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Subject: Re: Kernel 4.17.4 lockup
To:     "H.J. Lu" <hjl.tools@gmail.com>, "H. Peter Anvin" <hpa@zytor.com>,
        Matthew Wilcox <mawilcox@microsoft.com>,
        LKML <linux-kernel@vger.kernel.org>
References: <CAMe9rOqXsQ4Onv8_-kYE_yVYVfN0Hsg81XM0sq9k2cVYE_LvaQ@mail.gmail.com>
From:   Dave Hansen <dave.hansen@intel.com>
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Message-ID: <50d6bb50-5fa4-33d1-1f88-3844d0237f16@intel.com>
Date:   Mon, 9 Jul 2018 07:54:53 -0700
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On 07/09/2018 06:19 AM, Lu, Hongjiu wrote:
> On 3 x86-64 machines, kernel 4.17.4 locked up under heavy load. 2 of
them don't  have any kernel messages.  One has

Hi H.J.,

It'd be really handy if you could pastebin things like this, or attach a
text file with the oops. Your email wrapped the heck out of the oops and
I had to go and unwrap it to read it.

A full disassembly of free_pages_and_swap_cache() from the actual
vmlinux to account for differences between toolchains would be helpful.
It'll probably help me figure out what the loop counter was for
instance.  It makes it a bit easier to read random oopses if you boot
with 'nokaslr' because the pointer types (kernel text, linear map,
vmemmap, etc...) stick out much more easily. Would you be able to boot
with it in the future?

We've had a bit of churn in that code, but nothing between 4.16 and 4.17
that really sticks out to me in the x86 code.

The general protection fault is a bit of an oddball. If I disassembled
right, it's trying to dereference %R13+20. That doesn't even cross a
page boundary, so it's a bit hard to fathom where the #GP would come from.

(mostly) unwrapped oops below.

>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: general protection
>> fault: 0000 [#1] SMP PTI
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: Modules linked in:
>> rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache devlink ebtable_filter
>> ebtables ip6table_filter ip6_tables intel_rapl x86_pkg_temp_thermal
>> intel_powerclamp coretemp snd_hda_codec_hdmi snd_hda_codec_realtek
>> kvm_intel snd_hda_codec_generic snd_hda_intel kvm snd_hda_codec
>> snd_hda_core snd_hwdep irqbypass crct10dif_pclmul crc32_pclmul snd_seq
>> mei_wdt ghash_clmulni_intel snd_seq_device intel_cstate ppdev
>> intel_uncore iTCO_wdt gpio_ich iTCO_vendor_support snd_pcm
>> intel_rapl_perf snd_timer snd mei_me parport_pc joydev i2c_i801 mei
>> soundcore shpchp lpc_ich parport nfsd auth_rpcgss nfs_acl lockd grace
>> sunrpc i915 i2c_algo_bit drm_kms_helper r8169 drm crc32c_intel mii
>> video
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: CPU: 7 PID: 7093 Comm:
>> cc1 Not tainted 4.17.4-200.0.fc28.x86_64 #1
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: Hardware name: Gigabyte
>> Technology Co., Ltd. H87M-D3H/H87M-D3H, BIOS F11 08/18/2015
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RIP: 0010:free_pages_and_swap_cache+0x29/0xb0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RSP: 0018:ffffb2cd83ffbd58 EFLAGS: 00010202
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RAX: 0017fffe00040068 RBX: ffff93d4abb5ec80 RCX: 0000000000000000
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RDX: 0017fffe00040068 RSI: 00000000000001fe RDI: ffff93d51e3dd2a0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RBP: 00000000000001fe R08: fffff0809df82d20 R09: ffff93d51e5d5000
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: R10: ffff93d51e5d5e20 R11: ffff93d51e5d5d00 R12: ffff93d4abb5e010
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: R13: fffbf0809e304bc0 R14: ffff93d4abb5f000 R15: ffff93d4cbcee8f0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: FS: 0000000000000000(0000) GS:ffff93d51e3c0000(0000) knlGS:0000000000000000
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: CR2: 00007ffb255e753c CR3: 00000005e820a002 CR4: 00000000001606e0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: Call Trace: 
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  tlb_flush_mmu_free+0x31/0x50
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  arch_tlb_finish_mmu+0x42/0x70
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  tlb_finish_mmu+0x1f/0x30
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  exit_mmap+0xca/0x190
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  mmput+0x5f/0x130
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  do_exit+0x280/0xae0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  ? __do_page_fault+0x263/0x4e0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  do_group_exit+0x3a/0xa0
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  __x64_sys_exit_group+0x14/0x20
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel:  do_syscall_64+0x65/0x160
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: entry_SYSCALL_64_after_hwframe+0x44/0xa9
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RIP: 0033:0x7ffb2542b3c6
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RSP: 002b:00007ffd9e7e33b8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RAX: ffffffffffffffda RBX: 00007ffb2551c740 RCX: 00007ffb2542b3c6
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RBP: 0000000000000000 R08: 00000000000000e7 R09: fffffffffffffe70
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: R10: 00007ffd9e7e3250 R11: 0000000000000246 R12: 00007ffb2551c740
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: R13: 0000000000000037 R14: 00007ffb25525708 R15: 0000000000000000
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: Code: 40 00 0f 1f 44 00 00 41 56 41 55 41 54 49 89 fc 55 89 f5 53 e8 29 99 fb ff 85 ed 7e 6b 8d 45 ff 4c 89 e3 4d 8d 74 c4 08 4c 8b 2b <49> 8b 55 20 48 8d 42 ff 83 e2 01 49 0f 44 c5 48 8b 48 20 48 8d
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: RIP: free_pages_and_swap_cache+0x29/0xb0 RSP: ffffb2cd83ffbd58
>> Jul 05 14:33:32 gnu-hsw-1.sc.intel.com kernel: ---[ end trace 5960277fd8a3c0b5 ]---