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FatalSignalHandler: print some more information from siginfo_t

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The siginfo_t parameter allows us to show what process sent a signal or
the crashing address. Additionally, it allows us to determine if the
crashing signal was indeed sent due to a crash.

The selftest tst_crashes produces now:

$ QTEST_DISABLE_STACK_DUMP=1 ./crashes
********* Start testing of tst_Crashes *********
Config: Using QtTest library 6.4.0, Qt 6.4.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by GCC 11.2.1 20220420 [revision 691af15031e00227ba6d5935c1d737026cda4129]), opensuse-tumbleweed 20220428
PASS   : tst_Crashes::initTestCase()
Received signal 11 (SIGSEGV), code 1, for address 0x0000000000000004
         Function time: 0ms, total time: 0ms
[1]    201995 segmentation fault (core dumped)  QTEST_DISABLE_STACK_DUMP=1 ./crashes

The last line comes from the shell. The code isn't decoded, but on Linux
it's a SEGV_MAPERR. macOS prints exactly the same thing.

I've updated one of the expected_crashes_*.txt output that doesn't seem
possible (the "Received a fatal error" message does not appear in Qt
anywhere).

Pick-to: 6.4
Change-Id: I5ff8e16fcdcb4ffd9ab6fffd16ebc8391234f0e2
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
This commit is contained in:
Thiago Macieira 2022-05-03 20:05:49 -07:00
parent 68a1f9582b
commit 5e67e7efaa
2 changed files with 41 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

45
src/testlib/qtestcase.cpp
View File

@ -2074,12 +2074,48 @@ private:
# endif
}
static void actionHandler(int signum, siginfo_t * /* info */, void * /* ucontext */)
template <typename T> static
std::enable_if_t<sizeof(std::declval<T>().si_pid) + sizeof(std::declval<T>().si_uid) >= 1>
printSentSignalInfo(T *info)
{
writeToStderr(" sent by PID ", asyncSafeToString(info->si_pid),
" UID ", asyncSafeToString(info->si_uid));
}
static void printSentSignalInfo(...) {}
template <typename T> static
std::enable_if_t<sizeof(std::declval<T>().si_addr) >= 1> printCrashingSignalInfo(T *info)
{
using HexString = std::array<char, sizeof(quintptr) * 2>;
auto toHexString = [](quintptr u, HexString &&r = {}) {
int shift = sizeof(quintptr) * 8 - 4;
for (size_t i = 0; i < sizeof(quintptr) * 2; ++i, shift -= 4)
r[i] = QtMiscUtils::toHexLower(u >> shift);
struct iovec vec;
vec.iov_base = r.data();
vec.iov_len = r.size();
return vec;
};
writeToStderr(", code ", asyncSafeToString(info->si_code),
", for address 0x", toHexString(quintptr(info->si_addr)));
}
static void printCrashingSignalInfo(...) {}
static void actionHandler(int signum, siginfo_t *info, void * /* ucontext */)
{
writeToStderr("Received signal ", asyncSafeToString(signum),
" (SIG", signalName(signum), ")\n");
printTestRunTime();
" (SIG", signalName(signum), ")");
bool isCrashingSignal =
std::find(crashingSignals.begin(), crashingSignals.end(), signum) != crashingSignals.end();
if (isCrashingSignal && (!info || info->si_code <= 0))
isCrashingSignal = false; // wasn't sent by the kernel, so it's not really a crash
if (isCrashingSignal)
printCrashingSignalInfo(info);
else if (info && (info->si_code == SI_USER || info->si_code == SI_QUEUE))
printSentSignalInfo(info);
printTestRunTime();
if (signum != SIGINT) {
generateStackTrace();
if (pauseOnCrash) {
@ -2089,9 +2125,6 @@ private:
}
}
bool isCrashingSignal =
std::find(crashingSignals.begin(), crashingSignals.end(), signum) != crashingSignals.end();
// chain back to the previous handler, if any
for (size_t i = 0; i < fatalSignals.size(); ++i) {
struct sigaction &act = oldActions()[i];

7
tests/auto/testlib/selftests/expected_crashes_3.txt
View File

@ -1,8 +1,5 @@
********* Start testing of tst_Crashes *********
Config: Using QtTest library @INSERT_QT_VERSION_HERE@, Qt @INSERT_QT_VERSION_HERE@
PASS : tst_Crashes::initTestCase()
QFATAL : tst_Crashes::crash() Received signal 11
Function time: ms Total time: ms
FAIL! : tst_Crashes::crash() Received a fatal error.
Totals: 1 passed, 1 failed, 0 skipped, 0 blacklisted
********* Finished testing of tst_Crashes *********
Received signal 11 (SIGSEGV), code 1, for address 0x0000000000000004
Function time: ms, total time: ms