K 10
svn:author
V 6
jilles
K 8
svn:date
V 27
2017-03-12T18:38:03.229386Z
K 7
svn:log
V 563
MFC r314686: sh: Fix crash if a -T trap is taken during command substitution

Code like  t=$(stat -f %m "$file")  segfaulted if -T was active and a trap
was taken while the shell was waiting for the child process to finish.

What happened was that the dotrap() call in waitforjob() was hit. This
re-entered command execution (including expand.c) at a point not expected by
expbackq(), and global state (unallocated stack string and argbackq) was
corrupted.

To fix this, change expbackq() to prepare for command execution to be
re-entered.

Reported by:	bdrewery

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