msync() oops in 2.6.7-rc2-bk1

[Miquel van Smoorenburg]

I'm running a news server. The innd process uses mmap()s for several
files and uses msync() to force synchronization to disk every so
often. Suddenly, an msync() causes an oops (and innd SEGVs). This
is after the box has been up and running for 3 days:

# uname -a
Linux enterprise 2.6.7-rc2-bk1 #1 Mon May 31 15:03:52 CEST 2004 i686 GNU/Linux

 <1>Unable to handle kernel NULL pointer dereference at virtual address 00000000 printing eip:
c0149120
*pde = 00000000
Oops: 0002 [#5]
Modules linked in: e100 mii
CPU:    0
EIP:    0060:[<c0149120>]    Not tainted
EFLAGS: 00010213   (2.6.7-rc2-bk1)
EIP is at __set_page_dirty_buffers+0x20/0xb0
eax: 00000000   ebx: f77a1e7c   ecx: c15706e0   edx: eba5a83c
esi: 5ccfb000   edi: 00000000   ebp: 5d000000   esp: f44b5efc
ds: 007b   es: 007b   ss: 0068
Process innd (pid: 10936, threadinfo=f44b5000 task=d0eb2c70)
Stack: f77a1de4 00000004 00000000 c4af23ec c013143e c15706e0 c013da1c 5ccfb000
       c4af23f0 c013db0f c4af23ec f7101900 5ccfb000 00000001 5cc00000 ce8b25d0
       00000000 5d000000 c013dbc3 ce8b25cc 5cc00000 5d000000 f7101900 00000001
Call Trace:
 [<c013143e>] set_page_dirty+0x3e/0x50
 [<c013da1c>] filemap_sync_pte+0x5c/0x80
 [<c013db0f>] filemap_sync_pte_range+0xcf/0xf0
 [<c013dbc3>] filemap_sync+0x93/0x100
 [<c013dc96>] msync_interval+0x66/0xf0
 [<c013de37>] sys_msync+0x117/0x123
 [<c0103c7b>] syscall_call+0x7/0xb

Code: 0f ba 28 01 8b 40 08 39 d0 75 f5 0f ba 29 04 19 c0 85 c0 75

Mike.

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