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Linux kernel crash utility
https://crash-utility.github.io
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Is there any way I can set the registers manually? #166

Open lzr1264823628 opened 9 months ago

lzr1264823628 commented 9 months ago

crash 8.0.4++ Is there any way I can set the registers manually? I want to use gdb to look at the local variables in the stack (although it can be manually restored but this is too cumbersome), gdb says I need a pc register, and I failed to manually set the cpu register using gdb.

crash> i r
x0             <unavailable>
x1             <unavailable>
x2             <unavailable>
x3             <unavailable>
x4             <unavailable>
x5             <unavailable>
x6             <unavailable>
x7             <unavailable>
x8             <unavailable>
x9             <unavailable>
x10            <unavailable>
x11            <unavailable>
x12            <unavailable>
x13            <unavailable>
x14            <unavailable>
x15            <unavailable>
x16            <unavailable>
x17            <unavailable>
x18            <unavailable>
x19            <unavailable>
x20            <unavailable>
x21            <unavailable>
x22            <unavailable>
x23            <unavailable>
x24            <unavailable>
x25            <unavailable>
x26            <unavailable>
x27            <unavailable>
x28            <unavailable>
crash> i locals
PC unavailable, cannot determine locals.
crash> i local
PC unavailable, cannot determine locals.
crash> gdb set $pc=0
gdb: gdb request failed: set $pc=0
crash> runq -m
 CPU 0: [1 05:16:52.896]  PID: 0      TASK: ffffffda0558bf80  COMMAND: "swapper/0"
 CPU 1: [0 00:00:00.000]  PID: 2512   TASK: ffffff805ddbca00  COMMAND: "gadget@1.1-serv"
 CPU 2: [0 00:00:00.000]  PID: 23863  TASK: ffffff88402ddc80  COMMAND: "clientSocketRec"
 CPU 3: [1 05:16:52.899]  PID: 0      TASK: ffffff8020489280  COMMAND: "swapper/3"
 CPU 4: [1 05:16:52.898]  PID: 0      TASK: ffffff8020488000  COMMAND: "swapper/4"
 CPU 5: [1 05:16:52.896]  PID: 0      TASK: ffffff802048a500  COMMAND: "swapper/5"
 CPU 6: [1 05:16:52.895]  PID: 0      TASK: ffffff802048b780  COMMAND: "swapper/6"
 CPU 7: [1 05:16:52.863]  PID: 0      TASK: ffffff80204d4a00  COMMAND: "swapper/7"
crash> bt
PID: 2512     TASK: ffffff805ddbca00  CPU: 1    COMMAND: "gadget@1.1-serv"
bt: WARNING: cannot determine starting stack frame for task ffffff805ddbca00
crash> bt -S ffffffc0171ab9f8
PID: 2512     TASK: ffffff805ddbca00  CPU: 1    COMMAND: "gadget@1.1-serv"
bt: WARNING: cannot determine starting stack frame for task ffffff805ddbca00
 #0 [ffffffc0171aba50] usb_gadget_giveback_request at ffffffda03ce8bd4
 #1 [ffffffc0171abaa0] dwc3_remove_requests at ffffffda03c667b4
 #2 [ffffffc0171abb20] dwc3_ep0_out_start at ffffffda03c7269c
 #3 [ffffffc0171abb70] __dwc3_gadget_start at ffffffda03c708e8
 #4 [ffffffc0171abba0] __typeid__ZTSFvvE_global_addr at ffffffda046388b4
 #5 [ffffffc0171abbf0] __typeid__ZTSFvvE_global_addr at ffffffda046388b4
 #6 [ffffffc0171abc30] udc_bind_to_driver at ffffffda03ce7f80
 #7 [ffffffc0171abc60] usb_gadget_probe_driver at ffffffda03ce8854
 #8 [ffffffc0171abc90] gadget_dev_desc_UDC_store at ffffffda03ce54b8
 #9 [ffffffc0171abcd0] configfs_write_file at ffffffda0348bcdc
#10 [ffffffc0171abda0] vfs_write at ffffffda033446b4
#11 [ffffffc0171abdf0] ksys_write at ffffffda03344540
#12 [ffffffc0171abe30] __arm64_sys_write at ffffffda033444b4
#13 [ffffffc0171abe50] el0_svc_common at ffffffda02e93c50
#14 [ffffffc0171abe90] el0_svc at ffffffda045633b8
#15 [ffffffc0171abea0] el0_sync_handler at ffffffda0456332c
#16 [ffffffc0171abfe0] el0_sync at ffffffda02e120b0
     PC: 000000731a54398c   LR: 00000073216d28b0   SP: 0000007fe961cf80
    X29: 0000007fe961cf80  X28: 0000007321aa0010  X27: 0000007fe961d170
    X26: 0000000000000200  X25: 0000000000000000  X24: 0000007fe961d171
    X23: 0000007321aa0010  X22: 0000000000000009  X21: 0000007fe961d079
    X20: 0000000000000009  X19: 000000000000000c  X18: 00000073222bc000
    X17: 000000731a543980  X16: 000000731a567ef0  X15: 000000731a4c37a2
    X14: 0000000000000000  X13: 0000007fe961cf30  X12: ffffff80ffffffd0
    X11: 0000007fe961cf00  X10: 000000000000000c   X9: 0000000000000000
     X8: 0000000000000040   X7: 65676461675f6273   X6: b40000704a4aaad9
     X5: 0000000000008000   X4: ffffffffffffffff   X3: ffffffffffffffff
     X2: 000000000000000c   X1: 0000007fe961d079   X0: 0000000000000009
    ORIG_X0: 0000000000000009  SYSCALLNO: 40  PSTATE: 00001000
crash> help -m
               flags: 104036d1 (KSYMS_START|VM_L3_4K|VMEMMAP|IRQ_STACKS|UNW_4_14|MACHDEP_BT_TEXT|NEW_VMEMMAP|FLIPPED_VM|ARM64_MTE)
              kvbase: ffffff8000000000
   identity_map_base: ffffff8000000000
            pagesize: 4096
           pageshift: 12
            pagemask: fffffffffffff000
          pageoffset: fff
           stacksize: 16384
                  hz: 250
                 mhz: 0
             memsize: 12717129728 (0x2f6000000)
                bits: 64
             nr_irqs: 426
       eframe_search: arm64_eframe_search()
          back_trace: arm64_back_trace_cmd() (default: original method)
  in_alternate_stack: arm64_in_alternate_stack()
     processor_speed: arm64_processor_speed()
               uvtop: arm64_uvtop()->arm64_vtop_3level_4k()
               kvtop: arm64_kvtop()->arm64_vtop_3level_4k()
        get_task_pgd: arm64_get_task_pgd()
            dump_irq: generic_dump_irq()
     get_stack_frame: arm64_get_stack_frame()
       get_stackbase: generic_get_stackbase()
        get_stacktop: generic_get_stacktop()
       translate_pte: arm64_translate_pte()
         memory_size: generic_memory_size()
       vmalloc_start: arm64_vmalloc_start()
   get_kvaddr_ranges: arm64_get_kvaddr_ranges()
        is_task_addr: arm64_is_task_addr()
       verify_symbol: arm64_verify_symbol()
          dis_filter: arm64_dis_filter()
            cmd_mach: arm64_cmd_mach()
        get_smp_cpus: arm64_get_smp_cpus()
           is_kvaddr: arm64_is_kvaddr()
           is_uvaddr: arm64_is_uvaddr()
     value_to_symbol: generic_machdep_value_to_symbol()
     init_kernel_pgd: arm64_init_kernel_pgd
        verify_paddr: generic_verify_paddr()
     show_interrupts: generic_show_interrupts()
    get_irq_affinity: generic_get_irq_affinity()
       dumpfile_init: (not used)
   process_elf_notes: process_elf64_notes()
  verify_line_number: (not used)
  xendump_p2m_create: (n/a)
xen_kdump_p2m_create: (n/a)
  xendump_panic_task: (n/a)
    get_xendump_regs: (n/a)
   line_number_hooks: (not used)
       last_pgd_read: ffffffda05265000
       last_pud_read: (not used)
       last_pmd_read: ffffff806d9a6000
      last_ptbl_read: ffffff80510b3000
 clear_machdep_cache: arm64_clear_machdep_cache()
                 pgd: 55d8f20bc9a0
                 pud: 0
                 pmd: 55d8f20bd9b0
                ptbl: 55d8f20be9c0
        ptrs_per_pgd: 512
   section_size_bits: 30
    max_physmem_bits: 48
   sections_per_root: 128
     cmdline_args[0]: vabits_actual=39
     cmdline_args[1]: (unused)
     cmdline_args[2]: (unused)
     cmdline_args[3]: (unused)
     cmdline_args[4]: (unused)
            machspec: 55d8ef3baea0
      struct_page_size: 0
               VA_BITS: 39
  CONFIG_ARM64_VA_BITS: 39
              VA_START: ffffffc000000000
        VA_BITS_ACTUAL: 39
CONFIG_ARM64_KERNELPACMASK: (unused)
         userspace_top: 0000008000000000
           page_offset: ffffff8000000000
    vmalloc_start_addr: ffffffc008000000
           vmalloc_end: fffffffebffeffff
         modules_vaddr: ffffffc000000000
           modules_end: ffffffc007ffffff
         vmemmap_vaddr: fffffffeffe00000
           vmemmap_end: ffffffffffffffff
           kimage_text: ffffffda02e00000
            kimage_end: ffffffda05870000
        kimage_voffset: ffffffd95ae00000
           phys_offset: 80000000
       physvirt_offset: 8080000000
__exception_text_start: 0
  __exception_text_end: 0
 __irqentry_text_start: ffffffda02e10000
   __irqentry_text_end: ffffffda02e10000
      exp_entry1_start: 0
        exp_entry1_end: 0
      exp_entry2_start: 0
        exp_entry2_end: 0
       panic_task_regs: 0
    user_eframe_offset: 336
    kern_eframe_offset: 320
         PTE_PROT_NONE: 400000000000000
              PTE_FILE: (unused)
       __SWP_TYPE_BITS: 6
      __SWP_TYPE_SHIFT: 2
       __SWP_TYPE_MASK: 3f
     __SWP_OFFSET_BITS: 50
    __SWP_OFFSET_SHIFT: 8
     __SWP_OFFSET_MASK: 3ffffffffffff
   machine_kexec_start: 0
     machine_kexec_end: 0
     crash_kexec_start: 0
       crash_kexec_end: 0
  crash_save_cpu_start: 0
    crash_save_cpu_end: 0
          kernel_flags: a
          irq_stackbuf: 0
        irq_stack_size: 16384
         irq_stacks[0]: ffffffc008000000
         irq_stacks[1]: ffffffc008008000
         irq_stacks[2]: ffffffc008010000
         irq_stacks[3]: ffffffc008018000
         irq_stacks[4]: ffffffc008020000
         irq_stacks[5]: ffffffc008028000
         irq_stacks[6]: ffffffc008030000
         irq_stacks[7]: ffffffc008038000