This patch fixed it. http://lkml.org/lkml/2005/6/13/204 The ELF core dump code has one use of off_t when writing out segments. Some of the segments may be passed the 2GB limit of an off_t, even on a 32-bit system, so it's important to use loff_t instead. This fixes a corrupted core dump in the bigcore test in GDB's testsuite. Signed-off-by: Daniel Jacobowitz <dan@xxxxxxxxxxxxxxxx> Index: linux-2.6.11/fs/binfmt_elf.c =================================================================== --- linux-2.6.11.orig/fs/binfmt_elf.c 2005-06-09 16:38:17.000000000 -0400 +++ linux-2.6.11/fs/binfmt_elf.c 2005-06-10 00:10:52.000000000 -0400 @@ -1125,7 +1125,7 @@ static int dump_write(struct file *file, return file->f_op->write(file, addr, nr, &file->f_pos) == nr; } -static int dump_seek(struct file *file, off_t off) +static int dump_seek(struct file *file, loff_t off) { if (file->f_op->llseek) { if (file->f_op->llseek(file, off, 0) != off) --- Glynn Clements <glynn@xxxxxxxxxxxxxxxxxx> wrote: > > linux err wrote: > > > > > Does anyone know what determines the size of a > core > > dump? I have a process running out of memory (it > > allocates about 3GB) - but the size of core varies > > (between 2-3GB) depending on how much the process > > wrote on the allocated memory. > > > > Also, the time it takes to write the core (same > size) > > varies?? > > > > I briefly looked at elf_core_dump and > get_user_pages() > > in binfmt_elf.c. Is there any documentation on > this? > > Or anyone knows how it works? > > The relevant function seems to be maydump() (in > binfmt_elf.c); this > determines whether or not a given VM area should be > dumped. > > Essentially, it doesn't dump data which can be > obtained elsewhere, > e.g. from an executable, shared library, unmodified > mmap()d file, etc. > > Primarily, this prevents dumping the .text and > .rodata segments of the > executable and shared libraries, which will often > account for most of > a process' address space. > > -- > Glynn Clements <glynn@xxxxxxxxxxxxxxxxxx> > - > To unsubscribe from this list: send the line > "unsubscribe linux-c-programming" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at > http://vger.kernel.org/majordomo-info.html > ____________________________________________________________________________________ Do you Yahoo!? Everyone is raving about the all-new Yahoo! Mail beta. http://new.mail.yahoo.com - To unsubscribe from this list: send the line "unsubscribe linux-c-programming" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
