Date: Tue, 30 Aug 2016 23:55:26 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-fs@FreeBSD.org Subject: [Bug 212168] [panic] [UFS] use-after-free panic (0xdeadc0dedeadc0de) Message-ID: <bug-212168-3630-ygL9J9asRt@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-212168-3630@https.bugs.freebsd.org/bugzilla/> References: <bug-212168-3630@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D212168 --- Comment #10 from Kirk McKusick <mckusick@FreeBSD.org> --- It appears that there is an item on the worklist that has been prematurely freed. This freeing should be impossible as anything on a worklist has its ONWORKLIST flag set and the worklist freeing routine will panic if the ONWORKLIST flag is set. However I have written the following check to see i= f we are finding freed items on the worklist in softdep_disk_io_initiation(): Index: sys/ufs/ffs/ffs_softdep.c =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --- sys/ufs/ffs/ffs_softdep.c (revision 305057) +++ sys/ufs/ffs/ffs_softdep.c (working copy) @@ -9949,6 +9949,13 @@ if ((wk =3D LIST_FIRST(&bp->b_dep)) =3D=3D NULL) return; + if (wk->wk_type > D_LAST + 1) { + printf("dead worklist: %p next %p prev %p type %s state 0x%X\n", + wk, wk->wk_list.le_next, wk->wk_list.le_prev, + TYPENAME(wk->wk_type), wk->wk_state); + LIST_INIT(&bp->b_dep); + return; + } ump =3D VFSTOUFS(wk->wk_mp); marker.wk_type =3D D_LAST + 1; /* Not a normal workitem */ I would appreciate your running with this patch and reporting if you get the "dead worklist" error message. --=20 You are receiving this mail because: You are the assignee for the bug.=
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