[Bug 1285363] [NEW] qemu-aarch64-static segfaults

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I've found a couple conditions that causes qemu-user-static to core dump
fairly reliably - same with upstream git - while a binary built from
suse's aarch64-1.6 branch seems to consistently work fine.

Testing suggests they are resolved by the sigprocmask wrapper patches
included in suse's tree.

 1) dh_fixperms is a script that commonly runs at the end of a package build.
     Its basically doing a `find | xargs chmod`.
 2) debootstrap --second-stage
     This is used to configure an arm64 chroot that was built using
     debootstrap on a non-native host. It is basically invoking a bunch of
     shell scripts (postinst, etc). When it blows up, the stack consistently
     looks like this:

Core was generated by `/usr/bin/qemu-aarch64-static /bin/sh -e
/debootstrap/debootstrap --second-stage'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0  0x0000000060058e55 in memcpy (__len=8, __src=0x7fff62ae34e0,
__dest=0x400082c330) at
/usr/include/x86_64-linux-gnu/bits/string3.h:51
51  return __builtin___memcpy_chk (__dest, __src, __len, __bos0 (__dest));
(gdb) bt
#0  0x0000000060058e55 in memcpy (__len=8, __src=0x7fff62ae34e0,
__dest=0x400082c330) at
/usr/include/x86_64-linux-gnu/bits/string3.h:51
#1  stq_p (v=274886476624, ptr=0x400082c330) at
/mnt/qemu.upstream/include/qemu/bswap.h:280
#2  stq_le_p (v=274886476624, ptr=0x400082c330) at
/mnt/qemu.upstream/include/qemu/bswap.h:315
#3  target_setup_sigframe (set=0x7fff62ae3530, env=0x62d9c678,
sf=0x400082b0d0) at /mnt/qemu.upstream/linux-user/signal.c:1167
#4  target_setup_frame (usig=usig at entry=17, ka=ka at entry=0x604ec1e0
<sigact_table+512>, info=info at entry=0x0, set=set at entry=0x7fff62ae3530,
env=env at entry=0x62d9c678)
    at /mnt/qemu.upstream/linux-user/signal.c:1286
#5  0x0000000060059f46 in setup_frame (env=0x62d9c678,
set=0x7fff62ae3530, ka=0x604ec1e0 <sigact_table+512>, sig=17) at
/mnt/qemu.upstream/linux-user/signal.c:1322
#6  process_pending_signals (cpu_env=cpu_env at entry=0x62d9c678) at
/mnt/qemu.upstream/linux-user/signal.c:5747
#7  0x0000000060056e60 in cpu_loop (env=env at entry=0x62d9c678) at
/mnt/qemu.upstream/linux-user/main.c:1082
#8  0x0000000060005079 in main (argc=<optimized out>, argv=<optimized
out>, envp=<optimized out>) at
/mnt/qemu.upstream/linux-user/main.c:4374

** Affects: qemu (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: hs-arm64 patch
-- 
qemu-aarch64-static segfaults
https://bugs.launchpad.net/bugs/1285363
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