Re: [PATCH v2 12/12] x86/mm: Enable preemption during flush_tlb_kernel_range

Hello,

kernel test robot noticed "BUG:using_smp_processor_id()in_preemptible" on:

commit: 71316421085260ada767336b7d506cf68cd54501 ("[PATCH v2 12/12] x86/mm: Enable preemption during flush_tlb_kernel_range")
url: https://github.com/intel-lab-lkp/linux/commits/Chuyi-Zhou/smp-Disable-preemption-explicitly-in-__csd_lock_wait/20260302-155954
base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 07fff0001f755de9063652eb09f9c46a108fd7e2
patch link: https://lore.kernel.org/all/[email protected]/
patch subject: [PATCH v2 12/12] x86/mm: Enable preemption during flush_tlb_kernel_range

in testcase: boot

config: i386-randconfig-012-20250528
compiler: gcc-14
test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G

(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]



[    0.311796][    T1] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1
[    0.312917][    T1] caller is debug_smp_processor_id (lib/smp_processor_id.c:59)
[    0.313674][    T1] CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Tainted: G                T   7.0.0-rc1-00532-g713164210852 #1 PREEMPT(full)
[    0.313680][    T1] Tainted: [T]=RANDSTRUCT
[    0.313682][    T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    0.313684][    T1] Call Trace:
[    0.313686][    T1]  ? show_stack (arch/x86/kernel/dumpstack.c:338)
[    0.313701][    T1]  dump_stack_lvl (lib/dump_stack.c:122)
[    0.313715][    T1]  dump_stack (lib/dump_stack.c:130)
[    0.313723][    T1]  check_preemption_disabled (lib/smp_processor_id.c:47)
[    0.313737][    T1]  debug_smp_processor_id (lib/smp_processor_id.c:59)
[    0.313743][    T1]  flush_tlb_kernel_range (arch/x86/mm/tlb.c:1528)
[    0.313764][    T1]  cpa_flush (arch/x86/mm/pat/set_memory.c:455)
[    0.313774][    T1]  change_page_attr_set_clr (arch/x86/mm/pat/set_memory.c:2054)
[    0.313802][    T1]  set_memory_ro (arch/x86/mm/pat/set_memory.c:2305)
[    0.313815][    T1]  bpf_prog_select_runtime (kernel/bpf/core.c:2560 (discriminator 1))
[    0.313829][    T1]  bpf_prepare_filter (net/core/filter.c:1323 net/core/filter.c:1371)
[    0.313847][    T1]  bpf_prog_create (net/core/filter.c:1412 (discriminator 1))
[    0.313858][    T1]  ptp_classifier_init (net/core/ptp_classifier.c:227 (discriminator 2))
[    0.313863][    T1]  ? find_next_fd (include/linux/find.h:192 fs/file.c:564)
[    0.313871][    T1]  sock_init (net/socket.c:3314)
[    0.313882][    T1]  ? sock_alloc_inode (net/socket.c:347)
[    0.313888][    T1]  ? damon_sample_wsse_init (net/socket.c:3268)
[    0.313895][    T1]  do_one_initcall (init/main.c:1382)
[    0.313904][    T1]  ? parse_args (kernel/params.c:130 (discriminator 2) kernel/params.c:186 (discriminator 2))
[    0.313923][    T1]  ? debug_smp_processor_id (lib/smp_processor_id.c:59)
[    0.313930][    T1]  ? rcu_is_watching (include/linux/context_tracking.h:128 kernel/rcu/tree.c:752)
[    0.313948][    T1]  do_initcalls (init/main.c:1443 (discriminator 3) init/main.c:1460 (discriminator 3))
[    0.313964][    T1]  kernel_init_freeable (init/main.c:1694)
[    0.313969][    T1]  ? rest_init (init/main.c:1574)
[    0.313973][    T1]  kernel_init (init/main.c:1584)
[    0.313978][    T1]  ret_from_fork (arch/x86/kernel/process.c:164)
[    0.313982][    T1]  ? rest_init (init/main.c:1574)
[    0.313989][    T1]  ret_from_fork_asm (arch/x86/entry/entry_32.S:737)
[    0.313996][    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/20260310/[email protected]



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