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https://gitlab.com/libvirt/libvirt.git
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cfdc0c771a
The most important part is LIBVIRTD_PATH env var fix. It is used in virFileFindResourceFull() from tests. The libvirtd no longer lives under daemon/. Then, libvirtd-fail test was still failing (as expected) but not because of missing config file but because it was trying to execute (nonexistent) top_builddir/daemon/libvirtd which fulfilled expected outcome and thus test did not fail. Thirdly, lcov was told to generate coverage for daemon/ dir too. Fourthly, our compiling documentation was still suggesting to run daemonn/libvirtd. And finally, some comments in a systemtap file and a probes file were still referring to daemon/libvirtd. Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
119 lines
2.7 KiB
Plaintext
119 lines
2.7 KiB
Plaintext
#!/usr/bin/stap --ldd -d /usr/sbin/libvirtd -c libvirtd
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#
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# Usage with installed libvirt daemon:
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# stap --ldd -d /usr/sbin/libvirtd -c libvirtd \
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# lock-debug.stp /usr/lib/libvirt.so
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#
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# If made executable; simple './lock-debug.stp' should work too.
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#
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# TODOs:
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#
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# Document usage with uninstalled daemon and libs. Assuming CWD is toplevel
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# source git directory, it should be only slight modification to the following:
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#
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# ./run stap --ldd -c src/libvirtd -d src/libvirtd
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# examples/systemtap/lock-debug.stp src/.libs/libvirt.so
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#
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# Debug RWLock mechanisms as well.
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#
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# Author: Martin Kletzander <mkletzan@redhat.com>
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global mx_tolock
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global mx_locked
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function filter()
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{
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if (pid() != target())
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return 1
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return 0
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}
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probe library = process( %( $# > 0 %? @1 %: "/usr/lib/libvirt.so" %) )
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{
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if (filter()) next
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}
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probe lock = library.function("virMutexLock")
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{
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lockname = usymdata($m)
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}
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probe unlock = library.function("virMutexUnlock")
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{
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lockname = usymdata($m)
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}
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probe begin
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{
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%( $# > 1 %? println("error: Too many parameters"); exit();
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%: print("Started, press ^C when the process hangs\n"); %)
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}
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probe lock.call
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{
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mx_tolock[lockname, tid()] = sprint_usyms(ubacktrace())
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}
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probe lock.return
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{
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if ([lockname, tid()] in mx_tolock) {
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mx_locked[lockname, tid()] = mx_tolock[lockname, tid()]
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delete mx_tolock[lockname, tid()]
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} else {
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printf("internal error: lock acquired unwillingly?\n")
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}
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}
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probe unlock.call
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{
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found = 0
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foreach ([lock, tid] in mx_locked) {
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if (lock != lockname)
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continue
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if (tid != tid()) {
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printf("Warning: lock released on different thread that locked it.\n")
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printf("Lock trace:\n%s\n", mx_locked[lock, tid])
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printf("Unlock trace:\n%s\n", sprint_usyms(ubacktrace()))
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}
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found = tid
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break
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}
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if (found && [lockname, found] in mx_locked)
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delete mx_locked[lockname, found]
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}
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probe end
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{
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tmp = 0
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printf("\n=============\n")
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foreach (bt1 = [lock1, tid1] in mx_tolock) {
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deadlock = 0
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foreach (bt2 = [lock2, tid2] in mx_tolock) {
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if (lock1 == lock2) {
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if (!tmp++)
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printf("The following locks cannot be acquired:\n")
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if (!deadlock++)
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printf("Lock %s was locked in thread %d with this trace:\n%s\n",
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lock1, tid1, bt1)
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printf("and is waiting to be locked by thread %d here:\n%s\n",
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tid2, bt2)
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}
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}
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if (deadlock)
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printf("---\n")
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}
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if (!tmp)
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printf("No deadlocks found, sorry.\n")
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}
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