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[Qemu-devel] Fwd: qemu drive mirror assert fault
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] Fwd: qemu drive mirror assert fault |
Date: |
Thu, 30 Apr 2015 17:50:20 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
John, Fam,
I got this report offlist. This happens if a bit in the hbitmap is
cleared and the HBitmap has _not_ yet reached the bit. See this comment
in include/qemu/hbitmap.h:
* Resetting bits before the current
* position of the iterator is also okay. However, concurrent
* resetting of bits can lead to unexpected behavior if the iterator
* has not yet reached those bits.
Can you please take a look?
Thanks,
Paolo
-------- Forwarded Message --------
Subject: qemu drive mirror assert fault
Date: Wed, 29 Apr 2015 10:50:28 +0800
From: wangxiaolong <address@hidden>
To: pbonzini <address@hidden>
hello,
I used drive mirror to do live migration, and I run into such an assert
fault:
(gdb) bt
#0 0x00007fd2c6e678a5 in raise (sig=6) at
../nptl/sysdeps/unix/sysv/linux/raise.c:64
#1 0x00007fd2c6e69085 in abort () at abort.c:92
#2 0x00007fd2c6e60a1e in __assert_fail_base (fmt=<value optimized out>,
assertion=0x7fd2ca215aa0 "cur", file=0x7fd2ca215a78 "util/hbitmap.c",
line=<value optimized out>,
function=<value optimized out>) at assert.c:96
#3 0x00007fd2c6e60ae0 in __assert_fail (assertion=0x7fd2ca215aa0 "cur",
file=0x7fd2ca215a78 "util/hbitmap.c", line=129, function=0x7fd2ca215bf0
"hbitmap_iter_skip_words")
at assert.c:105
#4 0x00007fd2ca1b3bb8 in hbitmap_iter_skip_words (hbi=<value optimized
out>) at util/hbitmap.c:129
#5 0x00007fd2c9f8f8e0 in hbitmap_iter_next (opaque=0x7fd2cc59c730) at
/usr/src/debug/qemu-kvm-1.5.3/include/qemu/hbitmap.h:166
#6 mirror_iteration (opaque=0x7fd2cc59c730) at block/mirror.c:163
#7 mirror_run (opaque=0x7fd2cc59c730) at block/mirror.c:407
#8 0x00007fd2c9fc45bb in coroutine_trampoline (i0=<value optimized
out>, i1=<value optimized out>) at coroutine-ucontext.c:118
#9 0x00007fd2c6e78b70 in ?? () from /lib64/libc-2.12.so
#10 0x00007fff53eede80 in ?? ()
#11 0x0000000000000000 in ?? ()
and I just can’t figure out what is the cause of this situation,
could you help me figure it out, thanks!
- [Qemu-devel] Fwd: qemu drive mirror assert fault,
Paolo Bonzini <=