[Qemu-devel] [Bug 1673976] Re: core dump

[Dominique Belhachemi]

It is possible to reproduce the issue with a simple clone example taken
from

   http://man7.org/linux/man-pages/man2/clone.2.html


# qemu-aarch64-static -strace  ./a.out testname
585 brk(NULL) = 0x0000004000013000
585 uname(0x4000812d08) = 0
585 faccessat(AT_FDCWD,"/etc/ld.so.nohwcap",F_OK,0x82e888) = -1 errno=2 (No 
such file or directory)
585 mmap(NULL,12288,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0) = 
0x0000004000843000
585 faccessat(AT_FDCWD,"/etc/ld.so.preload",R_OK,AT_SYMLINK_NOFOLLOW|0x82d848) 
= -1 errno=2 (No such file or directory)
585 openat(AT_FDCWD,"/etc/ld.so.cache",O_RDONLY|O_CLOEXEC) = 3
585 fstat(3,0x0000004000812680) = 0
585 mmap(NULL,20645,PROT_READ,MAP_PRIVATE,3,0) = 0x0000004000846000
585 close(3) = 0
585 faccessat(AT_FDCWD,"/etc/ld.so.nohwcap",F_OK,0x82e888) = -1 errno=2 (No 
such file or directory)
585 openat(AT_FDCWD,"/lib/aarch64-linux-gnu/libc.so.6",O_RDONLY|O_CLOEXEC) = 3
585 read(3,0x812830,832) = 832
585 fstat(3,0x00000040008126d0) = 0
585 mmap(NULL,1393456,PROT_EXEC|PROT_READ,MAP_PRIVATE|MAP_DENYWRITE,3,0) = 
0x000000400084c000
585 mprotect(0x0000004000987000,65536,PROT_NONE) = 0
585 
mmap(0x0000004000997000,24576,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_DENYWRITE|MAP_FIXED,3,0x13b000)
 = 0x0000004000997000
585 
mmap(0x000000400099d000,13104,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS|MAP_FIXED,-1,0)
 = 0x000000400099d000
585 close(3) = 0
585 mprotect(0x0000004000997000,16384,PROT_READ) = 0
585 mprotect(0x0000004000011000,4096,PROT_READ) = 0
585 mprotect(0x0000004000840000,4096,PROT_READ) = 0
585 munmap(0x0000004000846000,20645) = 0
585 brk(NULL) = 0x0000004000013000
585 brk(0x0000004000034000) = 0x0000004000013000
585 mmap(NULL,1048576,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0) = 
0x00000040009a1000
585 mmap(NULL,1052672,PROT_READ|PROT_WRITE,MAP_PRIVATE|MAP_ANONYMOUS,-1,0) = 
0x0000004000aa1000
585 
clone(CLONE_NEWUTS|0x11,child_stack=0x0000004000ba1010,parent_tidptr=0x0000004000aa1010,tls=0x0000000000000000,child_tidptr=0x0000000000000000)
 = -1 errno=22 (Invalid argument)
585 dup(2,4222427270,274886578000,22,0,0) = 3
585 fcntl(3,F_GETFL) = 1026
585 fstat(3,0x0000004000812628) = 0
585 write(3,0x9a1490,24)clone: Invalid argument
 = 24
585 close(3) = 0
585 exit_group(1)


# strace ./a.out testname
qemu: Unsupported syscall: 117
qemu: Unsupported syscall: 117
/usr/bin/strace: ptrace(PTRACE_TRACEME, ...): Function not implemented
+++ exited with 1 +++

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https://bugs.launchpad.net/bugs/1673976

Title:
  core dump

Status in QEMU:
  New

Bug description:
  I'm running a command (locale-gen) inside of an armv7h chroot mounted
  on my x86_64 desktop by putting qemu-arm-static into /usr/bin/ of the
  chroot file system and I get a core dump.

  locale-gen
  Generating locales...
    en_US.UTF-8...localedef: ../sysdeps/unix/sysv/linux/spawni.c:360: 
__spawnix: Assertion `ec >= 0' failed.
  qemu: uncaught target signal 6 (Aborted) - core dumped
  /usr/bin/locale-gen: line 41:    34 Aborted                 (core dumped) 
localedef -i $input -c -f $charset -A /usr/share/locale/locale.alias $locale

  I've done this same thing successfully for years, but this breakage
  has appeared some time in the last 3 or so months. Possibly with the
  update to qemu version 2.8.

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