m68k 54418 fails to execute user space

Jean-Michel Hautbois jeanmichel.hautbois at yoseli.org
Sat Jun 29 00:57:08 PDT 2024 

Michael,

On 29/06/2024 05:41, Michael Schmitz wrote:
> Jean-Michel,
> 
> Am 28.06.2024 um 23:25 schrieb Jean-Michel Hautbois:
>>>
>>> No heap in this second call. Can you print mm->start_brk and mm->brk
>>> please?
>>>
>>> The process memory layout is a little unusual (I would have expected
>>> the binary to be mapped before the dynamic libraries, not after). Is
>>> that expected on Coldfire, Greg?
>>>
>>
>> I did the test, and called ls twice to see what differs:
>> bash-5.2# ls -l > /dev/null
>> load_elf_binary: Dump memory for ls (31):
>> mmap: start_brk: 700ca000, brk: 700ca000
>> mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
>> mmap: 6001e000-60022000 rw-p 0001c000 00:00 178 /lib/ld.so.1
>> mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
>> mmap: 700c2000-700ca000 rw-p 000c0000 00:00 28 /bin/busybox
>> mmap: bfa48000-bfa6a000 rw-p bffde000 00:00 0 [stack]
>> do_exit: Dump memory for ls (31):
>> mmap: start_brk: 700ca000, brk: 700ec000
> 
> ls managed to allocate heap space OK ...
> 
>> mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
>> mmap: 6001e000-60020000 r--p 0001c000 00:00 178 /lib/ld.so.1
>> mmap: 60020000-60022000 rw-p 0001e000 00:00 178 /lib/ld.so.1
>> mmap: 60022000-6002c000 r-xp 00000000 00:00 193 /lib/libresolv.so.2
>> mmap: 6002c000-6002e000 r--p 00008000 00:00 193 /lib/libresolv.so.2
>> mmap: 6002e000-60030000 rw-p 0000a000 00:00 193 /lib/libresolv.so.2
>> mmap: 60030000-60032000 rw-p 60030000 00:00 0
>> mmap: 60032000-6015a000 r-xp 00000000 00:00 185 /lib/libc.so.6
>> mmap: 6015a000-6015c000 r--p 00126000 00:00 185 /lib/libc.so.6
>> mmap: 6015c000-60160000 rw-p 00128000 00:00 185 /lib/libc.so.6
>> mmap: 60160000-6016e000 rw-p 60160000 00:00 0
>> mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
>> mmap: 700c2000-700c4000 r--p 000c0000 00:00 28 /bin/busybox
>> mmap: 700c4000-700ca000 rw-p 000c2000 00:00 28 /bin/busybox
>> mmap: 700ca000-700ec000 rwxp 700ca000 00:00 0 [heap]
>> mmap: bfa48000-bfa6a000 rw-p bffde000 00:00 0 [stack]
>> bash-5.2# ls -l > /dev/null
>> load_elf_binary: Dump memory for ls (33):
>> mmap: start_brk: 700ca000, brk: 700ca000
>> mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
>> mmap: 6001e000-60022000 rw-p 0001c000 00:00 178 /lib/ld.so.1
>> mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
>> mmap: 700c2000-700ca000 rw-p 000c0000 00:00 28 /bin/busybox
>> mmap: bf894000-bf8b6000 rw-p bffde000 00:00 0 [stack]
>> do_exit: Dump memory for ls (33):
>> mmap: start_brk: 700ca000, brk: 700ca000
> 
> No heap space allocated here. I would have expected that to cause an 
> error message from libc ...
> 
> Can you print a brief meminfo summary such as found in fs/proc/meminfo.c 
> (total, free, available, buffer and cached for starters)?

I dumped using sysrq, before and after each ls:
bash-5.2# sysrq: Show Memory
Mem-Info:
active_anon:1 inactive_anon:39 isolated_anon:0
  active_file:0 inactive_file:223 isolated_file:0
  unevictable:0 dirty:0 writeback:0 

  slab_reclaimable:109 slab_unreclaimable:641 

  mapped:212 shmem:0 pagetables:3 

  sec_pagetables:0 bounce:0 

  kernel_misc_reclaimable:0 

  free:28227 free_pcp:200 free_cma:0
Node 0 active_anon:8kB inactive_anon:312kB active_file:0kB 
inactive_file:1784kB unevictable:0kB isolated(anon):0kB 
isolated(file):0kB mapped:1696kB dirty:0kB writeback:0kB shmem:0kB 
writeback_tmp:0kB kernel_stack:168kB pagetables:24kB s
ec_pagetables:0kB all_unreclaimable? no
DMA free:225816kB boost:0kB min:1952kB low:2440kB high:2928kB 
reserved_highatomic:0KB active_anon:8kB inactive_anon:312kB 
active_file:0kB inactive_file:1784kB unevictable:0kB writepending:0kB 
present:262144kB managed:238752kB mlocked:0k
B bounce:0kB free_pcp:1600kB local_pcp:1600kB free_cma:0kB
lowmem_reserve[]: 0 0 0
DMA: 3*8kB (UME) 0*16kB 2*32kB (UM) 1*64kB (M) 1*128kB (U) 1*256kB (U) 
2*512kB (UM) 1*1024kB (E) 3*2048kB (UME) 3*4096kB (UME) 25*8192kB (M) = 
225816kB
230 total pagecache pages
0 pages in swap cache
Free swap  = 0kB
Total swap = 0kB
32768 pages RAM
0 pages HighMem/MovableOnly
2924 pages reserved

bash-5.2# ls -l > /dev/null
load_elf_binary: Dump memory for ls (31):
mmap: start_brk: 700ca000, brk: 700ca000
mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
mmap: 6001e000-60022000 rw-p 0001c000 00:00 178 /lib/ld.so.1
mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
mmap: 700c2000-700ca000 rw-p 000c0000 00:00 28 /bin/busybox
mmap: bfb18000-bfb3a000 rw-p bffde000 00:00 0 [stack]
do_exit: Dump memory for ls (31):
mmap: start_brk: 700ca000, brk: 700ec000
mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
mmap: 6001e000-60020000 r--p 0001c000 00:00 178 /lib/ld.so.1
mmap: 60020000-60022000 rw-p 0001e000 00:00 178 /lib/ld.so.1
mmap: 60022000-6002c000 r-xp 00000000 00:00 193 /lib/libresolv.so.2
mmap: 6002c000-6002e000 r--p 00008000 00:00 193 /lib/libresolv.so.2
mmap: 6002e000-60030000 rw-p 0000a000 00:00 193 /lib/libresolv.so.2
mmap: 60030000-60032000 rw-p 60030000 00:00 0
mmap: 60032000-6015a000 r-xp 00000000 00:00 185 /lib/libc.so.6
mmap: 6015a000-6015c000 r--p 00126000 00:00 185 /lib/libc.so.6
mmap: 6015c000-60160000 rw-p 00128000 00:00 185 /lib/libc.so.6
mmap: 60160000-6016e000 rw-p 60160000 00:00 0
mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
mmap: 700c2000-700c4000 r--p 000c0000 00:00 28 /bin/busybox
mmap: 700c4000-700ca000 rw-p 000c2000 00:00 28 /bin/busybox
mmap: 700ca000-700ec000 rwxp 700ca000 00:00 0 [heap]
mmap: bfb18000-bfb3a000 rw-p bffde000 00:00 0 [stack]
bash-5.2# sysrq: Show Memory
Mem-Info:
active_anon:0 inactive_anon:47 isolated_anon:0
  active_file:83 inactive_file:197 isolated_file:0 

  unevictable:0 dirty:0 writeback:0 

  slab_reclaimable:110 slab_unreclaimable:650 

  mapped:219 shmem:0 pagetables:3 

  sec_pagetables:0 bounce:0 

  kernel_misc_reclaimable:0
  free:28206 free_pcp:160 free_cma:0
Node 0 active_anon:0kB inactive_anon:376kB active_file:664kB 
inactive_file:1576kB unevictable:0kB isolated(anon):0kB 
isolated(file):0kB mapped:1752kB dirty:0kB writeback:0kB shmem:0kB 
writeback_tmp:0kB kernel_stack:168kB pagetables:24kB
  sec_pagetables:0kB all_unreclaimable? no
DMA free:225648kB boost:0kB min:1952kB low:2440kB high:2928kB 
reserved_highatomic:0KB active_anon:0kB inactive_anon:376kB 
active_file:664kB inactive_file:1576kB unevictable:0kB writepending:0kB 
present:262144kB managed:238752kB mlocked:
0kB bounce:0kB free_pcp:1280kB local_pcp:1280kB free_cma:0kB
lowmem_reserve[]: 0 0 0
DMA: 2*8kB (UE) 0*16kB 1*32kB (U) 1*64kB (M) 2*128kB (UM) 2*256kB (UM) 
1*512kB (U) 1*1024kB (E) 3*2048kB (UME) 3*4096kB (UME) 25*8192kB (M) = 
225648kB
280 total pagecache pages
0 pages in swap cache
Free swap  = 0kB
Total swap = 0kB
32768 pages RAM
0 pages HighMem/MovableOnly
2924 pages reserved

bash-5.2# ls -l > /dev/null
load_elf_binary: Dump memory for ls (33):
mmap: start_brk: 700ca000, brk: 700ca000
mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
mmap: 6001e000-60022000 rw-p 0001c000 00:00 178 /lib/ld.so.1
mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
mmap: 700c2000-700ca000 rw-p 000c0000 00:00 28 /bin/busybox
mmap: bf89e000-bf8c0000 rw-p bffde000 00:00 0 [stack]
do_exit: Dump memory for ls (33):
mmap: start_brk: 700ca000, brk: 700ca000
mmap: 60000000-6001e000 r-xp 00000000 00:00 178 /lib/ld.so.1
mmap: 6001e000-60020000 r--p 0001c000 00:00 178 /lib/ld.so.1
mmap: 60020000-60022000 rw-p 0001e000 00:00 178 /lib/ld.so.1
mmap: 60022000-6002c000 r-xp 00000000 00:00 193 /lib/libresolv.so.2
mmap: 6002c000-6002e000 r--p 00008000 00:00 193 /lib/libresolv.so.2
mmap: 6002e000-60030000 rw-p 0000a000 00:00 193 /lib/libresolv.so.2
mmap: 60030000-60032000 rw-p 60030000 00:00 0
mmap: 60032000-6015a000 r-xp 00000000 00:00 185 /lib/libc.so.6
mmap: 6015a000-6015c000 r--p 00126000 00:00 185 /lib/libc.so.6
mmap: 6015c000-60160000 rw-p 00128000 00:00 185 /lib/libc.so.6
mmap: 60160000-6016e000 rw-p 60160000 00:00 0
mmap: 70000000-700c2000 r-xp 00000000 00:00 28 /bin/busybox
mmap: 700c2000-700c4000 r--p 000c0000 00:00 28 /bin/busybox
mmap: 700c4000-700ca000 rw-p 000c2000 00:00 28 /bin/busybox
mmap: bf89e000-bf8c0000 rw-p bffde000 00:00 0 [stack]
bash-5.2# sysrq: Show Memory
Mem-Info:
active_anon:0 inactive_anon:47 isolated_anon:0
  active_file:196 inactive_file:84 isolated_file:0
  unevictable:0 dirty:0 writeback:0
  slab_reclaimable:110 slab_unreclaimable:650
  mapped:219 shmem:0 pagetables:3
  sec_pagetables:0 bounce:0
  kernel_misc_reclaimable:0
  free:28206 free_pcp:159 free_cma:0
Node 0 active_anon:0kB inactive_anon:376kB active_file:1568kB 
inactive_file:672kB unevictable:0kB isolated(anon):0kB 
isolated(file):0kB mapped:1752kB dirty:0kB writeback:0kB shmem:0kB 
writeback_tmp:0kB kernel_stack:176kB pagetables:24kB
  sec_pagetables:0kB all_unreclaimable? no
DMA free:225648kB boost:0kB min:1952kB low:2440kB high:2928kB 
reserved_highatomic:0KB active_anon:0kB inactive_anon:376kB 
active_file:1568kB inactive_file:672kB unevictable:0kB writepending:0kB 
present:262144kB managed:238752kB mlocked:
0kB bounce:0kB free_pcp:1272kB local_pcp:1272kB free_cma:0kB
lowmem_reserve[]: 0 0 0
DMA: 2*8kB (UE) 0*16kB 1*32kB (U) 1*64kB (M) 2*128kB (UM) 2*256kB (UM) 
1*512kB (U) 1*1024kB (E) 3*2048kB (UME) 3*4096kB (UME) 25*8192kB (M) = 
225648kB
280 total pagecache pages
0 pages in swap cache
Free swap  = 0kB
Total swap = 0kB
32768 pages RAM
0 pages HighMem/MovableOnly
2924 pages reserved

JM

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