Date: Sun, 3 Mar 1996 00:51:52 +1100 From: Bruce Evans <bde@zeta.org.au> To: jhay@mikom.csir.co.za, terry@lambert.org Cc: freebsd-current@FreeBSD.ORG Subject: Re: rename panics kernel Message-ID: <199603021351.AAA07828@godzilla.zeta.org.au>
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>> > Resently I got a "panic : vrele : negative reference count". >> > The vrele() was called from rename(). >> > >> > I tried a simple script to exercise rename (attached below) and a >> > current system seems to panic (trapped in ufs_rename). There's a race >> > ... >Tee Hee Hee. >I tried this on -current and my box panic'ed too. I couldn't duplicate this with my version of -current, but plain -current on an 8MB system gave: panic: vm_fork: u_map allocation failed and after rebooting it paniced in savecore: panic: bremfree: removing a buffer when not on a queue and on a 16MB system the mv script trapped for a null pointer: Stopped at _ufs_remove+0x15: movl 0x68(%ecx),%edi [%ecx = 0; %ecx is ap->a_vp] The fix is a side effect of my reordering for single-entry/single-exit and the semantic changes for the: It must be a side effect of something I've changed too :-). In ufs_rename(), I only changed most of the IN_CHANGE's to IN_MODIFIED. This stops the directory ctimes from being updated for failed renames. I don't think this would affect the bug. Bruce
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