[racket-dev] ffi crash on callback during GC
I'm having trouble with DrRacket crashing on the use in C of a callback created using the ffi library.
After reading the docs, it occured to me that the problem might be that the callback was being collected. My understanding is that with #:keep #t, I need to make sure that the scheme value created by _fun must not be GCed, so I added a binding (code below). Unfortunately, this didn't prevent the crash.
Taking a look at the crash report, I see that the crash appears to happen when the callback is called by a C thread while Racket is collecting garbage, and I realize I don't have a clear picture of what's supposed to happen here; Racket's gc is (IIRC) stop-the-world, so running the callback code seems impossible; or, at the very least, a bad idea.
So: is racket supposed to magically handle this? If not, is there some easy way to make a callback abort with a particular value when it's called during GC? I took a look at the FFI manual section on memory management, which didn't appear to contain anything relevant.
Also, I've attached the crash report; note that the crash is associated with thread 6, the one trying to make the callback.
Thanks for any advice; RTFMs gratefully accepted.
John
;; code with added binding for callback to prevent GC:
(define pa-open-default-stream
(get-ffi-obj "Pa_OpenDefaultStream"
libportaudio
(_fun (result : (_ptr o _pa-stream)) ;; stream
_int ;; numInputChannels
_int ;; numOutputChannels
_pa-sample-format ;; sampleFormat
_double ;; sampleRate
_ulong ;; framesPerBuffer
;; give this a name to prevent it from being collected:
(callback : _pa-stream-callback) ;; streamCallback
_pointer ;; userData?
-> (err : _pa-error)
-> (match err
['paNoError result]
[other (error 'pa-open-default-stream "~a ~a" (pa-get-error-text err)
callback)]))))
;; crash report:
Process: DrRacket [4157]
Path: /Users/clements/plt/bin/../DrRacket.app/Contents/MacOS/DrRacket
Identifier: org.racket-lang.DrRacket
Version: 5.0.99.2 (5.0.99.2)
Code Type: X86-64 (Native)
Parent Process: bash [1705]
Date/Time: 2010-11-22 14:50:06.241 -0800
OS Version: Mac OS X 10.6.5 (10H574)
Report Version: 6
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: 0x000000000000000d, 0x0000000000000000
Crashed Thread: 6
Thread 0: Dispatch queue: com.apple.main-thread
0 Racket 0x000000010026981c GC_mark2 + 428
1 Racket 0x000000010026a0df propagate_marks + 287
2 Racket 0x000000010026a1b8 propagate_marks_plus_ephemerons + 24
3 Racket 0x0000000100267011 garbage_collect + 833
4 Racket 0x000000010026c3bc GC_malloc_atomic + 732
5 Racket 0x00000001000dff30 ts_prepare_retry_alloc + 336
6 ??? 0x00000001004dfd56 0 + 4300078422
7 ??? 0x00000001007f5325 0 + 4303311653
8 Racket 0x00000001000555fd scheme_do_eval + 7853
9 Racket 0x000000010021b249 define_execute_with_dynamic_state + 681
10 Racket 0x0000000100054a69 scheme_do_eval + 4889
11 Racket 0x000000010013b95e body_one_expr + 142
12 Racket 0x0000000100055dad scheme_do_eval + 9821
13 Racket 0x000000010007f2b9 scheme_finish_apply_for_prompt + 857
14 Racket 0x000000010007f4a4 scheme_apply_for_prompt + 84
15 Racket 0x000000010008b9d6 call_with_prompt + 1318
16 Racket 0x000000010005592b scheme_do_eval + 8667
17 Racket 0x000000010007fb09 do_call_with_prompt + 361
18 Racket 0x000000010013b609 scheme_module_run_finish + 889
19 ??? 0x00000001004e1595 0 + 4300084629
20 Racket 0x00000001000b6025 scheme_module_run_start + 117
21 Racket 0x0000000100126deb eval_module_body + 123
22 Racket 0x0000000100126f1a do_start_module + 266
23 Racket 0x000000010012f7b2 start_module + 2322
24 Racket 0x0000000100132b4c _dynamic_require + 780
25 Racket 0x000000010013d450 scheme_dynamic_require + 240
26 ??? 0x00000001004de17b 0 + 4300071291
27 Racket 0x00000001000555fd scheme_do_eval + 7853
28 Racket 0x000000010005678e _scheme_apply_multi_from_native + 78
29 ??? 0x00000001004de0b5 0 + 4300071093
30 Racket 0x00000001000555fd scheme_do_eval + 7853
31 Racket 0x00000001000791b5 scheme_dynamic_wind + 1029
32 Racket 0x00000001000798c6 dynamic_wind + 294
33 Racket 0x000000010005592b scheme_do_eval + 8667
34 Racket 0x00000001000723f3 force_values + 275
35 Racket 0x000000010007c549 scheme_force_value_same_mark + 105
36 ??? 0x00000001004e7c83 0 + 4300110979
37 Racket 0x00000001000555fd scheme_do_eval + 7853
38 Racket 0x000000010007f2b9 scheme_finish_apply_for_prompt + 857
39 Racket 0x000000010007f4a4 scheme_apply_for_prompt + 84
40 Racket 0x000000010008b9d6 call_with_prompt + 1318
41 Racket 0x0000000100056873 _scheme_apply_multi_from_native + 307
42 ??? 0x00000001013d1f8f 0 + 4315750287
43 ??? 0x00000001017e50a6 0 + 4320022694
44 Racket 0x00000001000555fd scheme_do_eval + 7853
45 Racket 0x000000010007f2b9 scheme_finish_apply_for_prompt + 857
46 Racket 0x000000010007f4a4 scheme_apply_for_prompt + 84
47 Racket 0x000000010008b9d6 call_with_prompt + 1318
48 Racket 0x0000000100056873 _scheme_apply_multi_from_native + 307
49 ??? 0x00000001013d1f8f 0 + 4315750287
50 ??? 0x00000001017e50a6 0 + 4320022694
51 Racket 0x00000001000555fd scheme_do_eval + 7853
52 Racket 0x000000010007f2b9 scheme_finish_apply_for_prompt + 857
53 Racket 0x000000010007f4a4 scheme_apply_for_prompt + 84
54 Racket 0x000000010008b9d6 call_with_prompt + 1318
55 ??? 0x00000001004de17b 0 + 4300071291
56 Racket 0x00000001000555fd scheme_do_eval + 7853
57 Racket 0x000000010007c3ea apply_k + 186
58 Racket 0x000000010007d026 scheme_top_level_do_worker + 1222
59 Racket 0x000000010007dc80 call_with_continuation_barrier + 128
60 ??? 0x00000001004e77af 0 + 4300109743
61 Racket 0x00000001000555fd scheme_do_eval + 7853
62 Racket 0x00000001000791b5 scheme_dynamic_wind + 1029
63 Racket 0x00000001000798c6 dynamic_wind + 294
64 ??? 0x00000001004de17b 0 + 4300071291
65 Racket 0x00000001000555fd scheme_do_eval + 7853
66 Racket 0x000000010007b502 do_call_ec + 1026
67 Racket 0x000000010007b6f6 scheme_call_ec + 134
68 ??? 0x00000001004e77af 0 + 4300109743
69 Racket 0x00000001000555fd scheme_do_eval + 7853
70 Racket 0x000000010007c3ea apply_k + 186
71 Racket 0x000000010007cf91 scheme_top_level_do_worker + 1073
72 Racket 0x000000010023e224 start_child + 1156
73 Racket 0x000000010023e465 make_subprocess + 565
74 Racket 0x000000010023e75e scheme_thread_w_details + 462
75 ??? 0x00007fff5fbfa1a0 0 + 140734799782304
76 Racket 0x00000001002357fe will_executor_go + 158
77 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
78 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
79 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
80 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
81 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
82 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
83 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
84 Racket 0x00000001001cf037 scheme_uncopy_stack + 407
85 Racket 0x00000001001cf0c8 scheme_longjmpup + 136
86 Racket 0x000000010022f0f5 do_swap_thread + 1541
87 Racket 0x000000010023a14e scheme_thread_block + 2446
88 Racket 0x000000010023aabc scheme_block_until + 332
89 Racket 0x000000010023c205 do_sync + 1141
90 ??? 0x00000001004de17b 0 + 4300071291
91 Racket 0x00000001000555fd scheme_do_eval + 7853
92 Racket 0x000000010005678e _scheme_apply_multi_from_native + 78
93 ??? 0x00000001004e7f2a 0 + 4300111658
94 Racket 0x00000001000555fd scheme_do_eval + 7853
95 Racket 0x000000010005678e _scheme_apply_multi_from_native + 78
96 ??? 0x00000001004de0b5 0 + 4300071093
97 Racket 0x00000001000555fd scheme_do_eval + 7853
98 Racket 0x000000010007c3ea apply_k + 186
99 Racket 0x000000010007d026 scheme_top_level_do_worker + 1222
100 org.racket-lang.DrRacket 0x00000001000034c5 finish_cmd_line_run + 3845
101 org.racket-lang.DrRacket 0x00000001000040ba main_after_stack + 2650
102 Racket 0x000000010000e8ec scheme_main_stack_setup + 156
103 org.racket-lang.DrRacket 0x0000000100001da4 main + 36
104 org.racket-lang.DrRacket 0x0000000100001d54 start + 52
Thread 1:
0 libSystem.B.dylib 0x00007fff8152d2da mach_msg_trap + 10
1 libSystem.B.dylib 0x00007fff8152d94d mach_msg + 59
2 Racket 0x00000001002622f6 exception_thread + 134
3 libSystem.B.dylib 0x00007fff81566536 _pthread_start + 331
4 libSystem.B.dylib 0x00007fff815663e9 thread_start + 13
Thread 2:
0 libSystem.B.dylib 0x00007fff81567fca __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff81567e59 nanosleep + 148
2 libSystem.B.dylib 0x00007fff81567dc3 usleep + 57
3 Racket 0x0000000100173351 green_thread_timer + 81
4 libSystem.B.dylib 0x00007fff81566536 _pthread_start + 331
5 libSystem.B.dylib 0x00007fff815663e9 thread_start + 13
Thread 3: Dispatch queue: com.apple.libdispatch-manager
0 libSystem.B.dylib 0x00007fff8154616a kevent + 10
1 libSystem.B.dylib 0x00007fff8154803d _dispatch_mgr_invoke + 154
2 libSystem.B.dylib 0x00007fff81547d14 _dispatch_queue_invoke + 185
3 libSystem.B.dylib 0x00007fff8154783e _dispatch_worker_thread2 + 252
4 libSystem.B.dylib 0x00007fff81547168 _pthread_wqthread + 353
5 libSystem.B.dylib 0x00007fff81547005 start_wqthread + 13
Thread 4: com.apple.CFSocket.private
0 libSystem.B.dylib 0x00007fff81570e92 select$DARWIN_EXTSN + 10
1 com.apple.CoreFoundation 0x00007fff8121c498 __CFSocketManager + 824
2 libSystem.B.dylib 0x00007fff81566536 _pthread_start + 331
3 libSystem.B.dylib 0x00007fff815663e9 thread_start + 13
Thread 5:
0 libSystem.B.dylib 0x00007fff81567fca __semwait_signal + 10
1 libSystem.B.dylib 0x00007fff8156bde1 _pthread_cond_wait + 1286
2 Racket 0x000000010017301b pt_sema_wait + 43
3 Racket 0x000000010017305c do_watch + 28
4 libSystem.B.dylib 0x00007fff81566536 _pthread_start + 331
5 libSystem.B.dylib 0x00007fff815663e9 thread_start + 13
Thread 6 Crashed:
0 Racket 0x00000001001733b9 scheme_signal_received_at + 9
1 Racket 0x000000010024e93d ffi_queue_callback + 205
2 Racket 0x0000000100260f9e ffi_closure_unix64_inner + 462
3 Racket 0x00000001002601fe ffi_closure_unix64 + 70
4 libportaudio.2.0.0.dylib 0x0000000118c63bd0 AdaptingOutputOnlyProcess + 224
5 libportaudio.2.0.0.dylib 0x0000000118c64a0b PaUtil_EndBufferProcessing + 699
6 libportaudio.2.0.0.dylib 0x0000000118c69d88 AudioIOProc + 2392
7 ...pple.audio.units.Components 0x0000000128e905d0 0x128e88000 + 34256
8 ...pple.audio.units.Components 0x0000000128e90194 0x128e88000 + 33172
9 ...pple.audio.units.Components 0x0000000128e8e523 0x128e88000 + 25891
10 ...pple.audio.units.Components 0x0000000128e8d870 0x128e88000 + 22640
11 ...pple.audio.units.Components 0x0000000128e92ceb AUGenericOutputEntry + 5963
12 com.apple.audio.CoreAudio 0x00007fff87a9d32d HP_IOProc::Call(AudioTimeStamp const&, AudioTimeStamp const&, AudioBufferList const*, AudioTimeStamp const&, AudioBufferList*) + 313
13 com.apple.audio.CoreAudio 0x00007fff87a9d0ff IOA_Device::CallIOProcs(AudioTimeStamp const&, AudioTimeStamp const&, AudioTimeStamp const&) + 303
14 com.apple.audio.CoreAudio 0x00007fff87a9cf35 HP_IOThread::PerformIO(AudioTimeStamp const&, double) + 771
15 com.apple.audio.CoreAudio 0x00007fff87a9af44 HP_IOThread::WorkLoop() + 1832
16 com.apple.audio.CoreAudio 0x00007fff87a9a817 HP_IOThread::ThreadEntry(HP_IOThread*) + 9
17 com.apple.audio.CoreAudio 0x00007fff87a9a745 CAPThread::Entry(CAPThread*) + 125
18 libSystem.B.dylib 0x00007fff81566536 _pthread_start + 331
19 libSystem.B.dylib 0x00007fff815663e9 thread_start + 13
Thread 6 crashed with X86 Thread State (64-bit):
rax: 0x0000000000000016 rbx: 0x000000011df46650 rcx: 0x00007fff7026f630 rdx: 0x0000000000000000
rdi: 0x000d400000000000 rsi: 0x0000000000000016 rbp: 0x000000012c3a2430 rsp: 0x000000012c3a2420
r8: 0x0000000000000001 r9: 0x0000000000000001 r10: 0x0000000000000001 r11: 0x0000000011df8dd9
r12: 0x0000000119af8db8 r13: 0x0000000127226f90 r14: 0x000000012c3a24a0 r15: 0x000000012c3a2650
rip: 0x00000001001733b9 rfl: 0x0000000000010202 cr2: 0x000000011eb1e8c0
Binary Images:
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