netdev - [LKP] [SUNRPC] 9502426546: kernel_BUG_at_lib/iov

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Date:   Thu, 1 Nov 2018 09:04:39 +0800
From:   kernel test robot <rong.a.chen@...el.com>
To:     Julien Thierry <julien.thierry@....com>
Cc:     linux-nfs@...r.kernel.org, Julien Thierry <julien.thierry@....com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        Anna Schumaker <anna.schumaker@...app.com>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Jeff Layton <jlayton@...nel.org>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, lkp@...org
Subject: [LKP] [SUNRPC] 9502426546: kernel_BUG_at_lib/iov_iter.c

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

commit: 950242654634fb437dc5848a23c970589e62b088 ("[PATCH] SUNRPC: Fix iter_iov_*vec warnings")
url: https://github.com/0day-ci/linux/commits/Julien-Thierry/SUNRPC-Fix-iter_iov_-vec-warnings/20181030-020648
base: git://git.linux-nfs.org/projects/trondmy/linux-nfs.git linux-next

in testcase: boot

on test machine: qemu-system-x86_64 -enable-kvm -cpu host -smp 2 -m 4G

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


+------------------------------------------+------------+------------+
|                                          | 86bbd7422a | 9502426546 |
+------------------------------------------+------------+------------+
| boot_successes                           | 4          | 2          |
| boot_failures                            | 0          | 4          |
| kernel_BUG_at_lib/iov_iter.c             | 0          | 4          |
| invalid_opcode:#[##]                     | 0          | 4          |
| RIP:iov_iter_kvec                        | 0          | 4          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 4          |
+------------------------------------------+------------+------------+



[  192.691114] kernel BUG at lib/iov_iter.c:1067!
[  192.706864] invalid opcode: 0000 [#1] PREEMPT DEBUG_PAGEALLOC PTI
[  192.722744] CPU: 0 PID: 395 Comm: kworker/u3:1 Not tainted 4.19.0-rc6-00095-g9502426 #1
[  192.734956] Workqueue: xprtiod xs_stream_data_receive_workfn
[  192.743807] RIP: 0010:iov_iter_kvec+0xa/0x30
[  192.753616] Code: eb 0e 48 8b 56 08 48 29 ca 48 39 d0 48 0f 47 c2 5d c3 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 40 f6 c6 02 75 06 55 48 89 e5 <0f> 0b 89 37 48 89 57 18 48 89 4f 20 48 c7 47 08 00 00 00 00 4c 89
[  192.791830] RSP: 0018:ffff88012606fd00 EFLAGS: 00010246
[  192.800611] RAX: ffff880129494d20 RBX: ffff880129494548 RCX: 0000000000000001
[  192.812147] RDX: ffff88012606fd60 RSI: 0000000000000000 RDI: ffff88012606fd80
[  192.823818] RBP: ffff88012606fd00 R08: 000000000000000c R09: 0000000000000001
[  192.835476] R10: ffff88012606fdf8 R11: 0000000000000000 R12: 000000000000000c
[  192.847111] R13: ffff88012606fd70 R14: ffff8801241f4040 R15: 0000000000000000
[  192.863641] FS:  0000000000000000(0000) GS:ffffffff8263d000(0000) knlGS:0000000000000000
[  192.876793] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  192.886211] CR2: 00005632b76b7ff0 CR3: 000000000261c001 CR4: 00000000000206b0
[  192.897906] Call Trace:
[  192.902089]  xs_read_stream+0x9b/0x820
[  192.910023]  ? preempt_count_sub+0x58/0x70
[  192.916866]  ? __mutex_lock+0x148/0x580
[  192.923216]  xs_stream_data_receive_workfn+0x51/0x100
[  192.931544]  process_one_work+0x27d/0x490
[  192.938124]  worker_thread+0x228/0x3b0
[  192.944376]  ? __kthread_parkme+0x51/0x90
[  192.950930]  kthread+0x132/0x140
[  192.956401]  ? process_one_work+0x490/0x490
[  192.963302]  ? __kthread_create_on_node+0x1b0/0x1b0
[  192.971404]  ret_from_fork+0x3a/0x50
[  192.981486] ---[ end trace e16b504e978b7121 ]---


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email



Thanks,
lkp

View attachment "config-4.19.0-rc6-00095-g9502426" of type "text/plain" (104538 bytes)

View attachment "job-script" of type "text/plain" (4352 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (14336 bytes)