From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.3 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B31C7C433DF for ; Thu, 18 Jun 2020 12:14:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 87F1E207E8 for ; Thu, 18 Jun 2020 12:14:21 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="lcbKheFd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729424AbgFRMOO (ORCPT ); Thu, 18 Jun 2020 08:14:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34104 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728504AbgFRMN6 (ORCPT ); Thu, 18 Jun 2020 08:13:58 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2EE99C06174E for ; Thu, 18 Jun 2020 05:13:57 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id i4so2590661pjd.0 for ; Thu, 18 Jun 2020 05:13:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=x0lgrdcopjaVOctmG20zbnI2jrhQsvZ4Lfg8Y2MC+Fk=; b=lcbKheFdrG7gdM/PYs4TnHXFl+nO8cgkm5dutjgszqKyEVUMgIOddhJtaNmFe26XuT LA8XdcuZ3cC3FxTbyMrfAJ8W/se76kiPZOys0NbmiJmHV2kKDDb4d9AL0M0mxgb6orqZ +vDWIS2A60W6leyq2XBZSkQLHO026kbvVL745yPJ2SJiaD8txdWIpsYoNuy1TJ+EiOos htXuZgZPI9Yen99q2XdBEvNE/lcJU9OP+12Z2TY1soFpCmOcKB/K0JlbKt84QTg9Q++l IOMcRB7R7/xjWvllIhVw4tIef4TD0XdBkLsdLFFxTOlT06Z6Owe+t41zi5g2yozQxLfB 3dnA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=x0lgrdcopjaVOctmG20zbnI2jrhQsvZ4Lfg8Y2MC+Fk=; b=hsRlz+neQ5FBhLdMQZS+O24tcudrehG+MTf05KeffnPnQGXSvSRRiIg6xVzJD1Amx/ q7zfczAmWDP2eISRJ5nHW4V8TTX2KYNFztrK6uBSn2mTEUbpUE1igcI+0DtWilNQocsE 869fEfilR78S5ymIlEA4c3aFtWZyqbIKBUvUVwd6kr5vV0kQiDR0VFemqtK4SWo9AK4S 9R9Toyn38m6A1cZkDZQJ1/uASneWOBgKJxmRgkWIvHzon2zsEDfkDhDkyLVpTuuxHnfQ HpGuWht3DjEw41uKtUMKXdn/xo3XEwXLzwEz/eQHN0UjLYBtw+7l9SFHsJJT9AMsn+Ro VT0w== X-Gm-Message-State: AOAM5315VGsKypM2QtRyLkB1CxBZeseLO/qs9Ff+6usCkQyzVb10/eQV ZH57fjv7ccoUsEKQFjUtPo4qlsMNKBa7KYmeeacKIA== X-Google-Smtp-Source: ABdhPJzD/7OWnsEikEVKDWmHggA5gH/99eYyE6dvm0IdeUcQsiq9TWKRuNim6GrDsqPF8kVYTdg/paTB16BZ8XCVGs8= X-Received: by 2002:a17:90b:1244:: with SMTP id gx4mr3921767pjb.136.1592482436360; Thu, 18 Jun 2020 05:13:56 -0700 (PDT) MIME-Version: 1.0 References: <000000000000cdaa560596acbc4e@google.com> In-Reply-To: <000000000000cdaa560596acbc4e@google.com> From: Andrey Konovalov Date: Thu, 18 Jun 2020 14:13:45 +0200 Message-ID: Subject: Re: INFO: task hung in chaoskey_disconnect To: syzbot Cc: alexandre.belloni@bootlin.com, Arnd Bergmann , b.zolnierkie@samsung.com, Greg Kroah-Hartman , Herbert Xu , linux-crypto@vger.kernel.org, LKML , USB list , lvivier@redhat.com, mchehab+samsung@kernel.org, mpm@selenic.com, swboyd@chromium.org, syzkaller-bugs Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Nov 6, 2019 at 1:32 PM syzbot wrote: > > Hello, > > syzbot found the following crash on: > > HEAD commit: b1aa9d83 usb: raw: add raw-gadget interface > git tree: https://github.com/google/kasan.git usb-fuzzer > console output: https://syzkaller.appspot.com/x/log.txt?x=16ae2adce00000 > kernel config: https://syzkaller.appspot.com/x/.config?x=79de80330003b5f7 > dashboard link: https://syzkaller.appspot.com/bug?extid=f41c4f7c6d8b0b778780 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10248158e00000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16afbf7ce00000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+f41c4f7c6d8b0b778780@syzkaller.appspotmail.com > > INFO: task kworker/0:2:101 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/0:2 D25552 101 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:2:102 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:2 D25608 102 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:0:1732 blocked for more than 143 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:0 D26016 1732 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:3:1733 blocked for more than 144 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:3 D26016 1733 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > INFO: task kworker/1:4:1735 blocked for more than 144 seconds. > Not tainted 5.4.0-rc6+ #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > kworker/1:4 D25760 1735 2 0x80004000 > Workqueue: usb_hub_wq hub_event > Call Trace: > schedule+0xca/0x250 kernel/sched/core.c:4136 > schedule_timeout+0x682/0xb20 kernel/time/timer.c:1871 > do_wait_for_common kernel/sched/completion.c:83 [inline] > __wait_for_common kernel/sched/completion.c:104 [inline] > wait_for_common kernel/sched/completion.c:115 [inline] > wait_for_completion+0x26f/0x3c0 kernel/sched/completion.c:136 > kthread_stop+0x10c/0x610 kernel/kthread.c:559 > hwrng_unregister+0x190/0x210 drivers/char/hw_random/core.c:538 > chaoskey_disconnect+0x1b2/0x200 drivers/usb/misc/chaoskey.c:232 > usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:423 > __device_release_driver drivers/base/dd.c:1134 [inline] > device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1165 > bus_remove_device+0x2dc/0x4a0 drivers/base/bus.c:532 > device_del+0x420/0xb20 drivers/base/core.c:2376 > usb_disable_device+0x211/0x690 drivers/usb/core/message.c:1237 > usb_disconnect+0x284/0x8d0 drivers/usb/core/hub.c:2200 > hub_port_connect drivers/usb/core/hub.c:5035 [inline] > hub_port_connect_change drivers/usb/core/hub.c:5324 [inline] > port_event drivers/usb/core/hub.c:5470 [inline] > hub_event+0x16f2/0x3800 drivers/usb/core/hub.c:5552 > process_one_work+0x92b/0x1530 kernel/workqueue.c:2269 > process_scheduled_works kernel/workqueue.c:2331 [inline] > worker_thread+0x7ab/0xe20 kernel/workqueue.c:2417 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > > Showing all locks held in the system: > 5 locks held by kworker/1:1/22: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d932fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d515c200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d515c200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cb4fd200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cb4fd200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cb4fe190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 1 lock held by khungtaskd/23: > #0: ffffffff86cfe8a0 (rcu_read_lock){....}, at: > debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:5335 > 5 locks held by kworker/0:2/101: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d536fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50a1200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50a1200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cffb7200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cffb7200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf220190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:2/102: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d53d7dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50d0200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50d0200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cea1b200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cea1b200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cea1c190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 1 lock held by rsyslogd/1599: > #0: ffff8881d3aaad60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 > fs/file.c:801 > 2 locks held by getty/1690: > #0: ffff8881d1458090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004492e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1691: > #0: ffff8881d1569090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004692e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1692: > #0: ffff8881d1430090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000044d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1693: > #0: ffff8881d1436090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004552e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1694: > #0: ffff8881d145e090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000045d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1695: > #0: ffff8881d156a090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc9000046d2e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 2 locks held by getty/1696: > #0: ffff8881d2225090 (&tty->ldisc_sem){++++}, at: > tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 > #1: ffffc900004352e0 (&ldata->atomic_read_lock){+.+.}, at: > n_tty_read+0x223/0x1ae0 drivers/tty/n_tty.c:2156 > 5 locks held by kworker/1:0/1732: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881cfa67dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d512d200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d512d200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cf153200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cf153200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf156190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:3/1733: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881d024fdd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d50d7200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d50d7200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881c5fe9200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881c5fe9200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881c5feb190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > 5 locks held by kworker/1:4/1735: > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > __write_once_size include/linux/compiler.h:226 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: atomic64_set > include/asm-generic/atomic-instrumented.h:855 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > atomic_long_set include/asm-generic/atomic-long.h:40 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: set_work_data > kernel/workqueue.c:620 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > set_work_pool_and_clear_pending kernel/workqueue.c:647 [inline] > #0: ffff8881d8c82d28 ((wq_completion)usb_hub_wq){+.+.}, at: > process_one_work+0x827/0x1530 kernel/workqueue.c:2240 > #1: ffff8881cfaa7dd0 ((work_completion)(&hub->events)){+.+.}, at: > process_one_work+0x85b/0x1530 kernel/workqueue.c:2244 > #2: ffff8881d510e200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #2: ffff8881d510e200 (&dev->mutex){....}, at: hub_event+0x1b2/0x3800 > drivers/usb/core/hub.c:5498 > #3: ffff8881cf982200 (&dev->mutex){....}, at: device_lock > include/linux/device.h:1462 [inline] > #3: ffff8881cf982200 (&dev->mutex){....}, at: usb_disconnect+0x91/0x8d0 > drivers/usb/core/hub.c:2191 > #4: ffff8881cf400190 (&dev->mutex){....}, at: > device_release_driver_internal+0x23/0x500 drivers/base/dd.c:1162 > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 PID: 23 Comm: khungtaskd Not tainted 5.4.0-rc6+ #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0xca/0x13e lib/dump_stack.c:113 > nmi_cpu_backtrace.cold+0x55/0x96 lib/nmi_backtrace.c:101 > nmi_trigger_cpumask_backtrace+0x1b0/0x1c7 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] > watchdog+0x9a4/0xe50 kernel/hung_task.c:289 > kthread+0x318/0x420 kernel/kthread.c:255 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 skipped: idling at native_safe_halt > arch/x86/include/asm/irqflags.h:60 [inline] > NMI backtrace for cpu 1 skipped: idling at arch_safe_halt > arch/x86/include/asm/irqflags.h:103 [inline] > NMI backtrace for cpu 1 skipped: idling at default_idle+0x28/0x2e0 > arch/x86/kernel/process.c:580 > > > --- > This bug 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 bug report. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches Closing old USB bugs that haven't happened for a long time. #syz invalid