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Message-ID: <bug-124651-13602-8p0nfiWBQP@https.bugzilla.kernel.org/>
Date: Tue, 19 Jul 2016 01:39:03 +0000
From: bugzilla-daemon@...zilla.kernel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 124651] ext4 bugon panic when I mmap a file
https://bugzilla.kernel.org/show_bug.cgi?id=124651
--- Comment #2 from wangguang <35445233@...com> ---
fs/ext4/inode.c:2263:mpage_prepare_extent_to_map:
2261: lblk = ((ext4_lblk_t)page->index) <<
(PAGE_CACHE_SHIFT - blkbits);
2263: head = page_buffers(page);
EXT4 BUG_ON page_buffers() because a page goes to writeback without
buffer-heads attached.
I think unmap_page_range set the page dirty again Cause the problem。
I can recurrent the bug by:
(1) mmap a file
addr = (char *)mmap(NULL, MAPLEN, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
memset(addr, 'i', MAPLEN);
(2) return err at
ext4_writepages->mpage_map_and_submit_extent->mpage_map_one_extent Cause the
log:
ext4_msg(sb, KERN_CRIT,
"Delayed block allocation failed for "
"inode %lu at logical offset %llu with"
" max blocks %u with error %d",
inode->i_ino,
(unsigned long long)map->m_lblk,
(unsigned)map->m_len, -err);
(3) Unmap case warning:
WARNING: at fs/buffer.c:661 __set_page_dirty+0xaa/0xc0()
(4) wait for sync,then bugon
see the attachment please.
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