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+
+qemu-3.1.0-rc0: mips emulation hangs when executing invalid instructions
+
+QEMU version:
+-------------
+
+qemu-3.1.0-rc0 compiled from sources (earlier versions also affected)
+
+Summary:
+--------
+
+QEMU MIPS system emulation hangs when trying to execute the following invalid instructions:
+
+71c5a9bf       sdbbp 0x716a6
+2c4745aa       sltiu a3, v0, 0x45aa
+f47539fb       sdc1 f21, 0x39fb(v1)
+5fa5e284       invalid
+
+qemu-system-mips falls under an infinite loop condition and it needs to be ended.
+
+The issue has been reproduced in Ubuntu x64 host running Debian MIPS 32-bits guest with the following command line:
+
+qemu-system-mips -M malta -kernel vmlinux-3.2.0-4-4kc-malta -hda debian_wheezy_mips_standard.qcow2 -append "root=/dev/sda1 console=tty0"
+
+It can also be reproduced using mips-linux-user, in which case throws the following exception:
+
+qemu-mips mips_loop_static.elf
+qemu: unhandled CPU exception 0x10 - aborting
+pc=0x004a9da0 HI=0x00000003 LO=0x00000002 ds 00e2 004a9da0 0
+GPR00: r0 00000000 at fffffff8 v0 004a9da0 v1 004ad000
+GPR04: a0 00000001 a1 7fffefc4 a2 7fffefcc a3 00000000
+GPR08: t0 004ab854 t1 0ffffffe t2 81010100 t3 2f2f2f2f
+GPR12: t4 7ffff1ad t5 004ab090 t6 004ab06c t7 004ab07c
+GPR16: s0 00000000 s1 452ac505 s2 00400db4 s3 00400d38
+GPR20: s4 00000000 s5 00000000 s6 00000000 s7 00000000
+GPR24: t8 004ab0a8 t9 004a9da0 k0 00000000 k1 00000000
+GPR28: gp 004b25a0 sp 7fffeec0 s8 7fffeec0 ra 0040041c
+CP0 Status  0x24000010 Cause   0x00000000 EPC    0x00000000
+    Config0 0x80008482 Config1 0x9e190c8f LLAddr 0xffffffffffffffff
+    Config2 0x80000000 Config3 0x00000000
+    Config4 0x00000000 Config5 0x00000000
+qemu:handle_cpu_signal received signal outside vCPU context @ pc=0x602dbad8
+
+Testcase:
+---------
+
+C program to reproduce the problem:
+
+unsigned char code[] = "\x71\xC5\xA9\xBF\x2C\x47\x45\xAA\xF4\x75\x39\xFB\x5F\xA5\xE2\x84";
+main()
+{
+  int (*ret)() = (int(*)())code;
+  ret();
+}
+
+Also, find a statically compiled ELF attached.
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