Is there any interest in a talloc extension to gdb-heap

[Uri Simchoni]

I'd be interested!

Thanks,
Uri.

On 02/12/2016 04:06 AM, Richard Sharpe wrote:
> Hi folks,
>
> There is a tool out there called gdb-heap that allows you to scan the heap
> for a process or a core file. It can show you info like:
>
> --------------------------------------
>     80: 0x00007f62e815a610 -> 0x00007f62e815a64f       64 bytes C:string
> data:None:None |2f 68 6f 6d 65 2f 73 61 6d 62 61 2f 6c 6f 63 6b 2f 73 6d 62
> 58 73 72 76 5f 74 63 6f 6e 5f 67 6c 6f 62 61 6c 2e 74 64 62 00 f4 95 e4 62
> 7f 00 00 40 00 00 00 00 00 00 00 31 00 00 00 00 00 00 00
> |/home/samba/lock/smbXsrv_tcon_global.tdb....b^?.. at .......1.......|
>     81: 0x00007f62e815a650 -> 0x00007f62e815a67f       48 bytes
> uncategorized::48 bytes:0x7f62e815a650 |90 c3 cc e6 62 7f 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 b0 51 16 e8 62 7f 00 00 00 65 00 00 00
> 00 00 00 91 00 00 00 00 00 00 00
> |....b^?...................Q..b^?...e..............|
> ---------------------------------------
>
> I have extended it to understand some aspects of talloc. I can now see
> things like:
>
> -----------------------------------------------------------
>   1381: 0x00007f62e81998d0 -> 0x00007f62e81999cf      256 bytes
> talloc:talloc chunk:144 bytes:"struct memcache_element" |d0 a5 1c e8 62 7f
> 00 00 80 3b 17 e8 62 7f 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3a 0d 6b e6 62 7f 00 00
> 90 00 00 00 00 00 00 00 70 0c 15 e8 7f 00 00 01 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 14 00 06 00 ff ff ff ff 50 18 18 e8 62 7f 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0 3b 17 e8 62 7f 00 00
> |....b^?...;..b^?..................................:.k.b^?..........p...^?...........................P...b^?...................;..b^?..|
>   1383: 0x00007f62e8199a00 -> 0x00007f62e819ba8f     8336 bytes talloc:free
> talloc pool:0 bytes:"../source3/smbd/process.c:3525" |c0 b9 19 e8 62 7f 00
> 00 01 00 00 00 62 7f 00 00 00 20 00 00 00 00 00 00 f0 99 19 e8 62 7f 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0 80 18 e8 62 7f 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60 3a
> 3b e6 62 7f 00 00 00 00 00 00 00 00 00 00 77 0c 15 e8 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 20 9a 19 e8 62 7f 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60 3a 3b e6 62 7f
> 00 00 22 00 00 00 00 00 00 00 7b 0c 15 e8 00 00 00 00 00 00 00 00 00 00 00
> 00 00 9a 19 e8 62 7f 00 00 00 00 00 00 00 00 00 00 53 45 43 52 45 54 53 2f
> 4d 41 43 48 49 4e 45 5f 50 41 53 53 57 4f 52 44 2f 56 4e 41 53 44 4f 4d
> |....b^?......b^?...
> ..........b^?......................b^?..........................`:;.b^?..........w...............................................
> ...b^?..........................`:;.b^?..".......{...................b^?..........SECRETS/MACHINE_PASSWORD/VNASDOM|
>     1 talloc objects, end at 0x7f62e819b9c0, poolsize: 8192,
> round_up_pool_size: 8192
> Free object at 0x7f62e8199a80
>     Flags: 0xe8150c7b
>     Size:  34, prefix = 0, used = 144
>     Alloc/Dealloc: "../source3/smbd/process.c:3525"
>   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 9a 19 e8 62 7f 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60
> 3a 3b e6 62 7f 00 00 22 00 00 00 00 00 00 00 7b 0c 15 e8 00 00 00 00 00 00
> 00 00 00 00 00 00 00 9a 19 e8 62 7f 00 00 00 00 00 00 00 00 00 00 53 45 43
> 52 45 54 53 2f 4d 41 43 48 49 4e 45 5f 50 41 53 53 57 4f 52 44 2f 56 4e 41
> 53 44 4f 4d 31 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 |................
> ...b^?..........................`:;.b^?..".......{...................b^?..........SECRETS/MACHINE_PASSWORD/VNASDOM1...............................|
> Free object at 0x7f62e8199b10
>     Flags: 0xe8150c7b
>     Size:  39, prefix = 0, used = 144
>     Alloc/Dealloc: "../source3/smbd/process.c:3525"
>   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 20 9a 19 e8 62 7f 00 00
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60
> 3a 3b e6 62 7f 00 00 27 00 00 00 00 00 00 00 7b 0c 15 e8 00 00 00 00 00 00
> 00 00 00 00 00 00 00 9a 19 e8 62 7f 00 00 00 00 00 00 00 00 00 00 53 45 43
> 52 45 54 53 2f 4d 41 43 48 49 4e 45 5f 50 41 53 53 57 4f 52 44 2e 50 52 45
> 56 2f 56 4e 41 53 44 4f 4d 31 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 00 00 00 00 00 00 00 00 00 00 00 |................
> ...b^?..........................`:;.b^?..'.......{...................b^?..........SECRETS/MACHINE_PASSWORD.PREV/VNASDOM1..........................|
> ------------------------------------------------------------
>
> Is this something that would be interesting to people? Should I fork the
> gdb-heap project in gitlab or gitgud or something like that?
>