Date: Fri, 02 Sep 2016 23:13:07 +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-KhTuEcXaUn@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 #13 from Glen Barber <gjb@FreeBSD.org> --- (In reply to Kirk McKusick from comment #10) > 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= if > we are finding freed items on the worklist in softdep_disk_io_initiation(= ): >=20 > 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 @@ >=20=20 > 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); >=20=20 > marker.wk_type =3D D_LAST + 1; /* Not a normal workitem */ >=20 > I would appreciate your running with this patch and reporting if you get = the > "dead worklist" error message. I do not know what information you want from ddb, and I never thought I'd e= ver say this, but "yay, the machine finally crashed again." I will leave the machine in its current state unless instructed otherwise. dead worklist: 0xfffffd080edd5400 next 0xdeadc0dedeadc0de prev 0xdeadc0dedeadc0de type ??? state 0xDEADC0 panic: Bad link elm 0xfffffd00b7e0ba00 prev->next !=3D elm Please let me know what additional information you want. --=20 You are receiving this mail because: You are the assignee for the bug.=
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