When CONFIG_PAGE_OWNER=y, there is a bug in page allocation failure path.
(turn on Kernel Hacking -> Track page owner)
Patch is attached below.
error message is this
==
Dec 6 22:21:34 aworks kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000020
Dec 6 22:21:34 aworks kernel: printing eip:
Dec 6 22:21:34 aworks kernel: c0148267
Dec 6 22:21:34 aworks kernel: *pde = 00000000
Dec 6 22:21:34 aworks kernel: Oops: 0002 [#1]
Dec 6 22:21:34 aworks kernel: SMP
Dec 6 22:21:34 aworks kernel: last sysfs file: /class/vc/vcs2/dev
Dec 6 22:21:34 aworks kernel: Modules linked in: video
Dec 6 22:21:34 aworks kernel: CPU: 0
Dec 6 22:21:34 aworks kernel: EIP: 0060:[<c0148267>] Not tainted VLI
Dec 6 22:21:34 aworks kernel: EFLAGS: 00010286 (2.6.15-rc5-mm1)
Dec 6 22:21:34 aworks kernel: EIP is at __alloc_pages+0x297/0x3c0
Dec 6 22:21:34 aworks su(pam_unix)[2660]: session closed for user root
Dec 6 22:21:34 aworks kernel: eax: 0000000a ebx: e884c000 ecx: 00000000 edx: e884decc
Dec 6 22:21:34 aworks kernel: esi: 000242d2 edi: 00000000 ebp: e884decc esp: e884de88
Dec 6 22:21:34 aworks kernel: ds: 007b es: 007b ss: 0068
Dec 6 22:21:34 aworks kernel: Process bash (pid: 2663, threadinfo=e884c000 task=ed9ff070)
Dec 6 22:21:34 aworks kernel: Stack: <0>000242d2 0000000a c04a3ba8 00000042 00000000 000242d2 c04a3ba8 0000000a
Dec 6 22:21:34 aworks kernel: <0>00000010 00000000 e884c000 00000042 e884dea6 00000000 c1090000 000001f4
Dec 6 22:21:34 aworks kernel: <0>ec06abc0 e884ded8 c015ce58 c1090000 e884def0 c015d117 c1090000 e884dfa0
Dec 6 22:21:34 aworks kernel: Call Trace:
Dec 6 22:21:34 aworks kernel: [<c0103dc2>] show_stack+0xa2/0xe0
Dec 6 22:21:34 aworks kernel: [<c0103f8f>] show_registers+0x16f/0x200
Dec 6 22:21:34 aworks kernel: [<c01041df>] die+0x11f/0x1b0
Dec 6 22:21:34 aworks kernel: [<c0428500>] do_page_fault+0x330/0x638
Dec 6 22:21:34 aworks kernel: [<c0103a4f>] error_code+0x4f/0x54
Dec 6 22:21:34 aworks kernel: [<c015ce58>] alloc_fresh_huge_page+0x18/0x50
Dec 6 22:21:34 aworks kernel: [<c015d117>] set_max_huge_pages+0x47/0xc0
Dec 6 22:21:34 aworks kernel: [<c015d1d1>] hugetlb_sysctl_handler+0x41/0x50
Dec 6 22:21:34 aworks kernel: [<c0125c48>] do_rw_proc+0xe8/0x100
Dec 6 22:21:34 aworks kernel: [<c0125cde>] proc_writesys+0x2e/0x30
Dec 6 22:21:34 aworks kernel: [<c01668b6>] vfs_write+0xa6/0x190
Dec 6 22:21:34 aworks kernel: [<c0166a57>] sys_write+0x47/0x70
Dec 6 22:21:34 aworks kernel: [<c0102ecf>] sysenter_past_esp+0x54/0x75
Dec 6 22:21:34 aworks kernel: Code: c0 89 44 24 04 89 54 24 08 e8 06 6c fd ff e8 b1 bb fb ff e8 ac ce fc ff 8b 4d e0 8b 45 d8 8d 5d ec 89 ea 81 e3 00 e0 ff ff 89 cf <89> 41 20 89 71 24 83 c7 28 31 c0 b9 08 00 00 00 f3 ab 31 f6 39
==
--Kame
---
Fix NULL pointer reference of set_page_owner() in allcation faulure path.
Signed-Off-by: Kamezawa Hiroyuki <[email protected]>
Index: linux-2.6.15-rc5-mm1.org/mm/page_alloc.c
===================================================================
--- linux-2.6.15-rc5-mm1.org.orig/mm/page_alloc.c
+++ linux-2.6.15-rc5-mm1.org/mm/page_alloc.c
@@ -1136,7 +1136,8 @@ nopage:
}
got_pg:
#ifdef CONFIG_PAGE_OWNER
- set_page_owner(page, order, gfp_mask);
+ if (page)
+ set_page_owner(page, order, gfp_mask);
#endif
return page;
}
-
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