On 220617 1217, Thomas Huth wrote: > On 16/06/2022 21.03, Alexander Bulekov wrote: > > On 220616 0930, Patrick Venture wrote: > > > On Thu, Jun 16, 2022 at 6:31 AM Alexander Bulekov <alx...@bu.edu> wrote: > > > > > > > Is this an --enable-sanitizers build? The virtual-device fuzzer catches > > > > > > > > > > Yeah - it should be reproducible with a sanitizers build from HEAD -- I > > > can > > > try to get a manual instance going again without automation to try and > > > reproduce it. We're testing on v7.0.0 which is when we started seeing > > > this, I don't think we saw it in 6.2.0. > > > > Here are a few reproducers (run with --enable-sanitizers): > > > > This one complains about misalignments in ip_header, ipasfrag, qlink, > > ip... > > > > cat << EOF | ./qemu-system-i386 -display none -machine accel=qtest, -m \ > > 512M,slots=4,maxmem=0xffff000000000000 -machine q35 -nodefaults -device \ > > vmxnet3,netdev=net0 -netdev user,id=net0 -object \ > > memory-backend-ram,id=mem1,size=10M -device \ > > pc-dimm,id=nv1,memdev=mem1,addr=0xba19ff00000000 -object \ > > memory-backend-ram,id=mem2,size=10M -device \ > > pc-dimm,id=nv2,memdev=mem2,addr=0xbe53e14abaa00000 -object \ > > memory-backend-ram,id=mem3,size=10M -device \ > > pc-dimm,id=nv3,memdev=mem3,addr=0xfe0000e9cae00000 -object \ > > memory-backend-ram,id=mem4,size=10M -device \ > > pc-dimm,id=nv4,memdev=mem4,addr=0xf0f0f0f00000000 -qtest stdio > > outl 0xcf8 0x80000810 > > outl 0xcfc 0xe0000000 > > outl 0xcf8 0x80000814 > > outl 0xcfc 0xe0001000 > > outl 0xcf8 0x80000804 > > outw 0xcfc 0x06 > > write 0x3e 0x1 0x02 > > write 0x39 0x1 0x20 > > write 0x29 0x1 0x10 > > write 0x2c 0x1 0x0f > > write 0x2d 0x1 0x0f > > write 0x2e 0x1 0x0f > > write 0x2f 0x1 0x0f > > write 0xf0f0f0f00001012 0x1 0xfe > > write 0xf0f0f0f00001013 0x1 0xca > > write 0xf0f0f0f00001014 0x1 0xe9 > > write 0xf0f0f0f00001017 0x1 0xfe > > write 0xf0f0f0f0000103a 0x1 0x01 > > write 0xfe0000e9cafe0009 0x1 0x40 > > write 0xfe0000e9cafe0019 0x1 0x40 > > write 0x0 0x1 0xe1 > > write 0x1 0x1 0xfe > > write 0x2 0x1 0xbe > > write 0x3 0x1 0xba > > writel 0xe0001020 0xcafe0000 > > write 0xfe0000e9cafe0029 0x1 0x40 > > write 0xfe0000e9cafe0039 0x1 0x40 > > write 0xfe0000e9cafe0049 0x1 0x40 > > write 0xfe0000e9cafe0059 0x1 0x40 > > write 0x1f65190b 0x1 0x08 > > write 0x1f65190d 0x1 0x46 > > write 0x1f65190e 0x1 0x03 > > write 0x1f651915 0x1 0x01 > > write 0xfe0000e9cafe0069 0x1 0x40 > > write 0xfe0000e9cafe0079 0x1 0x40 > > write 0xfe0000e9cafe0089 0x1 0x40 > > write 0xfe0000e9cafe0099 0x1 0x40 > > write 0xfe0000e9cafe009d 0x1 0x10 > > write 0xfe0000e9cafe00a0 0x1 0xff > > write 0xfe0000e9cafe00a1 0x1 0x18 > > write 0xfe0000e9cafe00a2 0x1 0x65 > > write 0xfe0000e9cafe00a3 0x1 0x1f > > write 0xfe0000e9cafe00a9 0x1 0x40 > > write 0xfe0000e9cafe00ad 0x1 0x1c > > write 0xe0000602 0x1 0x00 > > EOF > > > > This one complains about misalignments in ip6_header, ip6_hdrctl... > > > > cat << EOF | ./qemu-system-i386 -display none -machine accel=qtest, -m \ > > 512M,slots=1,maxmem=0xffff000000000000 -machine q35 -nodefaults -device \ > > vmxnet3,netdev=net0 -netdev user,id=net0 -object \ > > memory-backend-ram,id=mem1,size=4M -device \ > > pc-dimm,id=nv1,memdev=mem1,addr=0x1dd860000000000 -qtest stdio > > outl 0xcf8 0x80000810 > > outl 0xcfc 0xe0000000 > > outl 0xcf8 0x80000814 > > outl 0xcfc 0xe0001000 > > outl 0xcf8 0x80000804 > > outw 0xcfc 0x06 > > write 0x0 0x1 0xe1 > > write 0x1 0x1 0xfe > > write 0x2 0x1 0xbe > > write 0x3 0x1 0xba > > write 0x3e 0x1 0x01 > > write 0x39 0x1 0x01 > > write 0x28 0x1 0x01 > > write 0x29 0x1 0x01 > > write 0x2d 0x1 0x86 > > write 0x2e 0x1 0xdd > > write 0x2f 0x1 0x01 > > write 0x1dd860000000112 0x1 0x10 > > write 0x1dd86000000013c 0x1 0x02 > > writel 0xe0001020 0xcafe0000 > > write 0x1009 0x1 0x40 > > write 0x100c 0x1 0x86 > > write 0x100d 0x1 0xdd > > write 0x1011 0x1 0x10 > > write 0x1019 0x1 0x7e > > write 0x101d 0x1 0x10 > > write 0x4d56 0x1 0x02 > > write 0xe0000603 0x1 0x00 > > EOF > > Could you please open bugs on > https://gitlab.freedesktop.org/slirp/libslirp/-/issues so that this > information does not get lost?
Done: https://gitlab.freedesktop.org/slirp/libslirp/-/issues/62 https://gitlab.freedesktop.org/slirp/libslirp/-/issues/63 -Alex > > Thomas > > > > > > > > these periodically while fuzzing network-devices. However I don't think > > > > OSS-Fuzz creates reports for them for some reason. I can create qtest > > > > reproducers, if that is useful. > > > > -Alex > > > > > > > > On 220615 0942, Patrick Venture wrote: > > > > > Hey - I wanted to ask if someone else has seen this or has > > > > > suggestions on > > > > > how to fix it in libslirp / qemu. > > > > > > > > > > libslirp version: 3ad1710a96678fe79066b1469cead4058713a1d9 > > > > > > > > > > The blow is line: > > > > > > > > > https://gitlab.freedesktop.org/slirp/libslirp/-/blob/master/src/tcp_input.c#L310 > > > > > > > > > > I0614 13:44:44.304087 2040 bytestream.cc:22] QEMU: > > > > > third_party/libslirp/src/tcp_input.c:310:56: runtime error: member > > > > > access > > > > > within misaligned address 0xffff9a4000f4 for type 'struct qlink', > > > > > which > > > > > requires 8 byte alignment > > > > > I0614 13:44:44.304156 2040 bytestream.cc:22] QEMU: 0xffff9a4000f4: > > > > note: > > > > > pointer points here > > > > > I0614 13:44:44.304184 2040 bytestream.cc:22] QEMU: 00 00 00 00 > > > > > 00 00 > > > > > 00 02 20 02 0a 00 00 01 42 01 0a 00 02 02 42 01 0a 00 00 01 86 dd > > > > > 60 > > > > 02 > > > > > dd 79 > > > > > I0614 13:44:44.304204 2040 bytestream.cc:22] QEMU: ^ > > > > > I0614 13:44:44.641173 2040 bytestream.cc:22] QEMU: #0 > > > > 0xaaaacbe34bd8 > > > > > in tcp_input third_party/libslirp/src/tcp_input.c:310:56 > > > > > I0614 13:44:44.641239 2040 bytestream.cc:22] QEMU: #1 > > > > 0xaaaacbe22a94 > > > > > in ip6_input third_party/libslirp/src/ip6_input.c:74:9 > > > > > I0614 13:44:44.641262 2040 bytestream.cc:22] QEMU: #2 > > > > 0xaaaacbe0bbbc > > > > > in slirp_input third_party/libslirp/src/slirp.c:1169:13 > > > > > I0614 13:44:44.641280 2040 bytestream.cc:22] QEMU: #3 > > > > 0xaaaacbd55f6c > > > > > in net_slirp_receive third_party/qemu/net/slirp.c:136:5 > > > > > I0614 13:44:44.641296 2040 bytestream.cc:22] QEMU: #4 > > > > 0xaaaacbd4e77c > > > > > in nc_sendv_compat third_party/qemu/net/net.c > > > > > I0614 13:44:44.641323 2040 bytestream.cc:22] QEMU: #5 > > > > 0xaaaacbd4e77c > > > > > in qemu_deliver_packet_iov third_party/qemu/net/net.c:850:15 > > > > > I0614 13:44:44.641342 2040 bytestream.cc:22] QEMU: #6 > > > > 0xaaaacbd50bfc > > > > > in qemu_net_queue_deliver_iov third_party/qemu/net/queue.c:179:11 > > > > > I0614 13:44:44.641359 2040 bytestream.cc:22] QEMU: #7 > > > > 0xaaaacbd50bfc > > > > > in qemu_net_queue_send_iov third_party/qemu/net/queue.c:246:11 > > > > > I0614 13:44:44.641382 2040 bytestream.cc:22] QEMU: #8 > > > > 0xaaaacbd4a88c > > > > > in qemu_sendv_packet_async third_party/qemu/net/net.c:891:12 > > > > > I0614 13:44:44.641396 2040 bytestream.cc:22] QEMU: #9 > > > > 0xaaaacacb1de0 > > > > > in virtio_net_flush_tx third_party/qemu/hw/net/virtio-net.c:2586:15 > > > > > I0614 13:44:44.641416 2040 bytestream.cc:22] QEMU: #10 > > > > > 0xaaaacacb1580 in virtio_net_tx_bh > > > > > third_party/qemu/hw/net/virtio-net.c:2703:11 > > > > > I0614 13:44:44.641438 2040 bytestream.cc:22] QEMU: #11 > > > > > 0xaaaacc2bcf64 in aio_bh_call third_party/qemu/util/async.c:142:5 > > > > > I0614 13:44:44.641463 2040 bytestream.cc:22] QEMU: #12 > > > > > 0xaaaacc2bcf64 in aio_bh_poll third_party/qemu/util/async.c:170:13 > > > > > I0614 13:44:44.641477 2040 bytestream.cc:22] QEMU: #13 > > > > > 0xaaaacc2b8f70 in aio_dispatch third_party/qemu/util/aio-posix.c:420:5 > > > > > I0614 13:44:44.641495 2040 bytestream.cc:22] QEMU: #14 > > > > > 0xaaaacc2bf120 in aio_ctx_dispatch third_party/qemu/util/async.c:312:5 > > > > > I0614 13:44:44.641510 2040 bytestream.cc:22] QEMU: #15 > > > > > 0xaaaacc3a7690 in g_main_dispatch > > > > > third_party/glib/glib/gmain.c:3417:27 > > > > > I0614 13:44:44.641525 2040 bytestream.cc:22] QEMU: #16 > > > > > 0xaaaacc3a7690 in g_main_context_dispatch > > > > > third_party/glib/glib/gmain.c:4135:7 > > > > > I0614 13:44:44.641546 2040 bytestream.cc:22] QEMU: #17 > > > > > 0xaaaacc2de3ec in glib_pollfds_poll > > > > third_party/qemu/util/main-loop.c:232:9 > > > > > I0614 13:44:44.641562 2040 bytestream.cc:22] QEMU: #18 > > > > > 0xaaaacc2de3ec in os_host_main_loop_wait > > > > > third_party/qemu/util/main-loop.c:255:5 > > > > > I0614 13:44:44.641580 2040 bytestream.cc:22] QEMU: #19 > > > > > 0xaaaacc2de3ec in main_loop_wait > > > > > third_party/qemu/util/main-loop.c:531:11 > > > > > I0614 13:44:44.641598 2040 bytestream.cc:22] QEMU: #20 > > > > > 0xaaaacbd82798 in qemu_main_loop > > > > third_party/qemu/softmmu/runstate.c:727:9 > > > > > I0614 13:44:44.641612 2040 bytestream.cc:22] QEMU: #21 > > > > > 0xaaaacadacb5c in main > > > > > > > > > > Patrick > > > > > > >