linux-kernel - Re: 2.6.26-$sha1: RIP gup_pte

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Date:	Mon, 28 Jul 2008 22:53:16 +0400
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	akpm@...l.org, torvalds@...l.org
Cc:	npiggin@...e.de, linux-kernel@...r.kernel.org
Subject: Re: 2.6.26-$sha1: RIP gup_pte_range+0x54/0x120

On Mon, Jul 28, 2008 at 10:49:47PM +0400, Alexey Dobriyan wrote:
> Version: 2.6.26-837b41b5de356aa67abb2cadb5eef3efc7776f91
> Core2 Duo, x86_64, 4 GB of RAM.
> 
> Kernel is "tainted" with ZFS driver, but it can so little, and
> probability of screwup is very little too. :-)
> 
> 
> Long LTP session finally ended with
> 
> BUG: unable to handle kernel paging request at ffff88012b60c000
> IP: [<ffffffff80223ff4>] gup_pte_range+0x54/0x120
> PGD 202063 PUD a067 PMD 17cedc163 PTE 800000012b60c160
> Oops: 0000 [1] PREEMPT SMP DEBUG_PAGEALLOC
> CPU 0 
> Modules linked in: zfs iptable_raw xt_state iptable_filter ipt_MASQUERADE iptable_nat nf_nat nf_conntrack_ipv4 ip_tables x_tables nf_conntrack_irc nf_conntrack fuse usblp uhci_hcd ehci_hcd usbcore sr_mod cdrom [last unloaded: zfs]
> Pid: 16863, comm: vmsplice01 Tainted: G        W 2.6.26-zfs #2
> RIP: 0010:[<ffffffff80223ff4>]  [<ffffffff80223ff4>] gup_pte_range+0x54/0x120
> RSP: 0018:ffff88012ff57c68  EFLAGS: 00010096
> RAX: 0000000000000008 RBX: 00007fff4a800000 RCX: 0000000000000001
> RDX: ffffe200040b5f00 RSI: 00007fff4a800310 RDI: ffff88012b60c000
> RBP: ffff88012ff57c78 R08: 0000000000000005 R09: ffff88012ff57cec
> R10: 0000000000000024 R11: 0000000000000205 R12: ffff88012ff57e58
> R13: 00007fff4a807310 R14: 00007fff4a80730f R15: ffff88012ff57e58
> FS:  00007fbb4280b6f0(0000) GS:ffffffff805dec40(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffff88012b60c000 CR3: 000000017e294000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process vmsplice01 (pid: 16863, threadinfo ffff88012ff56000, task ffff88015f9db360)
> Stack:  00007fff4a800000 ffff88010e6cf298 ffff88012ff57d18 ffffffff802243cb
>  0000000000000002 ffff88015f9db360 0000000004f23a08 00007fff4a7f7310
>  ffff88017d582880 00007fff4a807310 00007fff4a807310 ffff88017e2947f8
> Call Trace:
>  [<ffffffff802243cb>] get_user_pages_fast+0x1db/0x300
>  [<ffffffff802b1bfd>] sys_vmsplice+0x32d/0x420
>  [<ffffffff80262acd>] ? unlock_page+0x2d/0x40
>  [<ffffffff80275d78>] ? __do_fault+0x1c8/0x450
>  [<ffffffff8030e20c>] ? __up_read+0x4c/0xb0
>  [<ffffffff802495c6>] ? up_read+0x26/0x30
>  [<ffffffff802b0780>] ? spd_release_page+0x0/0x20
>  [<ffffffff80463f0d>] ? lockdep_sys_exit_thunk+0x35/0x67
>  [<ffffffff8020b65b>] system_call_fastpath+0x16/0x1b

Very reproducible and ZFS driver doesn't matter:

	# vmsplice01 from LTP 20080630
	# while true; do ./vmsplice01; done

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