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To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-hackers@freebsd.org, hackers@freebsd.org
Subject: Re: Is there any modern alternative to pstack?
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On 04/02/2012 05:31, John Baldwin wrote:
> Hmm, I don't know if the port has it, but I did some work on pstack a while
> ago to make it work with libthread_db so it at least handles i386 ok.  It
> needs to be modified to use something like libunwind though or some other
> unwinder.  And possibly it should use libelf instead of its own ELF-parsing
> code.

I see pstack -1.2_1 failing even on i386:

pstack: cannot read context for thread 0x1879f
pstack: failed to read more threads
1947: /usr/local/share/chromium/chrome
----------------- thread 100255 -----------------
  0x1879f ???????? ()

----------------- thread -1 (running) -----------------
  0x389f1df9 __sys_recvmsg (3, bfbfcd44, 0, bfbfcd68, 0, c) + 5
  0x97850b4 _init (3, bfbfcdc8, 800, bfbfdc20, bfbfdc4c, bfbfdc40) + 15c7c1c
  0xa8089d0 _init (bfbfe074, 3, 0, bfbfe0c4, 20, bfbfdca0) + 264b538
  0xa8094d7 _init (bfbfe44c, 0, bfbfe108, 37a85517, 37aa7680, 38fbf400) 
+ 264c03f
  0x8e7ec02 _init (bfbfe44c, bfbfe4a0, 3c, 0, 0, 0) + cc176a
  0x8e7f102 _init (bfbfe468, bfbfe44c, bfbfe4a0, 37a9f4b4, 37aa5d40, 1) 
+ cc1c6a
  0x8e7f471 _init (2, bfbfe540, bfbfe4a0, 88f9c28, bd4dce8, bd4de88) + 
cc1fd9
  0x81c64ab _init (2, bfbfe540, bfbfe4e8, af61795, bfbfe500, bfbfe540) + 
9013
  0x81c6452 _init (0, 0, bfbfe518, 81c63a7, 2, bfbfe540) + 8fba
  0x81c63a7 _init (3791afd0, 2, bfbfe540, 0, 0, 0) + 8f0f
  0x81c6318 _init (bfbfe6d0, bfbfe6f1, 0, bfbfe6ff, bfbfe762, bfbfe7b8) 
+ 8e80


Yuri