[Bug 6422] grep and segfault

[bugzilla at busybox.net]

https://bugs.busybox.net/show_bug.cgi?id=6422

--- Comment #8 from Denys Vlasenko <vda.linux at googlemail.com> 2013-08-21 06:07:09 UTC ---
(In reply to comment #7)
> > > it is sigsegv, because after last line read(6,  <unfinished ...> strace prints
> > > "killed by SISEGV", sorry, i didn't copy it earlier
> > 
> > This isn't how SIGSEGV is shown in strace output. It should look like this:
> > 
> > ...
> > last_syscall(args)    = result
> > --- SIGSEGV {si_signo=SIGSEGV, si_code=SI_USER, si_pid=22713, si_uid=0} ---
> > +++ killed by SIGSEGV +++
> 
> Ok:
> ...
> lstat64("./proc/stclkrv_core", {st_mode=S_IFDIR|0555, st_size=0, ...}) = 0
> open("./proc/stclkrv_core",
> O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|0x80000) = 5
> getdents64(0x5, 0x5b3240, 0x8000, 0x800000) = 136
> lstat64("./proc/stclkrv_core/odf", {st_mode=S_IFREG|0444, st_size=37, ...}) = 0
> open("./proc/stclkrv_core/odf", O_RDONLY|O_LARGEFILE) = 6
> fstat64(6, {st_mode=S_IFREG|0444, st_size=37, ...}) = 0
> old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x29558000
> read(6,  <unfinished ...>
> +++ killed by SIGSEGV +++
> 
> So.. it means that there is bug in strace?:)

I doubt that the above is a valid strace output. SEGV can't kill processes
*inside* syscalls. I know: I am one of strace developers.

Does "cat </proc/stclkrv_core/odf >/dev/null" work?

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