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[Bug 1912790] Re: qemu-aarch64-static segfaults python3

From: Philippe Mathieu-Daudé
Subject: [Bug 1912790] Re: qemu-aarch64-static segfaults python3
Date: Wed, 27 Jan 2021 19:19:31 -0000

** Changed in: qemu
       Status: New => Invalid

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  qemu-aarch64-static segfaults python3

Status in QEMU:

Bug description:
  qemu-aarch64-static is segfaulting in a debian build process using

  Type "apropos word" to search for commands related to "word"...
  Reading symbols from /usr/bin/qemu-aarch64-static...
  Reading symbols from 
  [New LWP 21817]
  [New LWP 21819]

  warning: Corrupted shared library list: 0xd5f140 != 0x0
  Warning: couldn't activate thread debugging using libthread_db: Cannot find 
new threads: debugger service failed
  Core was generated by `/usr/bin/qemu-aarch64-static /usr/bin/python3.9 -c 
import imp; print(imp.get_ta'.
  Program terminated with signal SIGSEGV, Segmentation fault.
  #0  have_mmap_lock () at ../../linux-user/mmap.c:43
  43          return mmap_lock_count > 0 ? true : false;
  [Current thread is 1 (LWP 21817)]
  (gdb) bt
  #0  have_mmap_lock () at ../../linux-user/mmap.c:43
  #1  0x000000000058eb2c in page_set_flags (start=start@entry=4194304, 
end=end@entry=26451968, flags=flags@entry=8) at 
  #2  0x00000000005638cd in target_mmap (start=start@entry=4194304, 
len=<optimized out>, len@entry=22257160, target_prot=target_prot@entry=0, 
      fd=fd@entry=-1, offset=offset@entry=0) at ../../linux-user/mmap.c:602
  #3  0x000000000057042d in load_elf_image (image_name=0x7ffff7b7e8d8 
"/usr/bin/python3.9", image_fd=3, info=info@entry=0x7ffff7b7ce70, 
bprm_buf=bprm_buf@entry=0x7ffff7b7d080 "\177ELF\002\001\001") at 
  #4  0x0000000000570b9c in load_elf_binary (bprm=bprm@entry=0x7ffff7b7d080, 
info=info@entry=0x7ffff7b7ce70) at ../../linux-user/elfload.c:3104
  #5  0x00000000005c2fdb in loader_exec (fdexec=fdexec@entry=3, 
filename=<optimized out>, argv=argv@entry=0x2622910, envp=envp@entry=0x2686340, 
      regs=regs@entry=0x7ffff7b7cf70, infop=infop@entry=0x7ffff7b7ce70, 
bprm=<optimized out>) at ../../linux-user/linuxload.c:147
  #6  0x00000000004027f7 in main (argc=<optimized out>, argv=0x7ffff7b7d638, 
envp=<optimized out>) at ../../linux-user/main.c:810

  (gdb) i r
  rax            0x0                 0
  rbx            0x400000            4194304
  rcx            0x7a95d2            8033746
  rdx            0x8                 8
  rsi            0x193a000           26451968
  rdi            0x400000            4194304
  rbp            0x400000            0x400000
  rsp            0x7ffff7b7c978      0x7ffff7b7c978
  r8             0xffffffff          4294967295
  r9             0x0                 0
  r10            0x4032              16434
  r11            0x206               518
  r12            0x193a000           26451968
  r13            0x8                 8
  r14            0x8                 8
  r15            0x193a000           26451968
  rip            0x562f20            0x562f20 <have_mmap_lock>
  eflags         0x10206             [ PF IF RF ]
  cs             0x33                51
  ss             0x2b                43
  ds             0x0                 0
  es             0x0                 0
  fs             0x0                 0
  gs             0x0                 0


  Python3.9 is run as part of the installation of python3-minimal and
  the segfaults happens reliably here. Debian versionn bullseye

  Version: qemu-aarch64 version 5.2.0 (Debian 1:5.2+dfsg-3)

  Host is a qemu-system-x86_64: Linux runner 4.19.0-13-amd64 #1 SMP
  Debian 4.19.160-2 (2020-11-28) x86_64 GNU/Linux.

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