Re: another perf_fuzzer hard lockup

[Vince Weaver]

Another one, not sure if related to the last one.

These are easy to trigger, but not reproducible at all even with pretty 
exact syscall trace matches.  So I'm not sure what's going on.

3.14-rc6, core2

[ 2696.228000] BUG: soft lockup - CPU#0 stuck for 23s! [perf_fuzzer:10256]      
[ 2696.228000] Modules linked in: cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_conservative f71882fg ohci_pci acpi_cpufreq coretemp evdev video mcs7830 usbnet wmi psmouse processor button thermal_sys serio_raw pcspkr ohci_hcd i2c_nforce2 sg ehci_pci ehci_hcd sd_mod usbcore usb_common                       
[ 2696.228000] CPU: 0 PID: 10256 Comm: perf_fuzzer Not tainted 3.14.0-rc6 #36   
[ 2696.228000] Hardware name: AOpen   DE7000/nMCP7ALPx-DE R1.06 Oct.19.2012, BIOS 080015  10/19/2012                                                            
[ 2696.228000] task: ffff88011a6a17e0 ti: ffff8800cbab6000 task.ti: ffff8800cbab6000                                                                            
[ 2696.228000] RIP: 0010:[<ffffffff810d0767>]  [<ffffffff810d0767>] __perf_sw_event+0x117/0x192                                                                 
[ 2696.228000] RSP: 0000:ffff8800cbab7c88  EFLAGS: 00000246                     
[ 2696.228000] RAX: ffff88011a7b5cba RBX: 0000000000000000 RCX: ffff88011a9c4000
[ 2696.228000] RDX: ffff88011a7b5c00 RSI: 0400000000000000 RDI: 4000000000000000
[ 2696.228000] RBP: ffff8800cbab7d48 R08: 0010000000000000 R09: ffff88011fc12ac0
[ 2696.228000] R10: 0000000000000000 R11: ffff880119dfcb60 R12: 0000000000000000
[ 2696.228000] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 2696.228000] FS:  0000000000bd5840(0063) GS:ffff88011fc00000(0000) knlGS:0000000000000000                                                                     
[ 2696.228000] CS:  0010 DS: 002b ES: 002b CR0: 000000008005003b                
[ 2696.228000] CR2: 0000000000bd5ac8 CR3: 00000000ca4c8000 CR4: 00000000000407f0
[ 2696.228000] DR0: 0000000000bd7000 DR1: 0000000000bd7000 DR2: 0000000000000000
[ 2696.228000] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 2696.228000] Stack:                                                           
[ 2696.228000]  0000000000000000 0000000000000000 0000000000000000 0000000000000000                                                                             
[ 2696.228000]  0000000000bd5ac8 0000000000000000 0000000000000000 0000000000000000                                                                             
[ 2696.228000]  0000000000000000 0000000000000000 0000000000000000 0000000000000000                                                                             
[ 2696.228000] Call Trace:                                                      
[ 2696.228000]  [<ffffffff81538273>] __do_page_fault+0x1b1/0x3ed                
[ 2696.228000]  [<ffffffff81009ab2>] ? native_sched_clock+0x21/0x3e             
[ 2696.228000]  [<ffffffff81069de7>] ? sched_clock_local+0x1c/0x82              
[ 2696.228000]  [<ffffffff8106a0e2>] ? sched_clock_cpu+0x8e/0xaa                
[ 2696.228000]  [<ffffffff8106a119>] ? local_clock+0x1b/0x24                    
[ 2696.228000]  [<ffffffff810cd2ad>] ? ctx_sched_in+0x35/0x185                  
[ 2696.228000]  [<ffffffff8153854e>] do_page_fault+0xc/0xe                      
[ 2696.228000]  [<ffffffff815355a2>] page_fault+0x22/0x30                       
[ 2696.228000]  [<ffffffff812a8280>] ? __put_user_4+0x20/0x30                   
[ 2696.228000]  [<ffffffff81069373>] ? schedule_tail+0x5c/0x60                  
[ 2696.228000]  [<ffffffff8153be0f>] ret_from_fork+0xf/0xb0                     
[ 2696.228000] Code: 00 48 8d 50 c0 48 85 c0 4c 0f 45 ea eb 50 41 83 bd c0 00 00 00 01 75 39 4d 39 bd c8 00 00 00 75 30 41 f6 85 90 01 00 00 01 75 26 <48> 85 db 74 4d 41 8a 85 e8 00 00 00 a8 10 74 09 f6 83 88 00 00                          
                                                                                
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