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Re: [Qemu-block] [Qemu-devel] [PULL 00/18] Block layer patches


From: Peter Maydell
Subject: Re: [Qemu-block] [Qemu-devel] [PULL 00/18] Block layer patches
Date: Wed, 28 Sep 2016 12:03:46 -0700

On 28 September 2016 at 02:37, Kevin Wolf <address@hidden> wrote:
> Am 27.09.2016 um 21:42 hat Peter Maydell geschrieben:
>> On 27 September 2016 at 06:53, Kevin Wolf <address@hidden> wrote:
>> > The following changes since commit 
>> > 7cfdc02dae0d2ff58c897496cfdbbafc0eda0f3f:
>> >
>> >   Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into 
>> > staging (2016-09-26 19:47:00 +0100)
>> >
>> > are available in the git repository at:
>> >
>> >
>> >   git://repo.or.cz/qemu/kevin.git tags/for-upstream
>> >
>> > for you to fetch changes up to 3b856cebe5e93547852c156ca2119d075e62aed7:
>> >
>> >   coroutine: reduce stack size to 60kB (2016-09-27 14:05:21 +0200)
>> >
>> > ----------------------------------------------------------------
>> > Block layer patches
>> >
>> > ----------------------------------------------------------------
>>
>> I see 'make check' failures on x86-64 host, clang Linux:
>>
>>   /i386/ahci/migrate/ncq/simple:                                       OK
>>   /i386/ahci/migrate/ncq/halted:                                       OK
>>   /i386/ahci/cdrom/dma/single:                                         OK
>>   /i386/ahci/cdrom/dma/multi:                                          OK
>>   /i386/ahci/cdrom/pio/single:
>> Broken pipe
>> FAIL
>> GTester: last random seed: R02Sa8f729848b07c3b3e5ee67368f9d0350
>> (pid=10590)
>>   /i386/ahci/cdrom/pio/multi:
>> Broken pipe
>> FAIL
>> GTester: last random seed: R02Se85704e04bbd382223983c878723b811
>> (pid=10598)
>> FAIL: tests/ahci-test
>> TEST: tests/hd-geo-test... (pid=10601)
>>   /i386/hd-geo/ide/none:                                               OK
>
> I asked on IRC, but as you don't seem to be around at the moment, I'll
> keep things on the list instead.

I got a gdb backtrace:

Thread 1 "qemu-system-i38" received signal SIGSEGV, Segmentation fault.
0x00005555561dea15 in address_space_translate (as=0x55555a46bfc0,
addr=1106048, xlat=0x7ffff7e0d050, plen=0x7ffff7e0d058,
    is_write=false) at /home/petmay01/linaro/qemu-for-merges/exec.c:423
423     {


Backtrace suggests we've run out of stack due to some infinite
recursion:

#0  0x00005555561dea15 in address_space_translate (as=0x55555a46bfc0,
addr=1106048, xlat=0x7ffff7e0d050, plen=0x7ffff7e0d058,
is_write=false) at /home/petmay01/linaro/qemu-for-merges/exec.c:423
#1  0x00005555561edeab in address_space_map (as=<optimised out>,
addr=1106048, plen=<optimised out>, is_write=false)
    at /home/petmay01/linaro/qemu-for-merges/exec.c:2909
#2  0x0000555556840b9b in ahci_populate_sglist (as=0x55555a46bfc0,
addr=1106048, dir=DMA_DIRECTION_TO_DEVICE, len=<optimised out>)
    at /home/petmay01/linaro/qemu-for-merges/include/sysemu/dma.h:135
#3  0x0000555556840b9b in ahci_populate_sglist (ad=<optimised out>,
sglist=<optimised out>, cmd=<optimised out>, limit=<optimised out>,
offset=1592) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:863
#4  0x0000555556844de4 in ahci_dma_prepare_buf (dma=0x55555a475b48,
limit=<optimised out>)
    at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1366
#5  0x000055555684354c in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1295
#6  0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#7  0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#8  0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#9  0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#10 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#11 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#12 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#13 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#14 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#15 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#16 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#17 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#18 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#19 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#20 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#21 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#22 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#23 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#24 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#25 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#26 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#27 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#28 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#29 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#30 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#31 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#32 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#33 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#34 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#35 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#36 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#37 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#38 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#39 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#40 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#41 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>) at
/home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318

[skip a lot of repeated stack frames]

#393 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#394 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#395 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#396 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#397 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#398 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#399 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#400 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#401 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#402 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#403 0x0000555556843662 in ahci_start_transfer (dma=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/ahci.c:1318
#404 0x00005555568250cb in ide_atapi_cmd_reply_end (s=<optimised out>)
at /home/petmay01/linaro/qemu-for-merges/hw/ide/atapi.c:324
#405 0x0000555556809cfc in ide_buffered_readv_cb
(opaque=0x5555594f57e0, ret=<optimised out>)
    at /home/petmay01/linaro/qemu-for-merges/hw/ide/core.c:605
#406 0x0000555556df7f73 in blk_aio_complete (acb=0x55555a4387c0) at
/home/petmay01/linaro/qemu-for-merges/block/block-backend.c:943
#407 0x0000555556f676f1 in coroutine_trampoline (i0=<optimised out>,
i1=<optimised out>)
    at /home/petmay01/linaro/qemu-for-merges/util/coroutine-ucontext.c:79
#408 0x00007fffdca05590 in __start_context () at /lib/x86_64-linux-gnu/libc.so.6
#409 0x00007fffffffc318 in  ()
#410 0x0000000000000000 in  ()


thanks
-- PMM



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