From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f77.google.com (mail-ot1-f77.google.com [209.85.210.77]) (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 597AB3F9F25 for ; Fri, 14 Aug 2026 10:37:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786703856; cv=none; b=CDKBeDDyOqGp8Yq7OkNaZFbsD3fgdsff3hBGvobkGLiTzkzy+RLT5/KMUit9zdEVRcJ9jcH503KeWQTHo1FAfFZ2+WWEmCeVot9xvkn3XwtxhMCHmVmEPS/ImM2RX3OsohEPvY9OtrUNOCOsET70pTRaTCCg5gzeXZdP1ZbHoRk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786703856; c=relaxed/simple; bh=iLm6yHdgH9uTz6XEjQZ4K0e0vkLBndFd2jp/Lxiobpo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=LnTaCFeBwJXR5Y7GwU1b12roU/HyD1myO8AVTPscDTZfzD0PikbfflsqOIj9x6N8trH66bZSEbXf1geIk8HlPfRqJCRlQCz1+/6uPEDtzVlTS2NwjiVNAEuoOyCMyQhE5D2klFn6d6jCHY390fU0AuH/63U7aAm2iku6eQ9A2Gk= 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=209.85.210.77 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-ot1-f77.google.com with SMTP id 46e09a7af769-7ec6685adabso1205523a34.0 for ; Fri, 14 Aug 2026 03:37:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1786703846; x=1787308646; 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=V8h9rcswZfmF0SHe0JimNyQe+xhlf/jwvw/S/NcoY/Q=; b=R/Yzz7OizEJpCb+et82wBaXM+/03jV1+CI1jk/C52FWAmki3MGBCQiyYdbOzGgMSxd d02bDVmhmaDgJvjjuTBw3rBUvMizZ8rR25LeYMT60PkaqcqdErpliTo2+IOD+h7//1CI UHimx1jz9AnVuWZNgCVWntTbYJh2FOjtkAlgOOuRjTfXz94KT9x1aOJgTwZQVgftuZRZ prj8t6rDcD+7x1ce95ubIjNji8PxlGtg9WXQPiSX16F3F8FEm9UPIX9hjrYc2F5sF637 rcyEt2qSS6nRiH7DYs49Va+DHHs1jF9lre1mHBB2fGmkFLfcskjGtA0iWqPDvoZmXgOS JdZg== X-Forwarded-Encrypted: i=1; AHgh+Rr5BAVpnz3HRnPVy6F2nrhWQe/r6TdgvGX1yP5PK2/Q/J/UbE5wbXB39QMs/StVq844X2CS1Q8K+rBNErk=@vger.kernel.org X-Gm-Message-State: AOJu0Yw376aSVFv9gS1VPXUD8FmlX1EATDlzSQwSzPw/NkXbvw/FCA4C OpD8Sx8TiDWTmUm/amZOPqw3gG0iU5pCfmc+EZaTMaOI/sj9SsEOUjpxYOn4lQj3Wqg/oZFvy6v NhH1NHoz5ydAbctW4tPjZeYB3fmofw8VcBIrcp14pfg1kK6Qzn19YSNCkaGw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4b82:b0:6a1:8b23:d4c8 with SMTP id 006d021491bc7-6b0d5fa52bemr4170435eaf.3.1786703846321; Fri, 14 Aug 2026 03:37:26 -0700 (PDT) Date: Fri, 14 Aug 2026 03:37:26 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7eefe6.f7a79266.2f965f.0001.GAE@google.com> Subject: [syzbot] [kernel?] INFO: task hung in usb_disable_device (2) From: syzbot To: dakr@kernel.org, driver-core@lists.linux.dev, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, mcgrof@kernel.org, rafael@kernel.org, russ.weight@linux.dev, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 5d5fd841c346 Merge 7.2-rc5 into usb-next 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=14fbca9e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=6ec4d592e55f7960 dashboard link: https://syzkaller.appspot.com/bug?extid=5cf28d3643d94bfb0821 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2ed536ae4daf/disk-5d5fd841.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ab40098ccbf1/vmlinux-5d5fd841.xz kernel image: https://storage.googleapis.com/syzbot-assets/66d5c395f47c/bzImage-5d5fd841.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+5cf28d3643d94bfb0821@syzkaller.appspotmail.com INFO: task kworker/1:1:28 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/1:1 state:D stack:19176 pid:28 tgid:28 ppid:2 task_flags:0x4208060 flags:0x00080000 Workqueue: usb_hub_wq hub_event Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1325/0x47d0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7326 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0xccc/0x1bd0 kernel/locking/mutex.c:821 device_lock include/linux/device.h:1102 [inline] device_del+0xa0/0x9b0 drivers/base/core.c:3923 usb_disable_device+0x367/0x810 drivers/usb/core/message.c:1478 usb_disconnect+0x2e2/0x9a0 drivers/usb/core/hub.c:2350 hub_port_connect drivers/usb/core/hub.c:5412 [inline] hub_port_connect_change drivers/usb/core/hub.c:5712 [inline] port_event drivers/usb/core/hub.c:5876 [inline] hub_event+0x1d0c/0x4af0 drivers/usb/core/hub.c:5958 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 INFO: task kworker/0:2:247 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/0:2 state:D stack:20520 pid:247 tgid:247 ppid:2 task_flags:0x4288060 flags:0x00080000 Workqueue: events request_firmware_work_func Call Trace: context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1325/0x47d0 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0xdd/0x2c0 kernel/sched/core.c:7326 lbs_wait_for_firmware_load+0x11e/0x1e0 drivers/net/wireless/marvell/libertas/firmware.c:117 lbs_remove_card+0x84/0x390 drivers/net/wireless/marvell/libertas/main.c:913 if_usb_disconnect+0xc5/0x270 drivers/net/wireless/marvell/libertas/if_usb.c:317 usb_unbind_interface+0x1dd/0x9e0 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:618 [inline] device_remove+0x12a/0x180 drivers/base/dd.c:610 __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x44e/0x620 drivers/base/dd.c:1372 usb_driver_release_interface drivers/usb/core/driver.c:643 [inline] usb_forced_unbind_intf+0x1a4/0x240 drivers/usb/core/driver.c:1137 usb_reset_device+0x411/0xaa0 drivers/usb/core/hub.c:6409 if_usb_reset_device.isra.0+0x21e/0x290 drivers/net/wireless/marvell/libertas/if_usb.c:400 if_usb_prog_firmware+0x626/0xef0 drivers/net/wireless/marvell/libertas/if_usb.c:889 lbs_fw_loaded drivers/net/wireless/marvell/libertas/firmware.c:23 [inline] helper_firmware_cb drivers/net/wireless/marvell/libertas/firmware.c:80 [inline] helper_firmware_cb+0x1f7/0x2d0 drivers/net/wireless/marvell/libertas/firmware.c:64 request_firmware_work_func+0x13f/0x440 drivers/base/firmware_loader/main.c:1164 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Showing all locks held in the system: 5 locks held by kworker/1:1/28: #0: ffff888106aa4540 ( (wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297 #1: ffffc900001e7d18 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298 #2: ffff88810af571d8 ( &dev->mutex ){....}-{4:4} , at: device_lock include/linux/device.h:1102 [inline] , at: hub_event+0x1bd/0x4af0 drivers/usb/core/hub.c:5904 #3: ffff8881158cd1d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline] (&dev->mutex){....}-{4:4}, at: usb_disconnect+0x10a/0x9a0 drivers/usb/core/hub.c:2341 #4: ffff8881158c81a0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1102 [inline] #4: ffff8881158c81a0 (&dev->mutex){....}-{4:4}, at: device_del+0xa0/0x9b0 drivers/base/core.c:3923 1 lock held by khungtaskd/30: #0: ffffffff896e2b40 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffffffff896e2b40 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffffffff896e2b40 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775 3 locks held by kworker/0:2/247: #0: ffff88810006b140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297 #1: ffffc90001af7d18 ( (work_completion)(&fw_work->work) ){+.+.}-{0:0} , at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298 #2: ffff8881158c81a0 ( &dev->mutex ){....}-{4:4} , at: device_lock include/linux/device.h:1102 [inline] , at: __device_driver_lock drivers/base/dd.c:1171 [inline] , at: device_release_driver_internal+0xb2/0x620 drivers/base/dd.c:1369 2 locks held by getty/2918: #0: ffff888115d290a0 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc900000452e8 ( &ldata->atomic_read_lock ){+.+.}-{4:4} , at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211 2 locks held by kworker/0:5/5267: 2 locks held by kworker/0:11/11531: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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:122 nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65 trigger_all_cpu_backtrace include/linux/nmi.h:162 [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+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 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: 9069 Comm: kworker/0:9 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: events legacy_dvb_usb_read_remote_control RIP: 0010:__sanitizer_cov_trace_pc+0xb/0x70 kernel/kcov.c:213 Code: 5f 00 be 03 00 00 00 5b e9 e2 72 23 01 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 65 8b 05 e5 9b 4a 0b <48> 8b 34 24 65 48 8b 15 c1 9b 4a 0b a9 00 01 ff 00 74 1b f6 c4 01 RSP: 0018:ffffc900125cf238 EFLAGS: 00000216 RAX: 0000000000000001 RBX: ffffffff878ae180 RCX: ffffffff87788dd0 RDX: 0000000000000063 RSI: 000000000000002a RDI: ffff88811567bc00 RBP: ffffc900125cf2e0 R08: 0000000000000001 R09: 000000000000002a R10: 0000000000000063 R11: 0000000000b421c8 R12: 0000000000000063 R13: ffffffff878ae181 R14: ffffc900125cf370 R15: 0000000000000033 FS: 0000000000000000(0000) GS:ffff888268636000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556db20908 CR3: 00000001175ac000 CR4: 00000000003506f0 Call Trace: format_decode+0x32f/0xdd0 lib/vsprintf.c:2739 vsnprintf+0x1c0/0x1300 lib/vsprintf.c:2887 snprintf+0xc7/0x100 lib/vsprintf.c:3043 print_caller kernel/printk/printk.c:1368 [inline] info_print_prefix+0x134/0x350 kernel/printk/printk.c:1387 record_print_text+0x143/0x3c0 kernel/printk/printk.c:1434 printk_get_next_message+0x2d1/0x6c0 kernel/printk/printk.c:3072 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record+0x67c/0xe50 kernel/printk/printk.c:3269 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 _printk+0xcf/0x110 kernel/printk/printk.c:2504 legacy_dvb_usb_read_remote_control.cold+0x11/0x16 drivers/media/usb/dvb-usb/dvb-usb-remote.c:124 process_one_work+0xa23/0x1940 kernel/workqueue.c:3322 process_scheduled_works kernel/workqueue.c:3405 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x69a/0xc80 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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 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