Testcase found while fuzzing mozilla-central rev d3aa4a9e4dfd. Assertion failure: mOffset == mSize, at /builds/worker/workspace/build/src/dom/filehandle/ActorsParent.cpp:1915 ``` rax = 0x000055a6531b9340 rdx = 0x0000000000000000 rcx = 0x00007f6fc7c68941 rbx = 0x00007f6f9db1c660 rsi = 0x00007f6fd38a08b0 rdi = 0x00007f6fd389f680 rbp = 0x00007f6f9cffe470 rsp = 0x00007f6f9cff63f0 r8 = 0x00007f6fd38a08b0 r9 = 0x00007f6f9cfff700 r10 = 0x0000000000000002 r11 = 0x0000000000000000 r12 = 0x00007f6f9cff6430 r13 = 0x00007f6f9cff6418 r14 = 0x00007f6f9cff6420 r15 = 0x0000000000000000 rip = 0x00007f6fc37a6e58 OS|Linux|0.0.0 Linux 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 CPU|amd64|family 6 model 94 stepping 3|8 GPU||| Crash|SIGSEGV|0x0|68 68|0|libxul.so|mozilla::dom::CopyFileHandleOp::DoFileWork(mozilla::dom::FileHandle*)|hg:hg.mozilla.org/mozilla-central:dom/filehandle/ActorsParent.cpp:d3aa4a9e4dfd20e2be232a415a705a250aa17f63|1853|0x33 ```
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Testcase found while fuzzing mozilla-central rev d3aa4a9e4dfd (built with --enable-debug). Assertion failure: mOffset == mSize, at /builds/worker/workspace/build/src/dom/filehandle/ActorsParent.cpp:1915 ``` rax = 0x000055a6531b9340 rdx = 0x0000000000000000 rcx = 0x00007f6fc7c68941 rbx = 0x00007f6f9db1c660 rsi = 0x00007f6fd38a08b0 rdi = 0x00007f6fd389f680 rbp = 0x00007f6f9cffe470 rsp = 0x00007f6f9cff63f0 r8 = 0x00007f6fd38a08b0 r9 = 0x00007f6f9cfff700 r10 = 0x0000000000000002 r11 = 0x0000000000000000 r12 = 0x00007f6f9cff6430 r13 = 0x00007f6f9cff6418 r14 = 0x00007f6f9cff6420 r15 = 0x0000000000000000 rip = 0x00007f6fc37a6e58 OS|Linux|0.0.0 Linux 5.3.0-28-generic #30~18.04.1-Ubuntu SMP Fri Jan 17 06:14:09 UTC 2020 x86_64 CPU|amd64|family 6 model 94 stepping 3|8 GPU||| Crash|SIGSEGV|0x0|68 68|0|libxul.so|mozilla::dom::CopyFileHandleOp::DoFileWork(mozilla::dom::FileHandle*)|hg:hg.mozilla.org/mozilla-central:dom/filehandle/ActorsParent.cpp:d3aa4a9e4dfd20e2be232a415a705a250aa17f63|1853|0x33 ```