[lvm-devel] clvmd coredump issue
Liuhua Wang
lwang at suse.com
Thu Apr 24 06:58:58 UTC 2014
Hi, list
I have encountered a coredump when start clvmd on ppc64 as followed:
#p $pc
$1 = (void (*)()) 0x10070c18
#bt
#0 0x0000000010070c18 in _allocate_memory () at mm/memlock.c:130
#1 0x0000000010070d38 in _lock_mem (cmd=<optimized out>) at mm/memlock.c:310
#2 _lock_mem_if_needed (cmd=0x10104f40) at mm/memlock.c:387
#3 0x0000000010011358 in init_clvm (excl_uuid=<optimized out>) at
lvm-functions.c:919
#4 0x000000001000f47c in lvm_thread_fn (arg=0xfffcaf4e530) at clvmd.c:2020
#5 0x00000fff9df6c67c in .start_thread () from /lib64/power6/libpthread.so.0
#6 0x00000fff9de7643c in .__clone () from /lib64/power6/libc.so.6
When the followed four lines are commented then the problem is ok.
I suppose the problem is probably because of alloca.
static void _allocate_memory(void)
{
void *stack_mem, *temp_malloc_mem;
struct rlimit limit;
/* Check if we could preallocate requested stack */
- if ((getrlimit (RLIMIT_STACK, &limit) == 0) &&
- ((_size_stack * 2) < limit.rlim_cur) &&
- ((stack_mem = alloca(_size_stack))))
- _touch_memory(stack_mem, _size_stack);
/* FIXME else warn user setting got ignored */
if ((temp_malloc_mem = malloc(_size_malloc_tmp)))
_touch_memory(temp_malloc_mem, _size_malloc_tmp);
if ((_malloc_mem = malloc(_size_malloc)))
_touch_memory(_malloc_mem, _size_malloc);
free(temp_malloc_mem);
}
My questions are:
1. Can we delete the four lines, since it is just PREallocate?
2. What is the purpose of _touch_memory()
3. why do first malloc temp_malloc_mem but then free it?
Any information is very appreciated.
Best regards,
Melody
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