Ticket #480 (closed defect: fixed)

Opened 19 months ago

Last modified 18 months ago

segfault when failing to clean up database connections

Reported by: wja Owned by: ryanc
Priority: major Milestone:
Component: ryanc/db.plt Keywords:
Cc: Version:
Racket Version:

Description

I have been fairly regularly getting segfaults while using the db module inside of DrRacket?. I don't know enough about Racket's internals to track down the problem, but I have come up with a short program that allows it to be reproduced (at least on my machine) and might be revealing to someone else. If I run the following roughly a dozen times in a row, I get a segfault (see report below).

#lang racket
(require db)
(define ndb (sqlite3-connect #:database "my.db" #:mode 'read/write))
(start-transaction ndb)
;(with-handlers ([exn:fail? (lambda (e) (disconnect ndb) (error "now break"))])

(error "whoops")

; )
(commit-transaction ndb)
(disconnect ndb)

If one uncomments the exception handler, this can be run indefinitely without a segfault.

Obviously, one response would be don't do that! But, of course, it is the kind of problem
that one runs into when debugging code that uses the db module.

Regrets that I can't contribute a patch.

--

Process: DrRacket? [9000]
Path: /Applications/Racket v5.3/DrRacket.app/Contents/MacOS/DrRacket
Identifier: org.racket-lang.DrRacket?
Version: 5.3 (5.3)
Code Type: X86 (Native)
Parent Process: launchd [191]

Date/Time: 2012-10-10 19:06:31.035 +0200
OS Version: Mac OS X 10.7.4 (11E53)
Report Version: 9

Interval Since Last Report: 4266250 sec
Crashes Since Last Report: 41
Per-App Interval Since Last Report: 787353 sec
Per-App Crashes Since Last Report: 34
Anonymous UUID: --

Crashed Thread: 0 Dispatch queue: com.apple.main-thread

Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000

Application Specific Information:
objc[9000]: garbage collection is OFF
abort() called

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0 libsystem_kernel.dylib 0x935da9c6 pthread_kill + 10
1 libsystem_c.dylib 0x9342cf78 pthread_kill + 106
2 libsystem_c.dylib 0x9341dbdd abort + 167
3 Racket 0x0000e8ec scheme_out_of_memory_abort + 44
4 Racket 0x0026f309 out_of_memory + 25
5 Racket 0x002772d0 malloc_pages + 336
6 Racket 0x0027b0d2 allocate_big + 274
7 Racket 0x00260fc1 ffi_do_call + 1617
8 Racket 0x0005fdca scheme_do_eval + 10810
9 Racket 0x00062529 _scheme_apply_from_native + 105
10 ??? 0x0035860e 0 + 3507726
11 ??? 0x050f41f4 0 + 84886004
12 ??? 0x011ff190 0 + 18870672
13 Racket 0x0005ecfe scheme_do_eval + 6510
14 Racket 0x0007335c do_dyn_wind + 44
15 Racket 0x000862c5 scheme_dynamic_wind + 773
16 Racket 0x0008693e dynamic_wind + 318
17 ??? 0x003529d3 0 + 3484115
18 Racket 0x0005ecfe scheme_do_eval + 6510
19 Racket 0x0007f718 scheme_finish_apply_for_prompt + 680
20 Racket 0x0007f8cc scheme_apply_for_prompt + 108
21 Racket 0x0008a38f call_with_prompt + 1279
22 ??? 0x003529d3 0 + 3484115
23 Racket 0x0005ecfe scheme_do_eval + 6510
24 Racket 0x00062329 _scheme_apply_multi_from_native + 105
25 ??? 0x00357e9e 0 + 3505822
26 Racket 0x0005ecfe scheme_do_eval + 6510
27 Racket 0x0007f718 scheme_finish_apply_for_prompt + 680
28 Racket 0x0007f8cc scheme_apply_for_prompt + 108
29 Racket 0x0008a38f call_with_prompt + 1279
30 ??? 0x003529d3 0 + 3484115
31 Racket 0x0005ecfe scheme_do_eval + 6510
32 Racket 0x00062329 _scheme_apply_multi_from_native + 105
33 ??? 0x0035296c 0 + 3484012
34 Racket 0x0005ecfe scheme_do_eval + 6510
35 Racket 0x000780ba apply_k + 170
36 Racket 0x00077b1e scheme_top_level_do_worker + 766
37 Racket 0x00077d48 scheme_top_level_do + 40
38 Racket 0x0023742a do_next_will + 138
39 Racket 0x0023761f will_executor_go + 191
40 ??? 0x0035808a 0 + 3506314
41 Racket 0x0005ecfe scheme_do_eval + 6510
42 Racket 0x00062329 _scheme_apply_multi_from_native + 105
43 ??? 0x0035296c 0 + 3484012
44 Racket 0x0005ecfe scheme_do_eval + 6510
45 Racket 0x000780ba apply_k + 170
46 Racket 0x00077c78 scheme_top_level_do_worker + 1112
47 Racket 0x00077ee4 scheme_apply_thread_thunk + 116
48 Racket 0x00245c4d start_child + 973
49 Racket 0x00249b5d make_subprocess + 413
50 Racket 0x00249d96 scheme_thread_w_details + 326

Thread 1:
0 libsystem_kernel.dylib 0x935d8c22 mach_msg_trap + 10
1 libsystem_kernel.dylib 0x935d81f6 mach_msg + 70
2 Racket 0x00270052 exception_thread + 210
3 libsystem_c.dylib 0x9342aed9 _pthread_start + 335
4 libsystem_c.dylib 0x9342e6de thread_start + 34

Thread 2:
0 libsystem_kernel.dylib 0x935dae66 sigwait + 10
1 libsystem_c.dylib 0x933d67a5 sigwait + 25
2 Racket 0x001848f8 mz_proc_thread_signal_worker + 168
3 Racket 0x00140160 mzrt_thread_stub + 80
4 libsystem_c.dylib 0x9342aed9 _pthread_start + 335
5 libsystem_c.dylib 0x9342e6de thread_start + 34

Thread 3:
0 libsystem_kernel.dylib 0x935da83e psynch_cvwait + 10
1 libsystem_c.dylib 0x9342ee78 _pthread_cond_wait + 914
2 libsystem_c.dylib 0x933d682a pthread_cond_wait + 48
3 Racket 0x0018dbbf green_thread_timer + 143
4 Racket 0x00140160 mzrt_thread_stub + 80
5 libsystem_c.dylib 0x9342aed9 _pthread_start + 335
6 libsystem_c.dylib 0x9342e6de thread_start + 34

Thread 4:: Dispatch queue: com.apple.libdispatch-manager
0 libsystem_kernel.dylib 0x935db90a kevent + 10
1 libdispatch.dylib 0x9b5bbe10 _dispatch_mgr_invoke + 969
2 libdispatch.dylib 0x9b5ba85f _dispatch_mgr_thread + 53

Thread 5:: com.apple.CFSocket.private
0 libsystem_kernel.dylib 0x935dab42 select + 10
1 com.apple.CoreFoundation? 0x937dfe15
CFSocketManager + 1557
2 libsystem_c.dylib 0x9342aed9 _pthread_start + 335
3 libsystem_c.dylib 0x9342e6de thread_start + 34

Thread 6:
0 libsystem_kernel.dylib 0x935da83e psynch_cvwait + 10
1 libsystem_c.dylib 0x9342ee78 _pthread_cond_wait + 914
2 libsystem_c.dylib 0x933d682a pthread_cond_wait + 48
3 Racket 0x0018dc6c pt_sema_wait + 92
4 Racket 0x0018dd0b do_watch + 59
5 libsystem_c.dylib 0x9342aed9 _pthread_start + 335
6 libsystem_c.dylib 0x9342e6de thread_start + 34

Thread 0 crashed with X86 Thread State (32-bit):

eax: 0x00000000 ebx: 0x0000e8c9 ecx: 0xbfffad2c edx: 0x935da9c6
edi: 0xac3c02c0 esi: 0x00000006 ebp: 0xbfffad48 esp: 0xbfffad2c

ss: 0x00000023 efl: 0x00200246 eip: 0x935da9c6 cs: 0x0000000b
ds: 0x00000023 es: 0x00000023 fs: 0x00000000 gs: 0x0000000f

cr2: 0x02ede000

Logical CPU: 0

Binary Images:

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0x904aa000 - 0x904bdff8 com.apple.MultitouchSupport?.framework (231.4 - 231.4) <083F7787-4C3B-31DA-B5BB-1993D9A9723D> /System/Library/PrivateFrameworks/MultitouchSupport.framework/Versions/A/MultitouchSupport
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0x92e19000 - 0x92e7affb com.apple.audio.CoreAudio? (4.0.2 - 4.0.2) <AA6EAFB8-1C27-3D42-B1CD-3A1258C198D9> /System/Library/Frameworks/CoreAudio.framework/Versions/A/CoreAudio
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0x9ab31000 - 0x9ab53ff8 com.apple.PerformanceAnalysis? (1.11 - 11) <453463FF-7C42-3526-8C96-A9971EE07154> /System/Library/PrivateFrameworks/PerformanceAnalysis.framework/Versions/A/PerformanceAnalysis
0x9ab54000 - 0x9ab5cff3 libunwind.dylib (30.0.0 - compatibility 1.0.0) <E8DA8CEC-12D6-3C8D-B2E2-5D567C8F3CB5> /usr/lib/system/libunwind.dylib
0x9b5b8000 - 0x9b5b8ff2 com.apple.CoreServices? (53 - 53) <7CB7AA95-D5A7-366A-BB8A-035AA9E582F8> /System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
0x9b5b9000 - 0x9b5c7fff libdispatch.dylib (187.9.0 - compatibility 1.0.0) <2F918480-12C8-3F22-9B1A-9B2D76F6F4F5> /usr/lib/system/libdispatch.dylib
0x9b5c8000 - 0x9b5f0ff7 libxslt.1.dylib (3.24.0 - compatibility 3.0.0) <AB530FB2-8BD1-3328-95E8-CF449F0429CA> /usr/lib/libxslt.1.dylib
0x9b5f1000 - 0x9b8fbff3 com.apple.Foundation (6.7.2 - 833.25) <4C52ED74-A1FD-3087-A2E1-035AB3CF9610> /System/Library/Frameworks/Foundation.framework/Versions/C/Foundation
0x9b8fc000 - 0x9b90afff libz.1.dylib (1.2.5 - compatibility 1.0.0) <E73A4025-835C-3F73-9853-B08606E892DB> /usr/lib/libz.1.dylib
0x9bcde000 - 0x9bceffff libbsm.0.dylib (??? - ???) <54ACF696-87C6-3652-808A-17BE7275C230> /usr/lib/libbsm.0.dylib
0x9bcf0000 - 0x9bd0cffc libPng.dylib (??? - ???) <75F41C08-E187-354C-8115-79387F57FC2C> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ImageIO.framework/Versions/A/Resources/libPng.dylib
0x9bd4a000 - 0x9bd4bffd libCVMSPluginSupport.dylib (??? - ???) <22B85645-AA98-372B-BB55-55DCCF0EC716> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libCVMSPluginSupport.dylib
0x9be5b000 - 0x9be66ffc com.apple.NetAuth? (3.1 - 3.1) <CD89526E-4FF6-3BB3-A94E-832D4504AB1C> /System/Library/PrivateFrameworks/NetAuth.framework/Versions/A/NetAuth
0x9beb3000 - 0x9bfc3fe7 libsqlite3.dylib (9.6.0 - compatibility 9.0.0) <34E1E3CC-7B6A-3B37-8D07-1258D11E16CB> /usr/lib/libsqlite3.dylib
0x9c014000 - 0x9c123fff com.apple.DesktopServices? (1.6.3 - 1.6.3) <18CAAA9E-7065-3FF7-ACFE-CDB60E5426A2> /System/Library/PrivateFrameworks/DesktopServicesPriv.framework/Versions/A/DesktopServicesPriv
0x9c124000 - 0x9c128ff3 libsystem_network.dylib (??? - ???) <62EBADDA-FC72-3275-AAB3-5EDD949FEFAF> /usr/lib/system/libsystem_network.dylib
0x9c129000 - 0x9c182fff com.apple.HIServices (1.21 - ???) <5F4D3797-32E2-3709-85F4-4B56515A17D7> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/HIServices
0x9c197000 - 0x9c1b1fff com.apple.Kerberos (1.0 - 1) <D7920A1C-FEC4-3460-8DD0-D02491578CBB> /System/Library/Frameworks/Kerberos.framework/Versions/A/Kerberos
0x9c56d000 - 0x9c57dff7 libCRFSuite.dylib (??? - ???) <94E040D2-2769-359A-A21B-DB85FCB73BDC> /usr/lib/libCRFSuite.dylib
0x9c598000 - 0x9c5a3ffe libbz2.1.0.dylib (1.0.5 - compatibility 1.0.0) <B63F5D07-93B3-3F02-BFB7-472B4ED3521F> /usr/lib/libbz2.1.0.dylib
0x9c5a4000 - 0x9c631ff7 com.apple.CoreText? (220.20.0 - ???) <0C3EDD4F-6112-353A-8A3A-8D630182C22A> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreText.framework/Versions/A/CoreText
0x9c632000 - 0x9c673ff9 libcurl.4.dylib (7.0.0 - compatibility 7.0.0) <9FD420FB-7984-3A07-8914-BB19E687D38B> /usr/lib/libcurl.4.dylib
0x9c674000 - 0x9c76cff7 libFontParser.dylib (??? - ???) <1A0DA421-62B2-3AA7-9F62-0E01C1887D09> /System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/ATS.framework/Versions/A/Resources/libFontParser.dylib
0x9c76d000 - 0x9c770ffc libpam.2.dylib (3.0.0 - compatibility 3.0.0) <6FFDBD60-5EC6-3EFA-996B-EE030443C16C> /usr/lib/libpam.2.dylib
0x9c771000 - 0x9c779fff com.apple.DiskArbitration? (2.4.1 - 2.4.1) <28D5D8B5-14E8-3DA1-9085-B9BC96835ACF> /System/Library/Frameworks/DiskArbitration.framework/Versions/A/DiskArbitration
0x9ce26000 - 0x9ceb3fe7 libvMisc.dylib (325.4.0 - compatibility 1.0.0) <F2A8BBA3-6431-3CED-8CD3-0953410B6F96> /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libvMisc.dylib
0x9cf66000 - 0x9cf73fff libGL.dylib (??? - ???) <30E6DED6-0213-3A3B-B2B3-310E33301CCB> /System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib

External Modification Summary:

Calls made by other processes targeting this process:

task_for_pid: 2
thread_create: 0
thread_set_state: 0

Calls made by this process:

task_for_pid: 0
thread_create: 0
thread_set_state: 0

Calls made by all processes on this machine:

task_for_pid: 33467
thread_create: 0
thread_set_state: 0

VM Region Summary:
ReadOnly? portion of Libraries: Total=146.2M resident=41.3M(28%) swapped_out_or_unallocated=104.9M(72%)
Writable regions: Total=455.5M written=91.0M(20%) resident=135.4M(30%) swapped_out=344K(0%) unallocated=320.1M(70%)

REGION TYPE VIRTUAL
=========== =======
(null) (reserved) 69.2M reserved VM address space (unallocated)
ATS (font support) 32.9M
CG backing stores 9212K
CG image 316K
CG raster data 128K
CG shared images 3480K
CoreGraphics? 8K
CoreImage? 4K
CoreServices? 1824K
MALLOC 61.0M
MALLOC guard page 48K
Memory tag=240 4K
Memory tag=242 12K
OpenCL 8K
Stack 74.1M
VM_ALLOCATE 394.6M
CI_BITMAP 80K
DATA 8024K
DATA/OBJC 72K
IMAGE 528K
IMPORT 64K
LINKEDIT 43.3M
OBJC 1496K
PAGEZERO 4K
PLTSCHEME 8K
RC_CAMERAS 248K
TEXT 102.8M
UNICODE 544K
mapped file 202.7M
shared memory 312K
shared pmap 9.8M
=========== =======
TOTAL 1.0G
TOTAL, minus reserved VM space 947.1M

Model: MacBookAir?4,1, BootROM MBA41.0077.B0F, 2 processors, Intel Core i5, 1.6 GHz, 4 GB, SMC 1.74f1
Graphics: Intel HD Graphics 3000, Intel HD Graphics 3000, Built-In, 384 MB
Memory Module: BANK 0/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
Memory Module: BANK 1/DIMM0, 2 GB, DDR3, 1333 MHz, 0x80CE, 0x4D34373142353737334448302D4348392020
AirPort?: spairport_wireless_card_type_airport_extreme (0x14E4, 0xE9), Broadcom BCM43xx 1.0 (5.106.198.4.20)
Bluetooth: Version 4.0.5f11, 2 service, 18 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort?, en0
Serial ATA Device: APPLE SSD SM128C, 121.33 GB
USB Device: FaceTime? Camera (Built-in), apple_vendor_id, 0x850a, 0xfa200000 / 3
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfa100000 / 2
USB Device: Apple Internal Keyboard / Trackpad, apple_vendor_id, 0x024a, 0xfa120000 / 5
USB Device: BRCM20702 Hub, 0x0a5c (Broadcom Corp.), 0x4500, 0xfa110000 / 4
USB Device: Bluetooth USB Host Controller, apple_vendor_id, 0x821f, 0xfa113000 / 7
USB Device: hub_device, 0x0424 (SMSC), 0x2513, 0xfd100000 / 2

Change History

Changed 19 months ago by ryanc

  • status changed from new to accepted

Thanks for the bug report. Using the sample program you provided I'm able to reproduce the crash on my Linux box, although the C-level stacktrace seems to be different. I have not yet figured out what's causing the problem, though.

Changed 18 months ago by ryanc

  • status changed from accepted to closed
  • resolution set to fixed

I believe we've found and fixed the issue. Connection finalizers were relying on FFI resources that were sometimes collected before the finalizers ran. Matthew changed the FFI to raise an error instead of crashing when that happens, and I've changed the finalizers to hold onto their dependencies strongly. The fixes will be in the upcoming 5.3.1 release. Thanks again for the report!

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