As per

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As per <https kotlinlang slack com archives C0A974TJ9 p1654555064089159> We encountered similar problems too We have included Ktor lib in our KMM project however we don t invoke any Ktor related call in our iOS project App crashed due to `Strings kt line 296` `EXC BAD ACCESS KERN INVALID ADDRESS 0x0000000000000000` We drilled down the logs on crashlytics a bit and found that the app crashed during when our class `AnalyticsTracker` was initializing However `AnalyticsTracker` didn t contain any Ktor related code we are only accessing some constants defined in KMM And what we found interesting is that we found stacktrace for `com apple main thread` comes in with a little bit variation You may check the attached stacktrace Kotlin version 1 5 31 Ktor version 1 6 0 `Stacktrace for Thread 1` ```Crashed Thread 0 9Gag 0x55f634 kfun kotlinx cinterop lt get cstr gt at kotlin String kotlinx cinterop CValues lt kotlinx cinterop ByteVarOf lt kotlin Byte gt gt + 296 Strings kt 296 1 9Gag 0x6e595c kfun io ktor utils io charsets CharsetImpl lt init gt internal + 26 CharsetNative kt 26 2 9Gag 0x6e5788 kfun io ktor utils io charsets Charsets lt init gt + 383 CharsetNative kt 383 3 9Gag 0xa698ec InitSingletonStrict + 4325644524 4 9Gag 0x947104 unnamed 2910 + 4324454660 5 9Gag 0xa74630 Kotlin initRuntimeIfNeeded + 4325688880 6 9Gag 0xa7698c anonymous namespace workerRoutine void + 4325697932 7 0x18251c2c0 Missing 8 0x18251c220 Missing 9 0x18251fcdc Missing ```

Raymond Chan · Answer

We also see another crash related to `DefaultPool kt` `Stacktrace for Thread 1` `EXC BAD ACCESS KERN INVALID ADDRESS 0x0000000000000008` ```Crashed Thread 0 9Gag 0x6ef6b0 kfun io ktor utils io pool DefaultPool lt get size gt internal + 13 DefaultPool kt 13 1 9Gag 0x6efa80 kfun io ktor utils io pool DefaultPool borrow 1 0 + 22 DefaultPool kt 22 2 9Gag 0x6d7578 kfun io ktor utils io core internal ChunkBuffer Companion object 1 borrow internal + 136 ChunkBuffer kt 136 3 9Gag 0x6e6dc8 kfun io ktor utils io charsets encodeToByteArray at io ktor utils io charsets CharsetEncoder kotlin CharSequence kotlin Int kotlin Int kotlin ByteArray + 147 Encoding kt 147 4 9Gag 0x947134 unnamed 2910 + 4310872372 5 9Gag 0xa74630 Kotlin initRuntimeIfNeeded + 4312106544 6 9Gag 0xa7698c anonymous namespace workerRoutine void + 4312115596 7 0x18649d2c0 Missing 8 0x18649d220 Missing 9 0x1864a0cdc Missing ``` `com apple main thread` ```com apple main thread 0 9Gag 0x5f0344 kfun kotlin collections putAll at kotlin collections MutableMap lt in|0 0 in|0 1 gt kotlin Array lt out|kotlin Pair lt 0 0 0 1 gt gt 0 lt kotlin Any gt 1 lt kotlin Any gt + 4320953156 Maps kt 4320953156 1 9Gag 0x9399ac unnamed 2910 + 4324399532 2 9Gag 0xa7460c Kotlin initRuntimeIfNeeded + 4325688844 3 9Gag 0xa649a4 + KotlinBase allocWithZone + 4325624228 4 9Gag 0x1ae838 AnalyticsTracker init + 4316489784 lt compiler generated gt 4316489784 5 9Gag 0x1ae63c one time initialization function for shared + 28 AnalyticsTracker swift 28 6 0x18233c7d4 Missing 7 0x1822dfeb8 Missing 8 0x1b0139e40 Missing 9 9Gag 0xbaa0c specialized MixpanelApplictionService application didFinishLaunchingWithOptions + 28 AnalyticsTracker swift 28 10 9Gag 0xba7e4 objc MixpanelApplictionService application didFinishLaunchingWithOptions + 4315490276 lt compiler generated gt 4315490276 11 0x10459a51c Missing 12 9Gag 0x88d4c AppDelegate application didFinishLaunchingWithOptions + 51 AppDelegate swift 51 13 9Gag 0x890d0 objc AppDelegate application didFinishLaunchingWithOptions + 4315287760 lt compiler generated gt 4315287760 14 0x1aed4a0f0 Missing 15 0x1aed4b854 Missing 16 0x1aed50fe0 Missing 17 0x1ae6142a4 Missing 18 0x1ae61c83c Missing 19 0x1ae613f28 Missing 20 0x1ae614818 Missing 21 0x1ae612b64 Missing 22 0x1ae61282c Missing 23 0x1ae61736c Missing 24 0x1ae618150 Missing 25 0x1ae617224 Missing 26 0x1ae61bf24 Missing 27 0x1aed4f5e8 Missing 28 0x1ae94be04 Missing 29 0x18527b9fc Missing 30 0x18528540c Missing 31 0x185284c14 Missing 32 0x18233c7d4 Missing 33 0x1822e15dc Missing 34 0x1852b6040 Missing 35 0x1852b5cdc Missing 36 0x1852b6294 Missing 37 0x18288ff1c Missing 38 0x18288fe9c Missing 39 0x18288f784 Missing 40 0x18288a6c0 Missing 41 0x182889fb4 Missing 42 0x184a8c79c Missing 43 0x1aed52c38 Missing 44 9Gag 0x12e50 main + 13 main swift 13 ```

Raymond Chan · Answer

`Strings kt` crash mostly related to iOS 12 while `DefaultPool kt` crash mostly related to iOS 15

Aleksei Tirman [JB] · Answer

Could you please <https youtrack jetbrains com newIssue project=KT|file an issue> with a sample project for reproduction attached