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On Mon, 2004-06-21 at 23:13, Martin Schlemmer wrote: > Hi > > We have a sandbox that verify that all writes stay in the sandbox. > BTW, this is GPL, and available if somebody interested. > With cvs 20040619 (and prob earlier?) of glibc the libio/tst_putwc > keeps on segfaulting during 'make check'. Trace follows: > > --- > Program received signal SIGSEGV, Segmentation fault. > 0x4005ec9f in *__GI_putwc (wc=84, fp=0x804b040) at putwc.c:31 > 31 result = _IO_putwc_unlocked (wc, fp); > (gdb) bt > #0 0x4005ec9f in *__GI_putwc (wc=84, fp=0x804b040) at putwc.c:31 > #1 0x08049145 in do_test () > #2 0x0804b040 in ?? () > #3 0x00000001 in ?? () > #4 0x00000000 in ?? () > #5 0x00000001 in ?? () > #6 0xffffffff in ?? () > #7 0x4011385c in __elf_set___libc_thread_subfreeres_element___rpc_thread_destroy__ () > from /space/var/tmp/portage/glibc-2.3.4.20040619/work/build/libc.so.6 > #8 0xbfffda08 in ?? () > #9 0x4011385c in __elf_set___libc_thread_subfreeres_element___rpc_thread_destroy__ () > from /space/var/tmp/portage/glibc-2.3.4.20040619/work/build/libc.so.6 > #10 0x00000000 in ?? () > #11 0x400b3e64 in *__GI___sbrk (increment=-1073751100) at ../sysdeps/generic/sbrk.c:34 > Previous frame inner to this frame (corrupt stack?) > (gdb) > --- > > The whole glibc is compiled with -ggdb, so I assume the 'untraced' calls > is from the libsandbox.so that gets preloaded. Now: > > 1) Anybody seen anything like this before, or can think of anything > that might be related? I guess it might be stack corruption on the > side of libsandbox.so, but it have been working for months unchanged, > and this is pretty much the first of its kind. > > 2) If not 1), is there a way to get gdb to also trace into the > preloaded libsandbox.so? > > NB: Please keep me in CC > > > Thanks, -- Martin Schlemmer
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