Date: Wed, 14 May 2003 10:09:11 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Bogdan TARU <bgd@icomag.de> Cc: freebsd-hackers@freebsd.org Subject: Re: linux binary blues Message-ID: <20030514150911.GI65927@dan.emsphone.com> In-Reply-To: <20030514131951.O78837-100000@fw.office.icom> References: <20030514131951.O78837-100000@fw.office.icom>
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In the last episode (May 14), Bogdan TARU said: > I have a linux binary that runs well under a jail on a FreeBSD 4.8, > but fails to run on a jaili on 4.7 (obviously, both have linux > compatibility installed). > > As far as I know (don't have the sources of this linux binary), it > tries to get a lock on a file which is called engine.pid. That failes > on 4.7. > > The ktraces on the systems look like: BTW - it didn't matter in this case, but make sure you use the linux_kdump program (in the ports tree) when dumping traces from Linux executables. Some syscalls have different numbers under Linux and FreeBSD. > Good (jail on 4.8): > > 582 engine NAMI "/home/test/testbot/var/run/engine.pid" > 582 engine RET open 3 > 582 engine CALL semget(0x3,0x6,0xbfbfe820) > 582 engine RET semget 0 > 582 engine CALL getpid > 582 engine RET getpid 582/0x246 > 582 engine CALL select(0x3,0) > 582 engine RET select 0 > 582 engine CALL write(0x3,0x864c28c,0x4) > 582 engine GIO fd 3 wrote 4 bytes > > Failed (jail on 4.7): > > 10995 engine NAMI "/usr/home/ohsandy/sandy/var/run/engine.pid" > 10995 engine RET open 3 > 10995 engine CALL semget(0x3,0x6,0xbfbfe800) > 10995 engine RET semget -1 errno -22 Unknown error: -22( Do you have sysv semaphores enabled on this box? Put this in your kernel config file and rebuild: options SYSVSEM > I don't know, though, why the semget(2) has different values for the > third argument (0xbfbfe820 != 0xbfbfe800), if the binary is the same and > the linux libraries (as far as I can tell) are the same (tried with the > 4.7 linux_base package, and as well with the 4.8 linux_base package > installed on the 4.7 system). The third argument is a pointer value, so it's probably going to be different every time. -- Dan Nelson dnelson@allantgroup.com
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