Here it is.
cont: 1
Fatal signal 11 (SIGSEGV), code 1, fault addr 0x0 in tid 8220 (.PDFRendererBug)
*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
Build fingerprint: 'Huawei/ALE-L21/hwALE-H:5.0.1/HuaweiALE-L21/C432B204:user/release-keys'
Revision: '0'
ABI: 'arm64'
pid: 8220, tid: 8220, name: .PDFRendererBug >>> b4a.PDFRendererBug <<<
signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 0x0
x0 0000000000000000 x1 0000005563575b50 x2 0000000000000f80 x3 0000000000000000
x4 0000000000000000 x5 00000000201c4001 x6 fffffffffffffff0 x7 80000e0000000100
x8 322f534f60000300 x9 68010000c095cba0 x10 70616d6360000000 x11 c40f0000cb460d30
x12 20747663d4020000 x13 201c0000724d9d44 x14 6d67706610020000 x15 0000000000001484
x16 0000007fb2c5e400 x17 0000007fb2bdae00 x18 0000005563575b20 x19 0000000000001000
x20 0000007fb2c66c20 x21 f11f590000000000 x22 0000000000000000 x23 0000000000000001
x24 f11f590000000000 x25 f11f590000000000 x26 0000000000000000 x27 0000007ff11f59d8
x28 0000007f9660a310 x29 0000007ff11f5810 x30 0000007fb2c13e44
sp 0000007ff11f5810 pc 0000007fb2bdaf14 pstate 0000000020000000
backtrace:
#00 pc 0000000000017f14 /system/lib64/libc.so (memcpy+276)
#01 pc 0000000000050e40 /system/lib64/libc.so (fread+176)
#02 pc 00000000001e728c /system/lib64/libpdfium.so (FPDFAPI_FT_Stream_ReadAt+80)
#03 pc 00000000001e5ed4 /system/lib64/libpdfium.so (FPDFAPI_FT_Load_Sfnt_Table+136)
#04 pc 0000000000241c88 /system/lib64/libpdfium.so (CFPF_SkiaFont::GetFontData(unsigned int, unsigned char*, unsigned int)+36)
#05 pc 000000000023f9d0 /system/lib64/libpdfium.so (CFX_AndroidFontInfo::GetFontData(void*, unsigned int, unsigned char*, unsigned int)+36)
#06 pc 0000000000197b4c /system/lib64/libpdfium.so (CFX_FontMapper::FindSubstFont(CFX_ByteString const&, int, unsigned int, int, int, int, CFX_SubstFont*)+2284)
#07 pc 0000000000195b40 /system/lib64/libpdfium.so (CFX_FontMgr::FindSubstFont(CFX_ByteString const&, int, unsigned int, int, int, int, CFX_SubstFont*)+184)
#08 pc 0000000000194838 /system/lib64/libpdfium.so (CFX_Font::LoadSubst(CFX_ByteString const&, int, unsigned int, int, int, int, int)+116)
#09 pc 00000000000d5ec4 /system/lib64/libpdfium.so (CPDF_SimpleFont::LoadCommon()+964)
#10 pc 00000000000d3568 /system/lib64/libpdfium.so (CPDF_Font::Load()+192)
#11 pc 00000000000d6724 /system/lib64/libpdfium.so (CPDF_Font::CreateFontF(CPDF_Document*, CPDF_Dictionary*)+308)
#12 pc 00000000000e54ac /system/lib64/libpdfium.so (CPDF_DocPageData::GetFont(CPDF_Dictionary*, int)+260)
#13 pc 00000000000ef308 /system/lib64/libpdfium.so (CPDF_StreamContentParser::FindFont(CFX_ByteString const&)+136)
#14 pc 00000000000ef3d4 /system/lib64/libpdfium.so (CPDF_StreamContentParser::Handle_SetFont()+152)
#15 pc 00000000000ee7a0 /system/lib64/libpdfium.so (CPDF_StreamContentParser::OnOperator(char const*)+204)
#16 pc 00000000000f3df0 /system/lib64/libpdfium.so (CPDF_StreamContentParser:
arse(unsigned char const*, unsigned int, unsigned int)+296)
#17 pc 00000000000f55f4 /system/lib64/libpdfium.so (CPDF_ContentParser::Continue(IFX_Pause*)+948)
#18 pc 00000000000df458 /system/lib64/libpdfium.so (CPDF_PageObjects::ContinueParse(IFX_Pause*)+28)
#19 pc 000000000009eeac /system/lib64/libpdfium.so (FPDF_LoadPage+112)
#20 pc 00000000000fe0d4 /system/lib64/libandroid_runtime.so
#21 pc 0000000000e3641c /data/dalvik-cache/arm64/system@framework@boot.oat
Tombstone written to: /data/tombstones/tombstone_03
channel '1ff9bd62 b4a.PDFRendererBug/b4a.PDFRendererBug.main (server)' ~ Consumer closed input channel or an error occurred. events=0x9
channel '1ff9bd62 b4a.PDFRendererBug/b4a.PDFRendererBug.main (server)' ~ Channel is unrecoverably broken and will be disposed!
Process 8220 exited due to signal (11)
Attempted to unregister already unregistered input channel '1ff9bd62 b4a.PDFRendererBug/b4a.PDFRendererBug.main (server)'
Error opening /proc/8220/oom_score_adj; errno=2
filter receiver for action = android.intent.action.DROPBOX_ENTRY_ADDED