Date: Fri, 7 Apr 2017 13:40:46 +0200 From: Peter Blok <pblok@bsd4all.org> To: freebsd-stable@freebsd.org Subject: panic in pfcioctl Message-ID: <86468517-69FF-4398-8FA9-0D7045CDD32B@bsd4all.org>
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Hi, I=E2=80=99m running 11-STABLE rev 316522. I recently had a panic while doing a pfctl -f /etc/pf.conf The panic happens on LIST_REMOVE in keg_fetch_slab static uma_slab_t keg_fetch_slab(uma_keg_t keg, uma_zone_t zone, int flags) { uma_slab_t slab; int reserve; mtx_assert(&keg->uk_lock, MA_OWNED); slab =3D NULL; reserve =3D 0; if ((flags & M_USE_RESERVE) =3D=3D 0) reserve =3D keg->uk_reserve; for (;;) { /* * Find a slab with some space. Prefer slabs that are = partially * used over those that are totally full. This helps to = reduce * fragmentation. */ if (keg->uk_free > reserve) { if (!LIST_EMPTY(&keg->uk_part_slab)) { slab =3D LIST_FIRST(&keg->uk_part_slab); } else { slab =3D LIST_FIRST(&keg->uk_free_slab); LIST_REMOVE(slab, us_link); LIST_INSERT_HEAD(&keg->uk_part_slab, = slab, us_link); } MPASS(slab->us_keg =3D=3D keg); return (slab); } KDB: stack backtrace: #0 0xffffffff805df0e7 at kdb_backtrace+0x67 #1 0xffffffff8059d176 at vpanic+0x186 #2 0xffffffff8059cfe3 at panic+0x43 #3 0xffffffff808ebaa2 at trap_fatal+0x322 #4 0xffffffff808ebaf9 at trap_pfault+0x49 #5 0xffffffff808eb336 at trap+0x286 #6 0xffffffff808d1441 at calltrap+0x8 #7 0xffffffff808a871e at zone_fetch_slab+0x6e #8 0xffffffff808a87cd at zone_import+0x4d #9 0xffffffff808a4fc9 at uma_zalloc_arg+0x529 #10 0xffffffff80803214 at pfr_ina_define+0x584 #11 0xffffffff807f0734 at pfioctl+0x3364 #12 0xffffffff80469288 at devfs_ioctl_f+0x128 #13 0xffffffff805fa925 at kern_ioctl+0x255 #14 0xffffffff805fa65f at sys_ioctl+0x16f #15 0xffffffff808ec604 at amd64_syscall+0x6c4 #16 0xffffffff808d172b at Xfast_syscall+0xfb The panic is not reproducible. So far the 1st time I stop a jail I get (numbers vary) kernel: Freed UMA keg (pf table entries) was not empty (32 items). Lost = -57 pages of memory. Any tips on how to debug/avoid this? Peter=
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