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

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Message-ID: <6870ffcd.a00a0220.26a83e.0048.GAE@google.com>
Date: Fri, 11 Jul 2025 05:13:01 -0700
From: syzbot <syzbot+592e2ab8775dbe0bf09a@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, penguin-kernel@...ove.sakura.ne.jp, 
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [kernel?] INFO: task hung in uevent_show (2)

Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
INFO: task hung in usbdev_ioctl

INFO: task syz.2.18:6951 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc5-syzkaller-00121-gbc9ff192a6c9-dirty #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.18        state:D stack:26472 pid:6951  tgid:6949  ppid:6668   task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5401 [inline]
 __schedule+0x16a2/0x4cb0 kernel/sched/core.c:6790
 __schedule_loop kernel/sched/core.c:6868 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6883
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6940
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x65d/0xc70 kernel/locking/mutex.c:747
 device_lock include/linux/device.h:884 [inline]
 usbdev_do_ioctl drivers/usb/core/devio.c:2611 [inline]
 usbdev_ioctl+0x140/0x20c0 drivers/usb/core/devio.c:2827
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:893
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8b3f58d169
RSP: 002b:00007f8b3f3f7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8b3f7a5fa0 RCX: 00007f8b3f58d169


Tested on:

commit:         bc9ff192 Merge tag 'net-6.16-rc6' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10a8dbd4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f481202e4ff2d138
dashboard link: https://syzkaller.appspot.com/bug?extid=592e2ab8775dbe0bf09a
compiler:       Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7
patch:          https://syzkaller.appspot.com/x/patch.diff?x=1166668c580000