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misaligned-pointer-use libslirp/src/tcp_input.c


From: Patrick Venture
Subject: misaligned-pointer-use libslirp/src/tcp_input.c
Date: Wed, 15 Jun 2022 09:42:58 -0700

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

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