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![]() During testing of the vhost-user-blk reconnect functionality the qemu SIGSEGV was triggered: start qemu as: x86_64-softmmu/qemu-system-x86_64 -m 1024M -M q35 \ -object memory-backend-file,id=ram-node0,size=1024M,mem-path=/dev/shm/qemu,share=on \ -numa node,cpus=0,memdev=ram-node0 \ -chardev socket,id=chardev0,path=./vhost.sock,noserver,reconnect=1 \ -device vhost-user-blk-pci,chardev=chardev0,num-queues=4 --enable-kvm start vhost-user-blk daemon: ./vhost-user-blk -s ./vhost.sock -b test-img.raw If vhost-user-blk will be killed during the vhost initialization process, for instance after getting VHOST_SET_VRING_CALL command, then QEMU will fail with the following backtrace: Thread 1 "qemu-system-x86" received signal SIGSEGV, Segmentation fault. 0x00005555559272bb in vhost_user_read (dev=0x7fffef2d53e0, msg=0x7fffffffd5b0) at ./hw/virtio/vhost-user.c:260 260 CharBackend *chr = u->user->chr; #0 0x00005555559272bb in vhost_user_read (dev=0x7fffef2d53e0, msg=0x7fffffffd5b0) at ./hw/virtio/vhost-user.c:260 #1 0x000055555592acb8 in vhost_user_get_config (dev=0x7fffef2d53e0, config=0x7fffef2d5394 "", config_len=60) at ./hw/virtio/vhost-user.c:1645 #2 0x0000555555925525 in vhost_dev_get_config (hdev=0x7fffef2d53e0, config=0x7fffef2d5394 "", config_len=60) at ./hw/virtio/vhost.c:1490 #3 0x00005555558cc46b in vhost_user_blk_device_realize (dev=0x7fffef2d51a0, errp=0x7fffffffd8f0) at ./hw/block/vhost-user-blk.c:429 #4 0x0000555555920090 in virtio_device_realize (dev=0x7fffef2d51a0, errp=0x7fffffffd948) at ./hw/virtio/virtio.c:3615 #5 0x0000555555a9779c in device_set_realized (obj=0x7fffef2d51a0, value=true, errp=0x7fffffffdb88) at ./hw/core/qdev.c:891 ... The problem is that vhost_user_write doesn't get an error after disconnect and try to call vhost_user_read(). The tcp_chr_write() routine should return -1 in case of disconnect. Indicate the EIO error if this routine is called in the disconnected state. Signed-off-by: Dima Stepanov <dimastep@yandex-team.ru> Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> Message-Id: <aeb7806bfc945faadf09f64dcfa30f59de3ac053.1590396396.git.dimastep@yandex-team.ru> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> |
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.. | ||
baum.c | ||
char-console.c | ||
char-fd.c | ||
char-fe.c | ||
char-file.c | ||
char-io.c | ||
char-mux.c | ||
char-null.c | ||
char-parallel.c | ||
char-pipe.c | ||
char-pty.c | ||
char-ringbuf.c | ||
char-serial.c | ||
char-socket.c | ||
char-stdio.c | ||
char-udp.c | ||
char-win-stdio.c | ||
char-win.c | ||
char.c | ||
Makefile.objs | ||
msmouse.c | ||
spice.c | ||
testdev.c | ||
trace-events | ||
wctablet.c |