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0e7457e501
Wikipedia's list of common misspellings [1] has a machine-readable version. This patch fixes those misspellings mentioned in the list which don't have multiple right variants (as e.g. "accension", which can be both "accession" and "ascension"), such misspellings are left untouched. The list of changes was manually re-checked for false positives. [1] https://en.wikipedia.org/wiki/Wikipedia:Lists_of_common_misspellings/For_machines Signed-off-by: Martin Kletzander <mkletzan@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 daemon/libvirtd -d daemon/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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