diff options
author | Thiago Macieira <thiago.macieira@intel.com> | 2022-05-03 20:05:49 -0700 |
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committer | Thiago Macieira <thiago.macieira@intel.com> | 2022-06-28 00:39:35 +0000 |
commit | 5e67e7efaa2669252fd8c55392b7bc35b72c6079 (patch) | |
tree | 3009e897ea69d3cf774e21fcb761c2bb846e915b /src/testlib/qtestcase.cpp | |
parent | 68a1f9582b38b30add7c061caae1fd8acb356da9 (diff) |
FatalSignalHandler: print some more information from siginfo_t
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>
Diffstat (limited to 'src/testlib/qtestcase.cpp')
-rw-r--r-- | src/testlib/qtestcase.cpp | 45 |
1 files changed, 39 insertions, 6 deletions
diff --git a/src/testlib/qtestcase.cpp b/src/testlib/qtestcase.cpp index 6b5584366d..f55d4ba38f 100644 --- a/src/testlib/qtestcase.cpp +++ b/src/testlib/qtestcase.cpp @@ -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]; |