linux-kernel - [mm] [confidence: ] c7be46a228: kernel_BUG_at

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Date:   Wed, 22 Jan 2020 15:02:51 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org
Subject: [mm]  [confidence: ] c7be46a228: kernel_BUG_at_mm/filemap.c

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

commit: c7be46a2287b8d60b96a090f8eb554213ce1e1a6 ("mm: Unify all add_to_page_cache variants")
https://github.com/0day-ci/linux Matthew-Wilcox/Replacing-the-readpages-a_op/20200116-120705

in testcase: rcuperf
with following parameters:

	runtime: 300s
	perf_type: srcud



on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 8G

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


+------------------------------------------+------------+------------+
|                                          | 8f8953aaa5 | c7be46a228 |
+------------------------------------------+------------+------------+
| boot_successes                           | 16         | 0          |
| boot_failures                            | 0          | 6          |
| kernel_BUG_at_mm/filemap.c               | 0          | 6          |
| invalid_opcode:#[##]                     | 0          | 6          |
| EIP:add_to_page_cache                    | 0          | 6          |
| Kernel_panic-not_syncing:Fatal_exception | 0          | 6          |
+------------------------------------------+------------+------------+


If you fix the issue, kindly add following tag
Reported-by: kernel test robot <oliver.sang@...el.com>


[    1.698054] kernel BUG at mm/filemap.c:859!
[    1.698550] invalid opcode: 0000 [#1] PREEMPT SMP
[    1.698898] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.5.0-rc4-00018-gc7be46a2287b8 #1
[    1.699479] EIP: add_to_page_cache+0x53/0x470
[    1.699798] Code: 00 00 00 8d 42 ff c7 45 ec 00 00 00 00 c7 45 f0 00 00 00 00 75 02 89 f0 8b 00 a8 01 75 11 ba 14 1a c9 b2 89 f0 e8 9d 0f 03 00 <0f> 0b 8d 76 00 8b 56 04 89 f0 f6 c2 01 74 0e 8d 42 ff 8d b4 26 00
[    1.701131] EAX: 00000000 EBX: ee919970 ECX: 00000000 EDX: 00000001
[    1.701584] ESI: f5a18860 EDI: 00000000 EBP: ef497c88 ESP: ef497c5c
[    1.701842] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 EFLAGS: 00010246
[    1.701842] CR0: 80050033 CR2: ffffffff CR3: 032ce000 CR4: 000406d0
[    1.701842] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
[    1.701842] DR6: fffe0ff0 DR7: 00000400
[    1.701842] Call Trace:
[    1.701842]  ? find_get_pages_contig+0x430/0x430
[    1.701842]  ? ktime_get_coarse_real_ts64+0x65/0xe0
[    1.701842]  pagecache_get_page+0x286/0x320
[    1.701842]  grab_cache_page_write_begin+0x20/0x40
[    1.701842]  simple_write_begin+0x33/0x1f0
[    1.701842]  generic_perform_write+0xa3/0x180
[    1.701842]  ? generic_file_write_iter+0x24/0x220
[    1.701842]  __generic_file_write_iter+0x17a/0x1e0
[    1.701842]  ? generic_file_write_iter+0x24/0x220
[    1.701842]  generic_file_write_iter+0x16c/0x220
[    1.701842]  __vfs_write+0x168/0x1e0
[    1.701842]  vfs_write+0xb6/0x1b0
[    1.701842]  ? __kmalloc_track_caller+0x2b0/0x330
[    1.701842]  ksys_write+0x4c/0xb0
[    1.701842]  xwrite+0x1e/0x47
[    1.701842]  do_copy+0x24/0xb5
[    1.701842]  write_buffer+0x1f/0x2e
[    1.701842]  flush_buffer+0x5b/0x71
[    1.701842]  __gunzip+0x214/0x2a8
[    1.701842]  ? bunzip2+0x301/0x301
[    1.701842]  ? __gunzip+0x2a8/0x2a8
[    1.701842]  gunzip+0x16/0x18
[    1.701842]  ? write_buffer+0x2e/0x2e
[    1.701842]  ? md_run_setup+0xac/0xac
[    1.701842]  unpack_to_rootfs+0x145/0x256
[    1.701842]  ? write_buffer+0x2e/0x2e
[    1.701842]  ? md_run_setup+0xac/0xac
[    1.701842]  ? unpack_to_rootfs+0x256/0x256
[    1.701842]  populate_rootfs+0x47/0x93
[    1.701842]  do_one_initcall+0x105/0x2c0
[    1.701842]  ? parse_args+0x17e/0x350
[    1.701842]  ? rcu_lockdep_current_cpu_online+0x56/0x70
[    1.701842]  ? rcu_read_lock_sched_held+0x2f/0x60
[    1.701842]  ? trace_initcall_level+0x97/0xcf
[    1.701842]  ? kernel_init_freeable+0xe5/0x154
[    1.701842]  kernel_init_freeable+0xfd/0x154
[    1.701842]  ? rest_init+0x220/0x220
[    1.701842]  kernel_init+0xb/0x100
[    1.701842]  ? schedule_tail_wrapper+0x9/0xc
[    1.701842]  ret_from_fork+0x2e/0x38
[    1.701842] Modules linked in:
[    1.715745] ---[ end trace 590bc27ca0704de4 ]---


To reproduce:

        # build kernel
	cd linux
	cp config-5.5.0-rc4-00018-gc7be46a2287b8 .config
	make HOSTCC=gcc-7 CC=gcc-7 ARCH=i386 olddefconfig prepare modules_prepare bzImage

        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,
Oliver Sang


View attachment "config-5.5.0-rc4-00018-gc7be46a2287b8" of type "text/plain" (151266 bytes)

View attachment "job-script" of type "text/plain" (4611 bytes)

Download attachment "dmesg.xz" of type "application/x-xz" (10280 bytes)