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dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id V8IRGEmK72iWZgAAD6G6ig (envelope-from ); Wed, 15 Oct 2025 11:49:29 +0000 Date: Wed, 15 Oct 2025 13:49:29 +0200 Message-ID: <87sefkl706.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_drop In-Reply-To: <68dadf0e.050a0220.1696c6.001c.GAE@google.com> References: <68dadf0e.050a0220.1696c6.001c.GAE@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-Spam-Flag: NO X-Rspamd-Queue-Id: 9EAA31FB88 X-Rspamd-Action: no action X-Rspamd-Server: rspamd1.dmz-prg2.suse.org X-Spamd-Result: default: False [-1.01 / 50.00]; BAYES_HAM(-3.00)[100.00%]; SUSPICIOUS_RECIPS(1.50)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; URI_HIDDEN_PATH(1.00)[https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96]; MID_CONTAINS_FROM(1.00)[]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_FIVE(0.00)[6]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from,2a07:de40:b281:106:10:150:64:167:received]; TAGGED_RCPT(0.00)[c9ab1eb0f8f5ab1f18be]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_VIA_SMTP_AUTH(0.00)[]; REDIRECTOR_URL(0.00)[goo.gl]; SUBJECT_HAS_QUESTION(0.00)[] X-Spam-Score: -1.01 On Mon, 29 Sep 2025 21:33:34 +0200, syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 4ff71af020ae Merge tag 'net-6.17-rc8' of git://git.kernel... > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=1191c2e2580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=f5b21423ca3f0a96 > dashboard link: https://syzkaller.appspot.com/bug?extid=c9ab1eb0f8f5ab1f18be > compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1644dd34580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=156d6f12580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/3fb4198b5763/disk-4ff71af0.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/1499875eb2cc/vmlinux-4ff71af0.xz > kernel image: https://storage.googleapis.com/syzbot-assets/182864fb8af7/bzImage-4ff71af0.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c9ab1eb0f8f5ab1f18be@syzkaller.appspotmail.com > > ====================================================== > WARNING: possible circular locking dependency detected > syzkaller #0 Not tainted > ------------------------------------------------------ > syz.2.2869/8991 is trying to acquire lock: > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] > ffff8880b8823d90 ((softirq_ctrl.lock)){+.+.}-{3:3}, at: __local_bh_disable_ip+0x264/0x400 kernel/softirq.c:168 > > but task is already holding lock: > ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:93 [inline] > ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_group_lock_irq sound/core/pcm_native.c:98 [inline] > ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_stream_lock_irq sound/core/pcm_native.c:137 [inline] > ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: class_pcm_stream_lock_irq_constructor include/sound/pcm.h:679 [inline] > ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_drop+0x10d/0x270 sound/core/pcm_native.c:2223 > > which lock already depends on the new lock. > > > the existing dependency chain (in reverse order) is: > > -> #2 (&group->lock#2){+.+.}-{3:3}: > lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 > rt_spin_lock+0x88/0x2c0 kernel/locking/spinlock_rt.c:56 > spin_lock include/linux/spinlock_rt.h:44 [inline] > _snd_pcm_stream_lock_irqsave+0x7c/0xa0 sound/core/pcm_native.c:171 > class_pcm_stream_lock_irqsave_constructor include/sound/pcm.h:682 [inline] > snd_pcm_period_elapsed+0x1e/0x80 sound/core/pcm_lib.c:1938 > dummy_hrtimer_callback+0x80/0x180 sound/drivers/dummy.c:386 > __run_hrtimer kernel/time/hrtimer.c:1761 [inline] > __hrtimer_run_queues+0x54f/0xd40 kernel/time/hrtimer.c:1825 > hrtimer_run_softirq+0x1a3/0x2e0 kernel/time/hrtimer.c:1842 > handle_softirqs+0x22f/0x710 kernel/softirq.c:579 > __do_softirq kernel/softirq.c:613 [inline] > run_ktimerd+0xcf/0x190 kernel/softirq.c:1043 > smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > -> #1 (&base->softirq_expiry_lock){+...}-{3:3}: > lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 > rt_spin_lock+0x88/0x2c0 kernel/locking/spinlock_rt.c:56 > spin_lock include/linux/spinlock_rt.h:44 [inline] > hrtimer_cpu_base_lock_expiry kernel/time/hrtimer.c:1383 [inline] > hrtimer_run_softirq+0x7c/0x2e0 kernel/time/hrtimer.c:1838 > handle_softirqs+0x22f/0x710 kernel/softirq.c:579 > __do_softirq kernel/softirq.c:613 [inline] > run_ktimerd+0xcf/0x190 kernel/softirq.c:1043 > smpboot_thread_fn+0x53f/0xa60 kernel/smpboot.c:160 > kthread+0x70e/0x8a0 kernel/kthread.c:463 > ret_from_fork+0x436/0x7d0 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 > > -> #0 ((softirq_ctrl.lock)){+.+.}-{3:3}: > check_prev_add kernel/locking/lockdep.c:3165 [inline] > check_prevs_add kernel/locking/lockdep.c:3284 [inline] > validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 > __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 > reacquire_held_locks+0x127/0x1d0 kernel/locking/lockdep.c:5385 > __lock_release kernel/locking/lockdep.c:5574 [inline] > lock_release+0x1b4/0x3e0 kernel/locking/lockdep.c:5889 > __local_bh_enable_ip+0x10c/0x270 kernel/softirq.c:228 > hrtimer_cancel+0x39/0x60 kernel/time/hrtimer.c:1491 > dummy_hrtimer_stop+0xcf/0x100 sound/drivers/dummy.c:410 > snd_pcm_do_stop+0x127/0x1c0 sound/core/pcm_native.c:1525 > snd_pcm_action_single sound/core/pcm_native.c:1305 [inline] > snd_pcm_action+0xe4/0x240 sound/core/pcm_native.c:1388 > snd_pcm_stop sound/core/pcm_native.c:1561 [inline] > snd_pcm_drop+0x160/0x270 sound/core/pcm_native.c:2228 > snd_pcm_oss_sync+0x1de/0xc30 sound/core/oss/pcm_oss.c:1733 > snd_pcm_oss_release+0x102/0x250 sound/core/oss/pcm_oss.c:2574 > __fput+0x45b/0xa80 fs/file_table.c:468 > task_work_run+0x1d4/0x260 kernel/task_work.c:227 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 > exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] > syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] > do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > other info that might help us debug this: > > Chain exists of: > (softirq_ctrl.lock) --> &base->softirq_expiry_lock --> &group->lock#2 > > Possible unsafe locking scenario: > > CPU0 CPU1 > ---- ---- > lock(&group->lock#2); > lock(&base->softirq_expiry_lock); > lock(&group->lock#2); > lock((softirq_ctrl.lock)); > > *** DEADLOCK *** > > 2 locks held by syz.2.2869/8991: > #0: ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:93 [inline] > #0: ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_group_lock_irq sound/core/pcm_native.c:98 [inline] > #0: ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_stream_lock_irq sound/core/pcm_native.c:137 [inline] > #0: ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: class_pcm_stream_lock_irq_constructor include/sound/pcm.h:679 [inline] > #0: ffff8880302d0150 (&group->lock#2){+.+.}-{3:3}, at: snd_pcm_drop+0x10d/0x270 sound/core/pcm_native.c:2223 > #1: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] > #1: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] > #1: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline] > #1: ffffffff8d9a8d80 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1bb/0x2c0 kernel/locking/spinlock_rt.c:57 > > stack backtrace: > CPU: 0 UID: 0 PID: 8991 Comm: syz.2.2869 Not tainted syzkaller #0 PREEMPT_{RT,(full)} > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 > Call Trace: > > dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 > print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 > check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 > check_prev_add kernel/locking/lockdep.c:3165 [inline] > check_prevs_add kernel/locking/lockdep.c:3284 [inline] > validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 > __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 > reacquire_held_locks+0x127/0x1d0 kernel/locking/lockdep.c:5385 > __lock_release kernel/locking/lockdep.c:5574 [inline] > lock_release+0x1b4/0x3e0 kernel/locking/lockdep.c:5889 > __local_bh_enable_ip+0x10c/0x270 kernel/softirq.c:228 > hrtimer_cancel+0x39/0x60 kernel/time/hrtimer.c:1491 > dummy_hrtimer_stop+0xcf/0x100 sound/drivers/dummy.c:410 > snd_pcm_do_stop+0x127/0x1c0 sound/core/pcm_native.c:1525 > snd_pcm_action_single sound/core/pcm_native.c:1305 [inline] > snd_pcm_action+0xe4/0x240 sound/core/pcm_native.c:1388 > snd_pcm_stop sound/core/pcm_native.c:1561 [inline] > snd_pcm_drop+0x160/0x270 sound/core/pcm_native.c:2228 > snd_pcm_oss_sync+0x1de/0xc30 sound/core/oss/pcm_oss.c:1733 > snd_pcm_oss_release+0x102/0x250 sound/core/oss/pcm_oss.c:2574 > __fput+0x45b/0xa80 fs/file_table.c:468 > task_work_run+0x1d4/0x260 kernel/task_work.c:227 > resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] > exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 > exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] > syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] > syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] > do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7fc9f7ffeec9 > Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffef674cdc8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 > RAX: 0000000000000000 RBX: 0000000000036070 RCX: 00007fc9f7ffeec9 > RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 > RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000bf674d0bf > R10: 0000001b31c20000 R11: 0000000000000246 R12: 00007fc9f8255fac > R13: 00007fc9f8255fa0 R14: ffffffffffffffff R15: 0000000000000003 > > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup #syz fix: ALSA: pcm: Disable bottom softirqs as part of spin_lock_irq() on PREEMPT_RT