From: Rabin Vincent <rabinv(a)axis.com&gt; If the kernel crashed while running a module's initcall, then the mod->init_size is not zero and in this case crash fails while gathering module symbol data with: crash: store_module_symbols_v2: total: 7 mcnt: 8 This seems to be because store_module_symbols_v2 will add pseudo-symbols for MODULE_INIT_START and MODULE_INIT_END, while the "total" calculation in module_init() doesn't account for this. For reference, a log with -d8: please wait... (gathering module symbol data)module: c00fc5c0 <readmem: c00fc5c0, KVADDR, "module struct", 384, (ROE|Q), 8701800> <readmem: 80540000, KVADDR, "pgd page", 16384, (FOE), a0c3ec8> <read_ramdump: addr: 80540000 paddr: 540000 cnt: 16384> read_ramdump: addr: 80540000 paddr: 540000 cnt: 16384 offset: 540000 <readmem: 72b0000, PHYSADDR, "page table", 16384, (FOE), a0c7ed0> <read_ramdump: addr: 72b0000 paddr: 72b0000 cnt: 16384> read_ramdump: addr: 0 paddr: 72b0000 cnt: 16384 offset: 72b0000 <read_ramdump: addr: c00fc5c0 paddr: 722c5c0 cnt: 384> read_ramdump: addr: c00fc5c0 paddr: 722c5c0 cnt: 384 offset: 722c5c0 FREEBUF(0) GETBUF(384 -> 0) <readmem: c00fc5c0, KVADDR, "module buffer", 384, (FOE), 8701800> <read_ramdump: addr: c00fc5c0 paddr: 722c5c0 cnt: 384> read_ramdump: addr: c00fc5c0 paddr: 722c5c0 cnt: 384 offset: 722c5c0 c00fc5c0 (c00fc000): null_blk syms: 0 gplsyms: 0 ksyms: 5 GETBUF(2031 -> 1) <readmem: c00fc000, KVADDR, "module (kallsyms)", 2031, (ROE|Q), 8704000> <read_ramdump: addr: c00fc000 paddr: 722c000 cnt: 2031> read_ramdump: addr: c00fc000 paddr: 722c000 cnt: 2031 offset: 722c000 GETBUF(4140 -> 2) <readmem: c0104000, KVADDR, "module init (kallsyms)", 4140, (ROE|Q), 870e000> <read_ramdump: addr: c0104000 paddr: 7154000 cnt: 4140> read_ramdump: addr: c0104000 paddr: 7154000 cnt: 4140 offset: 7154000 null_set_queue_mode: st_name: 1 st_value: c00fc000 st_shndx: 2 st_info: t null_set_irqmode: st_name: 21 st_value: c00fc048 st_shndx: 2 st_info: t null_exit: st_name: 38 st_value: c00fc090 st_shndx: 6 st_info: t cleanup_module: st_name: 48 st_value: c00fc090 st_shndx: 6 st_info: t FREEBUF(2) FREEBUF(1) FREEBUF(0) crash: store_module_symbols_v2: total: 7 mcnt: 8 --- kernel.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel.c b/kernel.c index 9019cf5..bdd0d05 100644 --- a/kernel.c +++ b/kernel.c @@ -3475,6 +3475,7 @@ module_init(void) total += nsyms; total += 2; /* store the module's start/ending addresses */ + total += 2; /* and the init start/ending addresses */ /* * If the module has kallsyms, set up to grab them as well. -- 2.1.4