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2023 05:19:46.0103 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Hwp+8EWlsn++v7sTlh5hvLCgRVC8h6Uaa3Ik9k56DxrcWTZj2NQCdmp42UoX2RKhuNAez/HSnydzgUHCHIp/Fw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB8563 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, kernel test robot noticed "WARNING:possible_recursive_locking_detected" on: commit: d132b3de19193c996402718d76e63f797d4259a9 ("[PATCH/RFC] debugobjects/slub: Print slab info and backtrace.") url: https://github.com/intel-lab-lkp/linux/commits/greearb-candelatech-com/debugobjects-slub-Print-slab-info-and-backtrace/20231103-093945 base: git://git.kernel.org/cgit/linux/kernel/git/vbabka/slab.git for-next patch link: https://lore.kernel.org/all/20231103013704.1232723-1-greearb@candelatech.com/ patch subject: [PATCH/RFC] debugobjects/slub: Print slab info and backtrace. in testcase: boot compiler: gcc-7 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (please refer to attached dmesg/kmsg for entire log/backtrace) the issue doesn't always happen for this commit in our tests (shows 39 times in 50 runs), but keeps clean on parent. 90f055df112162fd d132b3de19193c996402718d76e ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :51 76% 39:50 dmesg.WARNING:possible_recursive_locking_detected :51 76% 39:50 dmesg.WARNING:possible_recursive_locking_detected_swapper_is_trying_to_acquire_lock:at:__debug_check_no_obj_freed_but_task_is_already_holding_lock:at:__debug_object_init/0x 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 | Closes: https://lore.kernel.org/oe-lkp/202311091331.f2eaf4f7-oliver.sang@intel.com [ 2.997328][ T1] WARNING: possible recursive locking detected [ 2.997927][ T1] 6.6.0-rc4-00006-gd132b3de1919 #1 Tainted: G T [ 2.997927][ T1] -------------------------------------------- [ 2.997927][ T1] swapper/1 is trying to acquire lock: [ 2.997927][ T1] ffffffff85425790 (&obj_hash[i].lock){..-.}-{2:2}, at: __debug_check_no_obj_freed (lib/debugobjects.c:1057) [ 2.997927][ T1] [ 2.997927][ T1] but task is already holding lock: [ 2.997927][ T1] ffffffff8531abc0 (&obj_hash[i].lock){..-.}-{2:2}, at: __debug_object_init (lib/debugobjects.c:528 lib/debugobjects.c:667) [ 2.997927][ T1] [ 2.997927][ T1] other info that might help us debug this: [ 2.997927][ T1] Possible unsafe locking scenario: [ 2.997927][ T1] [ 2.997927][ T1] CPU0 [ 2.997927][ T1] ---- [ 2.997927][ T1] lock(&obj_hash[i].lock); [ 2.997927][ T1] [ 2.997927][ T1] *** DEADLOCK *** [ 2.997927][ T1] [ 2.997927][ T1] May be due to missing lock nesting notation [ 2.997927][ T1] [ 2.997927][ T1] 1 lock held by swapper/1: [ 2.997927][ T1] #0: ffffffff8531abc0 (&obj_hash[i].lock){..-.}-{2:2}, at: __debug_object_init (lib/debugobjects.c:528 lib/debugobjects.c:667) [ 2.997927][ T1] [ 2.997927][ T1] stack backtrace: [ 2.997927][ T1] CPU: 0 PID: 1 Comm: swapper Tainted: G T 6.6.0-rc4-00006-gd132b3de1919 #1 2ef50b864013db82ef063ed2d8014756ac6c0996 [ 2.997927][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 2.997927][ T1] Call Trace: [ 2.997927][ T1] [ 2.997927][ T1] __lock_acquire (kernel/locking/lockdep.c:5137) [ 2.997927][ T1] ? local_clock (arch/x86/include/asm/preempt.h:85 kernel/sched/clock.c:316) [ 2.997927][ T1] ? lock_release (kernel/locking/lockdep.c:223 kernel/locking/lockdep.c:352 kernel/locking/lockdep.c:5435 kernel/locking/lockdep.c:5773) [ 2.997927][ T1] lock_acquire (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5755) [ 2.997927][ T1] ? __debug_check_no_obj_freed (lib/debugobjects.c:1057) [ 2.997927][ T1] _raw_spin_lock_irqsave (include/linux/spinlock_api_smp.h:111 kernel/locking/spinlock.c:162) [ 2.997927][ T1] ? __debug_check_no_obj_freed (lib/debugobjects.c:1057) [ 2.997927][ T1] __debug_check_no_obj_freed (lib/debugobjects.c:1057) [ 2.997927][ T1] ? local_clock (arch/x86/include/asm/preempt.h:85 kernel/sched/clock.c:316) [ 2.997927][ T1] ? lock_release (kernel/locking/lockdep.c:223 kernel/locking/lockdep.c:352 kernel/locking/lockdep.c:5435 kernel/locking/lockdep.c:5773) [ 2.997927][ T1] free_unref_page_prepare (mm/page_alloc.c:1146 mm/page_alloc.c:2312) [ 2.997927][ T1] ? find_held_lock (kernel/locking/lockdep.c:5243) [ 2.997927][ T1] free_unref_page (mm/page_alloc.c:2405) [ 2.997927][ T1] __stack_depot_save (lib/stackdepot.c:443) [ 2.997927][ T1] set_track_prepare (mm/kmemleak.c:620) [ 2.997927][ T1] ? pm_runtime_init (drivers/base/power/runtime.c:1731) [ 2.997927][ T1] ? device_initialize (drivers/base/core.c:3102) [ 2.997927][ T1] ? device_register (drivers/base/core.c:3706) [ 2.997927][ T1] ? subsys_register (drivers/base/bus.c:1230) [ 2.997927][ T1] ? container_dev_init (drivers/base/container.c:39) [ 2.997927][ T1] ? kernel_init_freeable (init/main.c:1327 init/main.c:1547) [ 2.997927][ T1] ? kernel_init (init/main.c:1439) [ 2.997927][ T1] ? ret_from_fork (arch/x86/kernel/process.c:153) [ 2.997927][ T1] ? ret_from_fork_asm (arch/x86/entry/entry_64.S:312) [ 2.997927][ T1] lookup_object_or_alloc (lib/debugobjects.c:308 lib/debugobjects.c:624) [ 2.997927][ T1] __debug_object_init (lib/debugobjects.c:672) [ 2.997927][ T1] pm_runtime_init (drivers/base/power/runtime.c:1731) [ 2.997927][ T1] device_initialize (drivers/base/core.c:3102) [ 2.997927][ T1] device_register (drivers/base/core.c:3706) [ 2.997927][ T1] subsys_register (drivers/base/bus.c:1230) [ 2.997927][ T1] container_dev_init (drivers/base/container.c:39) [ 2.997927][ T1] kernel_init_freeable (init/main.c:1327 init/main.c:1547) [ 2.997927][ T1] ? wait_for_completion (kernel/sched/completion.c:149) [ 2.997927][ T1] ? rest_init (init/main.c:1429) [ 2.997927][ T1] kernel_init (init/main.c:1439) [ 2.997927][ T1] ret_from_fork (arch/x86/kernel/process.c:153) [ 2.997927][ T1] ? rest_init (init/main.c:1429) [ 2.997927][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:312) [ 2.997927][ T1] [ 3.000434][ T1] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns [ 3.001966][ T1] futex hash table entries: 256 (order: 2, 24576 bytes, linear) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20231109/202311091331.f2eaf4f7-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki