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Date: Fri, 10 Jan 2014 22:22:48 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Daniel Borkmann <borkmann@iogearbox.net>
Cc: linux-kernel <linux-kernel@vger.kernel.org>,
        Vlastimil Babka <vbabka@suse.cz>,
        Michel Lespinasse <walken@google.com>
Subject: Re: [BUG] at include/linux/page-flags.h:415 (PageTransHuge)
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On Fri, 10 Jan 2014 19:23:26 +0100 Daniel Borkmann <borkmann@iogearbox.net> wrote:

> This is being reliably triggered for each mmaped() packet(7)
> socket from user space, basically during unmapping resp.
> closing the TX socket.
> 
> I believe due to some change in transparent hugepages code ?
> 
> When I disable transparent hugepages, everything works fine,
> no BUG triggered.
> 
> I'd be happy to test patches.

Did the inclusion of c424be1cbbf852e46acc8 ("mm: munlock: fix a bug
where THP tail page is encountered") in current mainline fix this?

> With using default kernel config:
> 
> [   63.887947] kernel BUG at include/linux/page-flags.h:415!
> [   63.889296] invalid opcode: 0000 [#4] SMP
> [   63.890637] Modules linked in: fuse ebtable_nat xt_CHECKSUM bridge stp llc rfcomm bnep nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6table_nat nf_nat_ipv6 ip6table_mangle ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 iptable_nat nf_nat_ipv4 nf_nat iptable_mangle nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ebtable_filter ebtables ip6table_filter ip6_tables snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm iwlwifi snd_page_alloc btusb snd_timer bluetooth cfg80211 wmi joydev thinkpad_acpi snd iTCO_wdt iTCO_vendor_support pcspkr e1000e tpm_tis tpm uvcvideo i2c_i801 soundcore sdhci_pci sdhci lpc_ich rfkill videobuf2_vmalloc videobuf2_memops videobuf2_core mmc_core mfd_core ptp videodev pps_core media uinput i915
> [   63.895055]  i2c_algo_bit drm_kms_helper drm i2c_core video
> [   63.896529] CPU: 2 PID: 1598 Comm: trafgen Tainted: G      D      3.13.0-rc6+ #12
> [   63.898010] Hardware name: LENOVO 2429BP3/2429BP3, BIOS G4ET37WW (1.12 ) 05/29/2012
> [   63.899494] task: ffff8801eca6c1a0 ti: ffff88020e694000 task.ti: ffff88020e694000
> [   63.900988] RIP: 0010:[<ffffffff8168a492>]  [<ffffffff8168a492>] PageTransHuge.part.11+0x4/0x6
> [   63.902498] RSP: 0018:ffff88020e695df8  EFLAGS: 00010282
> [   63.903996] RAX: 005fffc000008004 RBX: ffff88020254cac8 RCX: 00000000078ed340
> [   63.905492] RDX: ffffffff8116b3c6 RSI: 0000000000000001 RDI: ffff88020cf80640
> [   63.906992] RBP: ffff88020e695df8 R08: 0000000000000000 R09: 0000000000000000
> [   63.908485] R10: ffff8801eca6c1a0 R11: 00000000100000fb R12: ffffea00078ed340
> [   63.909970] R13: ffff88020e695f48 R14: 00007f274a5f3000 R15: 00007f274a5f4000
> [   63.911456] FS:  00007f274e5f3740(0000) GS:ffff88021e280000(0000) knlGS:0000000000000000
> [   63.912946] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   63.914430] CR2: 0000003724a35a90 CR3: 00000001eabb6000 CR4: 00000000001407e0
> [   63.915919] Stack:
> [   63.917404]  ffff88020e695ee0 ffffffff8116fa7a 0000000ed78ec480 00007f274e5f2fff
> [   63.918913]  0000000000000001 00007f274e5f3000 00000000810c864b ffff8801fb16aca8
> [   63.920430]  0000000000000000 0000000000000000 ffff88020e695e58 0000000000000046
> [   63.921938] Call Trace:
> [   63.923451]  [<ffffffff8116fa7a>] munlock_vma_pages_range+0x2ea/0x2f0
> [   63.924978]  [<ffffffff810a07bd>] ? trace_hardirqs_off+0xd/0x10
> [   63.926454]  [<ffffffff81171b32>] ? vma_merge+0xc2/0x330
> [   63.927870]  [<ffffffff8116fb7c>] mlock_fixup+0xfc/0x190
> [   63.929288]  [<ffffffff8116fdc7>] do_mlockall+0x87/0xc0
> [   63.930702]  [<ffffffff811702bf>] sys_munlockall+0x2f/0x50
> [   63.932117]  [<ffffffff8169df52>] system_call_fastpath+0x16/0x1b
> [   63.933531] Code: c1 e0 06 48 29 d8 eb 02 31 c0 5b 41 5c 5d c3 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 89 e5 <0f> 0b 55 48 89 e5 0f 0b 55 48 89 e5 0f 0b 55 48 8b 07 31 c9 48
> [   63.935103] RIP  [<ffffffff8168a492>] PageTransHuge.part.11+0x4/0x6
> [   63.936580]  RSP <ffff88020e695df8>
> [   63.938021] ---[ end trace 67b7aa3fba09186d ]---

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