Evgeny Vereshchagin
8af35ba681
Fixes:
```
touch hola.service
systemctl link $(pwd)/hola.service $(pwd)/hola.service
```
```
==1==ERROR: AddressSanitizer: attempting double-free on 0x60300002c560 in thread T0 (systemd):
#0 0x7fc8c961cb00 in free (/lib64/libasan.so.3+0xc6b00)
#1 0x7fc8c90ebd3b in strv_clear src/basic/strv.c:83
#2 0x7fc8c90ebdb6 in strv_free src/basic/strv.c:89
#3 0x55637c758c77 in strv_freep src/basic/strv.h:37
#4 0x55637c763ba9 in method_enable_unit_files_generic src/core/dbus-manager.c:1960
#5 0x55637c763d16 in method_link_unit_files src/core/dbus-manager.c:2001
#6 0x7fc8c92537ec in method_callbacks_run src/libsystemd/sd-bus/bus-objects.c:418
#7 0x7fc8c9258830 in object_find_and_run src/libsystemd/sd-bus/bus-objects.c:1255
#8 0x7fc8c92594d7 in bus_process_object src/libsystemd/sd-bus/bus-objects.c:1371
#9 0x7fc8c91e7553 in process_message src/libsystemd/sd-bus/sd-bus.c:2563
#10 0x7fc8c91e78ce in process_running src/libsystemd/sd-bus/sd-bus.c:2605
#11 0x7fc8c91e8f61 in bus_process_internal src/libsystemd/sd-bus/sd-bus.c:2837
#12 0x7fc8c91e90d2 in sd_bus_process src/libsystemd/sd-bus/sd-bus.c:2856
#13 0x7fc8c91ea8f9 in io_callback src/libsystemd/sd-bus/sd-bus.c:3126
#14 0x7fc8c928333b in source_dispatch src/libsystemd/sd-event/sd-event.c:2268
#15 0x7fc8c9285cf7 in sd_event_dispatch src/libsystemd/sd-event/sd-event.c:2627
#16 0x7fc8c92865fa in sd_event_run src/libsystemd/sd-event/sd-event.c:2686
#17 0x55637c6b5257 in manager_loop src/core/manager.c:2274
#18 0x55637c6a2194 in main src/core/main.c:1920
#19 0x7fc8c7ac7400 in __libc_start_main (/lib64/libc.so.6+0x20400)
#20 0x55637c697339 in _start (/usr/lib/systemd/systemd+0xcd339)
0x60300002c560 is located 0 bytes inside of 19-byte region [0x60300002c560,0x60300002c573)
freed by thread T0 (systemd) here:
#0 0x7fc8c961cb00 in free (/lib64/libasan.so.3+0xc6b00)
#1 0x7fc8c90ee320 in strv_remove src/basic/strv.c:630
#2 0x7fc8c90ee190 in strv_uniq src/basic/strv.c:602
#3 0x7fc8c9180533 in unit_file_link src/shared/install.c:1996
#4 0x55637c763b25 in method_enable_unit_files_generic src/core/dbus-manager.c:1985
#5 0x55637c763d16 in method_link_unit_files src/core/dbus-manager.c:2001
#6 0x7fc8c92537ec in method_callbacks_run src/libsystemd/sd-bus/bus-objects.c:418
#7 0x7fc8c9258830 in object_find_and_run src/libsystemd/sd-bus/bus-objects.c:1255
#8 0x7fc8c92594d7 in bus_process_object src/libsystemd/sd-bus/bus-objects.c:1371
#9 0x7fc8c91e7553 in process_message src/libsystemd/sd-bus/sd-bus.c:2563
#10 0x7fc8c91e78ce in process_running src/libsystemd/sd-bus/sd-bus.c:2605
#11 0x7fc8c91e8f61 in bus_process_internal src/libsystemd/sd-bus/sd-bus.c:2837
#12 0x7fc8c91e90d2 in sd_bus_process src/libsystemd/sd-bus/sd-bus.c:2856
#13 0x7fc8c91ea8f9 in io_callback src/libsystemd/sd-bus/sd-bus.c:3126
#14 0x7fc8c928333b in source_dispatch src/libsystemd/sd-event/sd-event.c:2268
#15 0x7fc8c9285cf7 in sd_event_dispatch src/libsystemd/sd-event/sd-event.c:2627
#16 0x7fc8c92865fa in sd_event_run src/libsystemd/sd-event/sd-event.c:2686
#17 0x55637c6b5257 in manager_loop src/core/manager.c:2274
#18 0x55637c6a2194 in main src/core/main.c:1920
#19 0x7fc8c7ac7400 in __libc_start_main (/lib64/libc.so.6+0x20400)
previously allocated by thread T0 (systemd) here:
#0 0x7fc8c95b0160 in strdup (/lib64/libasan.so.3+0x5a160)
#1 0x7fc8c90edf32 in strv_extend src/basic/strv.c:552
#2 0x7fc8c923ae41 in bus_message_read_strv_extend src/libsystemd/sd-bus/bus-message.c:5578
#3 0x7fc8c923b0de in sd_bus_message_read_strv src/libsystemd/sd-bus/bus-message.c:5600
#4 0x55637c7639d1 in method_enable_unit_files_generic src/core/dbus-manager.c:1969
#5 0x55637c763d16 in method_link_unit_files src/core/dbus-manager.c:2001
#6 0x7fc8c92537ec in method_callbacks_run src/libsystemd/sd-bus/bus-objects.c:418
#7 0x7fc8c9258830 in object_find_and_run src/libsystemd/sd-bus/bus-objects.c:1255
#8 0x7fc8c92594d7 in bus_process_object src/libsystemd/sd-bus/bus-objects.c:1371
#9 0x7fc8c91e7553 in process_message src/libsystemd/sd-bus/sd-bus.c:2563
#10 0x7fc8c91e78ce in process_running src/libsystemd/sd-bus/sd-bus.c:2605
#11 0x7fc8c91e8f61 in bus_process_internal src/libsystemd/sd-bus/sd-bus.c:2837
#12 0x7fc8c91e90d2 in sd_bus_process src/libsystemd/sd-bus/sd-bus.c:2856
#13 0x7fc8c91ea8f9 in io_callback src/libsystemd/sd-bus/sd-bus.c:3126
#14 0x7fc8c928333b in source_dispatch src/libsystemd/sd-event/sd-event.c:2268
#15 0x7fc8c9285cf7 in sd_event_dispatch src/libsystemd/sd-event/sd-event.c:2627
#16 0x7fc8c92865fa in sd_event_run src/libsystemd/sd-event/sd-event.c:2686
#17 0x55637c6b5257 in manager_loop src/core/manager.c:2274
#18 0x55637c6a2194 in main src/core/main.c:1920
#19 0x7fc8c7ac7400 in __libc_start_main (/lib64/libc.so.6+0x20400)
SUMMARY: AddressSanitizer: double-free (/lib64/libasan.so.3+0xc6b00) in free
==1==ABORTING
```
Closes #5015
systemd - System and Service Manager
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