linux-kernel - Re: [syzbot] [usb?] INFO: task hung in hub_port

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Message-ID: <0000000000006e018d06094f1ba1@google.com>
Date:   Sat, 04 Nov 2023 01:07:07 -0700
From:   syzbot <syzbot+b6f11035e572f08bc20f@...kaller.appspotmail.com>
To:     hdanton@...a.com, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [usb?] INFO: task hung in hub_port_init (3)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
kernel panic: KASAN: panic_on_warn set ...

>ffff888020985500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                    ^
 ffff888020985580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff888020985600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: KASAN: panic_on_warn set ...
CPU: 0 PID: 2911 Comm: kworker/u4:13 Not tainted 6.6.0-syzkaller-14142-g90b0c2b2edd1-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
Workqueue: usbip_event event_handler
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
 panic+0x349/0x850 kernel/panic.c:344
 check_panic_on_warn+0x82/0xa0 kernel/panic.c:237
 end_report+0x6e/0x130 mm/kasan/report.c:225
 kasan_report+0x153/0x170 mm/kasan/report.c:590
 pickup_urb_and_free_priv+0x282/0x370 drivers/usb/usbip/vhci_rx.c:24
 vhci_cleanup_unlink_list+0x12d/0x490 drivers/usb/usbip/vhci_hcd.c:966
 vhci_device_unlink_cleanup drivers/usb/usbip/vhci_hcd.c:1000 [inline]
 vhci_shutdown_connection+0x203/0x4a0 drivers/usb/usbip/vhci_hcd.c:1037
 event_handler+0x24e/0x4b0 drivers/usb/usbip/usbip_event.c:79
 process_one_work kernel/workqueue.c:2630 [inline]
 process_scheduled_works+0x90f/0x1400 kernel/workqueue.c:2703
 worker_thread+0xa5f/0xff0 kernel/workqueue.c:2784
 kthread+0x2d3/0x370 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..


Tested on:

commit:         90b0c2b2 Merge tag 'pinctrl-v6.7-1' of git://git.kerne..
git tree:       https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=11d567f3680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=93ac5233c138249e
dashboard link: https://syzkaller.appspot.com/bug?extid=b6f11035e572f08bc20f
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
patch:          https://syzkaller.appspot.com/x/patch.diff?x=15c49eeb680000