From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49172) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fmfa9-0003JC-0q for qemu-devel@nongnu.org; Mon, 06 Aug 2018 09:29:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fmfa7-0008Gt-WA for qemu-devel@nongnu.org; Mon, 06 Aug 2018 09:29:57 -0400 Received: from mail-pg1-x536.google.com ([2607:f8b0:4864:20::536]:45777) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fmfa7-0008Gl-Oz for qemu-devel@nongnu.org; Mon, 06 Aug 2018 09:29:55 -0400 Received: by mail-pg1-x536.google.com with SMTP id f1-v6so6224119pgq.12 for ; Mon, 06 Aug 2018 06:29:55 -0700 (PDT) From: Lidong Chen Date: Mon, 6 Aug 2018 21:29:32 +0800 Message-Id: <1533562177-16447-7-git-send-email-lidongchen@tencent.com> In-Reply-To: <1533562177-16447-1-git-send-email-lidongchen@tencent.com> References: <1533562177-16447-1-git-send-email-lidongchen@tencent.com> Subject: [Qemu-devel] [PATCH v6 06/11] migration: invoke qio_channel_yield only when qemu_in_coroutine() List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: zhang.zhanghailiang@huawei.com, quintela@redhat.com, dgilbert@redhat.com Cc: qemu-devel@nongnu.org, Lidong Chen , Lidong Chen From: Lidong Chen when qio_channel_read return QIO_CHANNEL_ERR_BLOCK, the source qemu crash. The backtrace is: (gdb) bt #0 0x00007fb20aba91d7 in raise () from /lib64/libc.so.6 #1 0x00007fb20abaa8c8 in abort () from /lib64/libc.so.6 #2 0x00007fb20aba2146 in __assert_fail_base () from /lib64/libc.so.6 #3 0x00007fb20aba21f2 in __assert_fail () from /lib64/libc.so.6 #4 0x00000000008dba2d in qio_channel_yield (ioc=0x22f9e20, condition=G_IO_IN) at io/channel.c:460 #5 0x00000000007a870b in channel_get_buffer (opaque=0x22f9e20, buf=0x3d54038 "", pos=0, size=32768) at migration/qemu-file-channel.c:83 #6 0x00000000007a70f6 in qemu_fill_buffer (f=0x3d54000) at migration/qemu-file.c:299 #7 0x00000000007a79d0 in qemu_peek_byte (f=0x3d54000, offset=0) at migration/qemu-file.c:562 #8 0x00000000007a7a22 in qemu_get_byte (f=0x3d54000) at migration/qemu-file.c:575 #9 0x00000000007a7c46 in qemu_get_be16 (f=0x3d54000) at migration/qemu-file.c:647 #10 0x0000000000796db7 in source_return_path_thread (opaque=0x2242280) at migration/migration.c:1794 #11 0x00000000009428fa in qemu_thread_start (args=0x3e58420) at util/qemu-thread-posix.c:504 #12 0x00007fb20af3ddc5 in start_thread () from /lib64/libpthread.so.0 #13 0x00007fb20ac6b74d in clone () from /lib64/libc.so.6 This patch fixed by invoke qio_channel_yield only when qemu_in_coroutine(). Signed-off-by: Lidong Chen Reviewed-by: Juan Quintela --- migration/qemu-file-channel.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/migration/qemu-file-channel.c b/migration/qemu-file-channel.c index e202d73..8e639eb 100644 --- a/migration/qemu-file-channel.c +++ b/migration/qemu-file-channel.c @@ -49,7 +49,11 @@ static ssize_t channel_writev_buffer(void *opaque, ssize_t len; len = qio_channel_writev(ioc, local_iov, nlocal_iov, NULL); if (len == QIO_CHANNEL_ERR_BLOCK) { - qio_channel_wait(ioc, G_IO_OUT); + if (qemu_in_coroutine()) { + qio_channel_yield(ioc, G_IO_OUT); + } else { + qio_channel_wait(ioc, G_IO_OUT); + } continue; } if (len < 0) { @@ -80,7 +84,11 @@ static ssize_t channel_get_buffer(void *opaque, ret = qio_channel_read(ioc, (char *)buf, size, NULL); if (ret < 0) { if (ret == QIO_CHANNEL_ERR_BLOCK) { - qio_channel_yield(ioc, G_IO_IN); + if (qemu_in_coroutine()) { + qio_channel_yield(ioc, G_IO_IN); + } else { + qio_channel_wait(ioc, G_IO_IN); + } } else { /* XXX handle Error * object */ return -EIO; -- 1.8.3.1