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[binutils-gdb/gdb-7.10-branch] ASAN attach crash - 7.9 regression

*** TEST RESULTS FOR COMMIT fa68327bb429223d98887fa43db67fbb49629eb1 ***

Author: Jan Kratochvil <jan.kratochvil@redhat.com>
Branch: gdb-7.10-branch
Commit: fa68327bb429223d98887fa43db67fbb49629eb1

ASAN attach crash - 7.9 regression

-fsanitize=address
gdb.base/attach-pie-noexec.exp

==32586==ERROR: AddressSanitizer: heap-use-after-free on address 0x60200004ed90 at pc 0x48ad50 bp 0x7ffceb3aef50 sp 0x7ffceb3aef20
READ of size 2 at 0x60200004ed90 thread T0
    #0 0x48ad4f in __interceptor_strlen (/home/jkratoch/redhat/gdb-test-asan/gdb/gdb+0x48ad4f)
    #1 0xeafe5c in xstrdup xstrdup.c:33
    #2 0x85e024 in attach_command /home/jkratoch/redhat/gdb-test-asan/gdb/infcmd.c:2680

regressed by:

commit 6c4486e63f7583ed85a0c72841f6ccceebbf858e
Author: Pedro Alves <palves@redhat.com>
Date:   Fri Oct 17 13:31:26 2014 +0100
    PR gdb/17471: Repeating a background command makes it foreground

gdb/ChangeLog
2015-08-04  Jan Kratochvil  <jan.kratochvil@redhat.com>

	PR gdb/18767
	* infcmd.c (attach_command): Move ARGS_CHAIN cleanup after last ARGS
	use.
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