linux-kernel - Re: [PATCH v4] tty: tty_port: add workqueue to flip tty buffer

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Message-ID: <202512041303.7192024b-lkp@intel.com>
Date: Thu, 4 Dec 2025 13:46:56 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Xin Zhao <jackzxcui1989@....com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<jirislaby@...nel.org>, <tj@...nel.org>, <hch@...radead.org>,
	<jackzxcui1989@....com>, <oliver.sang@...el.com>
Subject: Re: [PATCH v4] tty: tty_port: add workqueue to flip tty buffer



Hello,

kernel test robot noticed "sysfs:cannot_create_duplicate_filename" on:

commit: 95d87185a8405310cbbe8062ccd7be5ae753eef0 ("[PATCH v4] tty: tty_port: add workqueue to flip tty buffer")
url: https://github.com/intel-lab-lkp/linux/commits/Xin-Zhao/tty-tty_port-add-workqueue-to-flip-tty-buffer/20251129-021405
base: https://git.kernel.org/cgit/linux/kernel/git/gregkh/tty.git tty-linus
patch link: https://lore.kernel.org/all/20251128181048.429570-1-jackzxcui1989@163.com/
patch subject: [PATCH v4] tty: tty_port: add workqueue to flip tty buffer

in testcase: boot

config: x86_64-randconfig-012-20251129
compiler: gcc-14
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G

(please refer to attached dmesg/kmsg for entire log/backtrace)


+-------------------------------------------------------------------------------+------------+------------+
|                                                                               | 2bf95a9bcb | 95d87185a8 |
+-------------------------------------------------------------------------------+------------+------------+
| boot_successes                                                                | 12         | 0          |
| boot_failures                                                                 | 0          | 10         |
| sysfs:cannot_create_duplicate_filename                                        | 0          | 10         |
| Kernel_panic-not_syncing:Couldn't_allocate_pty_flip_workqueue                 | 0          | 10         |
+-------------------------------------------------------------------------------+------------+------------+


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202512041303.7192024b-lkp@intel.com


[    4.498402][    T1] fuse: init (API version 7.45)
[    4.502618][    T1] 9p: Installing v9fs 9p2000 file system support
[    4.547788][    T1] Key type asymmetric registered
[    4.552574][    T1] Asymmetric key parser 'x509' registered
[    4.553270][    T1] Asymmetric key parser 'pkcs8' registered
[    5.571435][    T1] sysfs: cannot create duplicate filename '/devices/virtual/workqueue/pty-flip-wq'
[    5.572557][    T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Tainted: G                T   6.18.0-rc3-00003-g95d87185a840 #1 PREEMPT(lazy)
[    5.573895][    T1] Tainted: [T]=RANDSTRUCT
[    5.574362][    T1] Call Trace:
[    5.574719][    T1]  <TASK>
[    5.575036][    T1]  dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:122)
[    5.575523][    T1]  sysfs_warn_dup.cold (kbuild/src/consumer/fs/sysfs/dir.c:32)
[    5.576047][    T1]  sysfs_create_dir_ns (kbuild/src/consumer/fs/sysfs/dir.c:63 (discriminator 1))
[    5.576591][    T1]  ? sysfs_create_mount_point (kbuild/src/consumer/fs/sysfs/dir.c:41)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251204/202512041303.7192024b-lkp@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki