Date: Tue, 21 Aug 2001 12:56:09 -0500 From: Alfred Perlstein <bright@mu.org> To: Rex Luo <rexluo@synology.com> Cc: hackers@FreeBSD.ORG Subject: Re: unpaired splbio() and splx() in vfs_unmountall() Message-ID: <20010821125609.F81307@elvis.mu.org> In-Reply-To: <200108210914.RAA02022@synology.com>; from rexluo@synology.com on Tue, Aug 21, 2001 at 05:14:51PM %2B0800 References: <200108210914.RAA02022@synology.com>
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* Rex Luo <rexluo@synology.com> [010821 04:14] wrote: > Dear, > > I modifid kernel to write to disk directly after unmount all mounted > filesystem in boot() kern/kern_shutdown.c. However, I found that my IO requests > wouldn't have callback from device interrupt routine. I traced the codes and use > gdb to find something out. The interesting is after execute > > vfs_unmountall() -> dounmount() -> ffs_unmount() -> ffs_flushfiles() -> > vflush()-> ??? the interrupt mask is set by splbio() without splx(), > therefore, all my following requests cannot return. > > Notice that, the situation only happens after heavy IO, for example: cp 30 files > at the same time. > > I use spl0() to solve the prolbem, but I think it's not the right way to do > that. Can anyone provide some clues or suggestions. That makes no sense. All you need to do is find the where the splbio() is that doesn't have a corresponding splx(). You can use the SPLASSERT functions to do that. -- -Alfred Perlstein [alfred@freebsd.org] Ok, who wrote this damn function called '??'? And why do my programs keep crashing in it? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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