Python interpreters in threads crash the application

grbgooglefan ganeshborse at gmail.com
Wed Apr 15 04:24:49 EDT 2009 

I have C application in which I have instantiated Python interpreter
in each worker thread.

When I start the program it crashes at different places in Python code
but program never finishes normally.

One such core dump is given below.

Can you please help me in following queries?
1) Can we not use Python interpreters per thread instead of having a
common shared Python interpreter at global level/ scope?
2) Why is this crash happening? Do I need to use locks in Python
interpreter?
 Will that make the multiple threads work in serialized way?

--------------------------------------------------------------------------------
pflags core:-
        data model = _ILP32  flags = MSACCT|MSFORK
 /1:    flags = STOPPED
        why = PR_SUSPENDED
 /2:    flags = STOPPED
        why = PR_SUSPENDED
 /3:    flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
 /4:    flags = 0
        sigmask = 0xffffbefc,0x0000ffff  cursig = SIGSEGV
 /5:    flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
 /6:    flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
 /7:    flags = STOPPED  lwp_mutex_timedlock(0xff3f0a10,0x0)
        why = PR_SUSPENDED
 /8:    flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
 /9:    flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
 /10:   flags = STOPPED
        why = PR_SUSPENDED
 /11:   flags = STOPPED  lwp_park(0x4,0x0,0x0)
        why = PR_SUSPENDED
--------------------------------------------------------------------------------
pstack core:
-----------------  lwp# 1 / thread# 1  --------------------
 000110e8 main     (1, ffbff2d4, ffbff2dc, 21400, feec0200, feec0240)
+ 50
 00010c10 _start   (0, 0, 0, 0, 0, 0) + 108
-----------------  lwp# 2 / thread# 2  --------------------
 ff20877c string_dealloc (fed7bbfc, 53bc, ff2f6ba0, e40e0, ff2f6ba0,
ff2dec08)
 ff213b44 PyString_InternFromString (ff316e68, 0, 0, ff316e68, e40c0,
2000) + 20
 ff2262f8 init_slotdefs (b8964, 0, 2000, 2204, 0, 0) + 58
 ff2266b8 add_operators (ff2f76c0, 1c00, b8568, 5000, 2000, 21b0) + 1c
 ff21fe28 PyType_Ready (ff2f76c0, bef10, 0, 0, 5124, 0) + 134
 ff21fd88 PyType_Ready (ff2f7438, 1, de358, ff3b3904, 5124, 5284) + 94
 ff2008c8 _Py_ReadyTypes (0, ff308ea4, 121c20, fefc6964, 21788,
ff06b3d4) + 1c
 ff287cc8 Py_InitializeEx (0, 0, 4000, 0, 0, ff2dec08) + 234
 00010c4c __1cMinterpthread6Fpv_0_ (0, fed7c000, 0, 0, 10c38, 0) + 14
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 3 / thread# 3  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff02415c _flockget (ff06c348, 21878, 441b4, ff3b3904, ff06c308,
21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fec7c000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 4 / thread# 4  --------------------
 fefb0c90 strlen   (ff2bdee8, feafbcf4, 4000, 73, 2e, 4000) + 50
 ff274924 PyErr_Format (ff2ebb2c, ff2bdee8, 0, 1400, 1780, ff2dec08) +
18
 ff1feeb8 PyObject_HashNotImplemented (e4020, 0, 5000, 53bc, ff2f6ba0,
0) + 34
 ff1f8420 PyDict_GetItem (23a50, e4020, 20000000, cb28c, ff2dec08, 0)
+ 64
 ff213a2c PyString_InternInPlace (feafbe3c, 53bc, ff2f6ba0, e4020,
ff2f6ba0, ff2dec08) + b4
 ff1fb6b4 PyDict_SetItemString (239c0, 114a3, e3030, 21896, ff2dec08,
1b) + 20
 00010cd8 __1cMinterpthread6Fpv_0_ (0, feafc000, 0, 0, 10c38, 0) + a0
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 5 / thread# 5  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff02415c _flockget (ff06c348, 21878, 441b4, 0, ff06c308, 21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe9fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 6 / thread# 6  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff02415c _flockget (ff06c348, 21878, 441b4, ff29afcc, ff06c308,
21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe8fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 7 / thread# 7  --------------------
 ff3d7e68 ___lwp_mutex_timedlock (0, 1, ff3c3f98, ff3ee980, 2ae64,
ff3ee268) + c
 ff3cc60c elf_bndr (ff3f1b98, 132c, ff1f0840, e3030, ff3f06d0, 0) + 28
 ff3b3904 elf_rtbndr (ff1f0840, 3d, 1, 92492400, ff2f339c, 8) + 10
 ff2e4060 ???????? (e3020, ff2f2314, 0, 0, 0, 0)
 ff1f0840 PyLong_FromLong (0, 21878, ff06c348, 21896, ff2dec08, 1b) +
44
 00010cc8 __1cMinterpthread6Fpv_0_ (0, fe7fc000, 0, 0, 10c38, 0) + 90
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 8 / thread# 8  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff038db0 mutex_lock_internal (ff06c348, 0, 1, 0, 10, ff06cbc0) + 5d0
 ff02415c _flockget (ff06c348, 21878, 441b4, ff29afcc, ff06c308,
21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe6fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 9 / thread# 9  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff038db0 mutex_lock_internal (ff06c348, 0, 1, 0, 10, ff06cbc0) + 5d0
 ff02415c _flockget (ff06c348, 21878, 441b4, ff29afcc, ff06c308,
21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe5fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 10 / thread# 10  --------------------
 ff06a64c ???????? (21888, 42, ffffffe5, 7, ff070513, ffffffe5)
 ff0183fc printf   (112a4, 21878, ff06c348, 21896, ff068284, ff2dec08)
+ f4
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe4fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)
-----------------  lwp# 11 / thread# 11  --------------------
 ff040154 __lwp_park (0, 0, ff06c348, 0, 0, 1) + 14
 ff038db0 mutex_lock_internal (ff06c348, 0, 1, 0, 10, ff06cbc0) + 5d0
 ff02415c _flockget (ff06c348, 21878, 441b4, ff29afcc, ff06c308,
21878) + 94
 ff018364 printf   (112a4, 21878, 0, 21896, ff068284, ff2dec08) + 5c
 00010c8c __1cMinterpthread6Fpv_0_ (0, fe3fc000, 0, 0, 10c38, 0) + 54
 ff0400b0 _lwp_start (0, 0, 0, 0, 0, 0)

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