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[Question] a qemu core occurs when the storage is disconnected.
From: |
wangjie (P) |
Subject: |
[Question] a qemu core occurs when the storage is disconnected. |
Date: |
Mon, 19 Apr 2021 22:08:22 +0800 |
User-agent: |
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.3.0 |
Hi all,
Recently, I did some convergence tests of VM lifecycles and storage anomalies.
Here is a question about the qemu core.
The VM configure disk of IP SAN storage device.
Call traceļ¼
#0 0x00007fbe9151877b in raise () from /usr/lib64/libc.so.6
#1 0x00007fbe91519aa1 in abort () from /usr/lib64/libc.so.6
#2 0x00007fbe9151103a in ?? () from /usr/lib64/libc.so.6
#3 0x00007fbe915110b2 in __assert_fail () from /usr/lib64/libc.so.6
#4 0x00007fbe9029baf8 in scsi_parse_sense_buf
(in_buf=in_buf@entry=0x7fbe18002870 "p", in_len=<optimized out>) at
/usr/src/debug/qemu-4.1.0-102.x86_64/scsi/utils.c:100
#5 0x00007fbe902a3980 in scsi_read_complete (opaque=0x7fbe18002800,
ret=<optimized out>) at
/usr/src/debug/qemu-4.1.0-102.x86_64/hw/scsi/scsi-generic.c:260
#6 0x00007fbe903227c7 in blk_aio_complete (acb=0x7fbe18003350) at
/usr/src/debug/qemu-4.1.0-102.x86_64/block/block-backend.c:1319
#7 0x00007fbe912a79b4 in coroutine_trampoline (i0=<optimized out>,
i1=<optimized out>) at
/usr/src/debug/qemu-4.1.0-102.x86_64/util/coroutine-ucontext.c:115
#8 0x00007fbe9152ce80 in ?? () from /usr/lib64/libc.so.6
#9 0x00007fbe29ffa4a0 in ?? ()
#10 0x0000000000000000 in ?? ()
Backtrace stopped: Cannot access memory at address 0x7fbdf1e00000
The scsi cmd requested in the core is inqury, the cmd is to call "
handle_aiocb_ioctl(void *opaque) ".
When the network is abnormal, the senses may not be obtained. This will cause "
r->io_header.sb_len_wr " is 0, qemu core occurs.
We can fix this bug by deleting " assert(in_len > 0); ".
Any better suggestion?
Thanks
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wangjie (P) <=