[jirislaby:devel] [serial] 2dd9c2acfb: WARNING:held_lock_freed

kernel test robot <[email protected]>
Newsgroups dev.linux.lists.oe-lkp
Message-ID <[email protected]> 

Hello,

kernel test robot noticed "WARNING:held_lock_freed" on:

commit: 2dd9c2acfb03ee7a076cbd16ae9d3ee6f29bcd70 ("serial: drv->state -> xarray")
https://git.kernel.org/cgit/linux/kernel/git/jirislaby/linux.git devel

in testcase: boot

config: i386-randconfig-141-20251214
compiler: clang-20
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

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


+---------------------------------------------------+------------+------------+
|                                                   | bd332738e0 | 2dd9c2acfb |
+---------------------------------------------------+------------+------------+
| WARNING:held_lock_freed                           | 0          | 12         |
| is_freeing_memory#-#,with_a_lock_still_held_there | 0          | 12         |
+---------------------------------------------------+------------+------------+


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]


[    1.149928][    T1] WARNING: held lock freed!
[    1.150447][    T1] 6.18.0-next-20251209-00027-g2dd9c2acfb03 #1 Not tainted
[    1.150960][    T1] -------------------------
[    1.150960][    T1] swapper/0/1 is freeing memory 43dba800-43dbabff, with a lock still held there!
[    1.150960][    T1] 43dba9ac (&port->mutex){+.+.}-{4:4}, at: serial_core_unregister_port (arch/x86/include/asm/atomic.h:85 include/linux/atomic/atomic-arch-fallback.h:787 include/linux/atomic/atomic-arch-fallback.h:1238 include/linux/atomic/atomic-instrumented.h:611 drivers/tty/serial/serial_core.c:3151 drivers/tty/serial/serial_core.c:3312)
[    1.150960][    T1] 4 locks held by swapper/0/1:
[    1.150960][    T1]  #0: 427e8b40 (&dev->mutex){....}-{4:4}, at: __device_attach (drivers/base/dd.c:1007)
[    1.150960][    T1]  #1: 427e8240 (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)
[    1.150960][    T1]  #2: 427e7930 (port_mutex){+.+.}-{4:4}, at: serial_core_unregister_port (drivers/tty/serial/serial_core.c:3310)
[    1.150960][    T1]  #3: 43dba9ac (&port->mutex){+.+.}-{4:4}, at: serial_core_unregister_port (arch/x86/include/asm/atomic.h:85 include/linux/atomic/atomic-arch-fallback.h:787 include/linux/atomic/atomic-arch-fallback.h:1238 include/linux/atomic/atomic-instrumented.h:611 drivers/tty/serial/serial_core.c:3151 drivers/tty/serial/serial_core.c:3312)
[    1.150960][    T1]
[    1.150960][    T1] stack backtrace:
[    1.150960][    T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.18.0-next-20251209-00027-g2dd9c2acfb03 #1 PREEMPT(none)
[    1.150960][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    1.150960][    T1] Call Trace:
[    1.150960][    T1]  ? __dump_stack (lib/dump_stack.c:95)
[    1.150960][    T1]  ? dump_stack_lvl (lib/dump_stack.c:123)
[    1.150960][    T1]  ? vprintk (kernel/printk/printk_safe.c:82)
[    1.150960][    T1]  ? dump_stack (lib/dump_stack.c:129)
[    1.150960][    T1]  ? debug_check_no_locks_freed (kernel/locking/lockdep.c:6695 kernel/locking/lockdep.c:6728)
[    1.150960][    T1]  ? serial_core_unregister_port (include/linux/mutex.h:253 drivers/tty/serial/serial_core.c:3114 drivers/tty/serial/serial_core.c:3312)
[    1.150960][    T1]  ? kfree (mm/slub.c:6671 mm/slub.c:6876)
[    1.150960][    T1]  ? serial_core_unregister_port (include/linux/mutex.h:253 drivers/tty/serial/serial_core.c:3114 drivers/tty/serial/serial_core.c:3312)
[    1.150960][    T1]  ? serial_ctrl_unregister_port (drivers/tty/serial/serial_ctrl.c:47)
[    1.150960][    T1]  ? uart_remove_one_port (drivers/tty/serial/serial_port.c:150)
[    1.150960][    T1]  ? serial8250_register_8250_port (drivers/tty/serial/8250/8250_core.c:719)
[    1.150960][    T1]  ? serial8250_probe (include/linux/err.h:78 drivers/tty/serial/8250/8250_platform.c:196 drivers/tty/serial/8250/8250_platform.c:218)
[    1.150960][    T1]  ? platform_probe (drivers/base/platform.c:?)
[    1.150960][    T1]  ? really_probe (drivers/base/dd.c:583 drivers/base/dd.c:659)
[    1.150960][    T1]  ? __driver_probe_device (drivers/base/dd.c:801)
[    1.150960][    T1]  ? driver_probe_device (drivers/base/dd.c:831)
[    1.150960][    T1]  ? platform_match (drivers/base/platform.c:?)
[    1.150960][    T1]  ? __device_attach_driver (drivers/base/dd.c:960)
[    1.150960][    T1]  ? bus_for_each_drv (drivers/base/bus.c:500)
[    1.150960][    T1]  ? __pm_runtime_resume (drivers/base/power/runtime.c:1200)
[    1.150960][    T1]  ? __device_attach (drivers/base/dd.c:1031)
[    1.150960][    T1]  ? deferred_devs_show (drivers/base/dd.c:923)
[    1.150960][    T1]  ? device_initial_probe (drivers/base/dd.c:?)
[    1.150960][    T1]  ? bus_probe_device (drivers/base/bus.c:576)
[    1.150960][    T1]  ? device_add (drivers/base/core.c:3696)
[    1.150960][    T1]  ? dev_set_name (drivers/base/core.c:3494)
[    1.150960][    T1]  ? platform_device_add (drivers/base/platform.c:757)
[    1.150960][    T1]  ? platform_device_register (drivers/base/platform.c:820)
[    1.150960][    T1]  ? exar_init (drivers/tty/serial/8250/8250_exar_st16c554.c:33)
[    1.150960][    T1]  ? do_one_initcall (init/main.c:1378)
[    1.150960][    T1]  ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[    1.150960][    T1]  ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[    1.150960][    T1]  ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309)
[    1.150960][    T1]  ? __lock_acquire (kernel/locking/lockdep.c:4674 kernel/locking/lockdep.c:5191)
[    1.150960][    T1]  ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[    1.150960][    T1]  ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[    1.150960][    T1]  ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309)
[    1.150960][    T1]  ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91)
[    1.150960][    T1]  ? sched_clock_noinstr (arch/x86/kernel/tsc.c:272)
[    1.150960][    T1]  ? local_clock_noinstr (kernel/sched/clock.c:272 kernel/sched/clock.c:309)
[    1.150960][    T1]  ? local_clock (arch/x86/include/asm/preempt.h:95 kernel/sched/clock.c:319)
[    1.150960][    T1]  ? irqtime_account_irq (kernel/sched/cputime.c:?)
[    1.150960][    T1]  ? irqtime_account_delta (include/linux/seqlock.h:452 include/linux/seqlock.h:524 include/linux/u64_stats_sync.h:152 include/linux/u64_stats_sync.h:188 kernel/sched/cputime.c:49)
[    1.150960][    T1]  ? trace_hardirqs_on (kernel/trace/trace_preemptirq.c:80)
[    1.150960][    T1]  ? irqentry_exit (kernel/entry/common.c:?)
[    1.150960][    T1]  ? common_interrupt (arch/x86/kernel/irq.c:319)
[    1.150960][    T1]  ? asm_common_interrupt (arch/x86/include/asm/idtentry.h:688)
[    1.150960][    T1]  ? strlen (arch/x86/lib/string_32.c:?)
[    1.150960][    T1]  ? next_arg (lib/cmdline.c:273)
[    1.150960][    T1]  ? parameq (kernel/params.c:90 kernel/params.c:99)
[    1.150960][    T1]  ? exar_pci_driver_init (drivers/tty/serial/8250/8250_exar_st16c554.c:32)
[    1.150960][    T1]  ? do_initcall_level (init/main.c:1439)
[    1.150960][    T1]  ? do_initcalls (init/main.c:1453)
[    1.150960][    T1]  ? rest_init (init/main.c:1570)
[    1.150960][    T1]  ? do_basic_setup (init/main.c:1476)
[    1.150960][    T1]  ? kernel_init_freeable (init/main.c:1690)
[    1.150960][    T1]  ? kernel_init (init/main.c:1580)
[    1.150960][    T1]  ? ret_from_fork (arch/x86/kernel/process.c:164)
[    1.150960][    T1]  ? __switch_to_asm (arch/x86/entry/entry_32.S:704)
[    1.150960][    T1]  ? __switch_to_asm (arch/x86/entry/entry_32.S:704)
[    1.150960][    T1]  ? rest_init (init/main.c:1570)
[    1.150960][    T1]  ? ret_from_fork_asm (arch/x86/entry/entry_32.S:737)
[    1.150960][    T1]  ? entry_INT80_32 (arch/x86/entry/entry_32.S:945)
[    1.368042][    T1] CHRDEV "ttyARC" minor range requested (0-4294967294) is out of range of maximum range (0-1048575) for a single major
[    1.369474][    T1] CHRDEV "ttyLP" minor range requested (0-4294967294) is out of range of maximum range (0-1048575) for a single major
[    1.370859][    T1] CHRDEV "ttySIF" minor range requested (0-4294967294) is out of range of maximum range (0-1048575) for a single major
[    1.385171][    T1] Rounding down aligned max_sectors from 4294967295 to 4294967288
[    1.387226][    T1] db_root: cannot open: /etc/target



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251217/[email protected]



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