From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f199.google.com (mail-il1-f199.google.com [209.85.166.199]) (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 0B12D1946DA for ; Sun, 20 Oct 2024 16:38:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729442313; cv=none; b=ARzOxpSEbVxeMca69aEQfNwH2IpqWCBVTZsxJUCeONtgiuiIFXHaiC+ChE8mA4T4nCc5OyYEqNL4R2AaxdSa2n80hu/w7GMbabv2FNEGE8rsRob1Z2Ommk4i4e4IEkBI7MqC+65emhF0L5r4Ogh3hT7w3EblDQtSYNRzZm3cDiA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729442313; c=relaxed/simple; bh=RNbZMFjGuWRf9PWXyyH3g7ytzX5MviRa0QhwRcU8Z+w=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=qt96KC4fH7VkMmstHBdpYy0S6F4rCt4kC+iD6Wm8DbVOdZ5KF5uIoEsWKrZtZI+j2EoZRuuoqreq0JwRr/X4Ov8cBx8tFc4sb4ugjA33dTZB5e18YUIxxzeaRAgLNfwtfZSurxH7wJg5pv6H1J8hL9885XLGXzfSrXJAginLgGg= 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=209.85.166.199 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-il1-f199.google.com with SMTP id e9e14a558f8ab-3a3c70e58bfso29304405ab.3 for ; Sun, 20 Oct 2024 09:38:30 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1729442310; x=1730047110; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=EdjxvHJnuzTO5zwvPQilrVGk1BqZfV5w3kusSwVm8f0=; b=mu2gVuNJHm46tnlun8HXCPGZuEIc9CjSpHoC6zgvWg6QAjLGhac4qQ9lH2BAkWL0aE hhiZqdjlQJwGXdakXpb2hPC1qWsr0LhTmhIFKlBN7OT7AswypgUgj6XUqM235r+nYFjR LKTzJJRmtW7+fydrRDnzY/K+pF3f3mM4iAJE8UchmS2OFe3NU5rHDOvSige3b15RGcad UlqUNxTHH0mHRMar36bdZu3ZCtxyJE0kAwEglcAxW9KMkHHFYxSU9kZipLMNoBq7TnFV c3s30ICxr4BBCYkysGIzBQPcuTDNZNcVVDNrYHFiYICSR53Pc9vYHQ+JWhQWAcueE+n9 SO6A== X-Forwarded-Encrypted: i=1; AJvYcCXpncoc0PWpq6izJLcFwU+cBrbb2XaQCU0UlgmUSftqTgwOJrfZCa+Txi496G+9l9SpYX0fTvXqqDZMYEs=@vger.kernel.org X-Gm-Message-State: AOJu0YxOL5kXr0Vl+s0qRK2F0oZ5n42M10AWcShz35hGznb27D4c2AEA Ah7aIh+xXimz4HyLhx5Ffr0TQzlqOY7CUvPFuSgAH7zZsBzvR6qTeSPTJeFY7m9cNe3N491whAG dGZ8jhOOkB0OK+naxyR8DG6ndyS3V7GTH8penM1PMkux1p0Cpa1iYvtE= X-Google-Smtp-Source: AGHT+IE6ARPUYKlje25EoGyFwTm/5XjbKtWMja2OiAyJax3I8AK5V8CReARP0M1QNPGHBPHlVNyXMuCj0Xh1LlKIe5snv33HRfq7 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a92:c546:0:b0:3a0:378a:884b with SMTP id e9e14a558f8ab-3a3f40474c5mr60967495ab.3.1729442310010; Sun, 20 Oct 2024 09:38:30 -0700 (PDT) Date: Sun, 20 Oct 2024 09:38:29 -0700 In-Reply-To: <6709234e.050a0220.3e960.0011.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67153205.050a0220.1e4b4d.0048.GAE@google.com> Subject: Re: [syzbot] [usb?] INFO: task hung in usb_port_suspend From: syzbot To: gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, stern@rowland.harvard.edu, sylv@sylv.io, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 07b887f8236e xhci: add helper to stop endpoint and wait fo.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=11e9425f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=9878fe11046ea2c6 dashboard link: https://syzkaller.appspot.com/bug?extid=f342ea16c9d06d80b585 compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13a36c87980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17a36c87980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c447438ae517/disk-07b887f8.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/1430abb44ca1/vmlinux-07b887f8.xz kernel image: https://storage.googleapis.com/syzbot-assets/53e62be3705b/bzImage-07b887f8.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f342ea16c9d06d80b585@syzkaller.appspotmail.com INFO: task kworker/0:0:8 blocked for more than 143 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:0 state:D stack:24544 pid:8 tgid:8 ppid:2 flags:0x00004000 Workqueue: pm pm_runtime_work Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 usb_kill_urb.part.0+0x1ca/0x250 drivers/usb/core/urb.c:713 usb_kill_urb+0x83/0xa0 drivers/usb/core/urb.c:702 usb_start_wait_urb+0x255/0x4c0 drivers/usb/core/message.c:65 usb_internal_control_msg drivers/usb/core/message.c:103 [inline] usb_control_msg+0x327/0x4b0 drivers/usb/core/message.c:154 usb_enable_remote_wakeup drivers/usb/core/hub.c:3365 [inline] usb_port_suspend+0x339/0xf10 drivers/usb/core/hub.c:3472 usb_generic_driver_suspend+0xeb/0x1d0 drivers/usb/core/generic.c:302 usb_suspend_device drivers/usb/core/driver.c:1272 [inline] usb_suspend_both+0x66d/0x9c0 drivers/usb/core/driver.c:1443 usb_runtime_suspend+0x49/0x180 drivers/usb/core/driver.c:1968 __rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:394 rpm_callback+0x192/0x1d0 drivers/base/power/runtime.c:448 rpm_suspend+0x2e7/0x1200 drivers/base/power/runtime.c:672 __pm_runtime_suspend+0xbc/0x160 drivers/base/power/runtime.c:1142 pm_runtime_autosuspend include/linux/pm_runtime.h:342 [inline] usb_runtime_idle+0x4c/0x60 drivers/usb/core/driver.c:2005 rpm_idle+0x2f7/0x740 drivers/base/power/runtime.c:524 pm_runtime_work+0x120/0x150 drivers/base/power/runtime.c:970 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INFO: task syz-executor264:2749 blocked for more than 143 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor264 state:D stack:27120 pid:2749 tgid:2749 ppid:2655 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 rpm_resume+0x5a8/0x1330 drivers/base/power/runtime.c:834 rpm_resume+0x750/0x1330 drivers/base/power/runtime.c:892 __pm_runtime_resume+0xb6/0x170 drivers/base/power/runtime.c:1172 pm_runtime_resume_and_get include/linux/pm_runtime.h:430 [inline] usb_autopm_get_interface+0x20/0xe0 drivers/usb/core/driver.c:1833 wdm_open+0x24a/0x630 drivers/usb/class/cdc-wdm.c:730 usb_open+0x186/0x220 drivers/usb/core/file.c:47 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:958 vfs_open+0x82/0x3f0 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3933 do_filp_open+0x1dc/0x430 fs/namei.c:3960 do_sys_openat2+0x17a/0x1e0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5497b6aa11 RSP: 002b:00007fff3baf7250 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5497b6aa11 RDX: 0000000000000002 RSI: 00007fff3baf72e0 RDI: 00000000ffffff9c RBP: 00007fff3baf72e0 R08: 000000000000000f R09: 00007fff3baf7067 R10: 0000000000000000 R11: 0000000000000202 R12: 000000000002ff58 R13: 00007fff3baf770c R14: 00007fff3baf7720 R15: 00007fff3baf7710 INFO: task syz-executor264:2750 blocked for more than 144 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor264 state:D stack:28384 pid:2750 tgid:2750 ppid:2656 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 usb_open+0x186/0x220 drivers/usb/core/file.c:47 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:958 vfs_open+0x82/0x3f0 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3933 do_filp_open+0x1dc/0x430 fs/namei.c:3960 do_sys_openat2+0x17a/0x1e0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5497b6aa11 RSP: 002b:00007fff3baf7250 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5497b6aa11 RDX: 0000000000000002 RSI: 00007fff3baf72e0 RDI: 00000000ffffff9c RBP: 00007fff3baf72e0 R08: 000000000000000f R09: 00007fff3baf7067 R10: 0000000000000000 R11: 0000000000000202 R12: 000000000002ff82 R13: 00007fff3baf770c R14: 00007fff3baf7720 R15: 00007fff3baf7710 INFO: task syz-executor264:2751 blocked for more than 144 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor264 state:D stack:28224 pid:2751 tgid:2751 ppid:2654 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_release+0x4b/0x440 drivers/usb/class/cdc-wdm.c:764 __fput+0x3f6/0xb60 fs/file_table.c:431 task_work_run+0x14e/0x250 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xadd/0x2ce0 kernel/exit.c:939 do_group_exit+0xd3/0x2a0 kernel/exit.c:1088 __do_sys_exit_group kernel/exit.c:1099 [inline] __se_sys_exit_group kernel/exit.c:1097 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1097 x64_sys_call+0x14a9/0x16a0 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5497b69ab9 RSP: 002b:00007fff3baf7698 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5497b69ab9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007f5497be4370 R08: ffffffffffffffb8 R09: ffffffffffffffff R10: 00007f5497be43c0 R11: 0000000000000246 R12: 00007f5497be4370 R13: 0000000000000000 R14: 00007f5497be8080 R15: 00007f5497b37c80 INFO: task syz-executor264:2753 blocked for more than 144 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor264 state:D stack:26016 pid:2753 tgid:2753 ppid:2652 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 usb_open+0x186/0x220 drivers/usb/core/file.c:47 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:958 vfs_open+0x82/0x3f0 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3933 do_filp_open+0x1dc/0x430 fs/namei.c:3960 do_sys_openat2+0x17a/0x1e0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5497b6aa11 RSP: 002b:00007fff3baf7250 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5497b6aa11 RDX: 0000000000000002 RSI: 00007fff3baf72e0 RDI: 00000000ffffff9c RBP: 00007fff3baf72e0 R08: 000000000000000f R09: 00007fff3baf7067 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000030341 R13: 00007fff3baf770c R14: 00007fff3baf7720 R15: 00007fff3baf7710 INFO: task syz-executor264:2754 blocked for more than 144 seconds. Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor264 state:D stack:27936 pid:2754 tgid:2754 ppid:2657 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:5322 [inline] __schedule+0x105f/0x34b0 kernel/sched/core.c:6682 __schedule_loop kernel/sched/core.c:6759 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6774 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831 __mutex_lock_common kernel/locking/mutex.c:684 [inline] __mutex_lock+0x5b8/0x9c0 kernel/locking/mutex.c:752 wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 usb_open+0x186/0x220 drivers/usb/core/file.c:47 chrdev_open+0x237/0x6a0 fs/char_dev.c:414 do_dentry_open+0x6cb/0x1390 fs/open.c:958 vfs_open+0x82/0x3f0 fs/open.c:1088 do_open fs/namei.c:3774 [inline] path_openat+0x1e6a/0x2d60 fs/namei.c:3933 do_filp_open+0x1dc/0x430 fs/namei.c:3960 do_sys_openat2+0x17a/0x1e0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1441 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5497b6aa11 RSP: 002b:00007fff3baf7250 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f5497b6aa11 RDX: 0000000000000002 RSI: 00007fff3baf72e0 RDI: 00000000ffffff9c RBP: 00007fff3baf72e0 R08: 000000000000000f R09: 00007fff3baf7067 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000030406 R13: 00007fff3baf770c R14: 00007fff3baf7720 R15: 00007fff3baf7710 Showing all locks held in the system: 3 locks held by kworker/0:0/8: #0: ffff888100eed548 ((wq_completion)pm){+.+.}-{0:0}, at: process_one_work+0x129b/0x1ba0 kernel/workqueue.c:3204 #1: ffffc9000008fd80 ((work_completion)(&dev->power.work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff8881077f7508 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline] #2: ffff8881077f7508 (&port_dev->status_lock){+.+.}-{3:3}, at: usb_port_suspend+0x255/0xf10 drivers/usb/core/hub.c:3463 1 lock held by khungtaskd/30: #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff88ebb100 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6720 2 locks held by getty/2609: #0: ffff88810f7650a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000432f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz-executor264/2749: #0: ffffffff899dae90 (minor_rwsem){++++}-{3:3}, at: usb_open+0x23/0x220 drivers/usb/core/file.c:38 #1: ffffffff89a96908 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz-executor264/2750: #0: ffffffff899dae90 (minor_rwsem){++++}-{3:3}, at: usb_open+0x23/0x220 drivers/usb/core/file.c:38 #1: ffffffff89a96908 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 1 lock held by syz-executor264/2751: #0: ffffffff89a96908 (wdm_mutex){+.+.}-{3:3}, at: wdm_release+0x4b/0x440 drivers/usb/class/cdc-wdm.c:764 2 locks held by syz-executor264/2753: #0: ffffffff899dae90 (minor_rwsem){++++}-{3:3}, at: usb_open+0x23/0x220 drivers/usb/core/file.c:38 #1: ffffffff89a96908 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 2 locks held by syz-executor264/2754: #0: ffffffff899dae90 (minor_rwsem){++++}-{3:3}, at: usb_open+0x23/0x220 drivers/usb/core/file.c:38 #1: ffffffff89a96908 (wdm_mutex){+.+.}-{3:3}, at: wdm_open+0x5d/0x630 drivers/usb/class/cdc-wdm.c:715 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00051-g07b887f8236e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xf0c/0x1240 kernel/hung_task.c:379 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111 --- 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.