Hi, We are having squid crash a few times and creating Watson dumps when user clears cache. We do stop the squid ( using Terminate Process), clean the cache and restart it. This happens on field and we don't have much info. The crash however seems to point to the squid source.. We are using Squid version 2.5 STABLE 9. Is this a known issue on this version? I tried searching on the release notes for this version and also on Squid version 2.6 release notes but couldn't find any reference to this. Can anyone please help us out on what might be the cause and help resolve it. Details of the crash is as below: FAULTING_IP: ventcsquid!ipc_thread_1+21e7 [\squid-2.5.STABLE9-NT-CVS\src\ipc.c @ 801] 0044c145 ?? ??? EXCEPTION_RECORD: ffffffff -- (.exr 0xffffffffffffffff) ExceptionAddress: 0044c145 (ventcsquid!ipc_thread_1+0x000021e7) ExceptionCode: c0000005 (Access violation) ExceptionFlags: 00000000 NumberParameters: 2 Parameter[0]: 00000000 Parameter[1]: 2af1b8a8 Attempt to read from address 2af1b8a8 PROCESS_NAME: ventcsquid.exe ADDITIONAL_DEBUG_TEXT: Use '!findthebuild' command to search for the target build information. If the build information is available, run '!findthebuild -s ; .reload' to set symbol path and load symbols. FAULTING_MODULE: 7c900000 ntdll DEBUG_FLR_IMAGE_TIMESTAMP: 49a64ee1 ERROR_CODE: (NTSTATUS) 0xc0000005 - The instruction at "0x%08lx" referenced memory at "0x%08lx". The memory could not be "%s". EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at "0x%08lx" referenced memory at "0x%08lx". The memory could not be "%s". EXCEPTION_PARAMETER1: 00000000 EXCEPTION_PARAMETER2: 2af1b8a8 READ_ADDRESS: 2af1b8a8 FOLLOWUP_IP: ventcsquid!ipc_thread_1+21e7 [C:\VClient_4.5.1_9thFeb\vent2\squid\client\squid-2.5.STABLE9-NT-CVS\src \ipc.c @ 801] 0044c145 ?? ??? FAULTING_THREAD: 00001030 BUGCHECK_STR: APPLICATION_FAULT_INVALID_POINTER_READ_WRONG_SYMBOLS PRIMARY_PROBLEM_CLASS: INVALID_POINTER_READ DEFAULT_BUCKET_ID: INVALID_POINTER_READ IP_ON_HEAP: 00b30650 FRAME_ONE_INVALID: 1 LAST_CONTROL_TRANSFER: from 00b30650 to 0044c145 STACK_TEXT: 00ecfbd0 00b30650 00000001 00000009 00000001 ventcsquid!ipc_thread_1+0x21e7 [C:\VClient_4.5.1_9thFeb\vent2\squid\client\squid-2.5.STABLE9-NT-CVS\src \ipc.c @ 801] WARNING: Frame IP not in any known module. Following frames may be wrong. 00ecff7c 00493957 0012fd14 0000007c 00000000 0xb30650 00ecffb4 7c80b713 00b30650 0000007c 00000000 ventcsquid!_beginthreadex+0xf4 00ecffec 00000000 004938ce 00b30650 00000000 kernel32!GetModuleFileNameA+0x1b4 STACK_COMMAND: ~3s; .ecxr ; kb FAULTING_SOURCE_CODE: 797: 798: cleanup: 799: if (c2p[1] != -1) 800: close(c2p[1]); > 801: if (fd_table[crfd].flags.open) 802: ipcCloseAllFD(-1, -1, crfd, cwfd); 803: if (prfd_ipc != -1) { 804: send(crfd_ipc, shutdown_string, strlen(shutdown_string), 0); 805: shutdown(crfd_ipc, SD_BOTH); 806: shutdown(prfd_ipc, SD_BOTH); SYMBOL_STACK_INDEX: 0 SYMBOL_NAME: ventcsquid!ipc_thread_1+21e7 FOLLOWUP_NAME: MachineOwner MODULE_NAME: ventcsquid IMAGE_NAME: ventcsquid.exe BUCKET_ID: WRONG_SYMBOLS WATSON_IBUCKET: 360931898 WATSON_IBUCKETTABLE: 1 FAILURE_BUCKET_ID: INVALID_POINTER_READ_c0000005_ventcsquid.exe!ipc_thread_1 Thanks Balaji