On Wed, Jul 27, 2011 at 11:35:49AM -0500, Dan Nelson wrote:
> In the last episode (Jul 27), Alexander Best said:
> > hi there,
> >
> > i was trying to attach truss to chromium via
> >
> > 'truss -p 18445' and got:
> >
> > [...]
> > kevent(26,{},0,{0x1b,EVFILT_READ,0x0,0,0x1,0x44cb600 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> > 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x!
> 0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0
> 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,!
> 0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,0x0,0x0,0,0x0,0x0 0x0,!
> 0x0,0x0,
> > -- UNKNOWN SYSCALL -14720592 --
> > write(-14720976,0x8080808080808000,0) = 41 (0x29)
> > select(94,0x6acd,{0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
> > 22 23 24 25 26 27 28 29 30 31 40 41 42 43 44 45 46 70 71 72 73 76 77 78 79
> > 80 81 82 84 87 88 91},0x1,{0.85048848 }) = 73 (0x49)
> > -- UNKNOWN SYSCALL 303120384 --
> > #94(0x0,0x0,0x5e,0xb6cd600,0x83ed780,0x3dae410) = 189 (0xbd)
> > truss: Cannot malloc -14740096 bytes for fd_set array: Cannot allocate
> > memory
>
> Invalid syscalls numbers like that usually mean that truss has attached to a
> process in the middle of a syscall. The ptrace API fires the same event for
> syscall enter and exit, so if truss is expecting an enter and gets an exit,
> you get a mangled syscall number and eventually truss will coredump trying
> to decode incorrect data.
>
> Try applying the patch at https://www.evoy.net/FreeBSD/truss.diff , which
> amongst other things, fixes this problem. If you just want the syscall fix,
> search the diff for "50-50 chance" and manually patch that if(){} block in
> your source.We have PL_FLAG_SCE/PL_FLAG_SCX for some time. I planned to update truss to use the flags, as well as to take advantage of PL_FLAG_FORKED to close the race where truss can miss the forked child. Unfortunately, the project stalled.
pgpl5z6RehkLM.pgp
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