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From: Philippe W. <phi...@sk...> - 2016-09-17 08:51:45
|
On Fri, 2016-09-16 at 22:34 -0500, Rich Coe wrote:
> I'm trying to run valgrind on linux-4.7.2 with gcc-6.2.1.
> gdb version is GNU gdb (GDB; openSUSE Tumbleweed) 7.11.1
>
> I think the issue is a race condition or something wrong with gdb, as the
> test hangs trying process gdbserver.
>
> The only way to get the test to progress is to kill the test process with -9.
>
> Any tips or suggestions for debugging the issue?
> Below is some data on the first hung test.
The stacktrace shows that Valgrind gdbserver is waiting from
some input from gdb, at the very beginning of execution.
In the list of processes, I however do not see any gdb running.
So, maybe you will see something wrong in the gdb output files
(You should have this in the files
gdbserver_tests/mcblocklistsearch.stdoutB.out
and stderrB.out).
Another thing to try is to run the test manually:
In a window, start the test prog as indicated in
mcblocklistsearch.vgtest
In another window, start gdb (args also in the vgtest)
And then give to gdb one by one the gdb commands that are in
the file mcblocklistsearch.stdinB.gdb
to investigate what/why/when something goes
wrong/blocks/hangs/crashes/...
See gdbserver_tests/README_DEVELOPERS for some background
info.
Hope this helps
Philippe
|
|
From: Rich C. <rc...@wi...> - 2016-09-17 03:49:37
|
I'm trying to run valgrind on linux-4.7.2 with gcc-6.2.1. gdb version is GNU gdb (GDB; openSUSE Tumbleweed) 7.11.1 I think the issue is a race condition or something wrong with gdb, as the test hangs trying process gdbserver. The only way to get the test to progress is to kill the test process with -9. Any tips or suggestions for debugging the issue? Below is some data on the first hung test. Thanks. # running test output mcblocklistsearch: valgrind --tool=memcheck --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-mcblocklistsearch -q ./../memcheck/tests/leak-tree (progB: ./gdb --quiet -l 60 --nx 1>&2 ../memcheck/tests/leak-tree) # gdb attached current process where #0 0x000000003809cc19 in do_syscall_WRK () #1 0x000000003809cd0d in vgPlain_do_syscall (sysno=sysno@entry=7, a1=a1@entry=955970576, a2=a2@entry=1, a3=a3@entry=18446744073709551615, a4=a4@entry=0, a5=a5@entry=0, a6=0, a7=0, a8=0) at m_syscall.c:956 #2 0x0000000038084fd3 in vgPlain_poll (fds=fds@entry=0x38faf410 <remote_desc_pollfdread_activity>, nfds=nfds@entry=1, timeout=timeout@entry=-1) at m_libcfile.c:623 #3 0x00000000380cd206 in vgPlain_poll_no_eintr (fds=fds@entry=0x38faf410 <remote_desc_pollfdread_activity>, nfds=nfds@entry=1, timeout=timeout@entry=-1) at m_gdbserver/remote-utils.c:86 #4 0x00000000380cdf20 in readchar (single=0) at m_gdbserver/remote-utils.c:958 #5 0x00000000380ce85b in getpkt (buf=0x80237c150 "") at m_gdbserver/remote-utils.c:1017 #6 0x00000000380cfeb7 in server_main () at m_gdbserver/server.c:1214 #7 0x00000000380cb02c in call_gdbserver (tid=1, reason=reason@entry=core_reason) at m_gdbserver/m_gdbserver.c:721 #8 0x00000000380cbd12 in vgPlain_gdbserver (tid=<optimized out>) at m_gdbserver/m_gdbserver.c:788 #9 0x00000000380d77dc in vgPlain_scheduler (tid=tid@entry=1) at m_scheduler/scheduler.c:1240 #10 0x00000000380e7267 in thread_wrapper (tidW=1) at m_syswrap/syswrap-linux.c:103 #11 run_a_thread_NORETURN (tidW=1) at m_syswrap/syswrap-linux.c:156 #12 0x0000000000000000 in ?? () (gdb) info thr Id Target Id Frame * 1 process 32279 "memcheck-amd64-" 0x000000003809cc19 in do_syscall_WRK () # process list for test processes UID PID PPID C STIME TTY TIME CMD coe 21990 22187 0 22:08 pts/21 00:00:00 make regtest coe 31592 21990 0 22:09 pts/21 00:00:00 /bin/sh -c if /usr/bin/perl tests/vg_regtest gdbserver_tests memcheck cachegrind callgrind massif lackey none helgrind drd exp-sgcheck exp-bbv exp-dhat ; then \ tests/post_regtest_checks /usr/local/ext/src/vg/vg.git gdbserver_tests memcheck cachegrind callgrind massif lackey none helgrind drd exp-sgcheck exp-bbv exp-dhat; \ else \ tests/post_regtest_checks /usr/local/ext/src/vg/vg.git gdbserver_tests memcheck cachegrind callgrind massif lackey none helgrind drd exp-sgcheck exp-bbv exp-dhat; \ false; \ fi coe 31593 31592 0 22:09 pts/21 00:00:00 /usr/bin/perl tests/vg_regtest gdbserver_tests memcheck cachegrind callgrind massif lackey none helgrind drd exp-sgcheck exp-bbv exp-dhat coe 32277 31593 0 22:09 pts/21 00:00:00 sh -c VALGRIND_LIB=/usr/local/ext/src/vg/vg.git/.in_place VALGRIND_LIB_INNER=/usr/local/ext/src/vg/vg.git/.in_place /usr/local/ext/src/vg/vg.git/./coregrind/valgrind --command-line-only=yes --memcheck:leak-check=no --tool=mcblocklistsearch --tool=memcheck --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-mcblocklistsearch -q ./../memcheck/tests/leak-tree > mcblocklistsearch.stdout.out 2> mcblocklistsearch.stderr.out coe 32279 32277 0 22:09 pts/21 00:00:00 /usr/local/ext/src/vg/vg.git/./coregrind/valgrind --command-line-only=yes --memcheck:leak-check=no --tool=mcblocklistsearch --tool=memcheck --vgdb=yes --vgdb-error=0 --vgdb-prefix=./vgdb-prefix-mcblocklistsearch -q ./../memcheck/tests/leak-tree -- Rich Coe rc...@wi... |