linux-kernel - [linux-next:master] [tty] d000422a46: sysfs:cannot_create_duplicate

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Message-ID: <202601282134.b947eae9-lkp@intel.com>
Date: Wed, 28 Jan 2026 22:09:48 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Xin Zhao <jackzxcui1989@....com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Greg Kroah-Hartman
	<gregkh@...uxfoundation.org>, Jiri Slaby <jirislaby@...nel.org>,
	<linux-kernel@...r.kernel.org>, <linux-serial@...r.kernel.org>,
	<oliver.sang@...el.com>
Subject: [linux-next:master] [tty]  d000422a46:
 sysfs:cannot_create_duplicate_filename



Hello,

kernel test robot noticed "sysfs:cannot_create_duplicate_filename" on:

commit: d000422a46aad32217cf1be747eb61d641baae2f ("tty: tty_port: add workqueue to flip TTY buffer")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

[test failed on linux-next/master 615aad0f61e0c7a898184a394dc895c610100d4f]

in testcase: boot

config: x86_64-randconfig-003-20260127
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G

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



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/202601282134.b947eae9-lkp@intel.com



[   90.273010][    T1] gpio_winbond: not an our chip
[   90.276100][    T1] ledtrig-cpu: registered to indicate activity on CPUs
[   90.315441][    T1] Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
[   90.322749][    T1] 00:04: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A
[   90.330210][    T1] 00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[   90.348052][    T1] sysfs: cannot create duplicate filename '/devices/virtual/workqueue/ttyS-flip-wq'
[   90.352197][    T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0-rc3-00049-gd000422a46aa #1 VOLUNTARY  96515dc2651f95070d1b72690dc313e8c588745e
[   90.352235][    T1] Call Trace:
[   90.352248][    T1]  <TASK>
[   90.352300][    T1]  __dump_stack (kbuild/src/consumer/lib/dump_stack.c:95)
[   90.352413][    T1]  dump_stack_lvl (kbuild/src/consumer/lib/dump_stack.c:123 (discriminator 1))
[   90.352430][    T1]  dump_stack (kbuild/src/consumer/lib/dump_stack.c:130)
[   90.352440][    T1]  sysfs_warn_dup (kbuild/src/consumer/fs/sysfs/dir.c:32)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260128/202601282134.b947eae9-lkp@intel.com



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