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SubjectRe: Early boot panic on machine with lots of memory
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On Mon, 2012-06-18 at 15:32 -0700, Tejun Heo wrote:
> * Can you please post disassembly of the whole function? It seems
> like rsv->regions[] was corrupt. I want to verify other registers
> too.

Here it is, with the patch you've asked to be tested applied if it matters any:

0000000000000000 <__next_free_mem_range>:
* in lockstep and returns each intersection.
*/
void __init_memblock __next_free_mem_range(u64 *idx, int nid,
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 41 57 push %r15
6: 41 56 push %r14
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
struct memblock_region *r = &rsv->regions[ri];
8: 45 31 f6 xor %r14d,%r14d
* in lockstep and returns each intersection.
*/
void __init_memblock __next_free_mem_range(u64 *idx, int nid,
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
b: 41 55 push %r13
d: 41 54 push %r12
f: 53 push %rbx
10: 48 83 ec 38 sub $0x38,%rsp
14: 48 89 55 b0 mov %rdx,-0x50(%rbp)
18: 48 89 4d a8 mov %rcx,-0x58(%rbp)
1c: 48 89 7d b8 mov %rdi,-0x48(%rbp)
20: 4c 89 45 a0 mov %r8,-0x60(%rbp)
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
int ri = *idx >> 32;

for ( ; mi < mem->cnt; mi++) {
24: 48 8b 0d 00 00 00 00 mov 0x0(%rip),%rcx # 2b <__next_free_mem_range+0x2b>
27: R_X86_64_PC32 memblock+0x4
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
2b: 48 8b 07 mov (%rdi),%rax
/* only memory regions are associated with nodes, check it */
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
2e: 4c 8b 1d 00 00 00 00 mov 0x0(%rip),%r11 # 35 <__next_free_mem_range+0x35>
31: R_X86_64_PC32 memblock+0x24
phys_addr_t *out_end, int *out_nid)
{
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
int ri = *idx >> 32;
35: 48 89 c2 mov %rax,%rdx
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
38: 48 89 45 d0 mov %rax,-0x30(%rbp)
int ri = *idx >> 32;
3c: 48 c1 ea 20 shr $0x20,%rdx

for ( ; mi < mem->cnt; mi++) {
struct memblock_region *m = &mem->regions[mi];
40: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 47 <__next_free_mem_range+0x47>
43: R_X86_64_PC32 memblock+0x1c
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
int ri = *idx >> 32;

for ( ; mi < mem->cnt; mi++) {
47: 48 89 4d c8 mov %rcx,-0x38(%rbp)
struct memblock_region *m = &mem->regions[mi];
4b: 48 89 45 c0 mov %rax,-0x40(%rbp)
/* only memory regions are associated with nodes, check it */
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
4f: 49 8d 5b 01 lea 0x1(%r11),%rbx
struct memblock_region *r = &rsv->regions[ri];
53: 4c 8b 25 00 00 00 00 mov 0x0(%rip),%r12 # 5a <__next_free_mem_range+0x5a>
56: R_X86_64_PC32 memblock+0x3c
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
int ri = *idx >> 32;

for ( ; mi < mem->cnt; mi++) {
5a: e9 c8 00 00 00 jmpq 127 <__next_free_mem_range+0x127>
struct memblock_region *m = &mem->regions[mi];
5f: 4d 6b ed 18 imul $0x18,%r13,%r13
63: 4c 03 6d c0 add -0x40(%rbp),%r13
phys_addr_t m_start = m->base;
67: 4d 8b 4d 00 mov 0x0(%r13),%r9
phys_addr_t m_end = m->base + m->size;
6b: 4d 89 ca mov %r9,%r10
6e: 4d 03 55 08 add 0x8(%r13),%r10

/* only memory regions are associated with nodes, check it */
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
72: 81 fe 00 04 00 00 cmp $0x400,%esi
78: 0f 84 9a 00 00 00 je 118 <__next_free_mem_range+0x118>
r->nid = nid;
}

static inline int memblock_get_region_node(const struct memblock_region *r)
{
return r->nid;
7e: 41 3b 75 10 cmp 0x10(%r13),%esi
82: 0f 85 9c 00 00 00 jne 124 <__next_free_mem_range+0x124>
88: e9 8b 00 00 00 jmpq 118 <__next_free_mem_range+0x118>
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
struct memblock_region *r = &rsv->regions[ri];
8d: 4c 6b c0 18 imul $0x18,%rax,%r8
phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
91: 31 c9 xor %ecx,%ecx
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
struct memblock_region *r = &rsv->regions[ri];
93: 4f 8d 04 04 lea (%r12,%r8,1),%r8
phys_addr_t r_start = ri ? r[-1].base + r[-1].size : 0;
97: 85 d2 test %edx,%edx
99: 74 08 je a3 <__next_free_mem_range+0xa3>
9b: 49 8b 48 f0 mov -0x10(%r8),%rcx
9f: 49 03 48 e8 add -0x18(%r8),%rcx
phys_addr_t r_end = ri < rsv->cnt ? r->base : ULLONG_MAX;
a3: 48 83 cf ff or $0xffffffffffffffff,%rdi
a7: 4c 39 d8 cmp %r11,%rax
aa: 73 03 jae af <__next_free_mem_range+0xaf>
ac: 49 8b 38 mov (%r8),%rdi

/* if ri advanced past mi, break out to advance mi */
if (r_start >= m_end)
af: 4c 39 d1 cmp %r10,%rcx
b2: 73 70 jae 124 <__next_free_mem_range+0x124>
break;
/* if the two regions intersect, we're done */
if (m_start < r_end) {
b4: 4c 39 cf cmp %r9,%rdi
b7: 76 5d jbe 116 <__next_free_mem_range+0x116>
if (out_start)
b9: 48 83 7d b0 00 cmpq $0x0,-0x50(%rbp)
be: 74 0e je ce <__next_free_mem_range+0xce>
*out_start = max(m_start, r_start);
c0: 4c 39 c9 cmp %r9,%rcx
c3: 48 8b 45 b0 mov -0x50(%rbp),%rax
c7: 49 0f 42 c9 cmovb %r9,%rcx
cb: 48 89 08 mov %rcx,(%rax)
if (out_end)
ce: 48 83 7d a8 00 cmpq $0x0,-0x58(%rbp)
d3: 74 11 je e6 <__next_free_mem_range+0xe6>
*out_end = min(m_end, r_end);
d5: 4c 39 d7 cmp %r10,%rdi
d8: 4c 89 d0 mov %r10,%rax
db: 48 8b 4d a8 mov -0x58(%rbp),%rcx
df: 48 0f 46 c7 cmovbe %rdi,%rax
e3: 48 89 01 mov %rax,(%rcx)
if (out_nid)
e6: 48 83 7d a0 00 cmpq $0x0,-0x60(%rbp)
eb: 74 0a je f7 <__next_free_mem_range+0xf7>
*out_nid = memblock_get_region_node(m);
ed: 41 8b 45 10 mov 0x10(%r13),%eax
f1: 48 8b 4d a0 mov -0x60(%rbp),%rcx
f5: 89 01 mov %eax,(%rcx)
/*
* The region which ends first is advanced
* for the next iteration.
*/
if (m_end <= r_end)
f7: 4c 39 d7 cmp %r10,%rdi
fa: 72 05 jb 101 <__next_free_mem_range+0x101>
mi++;
fc: 41 ff c7 inc %r15d
ff: eb 02 jmp 103 <__next_free_mem_range+0x103>
else
ri++;
101: ff c2 inc %edx
*idx = (u32)mi | (u64)ri << 32;
103: 48 c1 e2 20 shl $0x20,%rdx
107: 45 89 ff mov %r15d,%r15d
10a: 48 8b 45 b8 mov -0x48(%rbp),%rax
10e: 4c 09 fa or %r15,%rdx
111: 48 89 10 mov %rdx,(%rax)
return;
114: eb 30 jmp 146 <__next_free_mem_range+0x146>
/* only memory regions are associated with nodes, check it */
if (nid != MAX_NUMNODES && nid != memblock_get_region_node(m))
continue;

/* scan areas before each reservation for intersection */
for ( ; ri < rsv->cnt + 1; ri++) {
116: ff c2 inc %edx
118: 48 63 c2 movslq %edx,%rax
11b: 48 39 d8 cmp %rbx,%rax
11e: 0f 82 69 ff ff ff jb 8d <__next_free_mem_range+0x8d>
124: 41 ff c6 inc %r14d
127: 8b 4d d0 mov -0x30(%rbp),%ecx
12a: 45 8d 3c 0e lea (%r14,%rcx,1),%r15d
struct memblock_type *mem = &memblock.memory;
struct memblock_type *rsv = &memblock.reserved;
int mi = *idx & 0xffffffff;
int ri = *idx >> 32;

for ( ; mi < mem->cnt; mi++) {
12e: 4d 63 ef movslq %r15d,%r13
131: 4c 3b 6d c8 cmp -0x38(%rbp),%r13
135: 0f 82 24 ff ff ff jb 5f <__next_free_mem_range+0x5f>
}
}
}

/* signal end of iteration */
*idx = ULLONG_MAX;
13b: 48 8b 45 b8 mov -0x48(%rbp),%rax
13f: 48 c7 00 ff ff ff ff movq $0xffffffffffffffff,(%rax)
}
146: 48 83 c4 38 add $0x38,%rsp
14a: 5b pop %rbx
14b: 41 5c pop %r12
14d: 41 5d pop %r13
14f: 41 5e pop %r14
151: 41 5f pop %r15
153: c9 leaveq
154: c3 retq

> * Can you please try the following patch?
>
> https://lkml.org/lkml/2012/6/15/510

The patch didn't seem to help.

Since this is pretty easy to reproduce, let me know if adding any debug code will prove to be helpful in further analysis.




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