From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa2-f1.google.com (mail-oa2-f1.google.com [74.125.231.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8A8984DA537 for ; Thu, 27 Aug 2026 18:53:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787856829; cv=none; b=ZKqhU3vVFlXwZ/JuEToBP+AMVei35oVNbsBdo5/NnjQuR5Q1TexjZa7h0kWAR2GJF/nDdn6vbu54EnM07YXAwvB2/j9KQmK8vPdXu6VMFJfv9U4cV5wmL4zfq8ySacy2TEJLGkRGQqL+j6YEMbDhln3Z0OoGZWgYaxtNOvWuAkw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787856829; c=relaxed/simple; bh=3evSWErH5X9gbxTM+X5A5VAKoMQxNhR3lW84sXuwYgA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=q1joz42LAoUCRziQFk0Tb9H97oycbeFt57Sb9RwhQF27EeUX/LUFyok4VHiORYqS5J2Cl2GhoS1jvdoFD/Qbq9y+2lt89m35/eEQRySm8PKbtqZlf5ku+b71Ts2dz1IW43T/OchPPbb8kgOPeUE3AWnU2E81DHcPO43PMAJlAzQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oa2-f1.google.com with SMTP id 586e51a60fabf-4489b7aa0e7so2615fac.1 for ; Thu, 27 Aug 2026 11:53:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787856804; x=1788461604; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=7ClyFyv+LzA9R4j6L5nlr5tYhByGpJNxBtzqsdMJIEs=; b=gNq+5nc7OaUqISRbWuHfsIYw152SFrzzzL1fnfKPv+d1E3ywVmjJ5WqiTTlxUakmUw cL4mxEB17i17hYZlkDvXnaAQY9+aVUUQQKMMPNTOZ+VwSl9WfEgrNeZHQyJZC3FsEZVR 8hgwVpUgyzKcbbNu1Ukx+Gigbzd4qR4K1jNvL4f8C6EbFFUU73jc/h9M2R5VVllwXN+9 codQcXH6+HyzB7MfdIN0U1uHwgwaI5mf26tqT66At00LwyZIS0I2cYlvHCtVAWU/BLX5 Jawxlwv8C4kdL4mTYZXye46jjTTKtfvEH6/rgxiSUowFkyYEKuBxr7RqKkNWxAA8Phsq 1PVQ== X-Forwarded-Encrypted: i=1; AHgh+Rq2jZpyzT68FIfGRmwtxdtD+cjSjZ6Dk0PTdPv/2wJP0DHnJlZfwnj3rESs3+uDeDsduhWxpkYBQ1Ffoc0=@vger.kernel.org X-Gm-Message-State: AFuF++lulTpEMJKzfAHP37E22so4K5k2+VUfID10rRx2xn+/PdUiRcoY BRCIOkZJvVSxa/qctTdNZWjSXlGPt8X3zWjO1nn5PiRzL0SrSnw3CZ+RkHSex6UzyPa0YJ0V9Ss lPpSLC8ROR2J9idXjINMZNrwQLLlo/XF4us8E0Rf/3u05JuNJT3oHRTWL2xY= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1787:b0:6b1:3f1e:64a6 with SMTP id 006d021491bc7-6b1c6700c7bmr561031eaf.23.1787856803909; Thu, 27 Aug 2026 11:53:23 -0700 (PDT) Date: Thu, 27 Aug 2026 11:53:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a9087a3.4d659fcc.734b4.0012.GAE@google.com> Subject: [syzbot] [usb?] [input?] INFO: task hung in trigger_card_free From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 2709dd5ae32f Merge tag 'sched-urgent-2026-08-22' of git://.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=17f7a415580000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0978f5ed2905b98 dashboard link: https://syzkaller.appspot.com/bug?extid=a149ad38eaf1930d3e31 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15418979580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/1b8578cfc5d0/disk-2709dd5a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/08516f9ee501/vmlinux-2709dd5a.xz kernel image: https://storage.googleapis.com/syzbot-assets/94796f512f2e/bzImage-2709dd5a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+a149ad38eaf1930d3e31@syzkaller.appspotmail.com INFO: task syz.0.17:5991 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:25192 pid:5991 tgid:5991 ppid:5810 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5520 [inline] __schedule+0x1259/0x6920 kernel/sched/core.c:7270 __schedule_loop kernel/sched/core.c:7347 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7362 schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121 snd_card_free sound/core/init.c:665 [inline] trigger_card_free+0x127/0x190 sound/core/init.c:868 release_nodes+0xa5/0x120 drivers/base/devres.c:546 devres_release_all+0x112/0x180 drivers/base/devres.c:576 device_unbind_cleanup+0x81/0x270 drivers/base/dd.c:597 __device_release_driver drivers/base/dd.c:1354 [inline] device_release_driver_internal+0x4c4/0x620 drivers/base/dd.c:1372 unbind_store+0xf8/0x110 drivers/base/bus.c:244 drv_attr_store+0x74/0xb0 drivers/base/bus.c:125 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6af/0x1050 fs/read_write.c:687 ksys_write+0x12a/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f948ef9e0d9 RSP: 002b:00007ffeb02836d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f948f225fa0 RCX: 00007f948ef9e0d9 RDX: 000000000000000b RSI: 00002000000002c0 RDI: 0000000000000003 RBP: 00007f948f035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f948f225fac R14: 00007f948f225fa0 R15: 00007f948f225fa0 Showing all locks held in the system: locks held by kworker/u8:1/13: 4, last CPU#0: #0: ffff88801c08c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362 #1: ffffc90000127d08 ((work_completion)(&(&kfence_timer)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363 #2: ffffffff8ec7a830 (cpu_hotplug_lock){++++}-{0:0}, at: static_key_disable+0x12/0x20 kernel/jump_label.c:247 #3: ffffffff8ef3d400 (jump_label_mutex){+.+.}-{4:4}, at: jump_label_lock kernel/jump_label.c:27 [inline] #3: ffffffff8ef3d400 (jump_label_mutex){+.+.}-{4:4}, at: static_key_disable_cpuslocked+0x110/0x1c0 kernel/jump_label.c:238 locks held by khungtaskd/31: 1, last CPU#1: #0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffffffff8ede9d40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6793 locks held by getty/5355: 2, on CPU#1: #0: ffff88803848c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211 locks held by syz.0.17/5991: 3, on CPU#1: #0: ffff8880302a4460 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739 #1: ffff8880273d4080 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x2c2/0x5f0 fs/kernfs/file.c:336 #2: ffff8880338ca138 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline] #2: ffff8880338ca138 (&dev->mutex){....}-{4:4}, at: __device_driver_lock drivers/base/dd.c:1171 [inline] #2: ffff8880338ca138 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb2/0x620 drivers/base/dd.c:1369 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123 nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x141/0x190 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xcb1/0x1030 kernel/hung_task.c:561 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64 Code: 08 a1 02 e9 43 4f 03 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 e0 21 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 RSP: 0018:ffffffff8ea07cf0 EFLAGS: 00000246 RAX: 00000000002e8403 RBX: ffffffff8ea91500 RCX: ffffffff8bc9c115 RDX: 0000000000000001 RSI: ffffffff8e3dfa2f RDI: ffffffff8c619080 RBP: fffffbfff1d522a0 R08: 0000000000000001 R09: ffffed101708678d R10: ffff8880b8433c6b R11: 0000000000000001 R12: 0000000000000000 R13: 0000000000000000 R14: 1ffffffff1d40fa2 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888123b88000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe96a6cff8 CR3: 000000007cb49000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:62 [inline] default_idle+0x9/0x10 arch/x86/kernel/process.c:768 default_idle_call+0x6c/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x3ae/0x5b0 kernel/sched/idle.c:355 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:454 rest_init+0x2d3/0x2e0 init/main.c:723 start_kernel+0x48e/0x490 init/main.c:1181 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x158 --- 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