Date:	Tue, 26 Nov 2013 01:01:32 -0500
From:	Dave Jones <davej@...hat.com>
To:	Linux Kernel <linux-kernel@...r.kernel.org>, kmo@...erainc.com
Subject: Re: GPF in aio_migratepage

On Mon, Nov 25, 2013 at 10:26:45PM -0500, Dave Jones wrote:
 > Hi Kent,
 > 
 > I hit the GPF below on a tree based on 8e45099e029bb6b369b27d8d4920db8caff5ecce
 > which has your commit e34ecee2ae791df674dfb466ce40692ca6218e43
 > ("aio: Fix a trinity splat").  Is this another path your patch missed, or
 > a completely different bug to what you were chasing ?

And here's another from a different path, this time on 32bit.


Oops: 0002 [#1] PREEMPT SMP DEBUG_PAGEALLOC
Modules linked in: tun fuse hidp rfcomm bnep scsi_transport_iscsi l2tp_ppp l2tp_netlink l2tp_core nfc caif_socket caif af_802154 phonet af_rxrpc bluetooth rfkill can_raw can_bcm can llc2 pppoe pppox ppp_generic slhc irda crc_ccitt rds af_key rose x25 atm netrom appletalk ipx p8023 p8022 psnap llc ax25 nouveau video backlight mxm_wmi wmi i2c_algo_bit ttm drm_kms_helper drm i2c_core kvm_intel kvm tg3 ptp pps_core libphy serio_raw pcspkr lpc_ich microcode mfd_core rtc_cmos parport_pc parport shpchp xfs libcrc32c raid0 floppy
CPU: 0 PID: 4517 Comm: trinity-child0 Not tainted 3.13.0-rc1+ #6 
Hardware name: Dell Inc.                 Precision WorkStation 490    /0DT031, BIOS A08 04/25/2008
task: ed899630 ti: dea22000 task.ti: dea22000
EIP: 0060:[<c11c7a02>] EFLAGS: 00010293 CPU: 0
EIP is at aio_migratepage+0xad/0x126
EAX: 00000144 EBX: f6844ed8 ECX: deaf4a84 EDX: 6b6b6b6b
ESI: f68dc508 EDI: deaf4800 EBP: dea23bcc ESP: dea23ba8
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
CR0: 8005003b CR2: 6b6b707b CR3: 2c985000 CR4: 000007f0
Stack:
 00000000 00000001 deaf4a84 00000286 d709b280 00000000 f68dc508 c11c7955
 f6844ed8 dea23c0c c116aa9f 00000001 00000001 c11c7955 c1179a33 00000000
 00000000 c114166d f6844ed8 f6844ed8 c1140fc9 dea23c0c 00000000 f6844ed8
Call Trace:
 [<c11c7955>] ? free_ioctx+0x62/0x62
 [<c116aa9f>] move_to_new_page+0x63/0x1bb
 [<c11c7955>] ? free_ioctx+0x62/0x62
 [<c1179a33>] ? mem_cgroup_prepare_migration+0xc1/0x243
 [<c114166d>] ? isolate_migratepages_range+0x3fb/0x675
 [<c1140fc9>] ? isolate_freepages_block+0x316/0x316
 [<c116b319>] migrate_pages+0x614/0x72b
 [<c1140fc9>] ? isolate_freepages_block+0x316/0x316
 [<c1141c21>] compact_zone+0x294/0x475
 [<c1142065>] try_to_compact_pages+0x129/0x196
 [<c15b95e7>] __alloc_pages_direct_compact+0x91/0x197
 [<c112a25c>] __alloc_pages_nodemask+0x863/0xa55
 [<c116b68f>] get_huge_zero_page+0x52/0xf9
 [<c116ef78>] do_huge_pmd_anonymous_page+0x24e/0x39f
 [<c1171c4b>] ? __mem_cgroup_count_vm_event+0xa6/0x191
 [<c1171c64>] ? __mem_cgroup_count_vm_event+0xbf/0x191
 [<c114815c>] handle_mm_fault+0x235/0xd9a
 [<c15c7586>] ? __do_page_fault+0xf8/0x5a1
 [<c15c75ee>] __do_page_fault+0x160/0x5a1
 [<c15c7586>] ? __do_page_fault+0xf8/0x5a1
 [<c15c7a2f>] ? __do_page_fault+0x5a1/0x5a1
 [<c15c7a3c>] do_page_fault+0xd/0xf
 [<c15c4e7c>] error_code+0x6c/0x74
 [<c114007b>] ? memcg_update_all_caches+0x23/0x6b
 [<c12d0be5>] ? __copy_from_user_ll+0x30/0xdb
 [<c12d0ccf>] _copy_from_user+0x3f/0x55
 [<c1057aa2>] SyS_setrlimit+0x27/0x50
 [<c1044792>] ? SyS_gettimeofday+0x33/0x6d
 [<c12d0798>] ? trace_hardirqs_on_thunk+0xc/0x10
 [<c15cb33b>] sysenter_do_call+0x12/0x32
Code: 6e 8d 8f 84 02 00 00 89 c8 89 4d e4 e8 df bf 3f 00 89 45 e8 89 da 89 f0 e8 99 2b fa ff 8b 43 08 3b 47 54 8b 4d e4 73 06 8b 57 50 <89> 34 82 8b 55 e8 89 c8 e8 aa c1 3f 00 8b 45 ec e8 28 c1 3f 00

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