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Bug #18816
closed
Ractor segfaulting MacOS 12.4 (aarch64 / M1 processor)
Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]
Description
Reproduction server:
require 'socket'
# Set based on CPU count
CONCURRENCY = 8
server = TCPServer.new(8080)
workers = CONCURRENCY.times.map do
Ractor.new do
loop do
# receive TCPSocket
session = Ractor.recv
request = session.gets
puts request
session.print "HTTP/1.1 200\r\n"
session.print "Content-Type: text/html\r\n"
session.print "\r\n"
session.print "Hello world! Current time is #{Time.now}"
session.close
end
end
end
loop do
conn, _ = server.accept
# pass TCPSocket to one of the workers
workers.sample.send(conn, move: true)
end
run apache benchmark against code above:
ab -n 20000 -c 20 http://localhost:8080/
ractorserver-crash.rb:21: [BUG] Segmentation fault at 0xf94012a9aa1503e8
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]
-- Crash Report log information --------------------------------------------
See Crash Report log file in one of the following locations:
* ~/Library/Logs/DiagnosticReports
* /Library/Logs/DiagnosticReports
for more details.
Don't forget to include the above Crash Report log file in bug reports.
-- Control frame information -----------------------------------------------
c:0005 p:---- s:0019 e:000018 CFUNC :close
c:0004 p:0074 s:0015 e:000014 BLOCK ractorserver-crash.rb:21 [FINISH]
c:0003 p:---- s:0010 e:000009 CFUNC :loop
c:0002 p:0004 s:0006 e:000005 BLOCK ractorserver-crash.rb:10 [FINISH]
c:0001 p:---- s:0003 e:000002 (none) [FINISH]
-- Ruby level backtrace information ----------------------------------------
ractorserver-crash.rb:10:in `block (2 levels) in <main>'
ractorserver-crash.rb:10:in `loop'
ractorserver-crash.rb:21:in `block (3 levels) in <main>'
ractorserver-crash.rb:21:in `close'
-- Machine register context ------------------------------------------------
x0: 0x0000000000000000 x1: 0x000000011d009a00 x2: 0x0000000000000000
x3: 0x0000000000000000 x4: 0x000000016be1a034 x5: 0x0000000000000000
x6: 0x0000000000000030 x7: 0x000000016be1a050 x18: 0x0000000000000000
x19: 0x000000016be1a098 x20: 0x000000000000000c x21: 0x000000011d009a00
x22: 0x0000000104f046a8 x23: 0x000000011d009b60 x24: 0xf94012a9aa1503e8
x25: 0x0000000000000002 x26: 0x00006000029d66a0 x27: 0x0000000000000000
x28: 0x0000000055550083 lr: 0x0000000104dddad4 fp: 0x000000016be1a080
sp: 0x000000016be1a030
-- Other runtime information -----------------------------------------------
* Loaded script: ractorserver-crash.rb
* Loaded features:
0 enumerator.so
1 thread.rb
2 fiber.so
3 rational.so
4 complex.so
5 ruby2_keywords.rb
6 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/enc/encdb.bundle
7 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/enc/trans/transdb.bundle
8 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/rbconfig.rb
9 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/compatibility.rb
10 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/defaults.rb
11 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/deprecate.rb
12 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/errors.rb
13 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/unknown_command_spell_checker.rb
14 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/exceptions.rb
15 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/basic_specification.rb
16 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/stub_specification.rb
17 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/platform.rb
18 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/version.rb
19 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/requirement.rb
20 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/util/list.rb
21 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/specification.rb
22 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/util.rb
23 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/dependency.rb
24 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/core_ext/kernel_gem.rb
25 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/monitor.bundle
26 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/monitor.rb
27 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/core_ext/kernel_require.rb
28 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/core_ext/kernel_warn.rb
29 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems.rb
30 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/rubygems/path_support.rb
31 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/error_highlight/version.rb
32 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/error_highlight/base.rb
33 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/error_highlight/formatter.rb
34 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/error_highlight/core_ext.rb
35 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/error_highlight.rb
36 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/version.rb
37 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/core_ext/name_error.rb
38 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/levenshtein.rb
39 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/jaro_winkler.rb
40 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checker.rb
41 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers/class_name_checker.rb
42 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers/variable_name_checker.rb
43 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/name_error_checkers.rb
44 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/method_name_checker.rb
45 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/key_error_checker.rb
46 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/null_checker.rb
47 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/tree_spell_checker.rb
48 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/require_path_checker.rb
49 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/spell_checkers/pattern_key_name_checker.rb
50 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean/formatter.rb
51 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/did_you_mean.rb
52 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/socket.bundle
53 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/arm64-darwin21/io/wait.bundle
54 /Users/brodock/.rvm/rubies/ruby-3.1.2/lib/ruby/3.1.0/socket.rb
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[IMPORTANT]
Don't forget to include the Crash Report log file under
DiagnosticReports directory in bug reports.
Files
Updated by brodock (Gabriel Mazetto) over 2 years ago
- ruby -v set to ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21]
Updated by tombruijn (Tom de Bruijn) over 2 years ago
- File segfault.txt segfault.txt added
I get the same segfault, but not as consistent as Gabriel. I had to first do a normal request in the browser before running "ab" the couple times it printed the segfault, but I haven't been able to reproduce as consistently. The localhost:8080 server is also unresponsive after running "ab" and I need to kill the process to try again when it doesn't segfault.
Environment details:
- Ruby 3.1.2p20 installed using ruby-install and managed with chruby. (ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [arm64-darwin21])
- macOS 12.4
- MacBook Pro M1 Pro (14-inch 2021)
Running as:
chruby 3.1.2
ruby app.rb
See attached segfault file of a time that it segfaulted.
Updated by brodock (Gabriel Mazetto) over 2 years ago
I've tried to isolate the problem with a few attempts:
First guess was that something GC related (cleaning up something that was still in use etc).
I've tried to disable GC with code below:
require 'socket'
# Set based on CPU count
CONCURRENCY = 8
GC.disable
server = TCPServer.new(8080)
workers = CONCURRENCY.times.map do
Ractor.new do
loop do
# receive TCPSocket
session = Ractor.recv
request = session.gets
puts request
session.print "HTTP/1.1 200\r\n"
session.print "Content-Type: text/html\r\n"
session.print "\r\n"
session.print "Hello world! Current time is #{Time.now}"
session.close
end
end
end
loop do
conn, _ = server.accept
# pass TCPSocket to one of the workers
workers.sample.send(conn, move: true)
end
still get segfault.
Then tried to run the same code with 3.1.2 compiled with jemalloc, assuming could be something malloc related, still get a segfault.
Updated by brodock (Gabriel Mazetto) over 2 years ago
I've tried to reproduce the problem in a container running from the M1 mac as host, but it seems the issue is mac-specific, as I couldn't make it SEGV.
Linux ac9a228ca7ac 5.15.40-0-virt #1-Alpine SMP Wed, 18 May 2022 08:12:19 +0000 aarch64 GNU/Linux
using ruby:3.1.2 docker tag (running from containerd using rancher-desktop)
Updated by tenderlovemaking (Aaron Patterson) over 2 years ago
- File 0001-Use-VM-Lock-when-mutating-waiting-threads-list.patch 0001-Use-VM-Lock-when-mutating-waiting-threads-list.patch added
I took a look at this, and it looks like we're missing a lock when deleting the fd from waiting_fds list. I've attached a patch that fixes the crash for me. It seems like not every request gets serviced, but I think that might be a different problem.
I've also sent a pull request on GitHub here: https://github.com/ruby/ruby/pull/6116
Updated by tenderlovemaking (Aaron Patterson) over 2 years ago
- Status changed from Open to Closed
Applied in changeset git|de51bbcb544651fb499dd4cc757a2bf6f3b439cf.
Use VM Lock when mutating waiting threads list
rb_thread_wait_for_single_fd needs to mutate the waiting_fds list
that is stored on the VM. We need to delete the FD from the list before
returning, and deleting from the list requires a VM lock (because the
list is a global).
[Bug #18816] [ruby-core:108771]
Co-Authored-By: Alan Wu alanwu@ruby-lang.org
Updated by brodock (Gabriel Mazetto) over 2 years ago
Can we backport this to 3.0 and 3.1?
Updated by tenderlovemaking (Aaron Patterson) over 2 years ago
- Backport changed from 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN to 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: REQUIRED
Updated by brodock (Gabriel Mazetto) over 2 years ago
I don't get a ruby segfault anymore. It works fine when using no concurrency:
hey -n 20000 http://localhost:8080/
Summary:
Total: 22.5328 secs
Slowest: 1.8602 secs
Fastest: 0.0004 secs
Average: 0.0477 secs
Requests/sec: 887.5935
Response time histogram:
0.000 [1] |
0.186 [17315] |■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
0.372 [2634] |■■■■■■
0.558 [0] |
0.744 [0] |
0.930 [0] |
1.116 [0] |
1.302 [0] |
1.488 [0] |
1.674 [0] |
1.860 [50] |
Latency distribution:
10% in 0.0021 secs
25% in 0.0025 secs
50% in 0.0029 secs
75% in 0.0036 secs
90% in 0.3043 secs
95% in 0.3081 secs
99% in 0.3132 secs
Details (average, fastest, slowest):
DNS+dialup: 0.0462 secs, 0.0004 secs, 1.8602 secs
DNS-lookup: 0.0006 secs, 0.0000 secs, 0.0159 secs
req write: 0.0001 secs, 0.0000 secs, 0.0052 secs
resp wait: 0.0012 secs, 0.0000 secs, 0.0118 secs
resp read: 0.0002 secs, 0.0000 secs, 0.0065 secs
Status code distribution:
[200] 20000 responses
with -c 20, I get an IOError after a while, which seems to correlate to what you identified as not all requests finishing.
I will open a separate issue for that:
Updated by nagachika (Tomoyuki Chikanaga) about 2 years ago
- Backport changed from 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: REQUIRED to 2.7: UNKNOWN, 3.0: REQUIRED, 3.1: DONE
ruby_3_1 99d254d8b025fd952375ed15c345ecc1b806652a merged revision(s) de51bbcb544651fb499dd4cc757a2bf6f3b439cf.
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