Hi Lianbo, Tao Remove offline status check, We can query the registers of each CPU at any time and obtain their stack. CPU 0: [OFFLINE] X0: 0000000000000000 X1: 0000000000000000 X2: 0000000000000000 X3: 000000000003fcbc X4: 0000000000000001 X5: 0000000000000000 X6: 0000000000000000 X7: 0000000000000000 X8: 00000000ffffffff X9: ffffffc009e6ae48 X10: ffffffc009e6ae20 X11: 0000000000000000 X12: 0000000000000002 X13: 0000000000000004 X14: 0000000000000000 X15: 0000000000004000 X16: 00000000f90f05f6 X17: 00000000f90f05f6 X18: 0000000000000000 X19: 0000000000000002 X20: ffffffc009e3b008 X21: ffffffc00a01d020 X22: ffffffc009f798f0 X23: 0000000060001000 X24: 0000000000000000 X25: 0000000000000000 X26: 0000000000000000 X27: 0000000000000000 X28: ffffff8111eecb00 X29: ffffffc008003f50 LR: ffffffc00802df88 SP: ffffffc008003f40 PC: ffffffc00802df94 PSTATE: 024003c5 FPVALID: 00000000 crash> bt -c 0 PID: 1842 TASK: ffffff8111eecb00 CPU: 0 COMMAND: "android.bg" 00 [ffffffc008003f50] ipi_handler at ffffffc00802df90 01 [ffffffc008003f90] handle_percpu_devid_irq at ffffffc008146f50 02 [ffffffc008003fd0] generic_handle_domain_irq at ffffffc00813f484 03 [ffffffc008003fe0] gic_handle_irq at ffffffc008010140 --- <IRQ stack> --- 04 [ffffffc019c3be20] call_on_irq_stack at ffffffc008016ed4 05 [ffffffc019c3be40] do_interrupt_handler at ffffffc008019cb4 06 [ffffffc019c3be60] el0_interrupt at ffffffc008f7b848 07 [ffffffc019c3be90] __el0_irq_handler_common at ffffffc008f7b368 08 [ffffffc019c3bea0] el0t_64_irq_handler at ffffffc008f7b344 09 [ffffffc019c3bfe0] el0t_64_irq at ffffffc008011720 PC: 0000000072415108 LR: 00000000724150d0 SP: 0000007691d2bfa0 X29: 00000000734f60e0 X28: 000000001a2fa678 X27: 0000000000000063 X26: 000000001a2fa678 X25: 000000001a2fa678 X24: 000000001a7bb718 X23: 000000001a7ba198 X22: 000000001a7ba190 X21: b4000076f9a828c8 X20: 0000000000000000 X19: b4000076f9a82800 X18: 000000768d68a000 X17: 00000000708f89f8 X16: 00000000000000f0 X15: 0000000000000000 X14: 0000007691d2bca0 X13: 0000000080100000 X12: 0000000000000000 X11: 0000000000000000 X10: 0000000000000000 X9: 9636716211228cd4 X8: 9636716211228cd4 X7: 0000000000000010 X6: 000000001a7bb728 X5: 0000000070845200 X4: 0000000018a40d38 X3: 00000000707e8f98 X2: 000000001a2fa678 X1: 000000001a7ba198 X0: 0000000070847aa8 ORIG_X0: 00000000ffffff9c SYSCALLNO: ffffffff PSTATE: 60001000 Signed-off-by: Guanyou.Chen <chenguanyou(a)xiaomi.com&gt; --- netdump.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-) diff --git a/netdump.c b/netdump.c index 435793b..455f90e 100644 --- a/netdump.c +++ b/netdump.c @@ -101,7 +101,7 @@ map_cpus_to_prstatus(void) nrcpus = (kt->kernel_NR_CPUS ? kt->kernel_NR_CPUS : NR_CPUS); for (i = 0; i < nrcpus; i++) { - if (in_cpu_map(ONLINE_MAP, i) && machdep->is_cpu_prstatus_valid(i)) { + if (machdep->is_cpu_prstatus_valid(i)) { nd->nt_prstatus_percpu[i] = nt_ptr[i]; nd->num_prstatus_notes = MAX(nd->num_prstatus_notes, i+1); @@ -2998,15 +2998,10 @@ dump_registers_for_elf_dumpfiles(void) return; } - for (c = 0; c < kt->cpus; c++) { - if (check_offline_cpu(c)) { - fprintf(fp, "%sCPU %d: [OFFLINE]\n", c ? "\n" : "", c); - continue; - } - - fprintf(fp, "%sCPU %d:\n", c ? "\n" : "", c); - display_regs_from_elf_notes(c, fp); - } + for (c = 0; c < kt->cpus; c++) { + fprintf(fp, "%sCPU %d: %s\n", c ? "\n" : "", c, check_offline_cpu(c) ? "[OFFLINE]" : "[ONLINE]"); + display_regs_from_elf_notes(c, fp); + } } struct x86_64_user_regs_struct { -- 2.34.1 Guanyou. Thanks.