Re: [Qemu-devel] Crashing in tcp_close

[Brian Candler]

On 07/11/2016 08:42, Brian Candler wrote:
> The following crashes occurred when running with a single vcpu. 
> Normally I have been running with -smp 8,sockets=1,cores=4,threads=2 
> as it seems to crash less with those settings; however I'm trying it 
> again like that in a loop to see if I can get a crash. 

On the next try I got another SCSI-related crash (see below).  I changed 
from virtio to virtio-scsi a little while ago so that I could get "trim" 
functionality.  So I'll now try with regular virtio and see if I can 
reproduce anything that way.

Regards,

Brian.

[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
Core was generated by `/usr/local/bin/qemu-system-x86_64 -device 
virtio-scsi-pci,id=scsi0 -device scsi'.
Program terminated with signal SIGABRT, Aborted.
#0  0x00007f1cbe351428 in __GI_raise (address@hidden) at 
../sysdeps/unix/sysv/linux/raise.c:54
54    ../sysdeps/unix/sysv/linux/raise.c: No such file or directory.
[Current thread is 1 (Thread 0x7f1cbfd71a80 (LWP 17371))]
(gdb) bt
#0  0x00007f1cbe351428 in __GI_raise (address@hidden) at 
../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007f1cbe35302a in __GI_abort () at abort.c:89
#2  0x00007f1cbe349bd7 in __assert_fail_base (fmt=<optimised out>,
    address@hidden "mr != NULL",
    address@hidden "/home/nsrc/qemu-2.7.0/exec.c", 
address@hidden,
    address@hidden <__PRETTY_FUNCTION__.42881> 
"address_space_unmap")
    at assert.c:92
#3  0x00007f1cbe349c82 in __GI___assert_fail (
    address@hidden "mr != NULL",
    address@hidden "/home/nsrc/qemu-2.7.0/exec.c", 
address@hidden,
    address@hidden <__PRETTY_FUNCTION__.42881> 
"address_space_unmap")
    at assert.c:101
#4  0x000055fc64cd6ffe in address_space_unmap (as=<optimised out>, 
buffer=<optimised out>,
    len=<optimised out>, is_write=1, access_len=4096) at 
/home/nsrc/qemu-2.7.0/exec.c:2967
#5  0x000055fc64d59beb in virtqueue_unmap_sg 
(address@hidden, address@hidden,
    vq=0x7f1bb8470110) at /home/nsrc/qemu-2.7.0/hw/virtio/virtio.c:254
#6  0x000055fc64d5a422 in virtqueue_fill (address@hidden,
    address@hidden, len=24684, address@hidden)
    at /home/nsrc/qemu-2.7.0/hw/virtio/virtio.c:282
#7  0x000055fc64d5a5db in virtqueue_push (address@hidden,
    address@hidden, len=<optimised out>)
    at /home/nsrc/qemu-2.7.0/hw/virtio/virtio.c:308
#8  0x000055fc64d47885 in virtio_scsi_complete_req (req=0x55fc6662d7a0)
    at /home/nsrc/qemu-2.7.0/hw/scsi/virtio-scsi.c:70
#9  0x000055fc64d479e6 in virtio_scsi_complete_cmd_req (req=0x55fc6662d7a0)
    at /home/nsrc/qemu-2.7.0/hw/scsi/virtio-scsi.c:443
#10 virtio_scsi_command_complete (r=<optimised out>, status=0, resid=0)
    at /home/nsrc/qemu-2.7.0/hw/scsi/virtio-scsi.c:470
#11 0x000055fc64ebcc98 in scsi_req_complete (req=0x55fc67044eb0, 
status=<optimised out>)
    at /home/nsrc/qemu-2.7.0/hw/scsi/scsi-bus.c:1775
#12 0x000055fc64eb7210 in scsi_dma_complete_noio (r=0x55fc67044eb0, 
ret=<optimised out>)
    at /home/nsrc/qemu-2.7.0/hw/scsi/scsi-disk.c:278
---Type <return> to continue, or q <return> to quit---
#13 0x000055fc64de8779 in dma_complete (ret=0, dbs=0x55fc66629e30)
    at /home/nsrc/qemu-2.7.0/dma-helpers.c:115
#14 dma_blk_cb (opaque=0x55fc66629e30, ret=0) at 
/home/nsrc/qemu-2.7.0/dma-helpers.c:137
#15 0x000055fc64f9625a in blk_aio_complete (acb=0x55fc662b70a0)
    at /home/nsrc/qemu-2.7.0/block/block-backend.c:923
#16 0x000055fc65005aea in coroutine_trampoline (i0=<optimised out>, 
i1=<optimised out>)
    at /home/nsrc/qemu-2.7.0/util/coroutine-ucontext.c:78
#17 0x00007f1cbe3665d0 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#18 0x00007fffb0541d10 in ?? ()
#19 0x2d2d2d2d2d2d2d2d in ?? ()
#20 0x00000000000000ec in ?? ()
#21 0x0000000000000000 in ?? ()
(gdb)