Message-ID: <20181129092031.GF21676@shao2-debian>
Date:   Thu, 29 Nov 2018 17:20:31 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, LKML <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...com>, lkp@...org
Subject: [LKP] [block] 9d037ad707: BUG:unable_to_handle_kernel

FYI, we noticed the following commit (built with gcc-7):

commit: 9d037ad707ed6069fbea4e38e6ee37e027b13f1d ("block: remove req->timeout_list")
https://git.kernel.org/cgit/linux/kernel/git/axboe/linux-block.git mq-perf

in testcase: fsmark
with following parameters:

	iterations: 1x
	nr_threads: 64t
	disk: 1BRD_48G
	fs: btrfs
	fs2: nfsv4
	filesize: 4M
	test_size: 40G
	sync_method: fsyncBeforeClose
	ucode: 0x42d
	cpufreq_governor: performance

test-description: The fsmark is a file system benchmark to test synchronous write workloads, for example, mail servers workload.
test-url: https://sourceforge.net/projects/fsmark/


on test machine: 48 threads Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz with 64G memory

caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):


+---------------------------------------------------------------------+------------+------------+
|                                                                     | 27d420bc47 | 9d037ad707 |
+---------------------------------------------------------------------+------------+------------+
| boot_successes                                                      | 5          | 24         |
| boot_failures                                                       | 1          |            |
| WARNING:suspicious_RCU_usage                                        | 1          |            |
| include/linux/xarray.h:#suspicious_rcu_dereference_check()usage     | 1          |            |
| include/linux/xarray.h:#suspicious_rcu_dereference_protected()usage | 1          |            |
| BUG:kernel_hang_in_test_stage                                       | 1          |            |
+---------------------------------------------------------------------+------------+------------+



[   26.259902] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[   26.269247] PGD 0 P4D 0 
[   26.272559] Oops: 0000 [#1] SMP PTI
[   26.276947] CPU: 42 PID: 0 Comm: swapper/42 Not tainted 4.20.0-rc1-00174-g9d037ad7 #1
[   26.286229] Hardware name: Intel Corporation S2600WP/S2600WP, BIOS SE5C600.86B.02.02.0002.122320131210 12/23/2013
[   26.298280] RIP: 0010:t10_pi_complete+0x5c/0x1d0
[   26.304001] Code: 00 00 0f b6 88 2a 01 00 00 88 5c 24 03 48 8b 5f 30 83 e9 09 48 d3 eb 45 31 ed f6 45 12 01 74 04 4c 8b 6d 78 44 0f b6 64 24 03 <45> 8b 4d 08 41 8b 7d 10 45 8b 55 14 45 8b 45 18 45 0f b6 dc 85 ff
[   26.326185] RSP: 0018:ffff881012283e98 EFLAGS: 00010246
[   26.332666] RAX: ffff8807eba48848 RBX: 0000000000000000 RCX: 00000000fffffff7
[   26.341306] RDX: 0000000000000018 RSI: 0000000000000000 RDI: ffff8807ed1e0000
[   26.349970] RBP: ffff880fedea5700 R08: ffff88101229ff40 R09: 0000000000000200
[   26.358648] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   26.367338] R13: 0000000000000000 R14: ffff8807ed1e0000 R15: ffff8810039c3400
[   26.376039] FS:  0000000000000000(0000) GS:ffff881012280000(0000) knlGS:0000000000000000
[   26.385840] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   26.393015] CR2: 0000000000000008 CR3: 0000000feeb0a005 CR4: 00000000001606e0
[   26.401744] Call Trace:
[   26.405154]  <IRQ>
[   26.408077]  sd_done+0x2b2/0x330 [sd_mod]
[   26.413274]  scsi_finish_command+0xcb/0x120
[   26.418638]  blk_done_softirq+0xa1/0xd0
[   26.423605]  __do_softirq+0xe3/0x311
[   26.428269]  irq_exit+0xf0/0x100
[   26.432548]  call_function_single_interrupt+0xf/0x20
[   26.438813]  </IRQ>
[   26.441836] RIP: 0010:cpuidle_enter_state+0xb4/0x330
[   26.448115] Code: 31 ff e8 8f 85 89 ff 45 84 f6 74 17 9c 58 0f 1f 44 00 00 f6 c4 02 0f 85 58 02 00 00 31 ff e8 d3 5a 8f ff fb 66 0f 1f 44 00 00 <85> ed 0f 88 35 02 00 00 4c 29 fb 48 ba cf f7 53 e3 a5 9b c4 20 48
[   26.470614] RSP: 0018:ffffc900064f7ea0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff04
[   26.479879] RAX: ffff8810122a2c40 RBX: 000000061d3621be RCX: 000000000000001f
[   26.488663] RDX: 000000061d3621be RSI: 000000002f8590d5 RDI: 0000000000000000
[   26.497444] RBP: 0000000000000001 R08: 0000000000000002 R09: 00000000000224c0
[   26.506226] R10: ffffc900064f7e80 R11: 000000000000002a R12: ffffffff8274efb8
[   26.515003] R13: ffffe8fffec81d00 R14: 0000000000000000 R15: 000000061d34cc3f
[   26.523789]  do_idle+0x1f4/0x260
[   26.528114]  cpu_startup_entry+0x19/0x20
[   26.533236]  start_secondary+0x1ae/0x200
[   26.538335]  secondary_startup_64+0xa4/0xb0
[   26.543710] Modules linked in: sd_mod sg intel_rapl sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel aesni_intel mgag200 snd_pcm ipmi_si crypto_simd cryptd snd_timer ttm ipmi_devintf snd glue_helper drm_kms_helper soundcore isci pcspkr ipmi_msghandler syscopyarea libsas sysfillrect ahci sysimgblt fb_sys_fops libahci scsi_transport_sas drm libata wmi pcc_cpufreq ip_tables
[   26.592415] CR2: 0000000000000008
[   26.596941] ---[ end trace 47ea337d473f2b82 ]---


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp install job.yaml  # job file is attached in this email
        bin/lkp run     job.yaml



Thanks,
Rong Chen

View attachment "config-4.20.0-rc1-00174-g9d037ad7" of type "text/plain" (168237 bytes)

View attachment "job-script" of type "text/plain" (7788 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (21636 bytes)

View attachment "job.yaml" of type "text/plain" (5216 bytes)

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