Ios uiwebview crash -

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my app use uiwebview load web pages, randomly crash , can't reproduce it, register lr same pc,is stack destroy ?

crash stack looks this:

0 libsystem_platform.dylib 0x000000019557845c __os_lock_corruption_abort     1 cfnetwork 0x0000000182f4c890 urlconnectionloader::_loaderevent_ackbytes(long long)     2 cfnetwork 0x0000000182e791b4 urlconnectionclient::_internal_capturedataarray()     3 cfnetwork 0x0000000182e78f24 invocation function block in urlconnectionclient_classic::_delegate_didreceivedataarray()     4 cfnetwork 0x0000000182f4550c invocation function block in urlconnectionclient_classic::_withdelegateasync(char const*, void (_cfurlconnection*, cfurlconnectionclientcurrent_vmax const*) block_pointer)     5 cfnetwork 0x0000000182e67ac8 runloopblockcontext::_invoke_block(void const*, void*)     6 corefoundation 0x0000000183408cdc cfarrayapplyfunction + 68     7 cfnetwork 0x0000000182e67974 runloopblockcontext::perform()     8 cfnetwork 0x0000000182e67828 multiplexersource::perform()     9 cfnetwork 0x0000000182e67654 multiplexersource::_perform(void*)     10 corefoundation 0x00000001834e0240 ___cfrunloop_is_calling_out_to_a_source0_perform_function__     11 corefoundation 0x00000001834df4e4 ___cfrunloopdosources0     12 corefoundation 0x00000001834dd594 ___cfrunlooprun     13 corefoundation 0x00000001834092d4 cfrunlooprunspecific + 396     14 webcore 0x0000000191e04894 runwebthread(void*)     15 libsystem_pthread.dylib 0x000000019557fdc8 __pthread_body     16 libsystem_pthread.dylib 0x000000019557fd24 __pthread_body     17 libsystem_pthread.dylib 0x000000019557cef8 thread_start + 4  x0:  0x0000000170154214    x1: 0x0000000170154208    x2: 0x0000000170184030     x3: 000000000000000000  x4:  000000000000000000    x5: 000000000000000000    x6: 0x00000001704882c0     x7: 0x0000000000000fd0  x8:  0x0000000000019000    x9: 0x0000000026303831   x10: 0x0000000195f0b000    x11: 0x0000000300000003 x12: 0x00000001700768f0    x13: 0x000001a595f0df89   x14: 0x68a34dca3dfae422    x15: 0x00000000000000c8 x16: 0x00000001957d83b4    x17: 0x00000001840ba268   x18: 000000000000000000    x19: 0x0000000170154214 x20: 0x0000000000000001    x21: 0x0000000000000001   x22: 0x0000000000000002    x23: 0x00000001740afb40 x24: 0x0000000000000001    x25: 0x0000000000000001   x26: 0x0000000195c50e52    x27: 0x0000000195c5d13c x28: 000000000000000000    fp: 0x0000000105ebaa80    lr: 0x00000001957d845c sp: 0x0000000105ebaa50     pc: 0x00000001957d845c


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