Re: Segmentation fault while COPY in 7.3 - Mailing list pgsql-general

Can I have a patch and would it work against 7.2.3.....

Thanks
Bruce Momjian wrote:

>Yes, we found a double pfree in 7.3.  There will be a fix in 7.3.1.
>
>---------------------------------------------------------------------------
>
>Medi Montaseri wrote:
>
>
>>Something is funny about this pfree()....here is a similar crash on a 7.2.3
>>
>>(gdb)
>>#0  0x00420874 in heap_freetuple ()
>>#1  0x004a8390 in acquire_sample_rows ()
>>#2  0x004a75c8 in analyze_rel ()
>>#3  0x0049f690 in vacuum ()
>>#4  0x005585d8 in ProcessUtility ()
>>#5  0x00553c78 in pg_exec_query_string ()
>>#6  0x00555850 in PostgresMain ()
>>#7  0x00524660 in DoBackend ()
>>#8  0x00523d08 in BackendStartup ()
>>#9  0x00521c18 in ServerLoop ()
>>#10 0x005211c8 in PostmasterMain ()
>>#11 0x004df3d8 in main ()
>>#12 0x2ae34928 in __libc_start_main () from /lib/libc.so.6
>>(gdb)
>>
>>
>>
>>Nicolai Tufar wrote:
>>
>>
>>
>>>Help!
>>>Backend crashes on any COPY command I issue:
>>>PostgreSQL is 7.3 release, is compiled from sources.
>>>The message I get is:
>>>
>>>apb=# COPY maras2.mrk_yyn (bsvr_no, yyn_tur, yyn_no, yyn_syf, yyn_trh) TO
>>>stdout;
>>>server closed the connection unexpectedly
>>>       This probably means the server terminated abnormally
>>>       before or while processing the request.
>>>The connection to the server was lost. Attempting reset: Failed.
>>>!#
>>>
>>>
>>>The output of strace on backend is following:
>>>
>>># strace -p 18883
>>>recv(7, "QCOPY maras2.mrk_yyn (bsvr_no, y"..., 8192, 0) = 77
>>>gettimeofday({1038713111, 629131}, NULL) = 0
>>>_llseek(11, 0, [0], SEEK_SET)           = 0
>>>read(11, "\0\0\0\0\20\0\0\0\1\0\0\0\24\0\360\37\360\37\1 b1\5\0\1"..., 8192)
>>>= 8192
>>>read(11, "\0\0\0\0x#\375\"\20\0\0\0008\0h\35\360\37\1 \370\235\220"...,
>>>8192) = 8192
>>>_llseek(12, 0, [0], SEEK_SET)           = 0
>>>read(12, "\0\0\0\0\0#\375\"\20\0\0\0008\0@\34\0 \1 \200\237\0\1\0"..., 8192)
>>>= 8192
>>>_llseek(21, 40960, [40960], SEEK_SET)   = 0
>>>read(21, "\0\0\0\0\4\251\3#\20\0\0\0004\4p\17\360\37\1 \340\237 "..., 8192)
>>>= 8192
>>>_llseek(22, 106496, [106496], SEEK_SET) = 0
>>>read(22, "\0\0\0\0(\326\377\"\20\0\0\0\10\1\200\1\0 \1 \200\237\0"..., 8192)
>>>= 8192
>>>read(17, "\0\0\0\0\20\0\0\0\1\0\0\0\360\0\20\1\0 \1 p\237 \1\340"..., 8192)
>>>= 8192
>>>open("/data/pgsql/base/2015749/2015757", O_RDWR|O_LARGEFILE) = 39
>>>_llseek(39, 0, [20037632], SEEK_END)    = 0
>>>_llseek(39, 0, [0], SEEK_SET)           = 0
>>>read(39, "\0\0\0\0\270\7\4#\20\0\0\0\300\1\350\1\0 \1 \270\237\216"...,
>>>8192) = 8192
>>>--- SIGSEGV (Segmentation fault) ---
>>>+++ killed by SIGSEGV +++
>>>#
>>>
>>>I have recompiled postgres with debug information enabled, run gdb, attached
>>>to backend process
>>>and caught SIGSEGV as following:
>>>
>>>(gdb) continue
>>>Continuing.
>>>
>>>Program received signal SIGSEGV, Segmentation fault.
>>>0x081697bf in pfree (pointer=0x828a7b0) at mcxt.c:480
>>>480             (*header->context->methods->free_p) (header->context,
>>>pointer);
>>>(gdb)
>>>
>>>
>>>The output of bt is:
>>>
>>>(gdb) bt
>>>#0  0x081697bf in pfree (pointer=0x828a7b0) at mcxt.c:480
>>>#1  0x080b37be in CopyTo (rel=0x402be088, attnumlist=0x828a3f8, binary=0
>>>'\0', oids=0 '\0',
>>>   fp=0x0, delim=0x81c2a57 "\t", null_print=0x81b2c22 "\\N") at copy.c:671
>>>#2  0x080b32f6 in DoCopy (stmt=0x827b398) at copy.c:491
>>>#3  0x08118a6a in pg_exec_query_string (query_string=0x827af48, dest=Remote,
>>>   parse_context=0x8245378) at postgres.c:789
>>>#4  0x08119b89 in PostgresMain (argc=4, argv=0xbfffd2a0, username=0x8240a81
>>>"postgres")
>>>   at postgres.c:2016
>>>#5  0x08101d7c in DoBackend (port=0x8240950) at postmaster.c:2293
>>>#6  0x081016c2 in BackendStartup (port=0x8240950) at postmaster.c:1915
>>>#7  0x08100875 in ServerLoop () at postmaster.c:1000
>>>#8  0x08100326 in PostmasterMain (argc=1, argv=0x82270c0) at
>>>postmaster.c:779
>>>#9  0x080debab in main (argc=1, argv=0xbfffdc34) at main.c:210
>>>#10 0x42017589 in __libc_start_main () from /lib/i686/libc.so.6
>>>(gdb)
>>>
>>>
>>>
>>>Thanks in advance,
>>>Nic
>>>
>>>
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