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Subject[BUG] hackbench locks up with perf in 3.11-rc1 and beyond
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I went to do some benchmarks on the jump label code, and ran:


perf stat -r 100 ./hackbench 50

It ran twice, and then would die with:

[ 65.785108] hackbench invoked oom-killer: gfp_mask=0x200da, order=0, oom_score_adj=0
[ 65.792921] hackbench cpuset=/ mems_allowed=0
[ 65.797286] CPU: 6 PID: 6042 Comm: hackbench Not tainted 3.11.0-rc4-test+ #26
[ 65.804428] Hardware name: Hewlett-Packard HP Compaq Pro 6300 SFF/339A, BIOS K01 v02.05 05/07/2012
[ 65.813392] 0000000000000000 ffff8800105f5478 ffffffff8162024f 000000000000001e
[ 65.820876] ffff8800105f9770 ffff8800105f54f8 ffffffff8161ca6e 0000000000000000
[ 65.828365] 0000000000000f48 0000000000000008 ffffffff81c375e0 ffffffff00000000
[ 65.835862] Call Trace:
[ 65.838317] [<ffffffff8162024f>] dump_stack+0x46/0x58
[ 65.843471] [<ffffffff8161ca6e>] dump_header+0x7a/0x1be
[ 65.848791] [<ffffffff812ee4c3>] ? ___ratelimit+0x93/0x110
[ 65.854373] [<ffffffff8112f65b>] oom_kill_process+0x1cb/0x330
[ 65.860234] [<ffffffff8112fe20>] out_of_memory+0x470/0x4c0
[ 65.865817] [<ffffffff81135659>] __alloc_pages_nodemask+0xab9/0xad0
[ 65.872178] [<ffffffff812cadf9>] ? blk_recount_segments+0x29/0x40
[ 65.878375] [<ffffffff81173cb3>] alloc_pages_vma+0xa3/0x150
[ 65.884048] [<ffffffff8116786b>] read_swap_cache_async+0x10b/0x190
[ 65.890324] [<ffffffff8116798e>] swapin_readahead+0x9e/0xf0
[ 65.895992] [<ffffffff81154e4f>] handle_pte_fault+0x29f/0xa60
[ 65.901832] [<ffffffff81124cda>] ? __perf_sw_event+0x16a/0x190
[ 65.907761] [<ffffffff81124cda>] ? __perf_sw_event+0x16a/0x190
[ 65.913689] [<ffffffff8108d5be>] ? update_curr+0x1ee/0x200
[ 65.919269] [<ffffffff811567d6>] handle_mm_fault+0x256/0x5d0
[ 65.925027] [<ffffffff8162aa02>] __do_page_fault+0x182/0x4c0
[ 65.930787] [<ffffffff81122b56>] ? __perf_event_task_sched_in+0x196/0x1b0
[ 65.937670] [<ffffffff810819f8>] ? finish_task_switch+0xa8/0xe0
[ 65.943684] [<ffffffff81624bef>] ? __schedule+0x3bf/0x7f0
[ 65.949177] [<ffffffff8162ad4e>] do_page_fault+0xe/0x10
[ 65.954495] [<ffffffff816273f2>] page_fault+0x22/0x30
[ 65.959641] [<ffffffff812f4a09>] ? copy_user_enhanced_fast_string+0x9/0x20
[ 65.966611] [<ffffffff812fa2d7>] ? memcpy_toiovec+0x47/0x80
[ 65.972286] [<ffffffff815c81c7>] unix_stream_recvmsg+0x4e7/0x8d0
[ 65.978392] [<ffffffff81077460>] ? remove_wait_queue+0x50/0x50
[ 65.984321] [<ffffffff81512076>] sock_aio_read.part.11+0x156/0x170
[ 65.990596] [<ffffffff81124cda>] ? __perf_sw_event+0x16a/0x190
[ 65.996522] [<ffffffff815120b3>] sock_aio_read+0x23/0x30
[ 66.001930] [<ffffffff8119407a>] do_sync_read+0x7a/0xb0
[ 66.007254] [<ffffffff8119509d>] vfs_read+0x16d/0x180
[ 66.012398] [<ffffffff81195262>] SyS_read+0x52/0xa0
[ 66.017369] [<ffffffff810d6dd0>] ? __audit_syscall_exit+0x200/0x280
[ 66.023728] [<ffffffff8162f482>] system_call_fastpath+0x16/0x1b

As it always ran hackbench twice and then crashed, I changed the test to be just:

perf stat -r 10 ./hackbench 50

And kicked off ktest.pl to do the bisect. It came up with this commit as
the culprit:

commit 318df36e57c0ca9f2146660d41ff28e8650af423
Author: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Date: Wed Jun 19 15:33:55 2013 +0900

slub: do not put a slab to cpu partial list when cpu_partial is 0

In free path, we don't check number of cpu_partial, so one slab can
be linked in cpu partial list even if cpu_partial is 0. To prevent
this,
we should check number of cpu_partial in put_cpu_partial().

Acked-by: Christoph Lameeter <cl@linux.com>
Reviewed-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>


I reverted the commit, and sure enough, perf now can run hackbench for
all the runs I specify.

-- Steve




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