[Qemu-devel] [Bug 1596160] Re: SIGSEGV in memory_region_access_valid on Sabre Lite board

[berte]

This issue as same as when I build yocto sabrelite build. You can find detailed 
information as below:
berte [ ~/playground/fsl-arm-yocto-bsp/hmi_test/tmp/deploy/images/imx6dlsabresd 
]$ gdb --args  ~/playground/qemu/debug/arm-softmmu/qemu-system-arm -smp 4 -M 
sabrelite -m 1024M -kernel u-boot.imx-sd
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Reading symbols from 
/home/berte/playground/qemu/debug/arm-softmmu/qemu-system-arm...done.
(gdb) r
Starting program: /home/berte/playground/qemu/debug/arm-softmmu/qemu-system-arm 
-smp 4 -M sabrelite -m 1024M -kernel u-boot.imx-sd
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffeb37b700 (LWP 8652)]
[New Thread 0x7fffd63ca700 (LWP 8653)]
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fffd63ca700 (LWP 8653)]
0x00005555557ac1fa in memory_region_access_valid (mr=0x7ffff7f2b0e0, addr=0, 
size=1, is_write=true) at /home/berte/playground/qemu/memory.c:1143
1143        if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
(gdb) bt
#0  0x00005555557ac1fa in memory_region_access_valid (mr=0x7ffff7f2b0e0, 
addr=0, size=1, is_write=true) at /home/berte/playground/qemu/memory.c:1143
#1  0x00005555557ac663 in memory_region_dispatch_write (mr=0x7ffff7f2b0e0, 
addr=0, data=0, size=1, attrs=...) at /home/berte/playground/qemu/memory.c:1249
#2  0x00005555557b24f4 in io_writeb (env=0x7ffff7ea62f8, 
iotlbentry=0x7ffff7eb9688, val=0 '\000', addr=0, retaddr=140736862856889)
    at /home/berte/playground/qemu/softmmu_template.h:369
#3  0x00005555557b2837 in helper_ret_stb_mmu (env=0x7ffff7ea62f8, addr=0, val=0 
'\000', oi=4, retaddr=140736862856889)
    at /home/berte/playground/qemu/softmmu_template.h:409
#4  0x00007fffdab7a6bb in code_gen_buffer ()
#5  0x000055555576a056 in cpu_tb_exec (cpu=0x7ffff7e9e080, itb=0x7fffd63cb240) 
at /home/berte/playground/qemu/cpu-exec.c:166
#6  0x000055555576ab3a in cpu_loop_exec_tb (cpu=0x7ffff7e9e080, 
tb=0x7fffd63cb240, last_tb=0x7fffd63c9a68, tb_exit=0x7fffd63c9a64, 
sc=0x7fffd63c9a80)
    at /home/berte/playground/qemu/cpu-exec.c:530
#7  0x000055555576ae26 in cpu_arm_exec (cpu=0x7ffff7e9e080) at 
/home/berte/playground/qemu/cpu-exec.c:626
#8  0x000055555579483a in tcg_cpu_exec (cpu=0x7ffff7e9e080) at 
/home/berte/playground/qemu/cpus.c:1541
#9  0x0000555555794925 in tcg_exec_all () at 
/home/berte/playground/qemu/cpus.c:1574
#10 0x0000555555793d05 in qemu_tcg_cpu_thread_fn (arg=0x7ffff7e9e080) at 
/home/berte/playground/qemu/cpus.c:1171
#11 0x00007ffff56ec434 in start_thread () from /lib64/libpthread.so.0
#12 0x00007ffff0fbb28d in clone () from /lib64/libc.so.6
(gdb) disas
Dump of assembler code for function memory_region_access_valid:
   0x00005555557ac1da <+0>:     push   %rbp
   0x00005555557ac1db <+1>:     mov    %rsp,%rbp
   0x00005555557ac1de <+4>:     sub    $0x30,%rsp
   0x00005555557ac1e2 <+8>:     mov    %rdi,-0x18(%rbp)
   0x00005555557ac1e6 <+12>:    mov    %rsi,-0x20(%rbp)
   0x00005555557ac1ea <+16>:    mov    %edx,-0x24(%rbp)
   0x00005555557ac1ed <+19>:    mov    %ecx,%eax
   0x00005555557ac1ef <+21>:    mov    %al,-0x28(%rbp)
   0x00005555557ac1f2 <+24>:    mov    -0x18(%rbp),%rax
   0x00005555557ac1f6 <+28>:    mov    0x48(%rax),%rax
=> 0x00005555557ac1fa <+32>:    movzbl 0x30(%rax),%eax
   0x00005555557ac1fe <+36>:    xor    $0x1,%eax
   0x00005555557ac201 <+39>:    test   %al,%al
   0x00005555557ac203 <+41>:    je     0x5555557ac220 
<memory_region_access_valid+70>
   0x00005555557ac205 <+43>:    mov    -0x24(%rbp),%eax
   0x00005555557ac208 <+46>:    sub    $0x1,%eax
   0x00005555557ac20b <+49>:    mov    %eax,%eax
   0x00005555557ac20d <+51>:    and    -0x20(%rbp),%rax
   0x00005555557ac211 <+55>:    test   %rax,%rax
   0x00005555557ac214 <+58>:    je     0x5555557ac220 
<memory_region_access_valid+70>
   0x00005555557ac216 <+60>:    mov    $0x0,%eax
   0x00005555557ac21b <+65>:    jmpq   0x5555557ac2f1 
<memory_region_access_valid+279>
   0x00005555557ac220 <+70>:    mov    -0x18(%rbp),%rax
   0x00005555557ac224 <+74>:    mov    0x48(%rax),%rax
   0x00005555557ac228 <+78>:    mov    0x38(%rax),%rax
   0x00005555557ac22c <+82>:    test   %rax,%rax
   0x00005555557ac22f <+85>:    jne    0x5555557ac23b 
<memory_region_access_valid+97>
   0x00005555557ac231 <+87>:    mov    $0x1,%eax
   0x00005555557ac236 <+92>:    jmpq   0x5555557ac2f1 
<memory_region_access_valid+279>
   0x00005555557ac23b <+97>:    mov    -0x18(%rbp),%rax
   0x00005555557ac23f <+101>:   mov    0x48(%rax),%rax
   0x00005555557ac243 <+105>:   mov    0x28(%rax),%eax
   0x00005555557ac246 <+108>:   mov    %eax,-0x10(%rbp)
   0x00005555557ac249 <+111>:   mov    -0x18(%rbp),%rax
   0x00005555557ac24d <+115>:   mov    0x48(%rax),%rax
   0x00005555557ac251 <+119>:   mov    0x28(%rax),%eax
   0x00005555557ac254 <+122>:   test   %eax,%eax
   0x00005555557ac256 <+124>:   jne    0x5555557ac25f 
<memory_region_access_valid+133>
   0x00005555557ac258 <+126>:   movl   $0x1,-0x10(%rbp)
   0x00005555557ac25f <+133>:   mov    -0x18(%rbp),%rax
   0x00005555557ac263 <+137>:   mov    0x48(%rax),%rax
   0x00005555557ac267 <+141>:   mov    0x2c(%rax),%eax
---Type <return> to continue, or q <return> to quit--- 
   0x00005555557ac26a <+144>:   mov    %eax,-0xc(%rbp)
   0x00005555557ac26d <+147>:   mov    -0x18(%rbp),%rax
   0x00005555557ac271 <+151>:   mov    0x48(%rax),%rax
   0x00005555557ac275 <+155>:   mov    0x2c(%rax),%eax
   0x00005555557ac278 <+158>:   test   %eax,%eax
   0x00005555557ac27a <+160>:   jne    0x5555557ac283 
<memory_region_access_valid+169>
   0x00005555557ac27c <+162>:   movl   $0x4,-0xc(%rbp)
   0x00005555557ac283 <+169>:   mov    -0xc(%rbp),%edx
   0x00005555557ac286 <+172>:   mov    -0x24(%rbp),%eax
   0x00005555557ac289 <+175>:   cmp    %eax,%edx
   0x00005555557ac28b <+177>:   cmova  %eax,%edx
   0x00005555557ac28e <+180>:   mov    -0x10(%rbp),%eax
   0x00005555557ac291 <+183>:   cmp    %eax,%edx
   0x00005555557ac293 <+185>:   cmovae %edx,%eax
   0x00005555557ac296 <+188>:   mov    %eax,-0x4(%rbp)
   0x00005555557ac299 <+191>:   movl   $0x0,-0x8(%rbp)
   0x00005555557ac2a0 <+198>:   jmp    0x5555557ac2e4 
<memory_region_access_valid+266>
   0x00005555557ac2a2 <+200>:   mov    -0x18(%rbp),%rax
   0x00005555557ac2a6 <+204>:   mov    0x48(%rax),%rax
   0x00005555557ac2aa <+208>:   mov    0x38(%rax),%rax
   0x00005555557ac2ae <+212>:   movzbl -0x28(%rbp),%ecx
   0x00005555557ac2b2 <+216>:   mov    -0x4(%rbp),%edx
   0x00005555557ac2b5 <+219>:   mov    -0x8(%rbp),%esi
   0x00005555557ac2b8 <+222>:   movslq %esi,%rdi
   0x00005555557ac2bb <+225>:   mov    -0x20(%rbp),%rsi
   0x00005555557ac2bf <+229>:   lea    (%rdi,%rsi,1),%r8
   0x00005555557ac2c3 <+233>:   mov    -0x18(%rbp),%rsi
   0x00005555557ac2c7 <+237>:   mov    0x50(%rsi),%rdi
   0x00005555557ac2cb <+241>:   mov    %r8,%rsi
   0x00005555557ac2ce <+244>:   callq  *%rax
   0x00005555557ac2d0 <+246>:   xor    $0x1,%eax
   0x00005555557ac2d3 <+249>:   test   %al,%al
   0x00005555557ac2d5 <+251>:   je     0x5555557ac2de 
<memory_region_access_valid+260>
   0x00005555557ac2d7 <+253>:   mov    $0x0,%eax
   0x00005555557ac2dc <+258>:   jmp    0x5555557ac2f1 
<memory_region_access_valid+279>
   0x00005555557ac2de <+260>:   mov    -0x4(%rbp),%eax
   0x00005555557ac2e1 <+263>:   add    %eax,-0x8(%rbp)
   0x00005555557ac2e4 <+266>:   mov    -0x8(%rbp),%eax
   0x00005555557ac2e7 <+269>:   cmp    -0x24(%rbp),%eax
   0x00005555557ac2ea <+272>:   jb     0x5555557ac2a2 
<memory_region_access_valid+200>
   0x00005555557ac2ec <+274>:   mov    $0x1,%eax
   0x00005555557ac2f1 <+279>:   leaveq 
   0x00005555557ac2f2 <+280>:   retq   
---Type <return> to continue, or q <return> to quit---
End of assembler dump.
(gdb) 
(gdb) info reg
rax            0x0      0
rbx            0x4      4
rcx            0x1      1
rdx            0x1      1
rsi            0x0      0
rdi            0x7ffff7f2b0e0   140737353265376
rbp            0x7fffd63c93c0   0x7fffd63c93c0
rsp            0x7fffd63c9390   0x7fffd63c9390
r8             0x6      6
r9             0x7      7
r10            0x0      0
r11            0x217    535
r12            0x0      0
r13            0x7fffffffd70f   140737488344847
r14            0x7ffff7ea62f8   140737352721144
r15            0x7fffffffd7d0   140737488345040
rip            0x5555557ac1fa   0x5555557ac1fa <memory_region_access_valid+32>
eflags         0x10206  [ PF IF RF ]
cs             0x33     51
ss             0x2b     43
ds             0x0      0
es             0x0      0
fs             0x0      0
gs             0x0      0
(gdb)

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https://bugs.launchpad.net/bugs/1596160

Title:
  SIGSEGV in memory_region_access_valid on Sabre Lite board

Status in QEMU:
  New

Bug description:
  I'm trying to emulate a Sabre Lite board and booting U-Boot, but I'm
  encountering a SIGSEGV almost immediately after starting QEMU.

  QEMU version: 6f1d2d1c5ad20d464705b17318cb7ca495f8078a
  U-Boot version: mx6qsabrelite_defconfig 2016.05 (with 
http://git.denx.de/?p=u-boot.git;a=commitdiff;h=1f516faa45611aedc8c2e3f303b3866f615d481e
 reverted, since it hangs the CPU)

  $ gdb --args ./arm-softmmu/qemu-system-arm -machine sabrelite -kernel 
~/u-boot-2016.05/u-boot
  GNU gdb (Ubuntu 7.7.1-0ubuntu5~14.04.2) 7.7.1

  ...

  (gdb) r
  Starting program: /home/kota/qemu/build/arm-softmmu/qemu-system-arm -machine 
sabrelite -kernel /home/kota/u-boot-2016.05/u-boot
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
  [New Thread 0x7fffe9074700 (LWP 18025)]
  [New Thread 0x7fffe58c0700 (LWP 18027)]

  Program received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 0x7fffe58c0700 (LWP 18027)]
  0x00005555557aaaa8 in memory_region_access_valid (address@hidden, 
address@hidden, address@hidden, address@hidden) at /home/kota/qemu/memory.c:1143
  1143      if (!mr->ops->valid.unaligned && (addr & (size - 1))) {
  (gdb) print mr->ops
  $1 = (const MemoryRegionOps *) 0x0
  (gdb) print *mr
  $2 = {parent_obj = {class = 0x555556678990, free = 0x0, properties = 
0x555557002d20, ref = 1, parent = 0x555556693d10}, romd_mode = true, ram = 
false, subpage = false, readonly = false, rom_device = true, 
    flush_coalesced_mmio = false, global_locking = true, dirty_log_mask = 0 
'\000', ram_block = 0x5555570228f0, owner = 0x0, iommu_ops = 0x0, ops = 0x0, 
opaque = 0x0, container = 0x555556693980, size = {
      lo = 98304, hi = 0}, addr = 0, destructor = 0x5555557a70b0 
<memory_region_destructor_rom_device>, align = 2097152, terminates = true, 
skip_dump = false, enabled = true, warning_printed = false, 
    vga_logging_count = 0 '\000', alias = 0x0, alias_offset = 0, priority = 0, 
subregions = {tqh_first = 0x0, tqh_last = 0x7fffe594e188}, subregions_link = 
{tqe_next = 0x7fffe594d988, tqe_prev = 0x7fffe594e290}, 
    coalesced = {tqh_first = 0x0, tqh_last = 0x7fffe594e1a8}, name = 
0x555557022710 "imx6.rom", ioeventfd_nb = 0, ioeventfds = 0x0, iommu_notify = 
{notifiers = {lh_first = 0x0}}}
  (gdb) bt
  #0  0x00005555557aaaa8 in memory_region_access_valid (address@hidden, 
address@hidden, address@hidden, address@hidden) at /home/kota/qemu/memory.c:1143
  #1  0x00005555557aacbd in memory_region_dispatch_write (mr=0x7fffe594e0e0, 
addr=0, data=3925868734, size=4, attrs=...) at /home/kota/qemu/memory.c:1249
  #2  0x00007fffe645a4e4 in code_gen_buffer ()
  #3  0x0000555555778d4d in cpu_tb_exec (itb=<optimized out>, itb=<optimized 
out>, cpu=0x7fffe58c92e0) at /home/kota/qemu/cpu-exec.c:166
  #4  cpu_loop_exec_tb (sc=0x7fffe58bfab0, tb_exit=<synthetic pointer>, 
last_tb=0x7fffe58bfaa0, tb=<optimized out>, cpu=0x7fffe58c92e0) at 
/home/kota/qemu/cpu-exec.c:530
  #5  cpu_arm_exec (address@hidden) at /home/kota/qemu/cpu-exec.c:626
  #6  0x0000555555798a20 in tcg_cpu_exec (cpu=0x7fffe58c1080) at 
/home/kota/qemu/cpus.c:1541
  #7  tcg_exec_all () at /home/kota/qemu/cpus.c:1574
  #8  qemu_tcg_cpu_thread_fn (arg=<optimized out>) at 
/home/kota/qemu/cpus.c:1171
  #9  0x00007ffff27f1184 in start_thread (arg=0x7fffe58c0700) at 
pthread_create.c:312
  #10 0x00007ffff251e37d in clone () at 
../sysdeps/unix/sysv/linux/x86_64/clone.S:111

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