Please help to understand the below crash better
Incident Identifier: 2420C89E-A8C9-4E23-BBEA-FE3995C57495
Hardware Model: iPhone12,8
Process: PacketTunnelProvider [3824]
Path: /private/var/containers/Bundle/Application/636BECFF-E199-48A0-A3F3-3AC9BA735CE0/masked masked for Endpoint.app/PlugIns/PacketTunnelProvider.appex/PacketTunnelProvider
Identifier: com.masked.masked_company.tunnel
Version: 1.1.38010102 (1.1.38010102)
Code Type: ARM-64 (Native)
Role: Unspecified
Parent Process: launchd [1]
Coalition: com.masked.masked_company.tunnel [835]
Date/Time: 2023-02-06 18:28:41.8259 +0100
Launch Time: 2023-02-06 18:28:41.4521 +0100
OS Version: iPhone OS 14.3 (18C66)
Release Type: User
Baseband Version: 2.03.04
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000038
VM Region Info: 0x38 is not in any region. Bytes before following region: 4302618568
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 10074c000-100750000 [ 16K] r-x/r-x SM=COW ...unnelProvider
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [3824]
Triggered by Thread: 3
Thread 3 name:
Thread 3 Crashed:
0 SharedFramework 0x0000000100810364 details::purge_cache() + 72 (AppConnectionInfo.mm:31)
1 SharedFramework 0x0000000100810334 details::current_time() + 4 (AppConnectionInfo.mm:21)
2 SharedFramework 0x0000000100810334 details::purge_cache() + 24 (AppConnectionInfo.mm:28)
3 SharedFramework 0x000000010081515c __60-[GCDTimer initWithInterval:repeat:leeway:queue:completion:]_block_invoke + 28 (GCDTimer.m:31)
4 libdispatch.dylib 0x0000000186e84db0 _dispatch_client_callout + 20 (object.m:559)
5 libdispatch.dylib 0x0000000186e8812c _dispatch_continuation_pop + 416 (inline_internal.h:2548)
6 libdispatch.dylib 0x0000000186e99c08 _dispatch_source_invoke + 1260 (source.c:570)
7 libdispatch.dylib 0x0000000186e8bfd8 _dispatch_lane_serial_drain + 272 (inline_internal.h:2589)
8 libdispatch.dylib 0x0000000186e8cc5c _dispatch_lane_invoke + 408 (queue.c:3862)
9 libdispatch.dylib 0x0000000186e96d78 _dispatch_workloop_worker_thread + 708 (queue.c:6601)
10 libsystem_pthread.dylib 0x00000001d2adb804 _pthread_wqthread + 276 (pthread.c:2207)
11 libsystem_pthread.dylib 0x00000001d2ae275c start_wqthread + 8 (:-1)
Relevant code block for the same
const auto now = std::chrono::system_clock::now();
const auto msecs = std::chrono::duration_cast<std::chrono::microseconds>(now.time_since_epoch()).count();
return msecs;
}
void purge_cache() {
// TODO : check for the more optimisations here.
auto now = current_time();
// TODO : 31045550 : add an aggregated telemetry of cache size here, this requires changes in TelemetryAggregator
for (auto it = _cache.begin(); it != _cache.end();) {
if (now - it->second.first > CONNECTION_TIMEOUT) {
// if last timestamp of connection is greater than 10 seconds, then it would mean there is no outgoing packet from the socket for more than 10 seconds
_cache.erase(it++);
} else {
++it;
}
}
}
Crash is happening here if (now - it->second.first > CONNECTION_TIMEOUT).
This is happening for iOS devices less than 15.0
