root@:~ # uname -a FreeBSD 13.0-CURRENT FreeBSD 13.0-CURRENT #0 r357694: Sun Feb 9 12:40:40 UTC 2020 root@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@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
A commit references this bug: Author: lwhsu Date: Tue Feb 11 22:21:22 UTC 2020 New revision: 357780 URL: https://svnweb.freebsd.org/changeset/base/357780 Log: Temporarily skip sys.geom.class.multipath.failloop.failloop in CI This case uses `dtrace -c` but it has some issues at the moment PR: 244053 Sponsored by: The FreeBSD Foundation Changes: head/tests/sys/geom/class/multipath/failloop.sh
I can't reproduce this failure locally at r360076M. Was it fixed, or is this crash only reproducible in the CI environment?
(In reply to Alan Somers from comment #2) From bisect in artifact, this is fixed somewhere between (r358152, r358178]
A commit references this bug: Author: lwhsu Date: Mon May 18 23:43:48 UTC 2020 New revision: 361229 URL: https://svnweb.freebsd.org/changeset/base/361229 Log: Revert 357780, `dtrace -c` has been fixed in head` PR: 244053 Sponsored by: The FreeBSD Foundation Changes: head/tests/sys/geom/class/multipath/failloop.sh
I suspect this is fixed by r360979. The bug was exposed by an LLVM update I believe. Please re-open if it is reproducible with that revision.