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      1 #!/bin/sh
      2 
      3 # allocfail.sh -- Test for libbacktrace library.
      4 # Copyright (C) 2018-2022 Free Software Foundation, Inc.
      5 
      6 # Redistribution and use in source and binary forms, with or without
      7 # modification, are permitted provided that the following conditions are
      8 # met:
      9 
     10 #     (1) Redistributions of source code must retain the above copyright
     11 #     notice, this list of conditions and the following disclaimer.
     12 
     13 #     (2) Redistributions in binary form must reproduce the above copyright
     14 #     notice, this list of conditions and the following disclaimer in
     15 #     the documentation and/or other materials provided with the
     16 #     distribution.
     17 
     18 #     (3) The name of the author may not be used to
     19 #     endorse or promote products derived from this software without
     20 #     specific prior written permission.
     21 
     22 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     24 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     25 # DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     26 # INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     27 # (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     28 # SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29 # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     30 # STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
     31 # IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     32 # POSSIBILITY OF SUCH DAMAGE.
     33 
     34 set -e
     35 
     36 if [ ! -f ./allocfail ]; then
     37     # Hard failure.
     38     exit 99
     39 fi
     40 
     41 allocs=$(./allocfail 2>&1)
     42 if [ "$allocs" = "" ]; then
     43     # Hard failure.
     44     exit 99
     45 fi
     46 
     47 # This generates the following output:
     48 # ...
     49 # $ allocfail.sh
     50 # allocs: 80495
     51 # Status changed to 0 at 1
     52 # Status changed to 1 at 3
     53 # Status changed to 0 at 11
     54 # Status changed to 1 at 12
     55 # Status changed to 0 at 845
     56 # ...
     57 #
     58 # We have status 0 for an allocation failure at:
     59 # - 1 because backtrace_create_state handles failure robustly
     60 # - 2 because the fail switches backtrace_full to !can_alloc mode.
     61 # - 11 because failure of elf_open_debugfile_by_buildid does not generate an
     62 #   error callback beyond the one for the allocation failure itself.
     63 
     64 echo "allocs: $allocs"
     65 
     66 step=1
     67 i=1
     68 passes=0
     69 prev_status=-1
     70 while [ $i -le $allocs ]; do
     71     if ./allocfail $i >/dev/null 2>&1; status=$?; then
     72 	true
     73     fi
     74     if [ $status -gt 1 ]; then
     75 	echo "Unallowed fail found: $i"
     76 	# Failure.
     77 	exit 1
     78     fi
     79 
     80     # The test-case would run too long if we would excercise all allocs.
     81     # So, run with step 1 initially, and increase the step once we have 10
     82     # subsequent passes, and drop back to step 1 once we encounter another
     83     # failure.  This takes ~2.6 seconds on an i7-6600U CPU @ 2.60GHz.
     84     if [ $status -eq 0 ]; then
     85 	passes=$(($passes + 1))
     86 	if [ $passes -ge 10 ]; then
     87 	    step=$((step * 10))
     88 	    passes=0
     89 	fi
     90     elif [ $status -eq 1 ]; then
     91 	passes=0
     92 	step=1
     93     fi
     94 
     95     if [ $status -ne $prev_status ]; then
     96 	echo "Status changed to $status at $i"
     97     fi
     98     prev_status=$status
     99 
    100     i=$(($i + $step))
    101 done
    102 
    103 # Success.
    104 exit 0
    105