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From: Dmitry Monakhov <dmonlist@gmail.com>
To: Dave Jones <davej@redhat.com>, Linux Kernel <linux-kernel@vger.kernel.org>
Cc: linux-ext4@vger.kernel.org
Subject: Re: kernel BUG at fs/ext4/inode.c:2982!
In-Reply-To: <20141016055718.GA17655@redhat.com>
References: <20141016055718.GA17655@redhat.com>
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Date: Thu, 16 Oct 2014 13:31:51 +0400
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Dave Jones <davej@redhat.com> writes:

> Just hit this on Linus' current tree while running my fuzz-tester.
> (No logs unfortunatly, so no idea what actually happened).
>
> kernel BUG at fs/ext4/inode.c:2982!
Looks
familiar.http://web.nvd.nist.gov/view/vuln/detail?vulnId=3DCVE-2014-8086
Are you playing with fcntl?
Try this patch http://www.spinics.net/lists/linux-ext4/msg45683.html
> invalid opcode: 0000 [#1] SMP DEBUG_PAGEALLOC
> Modules linked in: hidp rfcomm af_key llc2 can_bcm sctp libcrc32c can_raw=
 nfc caif_socket caif af_802154 ieee802154 phonet af_rxrpc bluetooth can pp=
poe pppox ppp_generic slhc irda crc_ccitt rds rose x25 atm netrom appletalk=
 ipx p8023 p8022 psnap llc ax25 nouveau cfg80211 rfkill kvm_intel kvm video=
 backlight mxm_wmi wmi i2c_algo_bit drm_kms_helper ttm drm microcode tg3 se=
rio_raw pcspkr ptp pps_core libphy i2c_core lpc_ich mfd_core rtc_cmos shpch=
p nfsd auth_rpcgss oid_registry nfs_acl lockd grace sunrpc raid0 floppy
> CPU: 3 PID: 24261 Comm: trinity-c10 Not tainted 3.17.0+ #5=20
> Hardware name: Dell Inc.                 Precision WorkStation 490    /0D=
T031, BIOS A08 04/25/2008
> task: ffff8802094ccb40 ti: ffff8800bc168000 task.ti: ffff8800bc168000
> RIP: 0010:[<ffffffff9a27cf83>]  [<ffffffff9a27cf83>] ext4_direct_IO+0x713=
/0x750
> RSP: 0018:ffff8800bc16ba78  EFLAGS: 00010246
> RAX: 0000000000020000 RBX: 0000000000000001 RCX: 000000000000000f
> RDX: 0000000000000008 RSI: ffff880033e368d0 RDI: ffff8802094cd3b8
> RBP: ffff8800bc16baf8 R08: 0000000000000001 R09: 0000000000000000
> R10: 0000000000000001 R11: 0000000000000001 R12: ffff8800bc16bd40
> R13: ffff880033e368d0 R14: ffff8800bc16bb30 R15: 000000000000001f
> FS:  00007f8cc4e8f740(0000) GS:ffff880226400000(0000) knlGS:0000000000000=
000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000001 CR3: 00000000b7747000 CR4: 00000000000007e0
> DR0: 0000000001c16000 DR1: 000000000160a000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
> Stack:
>  ffffea000560a600 ffffea00060dc480 ffffea000503d880 ffffea0005cbfc80
>  ffffea00056e6500 ffffea00049b1780 ffff880033e368d0 ffffea0005da7980
>  0000000000010000 0000000000010000 ffff8800bc16baf8 ffff880033e36ae0
> Call Trace:
>  [<ffffffff9a1838d9>] generic_file_direct_write+0xa9/0x170
>  [<ffffffff9a183c4c>] __generic_file_write_iter+0x2ac/0x350
>  [<ffffffff9a275df9>] ext4_file_write_iter+0x109/0x3f0
>  [<ffffffff9a1d8adc>] ? __kmalloc+0x39c/0x420
>  [<ffffffff9a0a89e8>] ? sched_clock_cpu+0xa8/0xd0
>  [<ffffffff9a227881>] ? iter_file_splice_write+0x91/0x450
>  [<ffffffff9a0a8a66>] ? local_clock+0x16/0x30
>  [<ffffffff9a227a53>] iter_file_splice_write+0x263/0x450
>  [<ffffffff9a226d06>] direct_splice_actor+0x36/0x40
>  [<ffffffff9a2272d3>] splice_direct_to_actor+0xc3/0x1f0
>  [<ffffffff9a226cd0>] ? generic_pipe_buf_nosteal+0x10/0x10
>  [<ffffffff9a229032>] do_splice_direct+0x82/0xb0
>  [<ffffffff9a1f454f>] do_sendfile+0x1af/0x3a0
>  [<ffffffff9a1f533a>] SyS_sendfile64+0x8a/0xa0
>  [<ffffffff9a6ea82a>] ? tracesys_phase2+0x75/0xd9
>  [<ffffffff9a6ea889>] tracesys_phase2+0xd4/0xd9
> Code: e8 83 57 e4 ff 85 c0 0f 85 a0 fc ff ff e9 47 ff ff ff 48 c7 c7 e0 f=
4 c3 9a e8 6a 57 e4 ff 85 c0 0f 85 e7 fc ff ff e9 6c ff ff ff <0f> 0b be fe=
 0b 00 00 48 c7 c7 f9 4d a2 9a e8 7a 3b df ff e9 c8=20
> RIP  [<ffffffff9a27cf83>] ext4_direct_IO+0x713/0x750
>  RSP <ffff8800bc16ba78>
> ---[ end trace d80209ec68bf10b8 ]---
>
>
> That BUG_ON is..
>
> 2982         BUG_ON(iocb->private =3D=3D NULL);
>
> I'll try and reproduce it in the morning.
>
> 	Dave
> --
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