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[Qemu-devel] [Bug 1457275] Re: qemu-user hangs in m{,un}map loop


From: Peter Maydell
Subject: [Qemu-devel] [Bug 1457275] Re: qemu-user hangs in m{,un}map loop
Date: Fri, 17 Jun 2016 16:40:41 -0000

This works for me so I think we must have fixed this problem at some
point between 2.3 and current master. If you still have this problem
with a QEMU build from head of git please reopen with instructions for
how to reproduce.


** Changed in: qemu
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1457275

Title:
  qemu-user hangs in m{,un}map loop

Status in QEMU:
  Fix Released

Bug description:
  Gentoo amd64 there, tried both 2.3.0 and
  eba05e922e8e7f307bc5d4104a78797e55124e97 versions of qemu. Reproduces
  with qemu-x86_64 as well.

  ∞ strace qemu-arm bin/true 2>&1| head -n 100
  execve("/usr/bin/qemu-arm", ["qemu-arm", "bin/true"], [/* 49 vars */]) = 0
  uname({sysname="Linux", nodename="l29ah-home", ...}) = 0
  brk(0)                                  = 0x62a4d070
  brk(0x62a4e2b0)                         = 0x62a4e2b0
  arch_prctl(ARCH_SET_FS, 0x62a4d980)     = 0
  set_tid_address(0x62a4dc50)             = 7841
  set_robust_list(0x62a4dc60, 24)         = 0
  rt_sigaction(SIGRTMIN, {0x6011bd10, [], SA_RESTORER|SA_SIGINFO, 0x60122710}, 
NULL, 8) = 0
  rt_sigaction(SIGRT_1, {0x6011bda0, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 
0x60122710}, NULL, 8) = 0
  rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
  getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
  readlink("/proc/self/exe", "/usr/bin/qemu-arm", 4096) = 17
  brk(0x62a6f2b0)                         = 0x62a6f2b0
  brk(0x62a70000)                         = 0x62a70000
  rt_sigprocmask(SIG_SETMASK, ~[RTMIN RT_1], [], 8) = 0
  mmap(NULL, 8392704, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x2c951ff9000
  mprotect(0x2c951ff9000, 4096, PROT_NONE) = 0
  clone(child_stack=0x2c9527f8df0, 
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
 parent_tidptr=0x2c9527f99d0, tls=0x2c9527f9700, child_tidptr=0x2c9527f99d0) = 
7842
  rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
  gettimeofday({1432174351, 569148}, NULL) = 0
  getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
  time(NULL)                              = 1432174351
  openat(AT_FDCWD, "/usr/gnemul/qemu-arm", 
O_RDONLY|O_NONBLOCK|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or 
directory)
  uname({sysname="Linux", nodename="l29ah-home", ...}) = 0
  mprotect(0x60519000, 33558528, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
  madvise(0x605190b0, 33554432, MADV_HUGEPAGE) = -1 EINVAL (Invalid argument)
  mmap(NULL, 50331648, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) 
= 0x2c94eff9000
  brk(0x62a91000)                         = 0x62a91000
  mmap(NULL, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x1000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x2000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x3000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x4000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x5000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x6000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x7000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x8000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x9000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xa000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xb000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xc000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xd000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xe000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0xf000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x10000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0
  mmap(0x11000, 4143972352, PROT_NONE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_NORESERVE, 
-1, 0) = 0x2c857ff9000
  mmap(0x2c957fe9000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, 
-1, 0) = 0x2c857ff8000
  munmap(0x2c857ff8000, 4096)             = 0
  munmap(0x2c857ff9000, 4143972352)       = 0

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