Isolate compute crash when TextPaint layout #22478
Description
Steps to Reproduce
// compute page
List<IsolatePage> isolatePageList = await compute(IsolatePageParse.parseIsolatePages, IsolatePageParse.PageParserArgs(widget.content, pageWidth, pageHeight));
when has the compute function has the code below will crash:
textPainter.text = TextSpan(text: "中", style: TextStyle(fontSize: FONT_SIZE, height: FONT_HEIGHT));
textPainter.layout(maxWidth: contentWidth); // this line cause the crash
Logs
Syncing files to device Android SDK built for x86...
I/flutter ( 6932): build page width: 384.0
D/ ( 6932): HostConnection::get() New Host Connection established 0xdf15eb00, tid 6951
D/EGL_emulation( 6932): eglMakeCurrent: 0xdf75d860: ver 2 0 (tinfo 0xde4aeba0)
F/libc ( 6932): Fatal signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0 in tid 6964 (rtxtviewexample), pid 6932 (rtxtviewexample)
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'google/sdk_gphone_x86/generic_x86:9/PSR1.180720.012/4923214:userdebug/dev-keys'
Revision: '0'
ABI: 'x86'
pid: 6932, tid: 6964, name: rtxtviewexample >>> com.jayfeng.txtview.fluttertxtviewexample <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
Cause: null pointer dereference
eax 00000000 ebx cc921f84 ecx 00000001 edx be9bf970
edi 00000186 esi be9beb48
ebp be9beab8 esp be9be9d0 eip cbf1d601
backtrace:
#00 pc 006da601 /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#01 pc 006da44e /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#02 pc 006dae16 /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#03 pc 006da2b7 /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#04 pc 00ca74ed /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#05 pc 00ca7353 /data/app/com.jayfeng.txtview.fluttertxtviewexample-VEamvLU0tyO3_Hcv2-uCgA==/lib/x86/libflutter.so (offset 0x697000)
#06 pc 000007d6 <anonymous:ca400000>
Lost connection to device.
[✓] Flutter (Channel beta, v0.8.2, on Linux, locale en_US.UTF-8)
• Flutter version 0.8.2 at /home/jay/tools/flutter
• Framework revision 5ab9e70727 (3 weeks ago), 2018-09-07 12:33:05 -0700
• Engine revision 58a1894a1c
• Dart version 2.1.0-dev.3.1.flutter-760a9690c2