Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Hi Roger,

when client programs disconnect/terminate, the associated back end session would perform cleanup and then terminate itself too.

The fact that these assertions occur at client termination would indicate that some memory corruption is detected during session cleanup, within the respective sessions' memory pools (pool '328' when session 328 terminates, pool '379' for session 379).  Apparently the corruption hadn't caused any problem while the session still was operational, and at this final stage of the session none of these errors are (can be) reported back to the client (hence no client side errors).
As long as things stay this way, esp. corruptions remaining 'private' to sessions and sessions only corrupting their own session memory, the system probably will be able to handle these problems and no cross-session or server wide impact might occur, so the assertions will not be fatal and the server can continue normally.

Any further analysis belongs into a support case.  With some luck af files will be sufficient to determine a known defect's signature, otherwise a shared memory dump will be required or even some traces will have to be enabled (or added).
A core question will be: what's changed, on server and/or application side, that might be contributing to this; any new functionality being used, any new SQL constructs, etc...

HTH,
 Andreas

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Hi Andreas, thanks for your response.
The server has no changed, neither the application, as far as I have been able to review.
Currently, I have the following values related to shared memory dump, what values do you recommend ?

DUMPDIR $INFORMIXDIR/tmp
DUMPSHMEM 0
DUMPGCORE 0
DUMPCORE 0
DUMPCNT 10

Thanks,
Roger

Hi Roger,

when client programs disconnect/terminate, the associated back end session would perform cleanup and then terminate itself too.

The fact that these assertions occur at client termination would indicate that some memory corruption is detected during session cleanup, within the respective sessions' memory pools (pool '328' when session 328 terminates, pool '379' for session 379).  Apparently the corruption hadn't caused any problem while the session still was operational, and at this final stage of the session none of these errors are (can be) reported back to the client (hence no client side errors).
As long as things stay this way, esp. corruptions remaining 'private' to sessions and sessions only corrupting their own session memory, the system probably will be able to handle these problems and no cross-session or server wide impact might occur, so the assertions will not be fatal and the server can continue normally.

Any further analysis belongs into a support case.  With some luck af files will be sufficient to determine a known defect's signature, otherwise a shared memory dump will be required or even some traces will have to be enabled (or added).
A core question will be: what's changed, on server and/or application side, that might be contributing to this; any new functionality being used, any new SQL constructs, etc...

HTH,
 Andreas

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Hi Andreas, thanks for your response.
The server has no changed, neither the application, as far as I have been able to review.
Currently, I have the following values related to shared memory dump, what values do you recommend ?

DUMPDIR $INFORMIXDIR/tmp
DUMPSHMEM 0
DUMPGCORE 0
DUMPCORE 0
DUMPCNT 10

Thanks,
Roger

Hi Roger,

when client programs disconnect/terminate, the associated back end session would perform cleanup and then terminate itself too.

The fact that these assertions occur at client termination would indicate that some memory corruption is detected during session cleanup, within the respective sessions' memory pools (pool '328' when session 328 terminates, pool '379' for session 379).  Apparently the corruption hadn't caused any problem while the session still was operational, and at this final stage of the session none of these errors are (can be) reported back to the client (hence no client side errors).
As long as things stay this way, esp. corruptions remaining 'private' to sessions and sessions only corrupting their own session memory, the system probably will be able to handle these problems and no cross-session or server wide impact might occur, so the assertions will not be fatal and the server can continue normally.

Any further analysis belongs into a support case.  With some luck af files will be sufficient to determine a known defect's signature, otherwise a shared memory dump will be required or even some traces will have to be enabled (or added).
A core question will be: what's changed, on server and/or application side, that might be contributing to this; any new functionality being used, any new SQL constructs, etc...

HTH,
 Andreas

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Roger:

I am guessing that these ESQL/C applications are connecting to the server over shared memory, otherwise they are unlikely to be able to corrupt server memory. If so, you may be able to identify whether this is an application bug or a server bug by running the apps using a network connection. If the corruption is being caused by some server bug then changing to a networked connection type will not eliminate the issue in the server and you will still see those messages when the applications exit. If it is an application problem then the server messages will go away but the applications may begin to fail with their own memory issues instead. If that happens you may then be able to run them in a debugger and track the issue down.

Art

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger

--  Paul Watson Oninit www.oninit.com Tel: +1 913 364 0360 Cell: +1 913 387 7529  Oninit® is a registered trademark of Oninit LLC  If you want to improve, be content to be thought foolish and stupid Failure is not as frightening as regret

Hi,
I see messages as the following in online.log:

21:02:56  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:02:56  Pool '328' (0xc000000087ed8040)
21:02:56  Bad block header 0xc000000090c2ef70
21:02:56  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:02:56  IBM Informix Dynamic Server Version 12.10.FC15W1
21:02:56   Who: Session(328, informix@vpar3si, 10997, c0000000855fed40)
        Thread(493, sqlexec, c0000000855c74d0, 8)
        File: mtshpool.c Line: 2806
21:02:56   Results: Pool repaired
21:02:56   Action: Please notify IBM Informix Technical Support.
21:02:56  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56   See Also: /opt/informix12.10FC15W1/tmp/af.5d5fa50
21:02:56  Memory block header corruption detected in mt_shm_free 1
21:04:58  Found during mt_shm_free 1, error seen 1 times since last print to the log
21:04:58  Pool '379' (0xc000000088c27040)
21:04:58  Bad block header 0xc000000090a58000
21:04:58  Assert Warning: Memory block header corruption detected in mt_shm_free 1
21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Session(379, informix@vpar3si, 11059, c000000085603200)
        Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshpool.c Line: 2806
21:04:58   Results: Pool repaired
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory block header corruption detected in mt_shm_free 1
21:04:58  Assert Failed: Memory freed at bad boundary. 1 blocks at c000000090a58400

21:04:58  IBM Informix Dynamic Server Version 12.10.FC15W1
21:04:58   Who: Thread(546, sqlexec, c0000000855d1490, 8)
        File: mtshblk.c Line: 527
21:04:58   Results: Memory lost
21:04:58   Action: Please notify IBM Informix Technical Support.
21:04:58  stack trace for pid 10289 written to /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58   See Also: /opt/informix12.10FC15W1/tmp/af.60afaca
21:04:58  Memory freed at bad boundary. 1 blocks at c000000090a58400

I have realized that this messages  appear in online.log  just when a esql/c program exits (that means the C code say "exit(0);"). The program doesnt show any error.

Apparently it is not related to a particular esql/c program. I have not noticed if this was happening before, but recently this is having an impact because after some days the instance hang and the error: memory allocation failed is raised.

Please provide us any information about the possibles causes of this bug. I had searching in the web and I found similar errors, but these errors are supposedly corrected in the version 12.10FC15.

My environment:
HP-UX 11.31 64 bits
Informix Server 12.10FC15W1
CSDK 4.10.FC15

Regards,
Roger