Date: Thu, 16 Apr 1998 12:15:38 GMT From: PB <pb@wave.campus.luth.se> To: FreeBSD-gnats-submit@FreeBSD.ORG Subject: bin/6316: /bin/dd owerflows at 4 GB (4*2**30) Message-ID: <199804161215.MAA00830@wave.campus.luth.se>
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>Number: 6316 >Category: bin >Synopsis: Using 'dd' with byte amounts above 4 GB causes 'dd' to overflow >Confidential: no >Severity: non-critical >Priority: medium >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Thu Apr 16 03:30:00 PDT 1998 >Last-Modified: >Originator: PB >Organization: none >Release: FreeBSD 2.2-BETA_A i386 >Environment: (ncr0:3:0): "EXABYTE EXB-8500-85Qanx0 06X0" type 1 removable SCSI 2 st1(ncr0:3:0): Sequential-Access st1(ncr0:3:0): 4.0 MB/s (250 ns, offset 8) >Description: Tried this: dd if=/dev/zero of=/dev/rst1 bs=65536 70970+0 records in 70969+0 records out 356057088 bytes transferred in 9452.929942 secs (37666 bytes/sec) with a "EXABYTE 8MM Data Cartridge 2048" Exabyte specify the transfer rate to ~500 KB/s So this would give amount of transfered data to 340 MB on a exabyte tape.. But the records indicate 4.3 GB Seems not correct :-) Executing "dd if=/dev/zero of=/dev/null bs=1048576" and using and using "kill -29 <pid>" gives: 4042+0 records in 4042+0 records out 4238344192 bytes transferred in 100.735966 secs (42073793 bytes/sec) 4147+0 records in 4147+0 records out 53477376 bytes transferred in 103.401957 secs (517180 bytes/sec) Seems as 'st.bytes' in dd.h i declared as u_int64_t is giving: test_printf.c:20: warning: integer overflow in expression When the value is above "st.bytes = 1024*1024*2047 + 1024*1023 + 1023+0;" >How-To-Repeat: Use 'dd' on byte transfers above 4 GB. >Fix: Use your calculator and the 'record' numbers until fixed. >Audit-Trail: >Unformatted: To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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