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The call_fun() function in the BEAM emulator is supposed to
to put the fun term in the x register following the actual arguments
and environment for the fun. But if the fun is not loaded and
a call to the error_handler:undefined_lambda/3 function is set up,
the x(3) register will not be initialized.
The lack of initialization is very unlikely to cause a problem
in practice, because all of the following things must happen:
1) An unloaded fun must be called (i.e. the fun must have
been received from another node or from a file or dets table).
2) The process must be scheduled out before the call to the
error_handler:undefined_lambda/3 function can take place.
3) The process must be garbage collected before the process
is scheduled in.
4) The x(3) register must contain a stale cons or box pointer
that happens to point into the the heap of the currently
executing process. (Because of the literal pool, the GC will
never copy anything that is outside of the heap.)
I was not able to write a test case that would force an
emulator crash.
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Fixing miscellaneous "things" "detected" by dialyzer.
Also updated end date for a number of erts files.
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same thread
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* pan/halfword-tmp-heap-fixes/OTP-8332:
Fix assymetric (Un)UseTmpHeap in erl_process.c
Conflicts:
erts/emulator/beam/beam_emu.c
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* sverker/driver_SUITE_smp_select_nice_fail/OTP-9042:
Allow unexpected driver input event in driver_SUITE:smp_select
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* pan/inet-so-priority-ip-tos/OTP-9069:
Add patch from Per Hedeland
Ignore permission error when implicitly setting SO_PRIORITY
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* bjorn/erts/crash-dumps/OTP-9057:
Don't dump the contents of ordered_set ets tables
Write the value "Time left" for BIF timers as an unsigned integer
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* rickard/unbound/OTP-9056:
Allow bindtype unbound when no cpu topology is available
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* rickard/temp_alloc_check/OTP-9028:
Verify that temp allocated memory is released
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* rickard/mtx-destroy-ebusy/OTP-9009:
Send warning instead of abort on EBUSY from pthread_mutex_destroy
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Due to a bug in glibc the runtime system could abort
while trying to destroy a mutex. The runtime system
will now issue a warning instead of aborting.
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* rickard/poll-wake/OTP-9019:
Simplify erts_poll_wait() wakeup logic
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* bjorn/erts/minor-fixes:
BEAM loader: Add an assertion to check for overflowed code space
beam_emu: Eliminate redundant #ifdef
beam_emu: Remove unnecessary decrement of I in "case_end r"
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While at it, clean up indentation of CHKBLK() macros.
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The halfword emulator used to require special handling,
but no longer does.
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It is not necessary to decrement I, because an exception is
about to be generated. Furthermore, I pointing *before* the
instruction that caused the exception may cause problems in
the future.
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epoll on Linux has been seen to sometimes trigger unexpected
events. Most of the time these events are filtered by erl_check_io,
but may slip up to the driver in cases when fd's are reused.
Also made clear in driver docs that spurious events may happen.
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Per H @ Tail-f: The original code here had problems that possibly
only occur if you abuse it for non-INET sockets, but anyway:
a) If the getsockopt for SO_PRIORITY or IP_TOS failed, the actual
requested setsockopt was never even attempted.
b) If {get,set}sockopt for one of IP_TOS and SO_PRIORITY failed,
but ditto for the other worked and that was actually the requested
option, failure was still reported to erlang.
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* sverker/ets_halfword_highmem/OTP-8941:
HALFWORD ETS Fix copyright year in some source files
Fix vm crash in kernel test case seq_trace_SUITE:call
remove NIF compile warning: no previous prototype for ‘nif_init’
Refuse to load NIF library on wrong VM variant (halfword/fullword)
HALFWORD ETS match spec heap fragment optimization
HALFWORD ETS removed eheap and improved test case t_match_spec_run
HALFWORD ETS Further match spec optimization to minimize copying and garbage
HALFWORD ETS db_prog_match optimization
HALFWORD ETS Fix segv for match spec with several function and guards
HALFWORD Make system_info mseg_alloc report both low/high mem
HALFWORD Fix segv caused by erlang:halt
HALFWORD Make more allocators use high mem (binary, fixed and driver)
HALFWORD ETS 32-bit arch fixes and other cleanups
HALFWORD ETS nicer update_element
HALFWORD ETS Real matching on relative terms
HALFWORD first stab at high mem alloc
HALFWORD ETS relative terms
Conflicts:
erts/emulator/test/driver_SUITE.erl
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* egil/fix-win32-file-time/OTP-9046:
Fix win32 file drivers atime/mtime
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When setting file_info it will now correctly set access and
modified time. Previously these entities were swapped.
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Introduce HAllocX to allocate heap fragments with a larger capacity
than requested and by that reduce the number of fragments allocated.
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