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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hello, kernel test robot noticed "BUG:using_smp_processor_id()in_preemptible" on: commit: de840681a162e0a5a0862e7a0b495fb34deab7ef ("slab: remove cpu (partial) slabs usage from allocation paths") https://git.kernel.org/cgit/linux/kernel/git/vbabka/linux.git b4/sheaves-for-all in testcase: boot config: i386-randconfig-002-20251015 compiler: gcc-14 test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G (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/202510161416.b7adda58-lkp@intel.com [ 2.688724][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.690336][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.692339][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.693316][ T2] Tainted: [T]=RANDSTRUCT [ 2.693316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.693316][ T2] Call Trace: [ 2.693316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.693316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.693316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.693316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.693316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.693316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.693316][ T2] ? copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.693316][ T2] kmem_cache_alloc_node_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4993) [ 2.693316][ T2] ? copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.693316][ T2] copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.693316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.693316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.693316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.693316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.693316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.693316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.693316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.693316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.693316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.693316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.693386][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.695335][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.697340][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.698316][ T2] Tainted: [T]=RANDSTRUCT [ 2.698316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.698316][ T2] Call Trace: [ 2.698316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.698316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.698316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.698316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.698316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.698316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.698316][ T2] ? __set_page_owner (mm/page_owner.c:173 mm/page_owner.c:214 mm/page_owner.c:333) [ 2.698316][ T2] __kmalloc_cache_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:5455) [ 2.698316][ T2] ? __set_page_owner (mm/page_owner.c:173 mm/page_owner.c:214 mm/page_owner.c:333) [ 2.698316][ T2] __set_page_owner (mm/page_owner.c:173 mm/page_owner.c:214 mm/page_owner.c:333) [ 2.698316][ T2] post_alloc_hook (mm/page_alloc.c:1852) [ 2.698316][ T2] prep_new_page (mm/page_alloc.c:1860) [ 2.698316][ T2] get_page_from_freelist (mm/page_alloc.c:3890 (discriminator 1)) [ 2.698316][ T2] __alloc_frozen_pages_noprof (mm/page_alloc.c:5184 (discriminator 1)) [ 2.698316][ T2] __alloc_pages_noprof (mm/page_alloc.c:5218) [ 2.698316][ T2] copy_process (kernel/fork.c:367 (discriminator 1) kernel/fork.c:881 (discriminator 1) kernel/fork.c:2012 (discriminator 1)) [ 2.698316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.698316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.698316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.698316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.698316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.698316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.698316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.698316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.698316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.698316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.698369][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.700334][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.702016][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.702316][ T2] Tainted: [T]=RANDSTRUCT [ 2.702316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.702316][ T2] Call Trace: [ 2.702316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.702316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.702316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.702316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.702316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.702316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.702316][ T2] ? prepare_creds (kernel/cred.c:213) [ 2.702316][ T2] kmem_cache_alloc_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4948) [ 2.702316][ T2] ? prepare_creds (kernel/cred.c:213) [ 2.702316][ T2] prepare_creds (kernel/cred.c:213) [ 2.702316][ T2] copy_creds (kernel/cred.c:314) [ 2.702316][ T2] copy_process (kernel/fork.c:2046) [ 2.702316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.702316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.702316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.702316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.702316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.702316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.702316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.702316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.702316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.702316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.703358][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.705335][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.707023][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.707316][ T2] Tainted: [T]=RANDSTRUCT [ 2.707316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.707316][ T2] Call Trace: [ 2.707316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.707316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.707316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.707316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.707316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.707316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.707316][ T2] ? set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.707316][ T2] __kmalloc_cache_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:5455) [ 2.707316][ T2] ? set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.707316][ T2] set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.707316][ T2] copy_process (kernel/fork.c:2110 (discriminator 1)) [ 2.707316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.707316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.707316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.707316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.707316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.707316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.707316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.707316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.707316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.707316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.707369][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.710331][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.712340][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.713316][ T2] Tainted: [T]=RANDSTRUCT [ 2.713316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.713316][ T2] Call Trace: [ 2.713316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.713316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.713316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.713316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.713316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.713316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.713316][ T2] ? copy_sighand (kernel/fork.c:1611 (discriminator 2)) [ 2.713316][ T2] kmem_cache_alloc_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4948) [ 2.713316][ T2] ? copy_sighand (kernel/fork.c:1611 (discriminator 2)) [ 2.713316][ T2] copy_sighand (kernel/fork.c:1611 (discriminator 2)) [ 2.713316][ T2] copy_process (kernel/fork.c:2176) [ 2.713316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.713316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.713316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.713316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.713316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.713316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.713316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.713316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.713316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.713316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.713362][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.715337][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.717345][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.718316][ T2] Tainted: [T]=RANDSTRUCT [ 2.718316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.718316][ T2] Call Trace: [ 2.718316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.718316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.718316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.718316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.718316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.718316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.718316][ T2] ? copy_signal (kernel/fork.c:1659 (discriminator 2)) [ 2.718316][ T2] kmem_cache_alloc_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4948) [ 2.718316][ T2] ? copy_signal (kernel/fork.c:1659 (discriminator 2)) [ 2.718316][ T2] copy_signal (kernel/fork.c:1659 (discriminator 2)) [ 2.718316][ T2] copy_process (kernel/fork.c:2179) [ 2.718316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.718316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.718316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.718316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.718316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.718316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.718316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.718316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.718316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.718316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.718387][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.720336][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.722027][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.722316][ T2] Tainted: [T]=RANDSTRUCT [ 2.722316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.722316][ T2] Call Trace: [ 2.722316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.722316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.722316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.722316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.722316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.722316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.722316][ T2] ? alloc_pid (kernel/pid.c:184 (discriminator 2)) [ 2.722316][ T2] kmem_cache_alloc_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4948) [ 2.722316][ T2] ? alloc_pid (kernel/pid.c:184 (discriminator 2)) [ 2.722316][ T2] alloc_pid (kernel/pid.c:184 (discriminator 2)) [ 2.722316][ T2] copy_process (kernel/fork.c:2197) [ 2.722316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.722316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.722316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.722316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.722316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.722316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.722316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.722316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.722316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.722316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.722693][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.724339][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.726341][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.727316][ T2] Tainted: [T]=RANDSTRUCT [ 2.727316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.727316][ T2] Call Trace: [ 2.727316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.727316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.727316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.727316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.727316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.727316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.727316][ T2] ? copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.727316][ T2] kmem_cache_alloc_node_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4993) [ 2.727316][ T2] ? copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.727316][ T2] copy_process (kernel/fork.c:184 (discriminator 2) kernel/fork.c:873 (discriminator 2) kernel/fork.c:2012 (discriminator 2)) [ 2.727316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.727316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.727316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.727316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.727316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.727316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.727316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.727316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.727316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.727316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.727388][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.729337][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.731340][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.732316][ T2] Tainted: [T]=RANDSTRUCT [ 2.732316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.732316][ T2] Call Trace: [ 2.732316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.732316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.732316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.732316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.732316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.732316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.732316][ T2] ? prepare_creds (kernel/cred.c:213) [ 2.732316][ T2] kmem_cache_alloc_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:4948) [ 2.732316][ T2] ? prepare_creds (kernel/cred.c:213) [ 2.732316][ T2] prepare_creds (kernel/cred.c:213) [ 2.732316][ T2] copy_creds (kernel/cred.c:314) [ 2.732316][ T2] copy_process (kernel/fork.c:2046) [ 2.732316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.732316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.732316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.732316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.732316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.732316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.732316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.732316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.732316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.732316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) [ 2.732364][ T2] BUG: using smp_processor_id() in preemptible [00000000] code: kthreadd/2 [ 2.734337][ T2] caller is debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.736018][ T2] CPU: 0 UID: 0 PID: 2 Comm: kthreadd Tainted: G T 6.18.0-rc1-00012-gde840681a162 #1 PREEMPT(full) [ 2.736316][ T2] Tainted: [T]=RANDSTRUCT [ 2.736316][ T2] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 2.736316][ T2] Call Trace: [ 2.736316][ T2] dump_stack_lvl (lib/dump_stack.c:122) [ 2.736316][ T2] dump_stack (lib/dump_stack.c:130) [ 2.736316][ T2] check_preemption_disabled+0x98/0xa8 [ 2.736316][ T2] debug_smp_processor_id (lib/smp_processor_id.c:59) [ 2.736316][ T2] set_track_update (mm/slub.c:1035 (discriminator 1)) [ 2.736316][ T2] ___slab_alloc (mm/slub.c:1046 mm/slub.c:4511) [ 2.736316][ T2] ? set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.736316][ T2] __kmalloc_cache_noprof (mm/slub.c:4544 mm/slub.c:4929 mm/slub.c:5455) [ 2.736316][ T2] ? set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.736316][ T2] set_kthread_struct (include/linux/slab.h:957 include/linux/slab.h:1094 kernel/kthread.c:125) [ 2.736316][ T2] copy_process (kernel/fork.c:2110 (discriminator 1)) [ 2.736316][ T2] kernel_clone (include/linux/random.h:26 kernel/fork.c:2610) [ 2.736316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.736316][ T2] kernel_thread (kernel/fork.c:2671) [ 2.736316][ T2] ? kthread_is_per_cpu (kernel/kthread.c:412) [ 2.736316][ T2] kthreadd (kernel/kthread.c:486 kernel/kthread.c:846) [ 2.736316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.736316][ T2] ret_from_fork (arch/x86/kernel/process.c:164) [ 2.736316][ T2] ? kthreads_online_cpu (kernel/kthread.c:818) [ 2.736316][ T2] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 2.736316][ T2] entry_INT80_32 (arch/x86/entry/entry_32.S:942) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251016/202510161416.b7adda58-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki