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servers behaves
Rationale:
Some applications (like erlide) have code to be loaded dynamically on a
node. It may be slow to load everything upfront every time, so if the
node is in interactive mode, we would like to just append to the load
path. Currently, there is no direct way to detect if the node is running
in embedded mode or not so that we can do the right thing.
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When using the async thread pool and compressed files, when
an efile driver port instance is shutdown, the efile_drv
stop callback closes the file descriptor (a gzFile instance
actually) - this is dangerous if at the same time there's
an async thread performing an operation against the file,
for example calling invoke_read(), which can result in a
segmentation fault, or calling invoke_close() which double
closes the gzFile and this in turn causes 2 consecutive calls
to driver_free() against same gzFile instance (resulting in
later unexpected crashes in erl_bestfit_alloc.c for example).
The following test program makes the emulator crash when using
the async thread pool:
-module(t2).
-export([t/1]).
t(N) ->
file:delete("foo.bar"),
% Use of 'compressed' option, for creating/writing the file,
% is irrelevant. It only matters when opening it later for
% reads - a non-compressed file open with the 'compressed'
% option goes through an internal gzFile handle (instead of
% a plain integer fd), just like a compressed file.
%{ok, Fd} = file:open("foo.bar", [raw, write, binary]),
{ok, Fd} = file:open("foo.bar", [raw, write, binary, compressed]),
ok = file:write(Fd, <<"qwerty">>),
ok = file:close(Fd),
Pid = spawn_link(fun() ->
process_flag(trap_exit, true),
loop(N)
end),
Ref = erlang:monitor(process, Pid),
receive
{'DOWN', Ref, _, _, _} ->
ok
end.
loop(0) ->
ok;
loop(N) ->
Server = self(),
Pid = spawn(fun() ->
{ok, Fd} = file:open("foo.bar", [read, raw, binary, compressed]),
Server ! continue,
% Comment the file:read/2 call to make the file:close/1 call much
% more likely to crash or end up causing efile_drv to close twice
% the fd (gzFile), which will make the emulator crash later in the
% best fit allocator (erl_bestfit_alloc.c).
_ = file:read(Fd, 5),
file:close(Fd)
end),
receive continue -> ok end,
exit(Pid, shutdown),
loop(N - 1).
Running this test when using the async thread pool:
shell> erl +A 4
Erlang R15B03 (erts-5.9.3.1) [source] [64-bit] [smp:4:4] [async-threads:4] [hipe] [kernel-poll:false]
Eshell V5.9.3.1 (abort with ^G)
1> c(t2).
{ok,t2}
2> t2:t(500000).
Segmentation fault (core dumped)
When not using the async thread pool, there are no issues:
shell> erl
Erlang R15B03 (erts-5.9.3.1) [source] [64-bit] [smp:4:4] [async-threads:0] [hipe] [kernel-poll:false]
Eshell V5.9.3.1 (abort with ^G)
1> c(t2).
{ok,t2}
2> t2:t(500000).
ok
3>
An example stack trace when the crash happens because there's
an ongoing read operation is:
Thread 1 (Thread 0x7f021cf2c700 (LWP 10687)):
#0 updatewindow (strm=0x2691bf8, out=5) at zlib/inflate.c:338
#1 0x00000000005a2ba0 in inflate (strm=0x2691bf8, flush=0) at zlib/inflate.c:1141
#2 0x000000000055c46a in erts_gzread (file=0x2691bf8, buf=0x7f0215b29e80, len=5) at drivers/common/gzio.c:523
#3 0x00000000005849ef in invoke_read (data=0x26b2228) at drivers/common/efile_drv.c:1114
#4 0x000000000050adcb in async_main (arg=0x7f021bf5cf40) at beam/erl_async.c:488
#5 0x00000000005c21a0 in thr_wrapper (vtwd=0x7fff69c6ff10) at pthread/ethread.c:106
#6 0x00007f021c573e9a in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#7 0x00007f021c097cbd in clone () from /lib/x86_64-linux-gnu/libc.so.6
#8 0x0000000000000000 in ?? ()
And when there's an ongoing close operation when the driver
is stopped:
Thread 1 (Thread 0x7fe5f5654700 (LWP 747)):
#0 0x0000000000459b64 in bf_unlink_free_block (block=0x10b2a70, allctr=<optimized out>, flags=<optimized out>) at beam/erl_bestfit_alloc.c:792
#1 bf_unlink_free_block (flags=0, block=0x10b2a70, allctr=0x873380) at beam/erl_bestfit_alloc.c:822
#2 bf_get_free_block (allctr=0x873380, size=<optimized out>, cand_blk=<optimized out>, cand_size=<optimized out>, flags=0) at beam/erl_bestfit_alloc.c:869
#3 0x000000000044f0dd in mbc_alloc_block (alcu_flgsp=<synthetic pointer>, blk_szp=<synthetic pointer>, size=200, allctr=0x873380) at beam/erl_alloc_util.c:1198
#4 mbc_alloc (allctr=0x873380, size=200) at beam/erl_alloc_util.c:1345
#5 0x000000000045449b in do_erts_alcu_alloc (size=200, extra=0x873380, type=165) at beam/erl_alloc_util.c:3442
#6 erts_alcu_alloc_thr_pref (type=165, extra=<optimized out>, size=192) at beam/erl_alloc_util.c:3520
#7 0x000000000055c0bf in gz_open (mode=0x5d98b2 "rb", path=0x1103418 "foo.bar") at drivers/common/gzio.c:164
#8 erts_gzopen (path=0x1103418 "foo.bar", mode=0x5d98b2 "rb") at drivers/common/gzio.c:307
#9 0x0000000000584e47 in invoke_open (data=0x1103330) at drivers/common/efile_drv.c:1857
#10 0x000000000050adcb in async_main (arg=0x7fe5f698af80) at beam/erl_async.c:488
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* lukas/kernel/iter_max_socks_to_node/OTP-10734:
Isolate iter_max_socks to own node
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This prevents this testcase from ruining the entire
testrun if it should fail critically.
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* bjorn/kernel/undefined-function-handler/OTP-10617:
Teach error_handler to call '$handle_undefined_function'
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global_SUITE registers the name 'test_server' in the global registry
for what seems to be only historical reasons. Exactly how it happened
is lost in the mists of time, but I think the following is a reasonable
reconstruction:
* At one point in time, the test_server application started to do
a global registration of a 'test_server' process to support
embedded systems when the test_server application was run on both a
host and a target system.
* global_SUITE had to be modified to take the pre-existing
'test_server' registration into account.
* When Erlang/OTP switched to using common_test, global_SUITE was
modified to register the 'test_server' name itself in commit
8bd07f450816eaaae52d28740d89ead1f930cd02 (since the test_server
application does not register the 'test_server' name when run
under control of common_test).
To slightly reduce the size of global_SUITE, remove the redundant
registration and stop expecting 'test_server' to be registered.
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* sal/get_env/OTP-10694:
Moved documentation in a separate entry
Removed obsolete ?line macro
Add application:get_key/3
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The new function provides a default value for a configuration
parameter.
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* fdm/file-allocate/OTP-10680:
Update preloaded prim_file.beam
erts: Fix xcomp configure for fallocate
Add file:allocate/3 operation
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* egil/ignore-core:
test: Ignore cores in debug build for crash dumps
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This operation allows pre-allocation of space for files.
It succeeds only on systems that support such operation.
The POSIX standard defines the optional system call
posix_fallocate() to implement this feature. However,
some systems implement more specific functions to
accomplish the same operation.
On Linux, if the more specific function fallocate() is
implemented, it is used instead of posix_fallocate(),
falling back to posix_fallocate() if the fallocate()
call failed (it's only supported for the ext4, ocfs2,
xfs and btrfs file systems at the moment).
On Mac OS X it uses the specific fcntl() operation
F_PREALLOCATE, falling back to posix_fallocate() if
it's available (at the moment Mac OS X doesn't provide
posix_fallocate()).
On any other UNIX system, it uses posix_fallocate() if it's
available. Any other system not providing this system call
or any function to pre-allocate space for files, this operation
always fails with the ENOTSUP POSIX error.
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rickard/r16/port-optimizations/OTP-10336
* rickard/port-optimizations/OTP-10336:
Change annotate level for emacs-22 in cerl
Update etp-commands
Add documentation on communication in Erlang
Add support for busy port message queue
Add driver callback epilogue
Implement true asynchronous signaling between processes and ports
Add erl_drv_[send|output]_term
Move busy port flag
Use rwlock for driver list
Optimize management of port tasks
Improve configuration of process and port tables
Remove R9 compatibility features
Use ptab functionality also for ports
Prepare for use of ptab functionality also for ports
Atomic port state
Generalize process table implementation
Implement functionality for delaying thread progress from unmanaged threads
Conflicts:
erts/doc/src/erl_driver.xml
erts/doc/src/erlang.xml
erts/emulator/beam/beam_bif_load.c
erts/emulator/beam/beam_bp.c
erts/emulator/beam/beam_emu.c
erts/emulator/beam/bif.c
erts/emulator/beam/copy.c
erts/emulator/beam/erl_alloc.c
erts/emulator/beam/erl_alloc.types
erts/emulator/beam/erl_bif_info.c
erts/emulator/beam/erl_bif_port.c
erts/emulator/beam/erl_bif_trace.c
erts/emulator/beam/erl_init.c
erts/emulator/beam/erl_message.c
erts/emulator/beam/erl_port_task.c
erts/emulator/beam/erl_process.c
erts/emulator/beam/erl_process.h
erts/emulator/beam/erl_process_lock.c
erts/emulator/beam/erl_trace.c
erts/emulator/beam/export.h
erts/emulator/beam/global.h
erts/emulator/beam/io.c
erts/emulator/sys/unix/sys.c
erts/emulator/sys/vxworks/sys.c
erts/emulator/test/port_SUITE.erl
erts/etc/unix/cerl.src
erts/preloaded/ebin/erlang.beam
erts/preloaded/ebin/prim_inet.beam
erts/preloaded/src/prim_inet.erl
lib/hipe/cerl/erl_bif_types.erl
lib/kernel/doc/src/inet.xml
lib/kernel/src/inet.erl
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* fredrik/inet/export-ip-funcs/OTP-8067:
Inet doc clarifications
Documentation changes inet
Changes to function names, tests and docs of inet
Added specs and doc
Exported ipv4address and ipv6address functions to inet module, changed and made testcases
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made testcases
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* maint:
Skip ct_netconf tests if there is no crypto
Migrate timers from test_server to ct interface
Update tests to run with an oldshell emulator
Move crypto check so that tc is skipped and not failed
Update for new version of ppc compilation chain
Verify that ebin folder of applications exists
Conflicts:
lib/asn1/test/asn1_SUITE.erl
lib/kernel/test/interactive_shell_SUITE.erl
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* lukas/rcs-ppc-cross-tests/OTP-10265:
Skip ct_netconf tests if there is no crypto
Migrate timers from test_server to ct interface
Update tests to run with an oldshell emulator
Move crypto check so that tc is skipped and not failed
Update for new version of ppc compilation chain
Verify that ebin folder of applications exists
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* siri/cover-tests: (21 commits)
[common_test] Extend timer for flushing error logger
[cover] Allow reconnection if node has been disconnected or down
[cover] Don't kill remote nodes when connection to main node is lost
[test_server] Add option {start_cover,false} to test_server:start_node
Use code:lib_dir instead of code:which to get application directory
[common_test] Add test for OTP-9956
Include all kernel modules in code coverage analysis
[common_test] Add test suite for code coverage support
[common_test, test_server] Don't flush cover if cover is not running
[common_test] Add option cover_stop
[test_server] Allow cross cover analysis when testing through common_test
[test_server] Start cover in test_server:wait_for_node
[test_server] Multiply timers with timetrap_scale_factor when starting nodes
Include all stdlib modules in code coverage analysis
[test_server] Include all test_server modules in code coverage analysis
Skip epp_SUITE:otp_8911 if cover is running
[common_test] Start cover on slave nodes if running cover tests
[common_test] Don't stop cover before stopping slave node
[test_server] Don't stop cover after test is finished
[cover] Add support for test_server
...
OTP-10427
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* raimo/IPV6_V6ONLY/OTP-8928:
kernel: Document socket option ipv6_v6only
kernel: Add test cases for socket option ipv6_v6only
erts,kernel: Implement socket option ipv6_v6only in erlang code
erts: Implement socket option IPV6_V6ONLY
erts: Add configure test for IPV6_V6ONLY
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code_SUITE:ext_mod_dep used code:which(kernel) to get the path to the
kernel ebin directory. This failed when kernel was cover compiled,
since code:which then returns 'cover_compiled'. Using code:lib_dir
instead solved the problem.
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Conflicts:
erts/etc/common/heart.c
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Timeouts were set too narrow and timedout on slow machines
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Some of the tests which tested shell output assumed that
when starting a shell using `erl` a shell with newshell
was used. This is not true for systems built with
--disable-termcap, so the on some embedded systems those
tests failed.
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* node_start_soon_after_crash tests that heart restarts
beam upon a crash and only lets beam write its crash
dump for a certain amount of time
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* node_start_immediately_after_crash tests that heart restarts
beam upon a crash and will not generate a crash dump
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Test case for testing socket option {active, true} after
association is peeled off.
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Conflicts:
lib/diameter/autoconf/vxworks/sed.general
xcomp/README.md
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Long input paths (longer than MAX_PATH) would get copied
into a buffer of size MAX_PATH for read_link and altname
in efile_drv.
Also fixed misuse of size_t parameter as wchar_t *
string length in win_efile:efile_readlink.
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* maint:
Bumped version nr
ssl & public_key: Workaround that some certificates encode countryname as utf8 and close down gracefully if other ASN-1 errors occur.
Add more cross reference links to ct docs
Remove config option from common_test args
Update user config to use nested tuple keys
Allow mixed IPv4 and IPv6 addresses to sctp_bindx
Add checks for in6addr_any and in6addr_loopback
Fix SCTP multihoming
observer: fix app file (Noticed-by: Motiejus Jakstys)
Fix lib/src/test/ssh_basic_SUITE.erl to fix IPv6 option typos
Prevent index from being corrupted if a nonexistent item is deleted
Add tests showing that trying to delete non-existing object may corrupt the table index
Fix Table Viewer search crash on new|changed|deleted rows
Escape control characters in Table Viewer
Fix Table Viewer crash after a 'Found' -> 'Not found' search sequence
inet_drv.c: Set sockaddr lengths in inet_set_[f]address
Conflicts:
erts/preloaded/ebin/prim_inet.beam
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* tab/fix-sctp-multihoming-IPv6/OTP-10217:
Allow mixed IPv4 and IPv6 addresses to sctp_bindx
Add checks for in6addr_any and in6addr_loopback
Fix SCTP multihoming
inet_drv.c: Set sockaddr lengths in inet_set_[f]address
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Conflicts:
erts/preloaded/ebin/init.beam
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Workaround for crash in code_server.
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Conflicts:
erts/doc/src/erlang.xml
erts/preloaded/ebin/init.beam
lib/kernel/doc/src/os.xml
lib/stdlib/test/filename_SUITE.erl
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