On Sat, Oct 01, 2016 at 08:14:16AM -0700, Daniel Green wrote:
> # New Ticket Created by Daniel Green
> # Please include the string: [perl #129781]
> # in the subject line of all future correspondence about this issue.
> # <URL: https://rt.perl.org/Ticket/Display.html?id=129781 >
>
>
> await (for ^7 { start ‘/etc/hostname’.IO ~~ :e })
>
> regular perl6-valgrind-m output here:
> https://gist.github.com/MasterDuke17/9ab9ec5bdbc483bfe63213bf26f82316
Nice catch. ASAN has fun:
$ ./perl6-m -Ilib -e 'await (for ^7 { start ‘/etc/hostname’.IO ~~ :e })'
=================================================================
==9674==ERROR: AddressSanitizer: attempting double-free on 0x603000381040 in
thread T4:
#0 0x7fb46d651417 in __interceptor_free
../../.././libsanitizer/asan/asan_malloc_linux.cc:62
#1 0x7fb46cc99075 in MVM_free src/core/alloc.h:29
#2 0x7fb46cca388b in MVM_string_flatten src/strings/ops.c:1241
#3 0x7fb46ca027ef in MVM_interp_run src/core/interp.c:1601
#4 0x7fb46ca9776a in start_thread src/core/threads.c:77
#5 0x7fb46cd6152d in uv__thread_start 3rdparty/libuv/src/unix/thread.c:49
#6 0x7fb46bdcfaa0 in start_thread (/lib64/libpthread.so.0+0x7aa0)
#7 0x7fb46c2d5aac in __clone (/lib64/libc.so.6+0xe8aac)
0x603000381040 is located 0 bytes inside of 24-byte region
[0x603000381040,0x603000381058)
freed by thread T1 here:
#0 0x7fb46d651417 in __interceptor_free
../../.././libsanitizer/asan/asan_malloc_linux.cc:62
#1 0x7fb46cc99075 in MVM_free src/core/alloc.h:29
#2 0x7fb46cca388b in MVM_string_flatten src/strings/ops.c:1241
#3 0x7fb46ca027ef in MVM_interp_run src/core/interp.c:1601
#4 0x7fb46ca9776a in start_thread src/core/threads.c:77
#5 0x7fb46cd6152d in uv__thread_start 3rdparty/libuv/src/unix/thread.c:49
#6 0x7fb46bdcfaa0 in start_thread (/lib64/libpthread.so.0+0x7aa0)
previously allocated by thread T0 here:
#0 0x7fb46d65162f in __interceptor_malloc
../../.././libsanitizer/asan/asan_malloc_linux.cc:72
#1 0x7fb46cc98fef in MVM_malloc src/core/alloc.h:2
#2 0x7fb46cc9b63c in allocate_strands src/strings/ops.c:27
#3 0x7fb46cc9d384 in MVM_string_substring src/strings/ops.c:294
#4 0x7fb46c9feb14 in MVM_interp_run src/core/interp.c:1467
#5 0x7fb46ccf5bf4 in MVM_vm_run_file src/moar.c:304
#6 0x401a4f in main src/main.c:191
#7 0x7fb46c20bd1c in __libc_start_main (/lib64/libc.so.6+0x1ed1c)
Thread T4 created by T0 here:
#0 0x7fb46d6206ea in __interceptor_pthread_create
../../.././libsanitizer/asan/asan_interceptors.cc:183
#1 0x7fb46cd61632 in uv_thread_create 3rdparty/libuv/src/unix/thread.c:66
#2 0x7fb46ca97b1b in MVM_thread_run src/core/threads.c:129
#3 0x7fb46ca3b0a1 in MVM_interp_run src/core/interp.c:3964
#4 0x7fb46ccf5bf4 in MVM_vm_run_file src/moar.c:304
#5 0x401a4f in main src/main.c:191
#6 0x7fb46c20bd1c in __libc_start_main (/lib64/libc.so.6+0x1ed1c)
Thread T1 created by T0 here:
#0 0x7fb46d6206ea in __interceptor_pthread_create
../../.././libsanitizer/asan/asan_interceptors.cc:183
#1 0x7fb46cd61632 in uv_thread_create 3rdparty/libuv/src/unix/thread.c:66
#2 0x7fb46ca97b1b in MVM_thread_run src/core/threads.c:129
#3 0x7fb46ca3b0a1 in MVM_interp_run src/core/interp.c:3964
#4 0x7fb46ccf5bf4 in MVM_vm_run_file src/moar.c:304
#5 0x401a4f in main src/main.c:191
#6 0x7fb46c20bd1c in __libc_start_main (/lib64/libc.so.6+0x1ed1c)
SUMMARY: AddressSanitizer: double-free
../../.././libsanitizer/asan/asan_malloc_linux.cc:62 __interceptor_free
==9674==ABORTING
Nicholas Clark
