I'm doing testing of some software with valgrind. Ideally, I would like to have 20 or more instances of valgrind open at once. However, if I run more than 16 instances in parallel, I start getting messages like:
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_269e37a6
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_d6b675e7
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_db46c594
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_51cd683d
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_86662832
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_226a8983
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_bb94a700
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_532d4b39
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_de4a957e
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_fcc23adf
==30533== VG_(mkstemp): failed to create temp file: /tmp/valgrind_proc_30533_cmdline_f41d332c
valgrind: Startup or configuration error:
valgrind: Can't create client cmdline file in /pathtomyproject/
valgrind: Unable to start up properly. Giving up.
Some of the processes (perhaps 1/3 of them) instead terminate with the error
==30482== ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 2 from 2)
==30482==
==30482== 1 errors in context 1 of 1:
==30482== Jump to the invalid address stated on the next line
==30482== at 0x4C6: ???
==30482== by 0x4005D2E: open_verify (dl-load.c:1914)
==30482== by 0x4006362: open_path (dl-load.c:2175)
==30482== by 0x4008799: _dl_map_object (dl-load.c:2407)
==30482== by 0x400CFE1: openaux (dl-deps.c:65)
==30482== by 0x400F175: _dl_catch_error (dl-error.c:178)
==30482== by 0x400D6BD: _dl_map_object_deps (dl-deps.c:258)
==30482== by 0x400350C: dl_main (rtld.c:1826)
==30482== by 0x4015B23: _dl_sysdep_start (dl-sysdep.c:244)
==30482== by 0x4005364: _dl_start (rtld.c:338)
==30482== by 0x40016B7: ??? (in /lib/x86_64-linux-gnu/ld-2.15.so)
==30482== by 0x4: ???
==30482== by 0x7FF0007C6: ???
==30482== by 0x7FF0007DD: ???
==30482== by 0x7FF0007E2: ???
==30482== by 0x7FF0007E9: ???
==30482== by 0x7FF0007EE: ???
==30482== Address 0x4c6 is not stack'd, malloc'd or (recently) free'd
While running these calls, no files are created in /tmp, but the user account I'm using does have read, write and execute permissions for /tmp.
I cannot find any information about this bug online, but perhaps somewhere here knows something about it?
EDIT: Some further experimentation suggests that in fact, no more than 5 processes can be run together at once.
The error comes from here:
As you can see, that code will fail if there are more than 10 processes that share the same
pid
andppid
. It is not clear how you are creating the 20 valgrind processes -- they should normally not sharepid
.You might be able to work around the problem by either
pid
, orTMPDIR
to a different directory for each of the Valgrind instance.