[Crash-utility] unwind not working on x86?

[Jan Willeke]

Hello

I am trying to use both the unwind function on x86 in crash, and the fp
extension. Both are not working for me.

I did the following tests: (crash 7.0.9)

crash/crash vmcore.201412161409 linux-3.2.64/vmlinux

GNU gdb (GDB) 7.6

      KERNEL: linux-3.2.64/vmlinux
    DUMPFILE: vmcore.201412161409
        CPUS: 1
        DATE: Tue Dec 16 15:09:46 2014
      UPTIME: 00:00:46
LOAD AVERAGE: 0.05, 0.01, 0.01
       TASKS: 55
    NODENAME: debian
     RELEASE: 3.2.64
     VERSION: #2 SMP Tue Dec 16 15:08:10 CET 2014
     MACHINE: x86_64  (2392 Mhz)
      MEMORY: 383.5 MB
       PANIC: "[   46.736164] Oops: 0002 [#1] SMP " (check log for details)
         PID: 1962
     COMMAND: "tee"
        TASK: ffff88000e5e0000  [THREAD_INFO: ffff88000c8e8000]
         CPU: 0
       STATE: TASK_RUNNING (PANIC)

crash> bt
PID: 1962   TASK: ffff88000e5e0000  CPU: 0   COMMAND: "tee"
 #0 [ffff88000c8e99f0] machine_kexec at ffffffff81038e0a
 #1 [ffff88000c8e9a60] crash_kexec at ffffffff810b3a92
 #2 [ffff88000c8e9b30] oops_end at ffffffff816427e8
 #3 [ffff88000c8e9b60] no_context at ffffffff81635d6f
 #4 [ffff88000c8e9bc0] __bad_area_nosemaphore at ffffffff81635f49
 #5 [ffff88000c8e9c20] bad_area at ffffffff81635fc2
 #6 [ffff88000c8e9c50] do_page_fault at ffffffff81645454
 #7 [ffff88000c8e9d60] do_async_page_fault at ffffffff81644b75
 #8 [ffff88000c8e9d80] async_page_fault at ffffffff81641de5
    [exception RIP: sysrq_handle_crash+22]
    RIP: ffffffff813cad46  RSP: ffff88000c8e9e38  RFLAGS: 00010092
    RAX: 0000000000000010  RBX: 0000000000000063  RCX: 00000000ffffffff
    RDX: 0000000000000000  RSI: 0000000000000082  RDI: 0000000000000063
    RBP: ffff88000c8e9e38   R8: 0000000000000000   R9: 0000000000000000
    R10: 0000000000000000  R11: 0000000000000000  R12: ffffffff81c725e0
    R13: 0000000000000286  R14: 0000000000000007  R15: 0000000000000000
    ORIG_RAX: ffffffffffffffff  CS: 0010  SS: 0018
 #9 [ffff88000c8e9e40] __handle_sysrq at ffffffff813cb461
#10 [ffff88000c8e9e80] write_sysrq_trigger at ffffffff813cb51a
#11 [ffff88000c8e9eb0] proc_reg_write at ffffffff811d60e2
#12 [ffff88000c8e9f00] vfs_write at ffffffff81176053
#13 [ffff88000c8e9f30] sys_write at ffffffff8117637a
#14 [ffff88000c8e9f80] sysenter_dispatch at ffffffff8164bc70
    RIP: 00000000f775e430  RSP: 00000000ffe6a720  RFLAGS: 00000296
    RAX: 0000000000000004  RBX: ffffffff8164bc70  RCX: 00000000ffe6a81c
    RDX: 0000000000000002  RSI: 0000000000000002  RDI: 00000000ffe6a81c
    RBP: 00000000ffe6a758   R8: 0000000000000000   R9: 0000000000000000
    R10: 0000000000000000  R11: 0000000000000000  R12: 0000000000000000
    R13: 0000000000000000  R14: 0000000000000003  R15: 0000000000000000
    ORIG_RAX: 0000000000000004  CS: 0023  SS: 002b

crash> set unwind on
unwind: on

crash> bt
PID: 1962   TASK: ffff88000e5e0000  CPU: 0   COMMAND: "tee"
 #0 [ffff88000c8e99f0] machine_kexec at ffffffff81038e0a
    RIP: 00000000f775e430  RSP: 00000000ffe6a720  RFLAGS: 00000296
    RAX: 0000000000000004  RBX: ffffffff8164bc70  RCX: 00000000ffe6a81c
    RDX: 0000000000000002  RSI: 0000000000000002  RDI: 00000000ffe6a81c
    RBP: 00000000ffe6a758   R8: 0000000000000000   R9: 0000000000000000
    R10: 0000000000000000  R11: 0000000000000000  R12: 0000000000000000
    R13: 0000000000000000  R14: 0000000000000003  R15: 0000000000000000
    ORIG_RAX: 0000000000000004  CS: 0023  SS: 002b
crash>

-> no functions no parameters

-------------------------------------------------------------------------------------------------------------

crash> extend crash/extensions/fp.so
./crash/extensions/fp.so: shared object loaded
crash> fp
.................

-> no functions no parameters

Did I anything wrong?

Best Regards,
Jan Willeke