[Qemu-devel] [Bug 1706296] Re: Booting NT 4 disk causes /home/rjones/d/qemu/cpus.c:1580:qemu_mutex_lock_iothread: assertion failed: (!qemu_mutex_iothread_locked())

[Paolo Bonzini]

There are three possibilities:

1) push qemu_mutex_lock_iothread down to cc->do_interrupt

2) change the condition in io_readx/io_writex to mr->global_locking &&
!qemu_mutex_iothread_locked()

3) both

We can do (2) for 2.10 and later ponder on doing the first.

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https://bugs.launchpad.net/bugs/1706296

Title:
  Booting NT 4 disk causes
  /home/rjones/d/qemu/cpus.c:1580:qemu_mutex_lock_iothread: assertion
  failed: (!qemu_mutex_iothread_locked())

Status in QEMU:
  New

Bug description:
  Grab the NT 4 disk from
  https://archive.org/details/Microsoft_Windows_NT_Server_Version_4.0_227-075
  -385_CD-KEY_419-1343253_1996

  Try to boot it as follows:

  qemu-system-x86_64 -hda disk.img -cdrom 
Microsoft_Windows_NT_Server_Version_4.0_227-075-385_CD-KEY_419-1343253_1996.iso 
-m 2048 -boot d -machine pc,accel=tcg
  WARNING: Image format was not specified for 'disk.img' and probing guessed 
raw.
           Automatically detecting the format is dangerous for raw images, 
write operations on block 0 will be restricted.
           Specify the 'raw' format explicitly to remove the restrictions.
  **
  ERROR:/home/rjones/d/qemu/cpus.c:1580:qemu_mutex_lock_iothread: assertion 
failed: (!qemu_mutex_iothread_locked())
  Aborted (core dumped)

  The stack trace in the failing thread is:

  Thread 4 (Thread 0x7fffb0418700 (LWP 21979)):
  #0  0x00007fffdd89b64b in raise () at /lib64/libc.so.6
  #1  0x00007fffdd89d450 in abort () at /lib64/libc.so.6
  #2  0x00007fffdff8c75d in g_assertion_message () at /lib64/libglib-2.0.so.0
  #3  0x00007fffdff8c7ea in g_assertion_message_expr ()
      at /lib64/libglib-2.0.so.0
  #4  0x00005555557a7d00 in qemu_mutex_lock_iothread ()
      at /home/rjones/d/qemu/cpus.c:1580
  #5  0x00005555557cb429 in io_writex (address@hidden, 
iotlbentry=0x55555675b678, 
      address@hidden, address@hidden, address@hidden, retaddr=0, 
address@hidden, address@hidden)
      at /home/rjones/d/qemu/accel/tcg/cputlb.c:795
  #6  0x00005555557ce0f7 in io_writel (retaddr=93825011136120, addr=2148532220, 
val=8, index=255, mmu_idx=21845, env=0x555556751400)
      at /home/rjones/d/qemu/softmmu_template.h:265
  #7  0x00005555557ce0f7 in helper_le_stl_mmu (address@hidden, address@hidden, 
address@hidden, oi=<optimized out>, retaddr=93825011136120, address@hidden) at 
/home/rjones/d/qemu/softmmu_template.h:300
  #8  0x000055555587c0a4 in cpu_stl_kernel_ra (env=0x555556751400, 
ptr=2148532220, v=8, retaddr=0) at 
/home/rjones/d/qemu/include/exec/cpu_ldst_template.h:182
  #9  0x0000555555882610 in do_interrupt_protected (is_hw=<optimized out>, 
next_eip=<optimized out>, error_code=2, is_int=<optimized out>, 
intno=<optimized out>, env=0x555556751400) at 
/home/rjones/d/qemu/target/i386/seg_helper.c:758
  #10 0x0000555555882610 in do_interrupt_all (address@hidden, intno=<optimized 
out>, is_int=<optimized out>, error_code=2, next_eip=<optimized out>, 
address@hidden) at /home/rjones/d/qemu/target/i386/seg_helper.c:1252
  #11 0x00005555558839d3 in x86_cpu_do_interrupt (cs=0x555556749170)
      at /home/rjones/d/qemu/target/i386/seg_helper.c:1298
  #12 0x00005555557d2ccb in cpu_handle_exception (ret=<synthetic pointer>, 
cpu=0x5555566a4590) at /home/rjones/d/qemu/accel/tcg/cpu-exec.c:465
  #13 0x00005555557d2ccb in cpu_exec (address@hidden)
      at /home/rjones/d/qemu/accel/tcg/cpu-exec.c:670
  #14 0x00005555557a855a in tcg_cpu_exec (cpu=0x555556749170)
      at /home/rjones/d/qemu/cpus.c:1270
  #15 0x00005555557a855a in qemu_tcg_rr_cpu_thread_fn (arg=<optimized out>)
      at /home/rjones/d/qemu/cpus.c:1365
  #16 0x00007fffddc3d36d in start_thread () at /lib64/libpthread.so.0
  #17 0x00007fffdd975b9f in clone () at /lib64/libc.so.6

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