Re: [Libunwind-devel] libunwind backtrace on mips64

[Siddharth Bhojnagarwala]

Here is the output with debug level set to 31.  Any clues?

>_ULmips_init_local: (cursor=0xffff86aad0)
 >_ULmips_step: (cursor=0xffff86aad0)
                >get_rs_cache: get_rs_cache: acquiring lock
              >_ULmips_dwarf_find_proc_info: looking for IP=0x5555785d9f
               >callback: checking , base=0x0)
               >callback: checking /opt/thoroughbred/lib/libgtest.so.0, 
base=0x55555a0000)
               >callback: checking /opt/thoroughbred/lib/libpthread.so.0, 
base=0x5555650000)
               >callback: checking /opt/thoroughbred/lib/librt.so.1, 
base=0x5555680000)
               >callback: checking 
/opt/thoroughbred/lib/libTosUtilsTestProto.so, base=0x55556a0000)
               >callback: checking /opt/thoroughbred/lib/libdl.so.2, 
base=0x55556f0000)
               >callback: checking 
/opt/thoroughbred/lib/libtcmalloc_debug.so.0, base=0x5555710000)
               >callback: found table 
`/opt/thoroughbred/lib/libtcmalloc_debug.so.0': segbase=0x555579ca20, len=593, 
gp=0xa7550, table_data=0x555579ca2c
               >callback: Trying to find .debug_frame
    >locate_debug_info: calculated bounds of 55710000-557e6990 for 
'/opt/thoroughbred/lib/libtcmalloc_debug.so.0'
               >callback: couldn't load .debug_frame
 >lookup: e->start_ip_offset = fffbf300
 >lookup: e->start_ip_offset = fffc904c
 >lookup: e->start_ip_offset = ffff238c
 >lookup: e->start_ip_offset = fffef670
 >lookup: e->start_ip_offset = fffca234
 >lookup: e->start_ip_offset = fffca840
 >lookup: e->start_ip_offset = fffeefe0
 >lookup: e->start_ip_offset = fffcaa50
 >lookup: e->start_ip_offset = fffcaad8
               >_ULmips_dwarf_search_unwind_table: ip=0x5555785d9f, 
start_ip=0xfffffffffffcaad8
 >_ULmips_dwarf_search_unwind_table: e->fde_offset = 18718, segbase = 5579ca20, 
 >debug_frame_base = 0, fde_addr = 557b5138
            >_ULmips_dwarf_extract_proc_info_from_fde: FDE @ 0x55557b5138
               >_ULmips_dwarf_extract_proc_info_from_fde: looking for CIE at 
address 557b50e8
               >parse_cie: CIE parsed OK, augmentation = "zRP", 
handler=0x5555a3cb18
               >_ULmips_dwarf_extract_proc_info_from_fde: FDE covers IP 
0x55557674f8-0x5555767590, LSDA=0x0
                >put_rs_cache: unmasking signals/interrupts and releasing lock
               >_ULmips_dwarf_step: returning -10
 >_ULmips_init_local: (cursor=0xffff862430)
 >_ULmips_step: (cursor=0xffff862430)
                >get_rs_cache: get_rs_cache: acquiring lock
                >put_rs_cache: unmasking signals/interrupts and releasing lock
               >_ULmips_dwarf_step: returning 1
 >_ULmips_step: (cursor=0xffff862430)
                >get_rs_cache: get_rs_cache: acquiring lock
              >_ULmips_dwarf_find_proc_info: looking for IP=0x5555777023
               >callback: checking , base=0x0)
               >callback: checking /opt/thoroughbred/lib/libgtest.so.0, 
base=0x55555a0000)
               >callback: checking /opt/thoroughbred/lib/libpthread.so.0, 
base=0x5555650000)
               >callback: checking /opt/thoroughbred/lib/librt.so.1, 
base=0x5555680000)
               >callback: checking 
/opt/thoroughbred/lib/libTosUtilsTestProto.so, base=0x55556a0000)
               >callback: checking /opt/thoroughbred/lib/libdl.so.2, 
base=0x55556f0000)
               >callback: checking 
/opt/thoroughbred/lib/libtcmalloc_debug.so.0, base=0x5555710000)
               >callback: found table 
`/opt/thoroughbred/lib/libtcmalloc_debug.so.0': segbase=0x555579ca20, len=593, 
gp=0xa7550, table_data=0x555579ca2c
               >callback: Trying to find .debug_frame
    >locate_debug_info: calculated bounds of 55710000-557e6990 for 
'/opt/thoroughbred/lib/libtcmalloc_debug.so.0'
               >callback: couldn't load .debug_frame
 >lookup: e->start_ip_offset = fffbf300
 >lookup: e->start_ip_offset = fffc904c
 >lookup: e->start_ip_offset = ffff238c
 >lookup: e->start_ip_offset = fffef670
 >lookup: e->start_ip_offset = fffca234
 >lookup: e->start_ip_offset = fffca840
 >lookup: e->start_ip_offset = fffeefe0
 >lookup: e->start_ip_offset = fffcaa50
 >lookup: e->start_ip_offset = fffcaad8
               >_ULmips_dwarf_search_unwind_table: ip=0x5555777023, 
start_ip=0xfffffffffffcaad8
 >_ULmips_dwarf_search_unwind_table: e->fde_offset = 18718, segbase = 5579ca20, 
 >debug_frame_base = 0, fde_addr = 557b5138
            >_ULmips_dwarf_extract_proc_info_from_fde: FDE @ 0x55557b5138
               >_ULmips_dwarf_extract_proc_info_from_fde: looking for CIE at 
address 557b50e8
               >parse_cie: CIE parsed OK, augmentation = "zRP", 
handler=0x5555a3cb18
               >_ULmips_dwarf_extract_proc_info_from_fde: FDE covers IP 
0x55557674f8-0x5555767590, LSDA=0x0
                >put_rs_cache: unmasking signals/interrupts and releasing lock
               >_ULmips_dwarf_step: returning -10

Regards,
Sid

-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Arun Sharma
Sent: Wednesday, December 21, 2011 6:48 PM
To: Siddharth Bhojnagarwala
Cc: address@hidden
Subject: Re: [Libunwind-devel] libunwind backtrace on mips64

On Wed, Dec 21, 2011 at 2:56 PM, Siddharth Bhojnagarwala <address@hidden> wrote:
> I am wondering if libunwind is not able to get full backtrace on 
> mips64 all the time?  I mean does use of certain things (line inline 
> functions, function pointers, static functions) break libunwind?  It 
> is only able to get 1 level backtrace.
>

You want to compile libunwind with

configure --enable-debug

and run with UNW_DEBUG_LEVEL=n to figure out what's going wrong.

Examples here:

http://thread.gmane.org/gmane.comp.lib.unwind.devel/520/focus=522

 -Arun