Hi All,
I hit the below crashed when doing memory related tests[1] on s390x:
--------------- snip ---------------------
� 15929.351639¨ � <000000000021c0a6>¨ shrink_inactive_list+0x1c6/0x56c
� 15929.351647¨ � <000000000021c69e>¨ shrink_lruvec+0x252/0x56c
� 15929.351654¨ � <000000000021ca44>¨ shrink_zone+0x8c/0x1bc
� 15929.351662¨ � <000000000021d080>¨ balance_pgdat+0x50c/0x658
� 15929.351671¨ � <000000000021d318>¨ kswapd+0x14c/0x470
� 15929.351680¨ � <0000000000158292>¨ kthread+0xda/0xe4
� 15929.351690¨ � <000000000062a5de>¨ kernel_thread_starter+0x6/0xc
� 15929.351700¨ � <000000000062a5d8>¨ kernel_thread_starter+0x0/0xc
� 16109.346061¨ INFO: rcu_sched self-detected stall on CPU { 0} (t=24006 jiffies
g=89766 c=89765 q=10544)
� 16109.346101¨ CPU: 0 Tainted: G D 3.9.0-rc6+ #1
� 16109.346106¨ Process kswapd0 (pid: 28, task: 000000003b2a0000, ksp: 000000003b
2ab8c0)
� 16109.346110¨ 000000000001bb60 000000000001bb70 0000000000000002 0000000
000000000
000000000001bc00 000000000001bb78 000000000001bb78 00000000001009ca
0000000000000000 0000000000002930 000000000000000a 000000000000000a
000000000001bbc0 000000000001bb60 0000000000000000 0000000000000000
000000000063bb18 00000000001009ca 000000000001bb60 000000000001bbb0
� 16109.346170¨ Call Trace:
� 16109.346179¨ (� <0000000000100920>¨ show_trace+0x128/0x12c)
� 16109.346195¨ � <00000000001cd320>¨ rcu_check_callbacks+0x458/0xccc
� 16109.346209¨ � <0000000000140f2e>¨ update_process_times+0x4a/0x74
� 16109.346222¨ � <0000000000199452>¨ tick_sched_handle.isra.12+0x5e/0x70
� 16109.346235¨ � <00000000001995aa>¨ tick_sched_timer+0x6a/0x98
� 16109.346247¨ � <000000000015c1ea>¨ __run_hrtimer+0x8e/0x200
� 16109.346381¨ � <000000000015d1b2>¨ hrtimer_interrupt+0x212/0x2b0
� 16109.346385¨ � <00000000001040f6>¨ clock_comparator_work+0x4a/0x54
� 16109.346390¨ � <000000000010d658>¨ do_extint+0x158/0x15c
� 16109.346396¨ � <000000000062aa24>¨ ext_skip+0x38/0x3c
� 16109.346404¨ � <00000000001153c8>¨ smp_yield_cpu+0x44/0x48
� 16109.346412¨ (� <000003d10051aec0>¨ 0x3d10051aec0)
� 16109.346457¨ � <000000000024206a>¨ __page_check_address+0x16a/0x170
� 16109.346466¨ � <00000000002423a2>¨ page_referenced_one+0x3e/0xa0
� 16109.346501¨ � <000000000024427c>¨ page_referenced+0x32c/0x41c
� 16109.346510¨ � <000000000021b1dc>¨ shrink_page_list+0x380/0xb9c
� 16109.346521¨ � <000000000021c0a6>¨ shrink_inactive_list+0x1c6/0x56c
� 16109.346532¨ � <000000000021c69e>¨ shrink_lruvec+0x252/0x56c
� 16109.346542¨ � <000000000021ca44>¨ shrink_zone+0x8c/0x1bc
� 16109.346553¨ � <000000000021d080>¨ balance_pgdat+0x50c/0x658
� 16109.346564¨ � <000000000021d318>¨ kswapd+0x14c/0x470
� 16109.346576¨ � <0000000000158292>¨ kthread+0xda/0xe4
� 16109.346656¨ � <000000000062a5de>¨ kernel_thread_starter+0x6/0xc
� 16109.346682¨ � <000000000062a5d8>¨ kernel_thread_starter+0x0/0xc
[-- MARK -- Fri Apr 12 06:15:00 2013]
� 16289.386061¨ INFO: rcu_sched self-detected stall on CPU { 0} (t=42010 jiffies
g=89766 c=89765 q=10627)
-------------- snip ----------------------
The testing system has 1Gb RAM, kernel is new latest mainline.
please let me know if you need any more info.
[1] reproducer is come from LTP: https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/mem/mtest06/mmap2.c
and execute it using this command: `./mmap2 -x 0.002 -a -p`
--
Thanks,
Zhouping
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