https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=244053
Bug ID: 244053
Summary: `dtrace -c` causes program dumps core after somewhere
between (r357694, r357701]
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: bugs at FreeBSD.org
Reporter: lwhsu at FreeBSD.org
root@:~ # uname -a
FreeBSD 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r357694: Sun Feb 9 12:40:40 UTC
2020
root at FreeBSD-head-amd64-build.jail.ci.FreeBSD.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC
amd64
root@:~ # dtrace -n 'syscall:::entry { @[execname, probefunc] = count(); }' -c
"echo hello"
dtrace: description 'syscall:::entry ' matched 1130 probes
dtrace: buffer size lowered to 1m
dtrace: aggregation size lowered to 1m
hello
dtrace: pid 825 has exited
dtrace close
1
dtrace fstat
1
dtrace open
1
dtrace thr_exit
1
echo cap_enter
1
echo exit
1
echo mmap
1
echo mprotect
1
echo writev
1
dtrace _umtx_op
2
dtrace mmap
3
echo cap_fcntls_limit
3
echo cap_ioctls_limit
3
echo cap_rights_limit
3
dtrace wait4
4
dtrace __sysctl
5
dtrace write
6
echo sigprocmask
7
dtrace sigaction
10
dtrace __sysctlbyname
17
dtrace sigprocmask
20
dtrace ptrace
22
dtrace ioctl
41
root@:~ # uname -a
FreeBSD 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r357701: Sun Feb 9 13:32:35 UTC
2020
root at FreeBSD-head-amd64-build.jail.ci.FreeBSD.org:/usr/obj/usr/src/amd64.amd64/sys/GENERIC
amd64
root@:~ # dtrace -n 'syscall:::entry { @[execname, probefunc] = count(); }' -c
"echo hello"
dtrace: failed to control pid 800: process died from signal 11
root@:~ # dtrace -n 'syscall:::entry { @[execname, probefunc] = count(); }' -c
"ls /"
dtrace: failed to control pid 790: process died from signal 11
root@:~ # lldb /usr/lib/debug/bin/ls.debug -c ls.core
(lldb) target create "/usr/lib/debug/bin/ls.debug" --core "ls.core"
Core file '/root/ls.core' (x86_64) was loaded.
(lldb) bt
* thread #1, name = 'ls', stop reason = signal SIGSEGV
* frame #0: 0x0000000000000000
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