From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 16312] WARNING: at fs/fs-writeback.c:1127 __mark_inode_dirty
Date: Mon, 26 Jul 2010 17:53:04 GMT
Message-ID: <201007261753.o6QHr4Gr004228@demeter.kernel.org>
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--- Comment #9 from Larry Finger 2010-07-26 17:53:04 ---
These patches break my system (the one reported in Bug #16122). It obviously is
different.
After installing the patches. I get a NULL pointer dereference for address 0x30
as __mark_inode_dirty + 0xf0/0x1a0 (x86_64 system). The code offset 0xf30. I
have a 2.6.35-rc6 kernel.
The assembler code around that address is
/home/finger/linux-temp/fs/fs-writeback.c:960
f28: 4d 8b ac 24 b0 01 00 mov 0x1b0(%r12),%r13
f2f: 00
/home/finger/linux-temp/fs/fs-writeback.c:962
f30: 41 f6 45 30 02 testb $0x2,0x30(%r13)
f35: 75 31 jne f68 <__mark_inode_dirty+0x128>
f37: 41 f6 45 28 10 testb $0x10,0x28(%r13)
f3c: 75 2a jne f68 <__mark_inode_dirty+0x128>
The code at line 960 is:
struct backing_dev_info *bdi = wb->bdi;
if (bdi_cap_writeback_dirty(bdi) &&
!test_bit(BDI_registered, &bdi->state)) {
WARN_ON(1);
printk(KERN_ERR "bdi-%s not registered\n",
bdi->name);
}
and wb->bdi is NULL.
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