I have a big application that uses pymongo and when I tried out the new MongoDB 2.0 I found that MongoDB server crashes during tests (which are mostly complex integration/lifecycle tests with high concurrency). The crash is consistent is that it always happens during tests, but not always at the same test. This happens on my development Windows 7 x64 machine (with 64-bit MongoDB server), unfortunately I haven't had the time to test it on Linux (that is used in production), these crashes kind of halted the whole idea of an upgrade at the moment.

I finally managed to look at it a little closer yesterday, and here's what gets written on the console at the time of the crash:

Mon Sep 19 16:56:00 [initandlisten] connection accepted from 127.0.0.1:55254 #6
Mon Sep 19 16:56:00 [conn6] dropDatabase app-tests-db
Mon Sep 19 16:56:01 [conn6] removeJournalFiles
Mon Sep 19 16:56:01 [conn6] command app-tests-db.$cmd command:

{ dropDatabase: 1 }

ntoreturn:1 reslen:70 339ms
Mon Sep 19 16:56:01 [conn5] build index app-tests-db.fs.chunks

{ _id: 1 }

Mon Sep 19 16:56:01 [conn5] build index done 0 records 0.001 secs
Mon Sep 19 16:56:01 [conn5] warning: best guess query plan requested, but scan and order are required for all plans query:

{ files_id: ObjectId('4e773be038d36e1210000094') }

order:

{ files_id: 1, n: 1 }

choices:

{ $natural: 1 }

unhandled windows exMon Sep 19 16:56:01 access violation
Mon Sep 19 16:56:18 [initandlisten] connection accepted from 127.0.0.1:55258 #7

The warning is GridFS related, but I'm not sure how relevant it is. Unfortunately minidump doesn't really help, because I don't have .pdb files for the server, and the only exported symbols are pcre-related, so stack trace is pretty useless:

0:011> .ecxr
rax=0000000003bfde60 rbx=000000000044eba0 rcx=0000000000000000
rdx=00000000004b2640 rsi=0000000000000000 rdi=00000000004a48b0
rip=000000013f8e1871 rsp=0000000003bfdd70 rbp=0000000003bfde70
r8=00000000007a9240 r9=00000000004b2640 r10=0000000003bfdd78
r11=00000000004b2640 r12=0000000000000000 r13=ffffffffffffffff
r14=0000000000000010 r15=0000000003bfe0d0
iopl=0 nv up ei pl nz na po nc
cs=0033 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00010206

• • • WARNING: Unable to verify checksum for mongod.exe
    • ERROR: Symbol file could not be found. Defaulted to export symbols for mongod.exe -
      mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x74a71:
      00000001`3f8e1871 488b01 mov rax,qword ptr [rcx] ds:00000000`00000000=????????????????
      [...]
      0:011> !analyze -v
      [...]
      STACK_TEXT:
      00000000`03bfdd70 00000001`3f9c66d7 : 00000000`00000004 00000000`00000004 00000000`03bfdfb8 00000000`03bfe6e0 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x74a71
      00000000`03bfdee0 00000001`3f9cd397 : 00000000`00000001 00000000`00000001 00000000`03bfe6e0 00000000`03bfecb0 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x1598d7
      00000000`03bfe2e0 00000001`3f9cd913 : 00000000`004ad640 00000000`004b45a5 00000000`03bfe750 00000000`004b6fa0 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x160597
      00000000`03bfe5e0 00000001`3f9a669e : 00000000`00000204 00000000`004b3100 00000000`00000000 00000001`3fa615bf : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x160b13
      00000000`03bfe800 00000001`3f9aa7f8 : 00000000`03bfecb0 00000000`00000000 00000000`004a95c0 00000000`03bfea98 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x13989e
      00000000`03bfe890 00000001`3f94f6d3 : 00000000`03bff250 ffffffff`fffffffe 000077f4`f8e4395f 00000000`007a0230 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x13d9f8
      00000000`03bff1d0 00000001`3f94fbb2 : 00000000`00000000 00000000`03bff769 00000000`03bff708 0000037f`00000003 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0xe28d3
      00000000`03bff400 00000001`3fa20990 : 00000000`00000000 00000000`004b4570 00000000`004a3e20 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0xe2db2
      00000000`03bff6d0 00000001`3f87e6e8 : 00000000`004a3e20 00000000`03bff848 00000000`004a3e20 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x1b3b90
      00000000`03bff7d0 00000001`3fa4d5d1 : 00000000`00362320 00000000`00362320 00000000`00000000 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x118e8
      00000000`03bff9c0 00000001`3fa6e5eb : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x1e07d1
      00000000`03bffa00 00000001`3fa6e67f : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x2017eb
      00000000`03bffa30 00000000`7757652d : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : mongod!pcrecpp::Arg::parse_ulonglong_cradix+0x20187f
      00000000`03bffa60 00000000`77b1c521 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : kernel32!BaseThreadInitThunk+0xd
      00000000`03bffa90 00000000`00000000 : 00000000`00000000 00000000`00000000 00000000`00000000 00000000`00000000 : ntdll!RtlUserThreadStart+0x1d

Is there a way to get pdb files for the build, or maybe some other way to help you figure out what's crashing so hard?