[jirislaby:devel] [serial] 34d1a9ee59: WARNING:held_lock_freed

Hello,

kernel test robot noticed "WARNING:held_lock_freed" on:

commit: 34d1a9ee59662c2a550bddc3709519fe9e98f80b ("serial: drv->state -> xarray")
https://git.kernel.org/cgit/linux/kernel/git/jirislaby/linux.git devel

in testcase: boot

config: i386-randconfig-015-20260312
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)



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 <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]



[    4.142579][    T1] WARNING: held lock freed!
[    4.142933][    T1] 7.0.0-rc3-next-20260309-04774-g34d1a9ee5966 #1 Tainted: G                T
[    4.143637][    T1] -------------------------
[    4.143992][    T1] swapper/0/1 is freeing memory c6829400-c68297ff, with a lock still held there!
[    4.144724][    T1] c682957c (&port->mutex){+.+.}-{4:4}, at: serial_core_remove_one_port (arch/x86/include/asm/atomic.h:85 (discriminator 4) include/linux/atomic/atomic-arch-fallback.h:787 (discriminator 4) include/linux/atomic/atomic-arch-fallback.h:1238 (discriminator 4) include/linux/atomic/atomic-instrumented.h:611 (discriminator 4) drivers/tty/serial/serial_core.c:3158 (discriminator 4))
[    4.145473][    T1] 4 locks held by swapper/0/1:
[    4.145847][    T1]  #0: c3671348 (&dev->mutex){....}-{4:4}, at: device_lock (include/linux/device.h:896)
[    4.145878][    T1]  #1: c36708f8 (serial_mutex){+.+.}-{4:4}, at: serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:637 drivers/tty/serial/8250/8250_core.c:700)
[    4.145878][    T1]  #2: c3670358 (port_mutex){+.+.}-{4:4}, at: serial_core_unregister_port (drivers/tty/serial/serial_core.c:3319)
[    4.145878][    T1]  #3: c682957c (&port->mutex){+.+.}-{4:4}, at: serial_core_remove_one_port (arch/x86/include/asm/atomic.h:85 (discriminator 4) include/linux/atomic/atomic-arch-fallback.h:787 (discriminator 4) include/linux/atomic/atomic-arch-fallback.h:1238 (discriminator 4) include/linux/atomic/atomic-instrumented.h:611 (discriminator 4) drivers/tty/serial/serial_core.c:3158 (discriminator 4))
[    4.145878][    T1]
[    4.145878][    T1] stack backtrace:
[    4.145878][    T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Tainted: G                T   7.0.0-rc3-next-20260309-04774-g34d1a9ee5966 #1 PREEMPTLAZY  83767d4658804fdb707cd87f036b1fb90901c8f4
[    4.145878][    T1] Tainted: [T]=RANDSTRUCT
[    4.145878][    T1] Call Trace:
[    4.145878][    T1]  dump_stack_lvl (lib/dump_stack.c:122)
[    4.145878][    T1]  dump_stack (lib/dump_stack.c:130)
[    4.145878][    T1]  debug_check_no_locks_freed (kernel/locking/lockdep.c:6695 kernel/locking/lockdep.c:6728)
[    4.145878][    T1]  ? serial_core_remove_one_port (include/linux/mutex.h:253 (discriminator 1) drivers/tty/serial/serial_core.c:3157 (discriminator 1))
[    4.145878][    T1]  slab_free+0x32/0xa4
[    4.145878][    T1]  ? serial_core_remove_one_port (include/linux/mutex.h:253 (discriminator 1) drivers/tty/serial/serial_core.c:3157 (discriminator 1))
[    4.145878][    T1]  kfree (mm/slub.c:6487)
[    4.145878][    T1]  serial_core_remove_one_port (include/linux/mutex.h:253 (discriminator 1) drivers/tty/serial/serial_core.c:3157 (discriminator 1))
[    4.145878][    T1]  serial_core_unregister_port (drivers/tty/serial/serial_core.c:3322)
[    4.145878][    T1]  serial_ctrl_unregister_port (drivers/tty/serial/serial_ctrl.c:47)
[    4.145878][    T1]  uart_remove_one_port (drivers/tty/serial/serial_port.c:150)
[    4.145878][    T1]  serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:719)
[    4.145878][    T1]  serial8250_probe_platform (drivers/tty/serial/8250/8250_platform.c:196 (discriminator 1))
[    4.145878][    T1]  serial8250_probe (drivers/tty/serial/8250/8250_platform.c:218)
[    4.145878][    T1]  platform_probe (drivers/base/platform.c:1449 (discriminator 1))
[    4.145878][    T1]  really_probe (drivers/base/dd.c:585 drivers/base/dd.c:661)
[    4.145878][    T1]  __driver_probe_device (drivers/base/dd.c:803)
[    4.145878][    T1]  driver_probe_device (drivers/base/dd.c:834)
[    4.145878][    T1]  __device_attach_driver (drivers/base/dd.c:962)
[    4.145878][    T1]  bus_for_each_drv (drivers/base/bus.c:500)
[    4.145878][    T1]  __device_attach (drivers/base/dd.c:1033)
[    4.145878][    T1]  ? driver_probe_device (drivers/base/dd.c:925)
[    4.145878][    T1]  device_initial_probe (include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/dd.c:1090)
[    4.145878][    T1]  bus_probe_device (drivers/base/bus.c:576)
[    4.145878][    T1]  device_add (drivers/base/core.c:3696)
[    4.145878][    T1]  ? dev_set_name (drivers/base/core.c:3495)
[    4.145878][    T1]  platform_device_add (drivers/base/platform.c:758)
[    4.145878][    T1]  platform_device_register (drivers/base/platform.c:821)
[    4.145878][    T1]  accent_init (drivers/tty/serial/8250/8250_accent.c:28)
[    4.145878][    T1]  do_one_initcall (init/main.c:1384)
[    4.145878][    T1]  ? early_serial8250_rs2_setup (drivers/tty/serial/8250/8250_accent.c:27)
[    4.145878][    T1]  do_initcalls (init/main.c:1445 (discriminator 3) init/main.c:1462 (discriminator 3))
[    4.145878][    T1]  kernel_init_freeable (init/main.c:1696)
[    4.145878][    T1]  ? rest_init (init/main.c:1576)
[    4.145878][    T1]  kernel_init (init/main.c:1586)
[    4.145878][    T1]  ret_from_fork (arch/x86/kernel/process.c:164)
[    4.145878][    T1]  ? rest_init (init/main.c:1576)
[    4.145878][    T1]  ret_from_fork_asm (arch/x86/entry/entry_32.S:737)
[    4.145878][    T1]  entry_INT80_32 (arch/x86/entry/entry_32.S:945)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260316/[email protected]



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