linux-kernel - ext4 2.6.35-rc2 regression (ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files)

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Date:	Sun, 6 Jun 2010 10:16:01 +0200
From:	Markus Trippelsdorf <markus@...ppelsdorf.de>
To:	linux-kernel@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, linux-ext4@...r.kernel.org,
	tytso@....edu
Subject: ext4 2.6.35-rc2 regression (ext4: Make sure the MOVE_EXT ioctl
 can't overwrite append-only files)

Commit 1f5a81e41f8b1a782c68d3843e9ec1bfaadf7d72
"ext4: Make sure the MOVE_EXT ioctl can't overwrite append-only files"
causes the following kernel BUG on my machine (x86_64):

BUG: Bad page map in process mpd  pte:720072000000000 pmd:11d2f7067
addr:00007f6b09f82000 vm_flags:08000070 anon_vma:(null) mapping:ffff88011b1cec18 index:132
vma->vm_ops->fault: filemap_fault+0x0/0x31e
vma->vm_file->f_op->mmap: ext4_file_mmap+0x0/0x54
Pid: 1672, comm: mpd Not tainted 2.6.35-rc2-00032-g78a5aa2 #45
Call Trace:
 [<ffffffff810b7a35>] print_bad_pte+0x1d0/0x1e9
 [<ffffffff810b8c9b>] unmap_vmas+0x50c/0x803
 [<ffffffff810be003>] exit_mmap+0xc4/0x14a
 [<ffffffff81057bc6>] mmput+0x2d/0xb9
 [<ffffffff8105b57f>] exit_mm+0x100/0x10d
 [<ffffffff81082165>] ? acct_collect+0x9f/0x180
 [<ffffffff8105cc6f>] do_exit+0x1fd/0x689
 [<ffffffff8105d1aa>] do_group_exit+0x75/0x9d
 [<ffffffff8105d1e9>] sys_exit_group+0x17/0x1b
 [<ffffffff8102b93b>] system_call_fastpath+0x16/0x1b
Disabling lock debugging due to kernel taint

Full dmesg is attached.
-- 
Markus

View attachment "dmesg_ext4" of type "text/plain" (61748 bytes)