.b=LcBbmugh X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Result: default: False [-3.01 / 50.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[suse.de:+]; MX_GOOD(-0.01)[]; NEURAL_HAM_SHORT(-0.20)[-1.000]; FREEMAIL_TO(0.00)[yahoo.ca]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; SUBJECT_ENDS_QUESTION(1.00)[]; BAYES_HAM(-1.50)[91.66%]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; FREEMAIL_ENVRCPT(0.00)[yahoo.ca]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[text/plain]; NEURAL_HAM_LONG(-1.00)[-1.000]; DWL_DNSWL_MED(-2.00)[suse.de:dkim]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MID_CONTAINS_FROM(1.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim]; FUZZY_BLOCKED(0.00)[rspamd.com]; RCVD_TLS_ALL(0.00)[] X-Spam-Score: -3.01 X-Rspamd-Queue-Id: 961C433705 X-Spam-Flag: NO On Wed, 20 Mar 2024 18:01:22 +0100, Alex Xu (Hello71) wrote: > > Hi all, > > In the last few days of running torvalds master kernel, I found that > SUnreclaim memory seems to increase indefinitely. slabinfo -r kmalloc-2k > says: > > Slabcache: kmalloc-2k Aliases: 0 Order : 3 Objects: 1272941 > > Sizes (bytes) Slabs Debug Memory > ------------------------------------------------------------------------ > Object : 2048 Total : 264991 Sanity Checks : On Total: 8683225088 > SlabObj: 6144 Full : 264972 Redzoning : On Used : 2606983168 > SlabSiz: 32768 Partial: 19 Poisoning : On Loss : 6076241920 > Loss : 4096 CpuSlab: 0 Tracking : On Lalig: 5213966336 > Align : 2048 Objects: 5 Tracing : Off Lpadd: 542701568 > > kmalloc-2k has no kmem_cache operations > > kmalloc-2k: Kernel object allocation > ----------------------------------------------------------------------- > 1272283 snd_ctl_ioctl+0x45f/0x6d0 waste=1048361192/824 age=6141/183854/366927 pid=687-33984 cpus=0-1,3-8,10 > memdup_user+0x21/0x70 > snd_ctl_ioctl+0x45f/0x6d0 > __x64_sys_ioctl+0x85/0xa0 > do_syscall_64+0x3d/0xf0 > entry_SYSCALL_64_after_hwframe+0x46/0x4e > > 189 acpi_add_single_object+0x38/0x710 waste=119448/632 age=368130/368134/368138 pid=1 cpus=0 > [ ... ] > > kmalloc-2k: Kernel object freeing > ------------------------------------------------------------------------ > 633587 age=4295305473 pid=0 cpus=0 > 382872 rcu_core+0x284/0x540 age=4513/194630/361523 pid=0-21201 cpus=0-11 > rcu_core+0x284/0x540 > __do_softirq+0xad/0x1de > > 247690 amdgpu_dm_atomic_commit_tail+0x1721/0x3740 age=6157/199198/366963 pid=163-19507 cpus=0-11 > amdgpu_dm_atomic_commit_tail+0x1721/0x3740 > commit_tail+0x8a/0x120 > process_one_work+0x12b/0x250 > worker_thread+0x2d9/0x3f0 > kthread+0xac/0xe0 > ret_from_fork+0x28/0x40 > ret_from_fork_asm+0x11/0x20 > > 2794 __sk_destruct+0x17a/0x1b0 age=994/147194/368001 pid=0-19414 cpus=0-11 > [ ... ] > > So, if I understand correctly, some memory copied from userspace for > snd_ctl_ioctl is not freed correctly. The PIDs were pipewire, > wireplumber, and pipewire-pulse, so I restarted those but it didn't > resolve the issue. > > Let me know what other information is needed. Likely the same issue fixed by https://lore.kernel.org/r/20240320062722.31325-1-tiwai@suse.de It'll be included in the next PR for 6.9-rc1. thanks, Takashi