https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248745
Bug ID: 248745
Summary: /usr/bin/lldb dumps core when attempting to print
variable with `p`, `fr v` works
Product: Base System
Version: 12.1-STABLE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: b...@freebsd.org
Reporter: d...@freebsd.org
$ uname -v
FreeBSD 12.1-STABLE r364355
$ /usr/bin/lldb -v
lldb version 10.0.1 (g...@github.com:llvm/llvm-project.git revision
llvmorg-10.0.1-0-gef32c611aa2)
clang revision llvmorg-10.0.1-0-gef32c611aa2
llvm revision llvmorg-10.0.1-0-gef32c611aa2
$ cat <<EOD > testcase.c
int main(int argc, char *argv[])
{
return 0;
}
EOD
$ cc -O0 -g testcase.c
$ /usr/bin/lldb a.out
...
(lldb) b main
Breakpoint 1: where = a.out`main + 20 at testcase.c:5:5, address =
0x00000000002018d4
(lldb) r
Process 27744 launching
Process 27744 launched: '/home/dg/tmp/a.out' (x86_64)
Process 27744 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000002018d4 a.out`main(argc=1, argv=0x00007fffffffe480) at
testcase.c:5:5
2
3 int main(int argc, char *argv[])
4 {
-> 5 return 0;
6 }
(lldb) p argc
Program aborted due to an unhandled Error:
Error value was Success. (Note: Success values must still be checked prior to
being destroyed).
Stack dump:
0. Program arguments: /usr/bin/lldb a.out
1. HandleCommand(command = "p argc")
#0 0x0000000003b848de PrintStackTrace
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:564:13
#1 0x0000000003b82b37 RunSignalHandlers
/usr/src/contrib/llvm-project/llvm/lib/Support/Signals.cpp:69:18
#2 0x0000000003b851d0 SignalHandler
/usr/src/contrib/llvm-project/llvm/lib/Support/Unix/Signals.inc:0:3
#3 0x000000080477dd22 handle_signal /usr/src/lib/libthr/thread/thr_sig.c:0:3
Abort trap (core dumped)
What's interesting is that `fr v` works fine:
...
(lldb) b main
Breakpoint 1: where = a.out`main + 20 at testcase.c:5:5, address =
0x00000000002018d4
(lldb) r
Process 28540 launching
Process 28540 launched: '/home/dg/tmp/a.out' (x86_64)
Process 28540 stopped
* thread #1, name = 'a.out', stop reason = breakpoint 1.1
frame #0: 0x00000000002018d4 a.out`main(argc=1, argv=0x00007fffffffe480) at
testcase.c:5:5
2
3 int main(int argc, char *argv[])
4 {
-> 5 return 0;
6 }
(lldb) fr v argc
(int) argc = 1
(lldb)
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