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23f648a3-529d-428f-a58b-08de58aba09c X-MS-Exchange-CrossTenant-AuthSource: LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jan 2026 05:12:09.2800 (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: XKX7cMxs2IJRXQMMpJ65hviMIAnpO2zDAu3CbYA+gmFXQDu3pab3S26q8qA7BLsIL4hFmWaQOPL3NKLVLEG0IQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR11MB8814 X-OriginatorOrg: intel.com Hello, FYI. we don't have enough knowledge to understand how the issues we found in the tests are related with the code. we just run the tests up to 200 times for both this commit and parent, noticed there are various random issues on this commit, but always clean on parent. ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/sleep: vm-snb/boot/debian-11.1-i386-20220923.cgz/i386-randconfig-141-20260117/gcc-14/1 29317f8dc6ed601e bc62f5b308cbdedf29132fe96e9 ---------------- --------------------------- fail:runs %reproduction fail:runs | | | :200 2% 5:200 dmesg.BUG:soft_lockup-CPU##stuck_for#s![kworker##:#] :200 2% 5:200 dmesg.BUG:soft_lockup-CPU##stuck_for#s![kworker:#:#] :200 8% 17:200 dmesg.BUG:soft_lockup-CPU##stuck_for#s![swapper:#] :200 2% 4:200 dmesg.BUG:workqueue_lockup-pool :200 0% 1:200 dmesg.EIP:__schedule :200 0% 1:200 dmesg.EIP:_raw_spin_unlock_irq :200 2% 4:200 dmesg.EIP:_raw_spin_unlock_irqrestore :200 6% 11:200 dmesg.EIP:console_emit_next_record :200 0% 1:200 dmesg.EIP:finish_task_switch :200 3% 6:200 dmesg.EIP:lock_acquire :200 1% 2:200 dmesg.EIP:lock_release :200 1% 2:200 dmesg.EIP:queue_work_on :200 0% 1:200 dmesg.EIP:rcu_preempt_deferred_qs_irqrestore :200 1% 2:200 dmesg.EIP:timekeeping_notify :200 0% 1:200 dmesg.INFO:rcu_preempt_detected_stalls_on_CPUs/tasks :200 0% 1:200 dmesg.INFO:task_blocked_for_more_than#seconds :200 14% 27:200 dmesg.Kernel_panic-not_syncing:softlockup:hung_tasks below is full report. kernel test robot noticed "BUG:soft_lockup-CPU##stuck_for#s![kworker:#:#]" on: commit: bc62f5b308cbdedf29132fe96e9d591e526527e1 ("dax/hmem, e820, resource: Defer Soft Reserved insertion until hmem is ready") https://git.kernel.org/cgit/linux/kernel/git/cxl/cxl.git for-7.0/cxl-init in testcase: boot config: i386-randconfig-141-20260117 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 | Closes: https://lore.kernel.org/oe-lkp/202601211001.82fe0f1b-lkp@intel.com [ 674.140379][ C0] watchdog: BUG: soft lockup - CPU#0 stuck for 626s! [kworker/0:2:18] [ 674.140379][ C0] Modules linked in: [ 674.140379][ C0] irq event stamp: 192928 [ 674.140379][ C0] hardirqs last enabled at (192927): rcu_preempt_deferred_qs_irqrestore (arch/x86/include/asm/irqflags.h:26 arch/x86/include/asm/irqflags.h:109 arch/x86/include/asm/irqflags.h:151 kernel/rcu/tree_plugin.h:587) [ 674.140379][ C0] hardirqs last disabled at (192928): sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1056) [ 674.140379][ C0] softirqs last enabled at (192850): handle_softirqs (kernel/softirq.c:469 (discriminator 2) kernel/softirq.c:650 (discriminator 2)) [ 674.140379][ C0] softirqs last disabled at (192839): __do_softirq (kernel/softirq.c:657) [ 674.140379][ C0] CPU: 0 UID: 0 PID: 18 Comm: kworker/0:2 Not tainted 6.19.0-rc4-00007-gbc62f5b308cb #1 PREEMPT(lazy) 9b7ba6dd04fa63ebf0e343a2cc1c803e2e6231bd [ 674.140379][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 674.140379][ C0] Workqueue: rcu_gp strict_work_handler [ 674.140379][ C0] EIP: lock_release (kernel/locking/lockdep.c:5893) [ 674.140379][ C0] Code: b8 ff ff ff ff 0f c1 05 48 c2 ff c3 48 0f 85 95 00 00 00 9c 58 f6 c4 02 0f 85 aa 00 00 00 81 e7 00 02 00 00 74 01 fb 8d 65 f4 <5b> 5e 5f 5d c3 2e 8d b4 26 00 00 00 00 90 ff 05 14 e0 e7 c3 a1 5c All code ======== 0: b8 ff ff ff ff mov $0xffffffff,%eax 5: 0f c1 05 48 c2 ff c3 xadd %eax,-0x3c003db8(%rip) # 0xffffffffc3ffc254 c: 48 0f 85 95 00 00 00 rex.W jne 0xa8 13: 9c pushf 14: 58 pop %rax 15: f6 c4 02 test $0x2,%ah 18: 0f 85 aa 00 00 00 jne 0xc8 1e: 81 e7 00 02 00 00 and $0x200,%edi 24: 74 01 je 0x27 26: fb sti 27: 8d 65 f4 lea -0xc(%rbp),%esp 2a:* 5b pop %rbx <-- trapping instruction 2b: 5e pop %rsi 2c: 5f pop %rdi 2d: 5d pop %rbp 2e: c3 ret 2f: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 36: 00 37: 90 nop 38: ff 05 14 e0 e7 c3 incl -0x3c181fec(%rip) # 0xffffffffc3e7e052 3e: a1 .byte 0xa1 3f: 5c pop %rsp Code starting with the faulting instruction =========================================== 0: 5b pop %rbx 1: 5e pop %rsi 2: 5f pop %rdi 3: 5d pop %rbp 4: c3 ret 5: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi c: 00 d: 90 nop e: ff 05 14 e0 e7 c3 incl -0x3c181fec(%rip) # 0xffffffffc3e7e028 14: a1 .byte 0xa1 15: 5c pop %rsp [ 674.140379][ C0] EAX: 00000047 EBX: c54814c0 ECX: c5622508 EDX: ffffffff [ 674.140379][ C0] ESI: c122e710 EDI: 00000200 EBP: c562def4 ESP: c562dee8 [ 674.140379][ C0] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00000206 [ 674.140379][ C0] CR0: 80050033 CR2: ffda9000 CR3: 047db000 CR4: 00040690 [ 674.140379][ C0] Call Trace: [ 674.140379][ C0] process_one_work (kernel/workqueue.c:3268) [ 674.140379][ C0] worker_thread (kernel/workqueue.c:3334 (discriminator 2) kernel/workqueue.c:3421 (discriminator 2)) [ 674.140379][ C0] kthread (kernel/kthread.c:463) [ 674.140379][ C0] ? rescuer_thread (kernel/workqueue.c:3367) [ 674.140379][ C0] ? kthread_unpark (kernel/kthread.c:412) [ 674.140379][ C0] ret_from_fork (arch/x86/kernel/process.c:164) [ 674.140379][ C0] ? kthread_unpark (kernel/kthread.c:412) [ 674.140379][ C0] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 674.140379][ C0] entry_INT80_32 (arch/x86/entry/entry_32.S:945) [ 674.140379][ C0] Kernel panic - not syncing: softlockup: hung tasks [ 674.140379][ C0] CPU: 0 UID: 0 PID: 18 Comm: kworker/0:2 Tainted: G L 6.19.0-rc4-00007-gbc62f5b308cb #1 PREEMPT(lazy) 9b7ba6dd04fa63ebf0e343a2cc1c803e2e6231bd [ 674.140379][ C0] Tainted: [L]=SOFTLOCKUP [ 674.140379][ C0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 674.140379][ C0] Workqueue: rcu_gp strict_work_handler [ 674.140379][ C0] Call Trace: [ 674.140379][ C0] dump_stack_lvl (lib/dump_stack.c:122) [ 674.140379][ C0] dump_stack (lib/dump_stack.c:130) [ 674.140379][ C0] vpanic (kernel/panic.c:487) [ 674.140379][ C0] panic (kernel/panic.c:365) [ 674.140379][ C0] watchdog_timer_fn.cold (kernel/watchdog.c:869) [ 674.140379][ C0] ? softlockup_fn (kernel/watchdog.c:781) [ 674.140379][ C0] __hrtimer_run_queues+0xa4/0x380 [ 674.140379][ C0] hrtimer_run_queues (kernel/time/hrtimer.c:1999) [ 674.140379][ C0] update_process_times (kernel/time/timer.c:2455 (discriminator 3) kernel/time/timer.c:2473 (discriminator 3)) [ 674.140379][ C0] tick_periodic+0x33/0x100 [ 674.140379][ C0] tick_handle_periodic (kernel/time/tick-common.c:130) [ 674.140379][ C0] ? vmware_sched_clock (arch/x86/kernel/apic/apic.c:1056) [ 674.140379][ C0] __sysvec_apic_timer_interrupt (arch/x86/include/asm/trace/irq_vectors.h:40 (discriminator 4) arch/x86/include/asm/trace/irq_vectors.h:40 (discriminator 4) arch/x86/kernel/apic/apic.c:1063 (discriminator 4)) [ 674.140379][ C0] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1056 (discriminator 2) arch/x86/kernel/apic/apic.c:1056 (discriminator 2)) [ 674.140379][ C0] ? process_one_work (kernel/workqueue.c:3266) [ 674.140379][ C0] handle_exception (arch/x86/entry/entry_32.S:1048) [ 674.140379][ C0] EIP: lock_release (kernel/locking/lockdep.c:5893) [ 674.140379][ C0] Code: b8 ff ff ff ff 0f c1 05 48 c2 ff c3 48 0f 85 95 00 00 00 9c 58 f6 c4 02 0f 85 aa 00 00 00 81 e7 00 02 00 00 74 01 fb 8d 65 f4 <5b> 5e 5f 5d c3 2e 8d b4 26 00 00 00 00 90 ff 05 14 e0 e7 c3 a1 5c All code ======== 0: b8 ff ff ff ff mov $0xffffffff,%eax 5: 0f c1 05 48 c2 ff c3 xadd %eax,-0x3c003db8(%rip) # 0xffffffffc3ffc254 c: 48 0f 85 95 00 00 00 rex.W jne 0xa8 13: 9c pushf 14: 58 pop %rax 15: f6 c4 02 test $0x2,%ah 18: 0f 85 aa 00 00 00 jne 0xc8 1e: 81 e7 00 02 00 00 and $0x200,%edi 24: 74 01 je 0x27 26: fb sti 27: 8d 65 f4 lea -0xc(%rbp),%esp 2a:* 5b pop %rbx <-- trapping instruction 2b: 5e pop %rsi 2c: 5f pop %rdi 2d: 5d pop %rbp 2e: c3 ret 2f: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi 36: 00 37: 90 nop 38: ff 05 14 e0 e7 c3 incl -0x3c181fec(%rip) # 0xffffffffc3e7e052 3e: a1 .byte 0xa1 3f: 5c pop %rsp Code starting with the faulting instruction =========================================== 0: 5b pop %rbx 1: 5e pop %rsi 2: 5f pop %rdi 3: 5d pop %rbp 4: c3 ret 5: 2e 8d b4 26 00 00 00 cs lea 0x0(%rsi,%riz,1),%esi c: 00 d: 90 nop e: ff 05 14 e0 e7 c3 incl -0x3c181fec(%rip) # 0xffffffffc3e7e028 14: a1 .byte 0xa1 15: 5c pop %rsp The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260121/202601211001.82fe0f1b-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki