On Mon, 1 Dec 2014 15:08:13 -0800
"Paul E. McKenney" <paul...@linux.vnet.ibm.com> wrote:
> Well, this turned out to be way simpler than I expected. Passes
> light rcutorture testing. Sometimes you get lucky...
Linus, Paul and others, I finally got a call trace with
only CONFIG_TREE_PREEMPT_RCU *disabled* using Paul's patch (to trigger
it I compiled PHP with make -j8).
Dec 2 14:24:39 tux kernel: [ 8475.941616] conftest[9730]: segfault at 0 ip
0000000000400640 sp 00007fffa67ab300 error 4 in conftest[400000+1000]
Dec 2 14:24:40 tux kernel: [ 8476.104725] conftest[9753]: segfault at 0 ip
00007f6863024906 sp 00007fff0e31cc48 error 4 in
libc-2.19.so[7f6862efe000+1a1000]
Dec 2 14:25:54 tux kernel: [ 8550.791697] INFO: rcu_sched detected stalls on
CPUs/tasks: { 4} (detected by 0, t=60002 jiffies, g=112854, c=112853, q=0)
Dec 2 14:25:54 tux kernel: [ 8550.791702] Task dump for CPU 4:
Dec 2 14:25:54 tux kernel: [ 8550.791703] cc1 R running task
0 14344 14340 0x00080008
Dec 2 14:25:54 tux kernel: [ 8550.791706] 000000001bcebcd8 ffff880100000003
ffffffff810cb7f1 ffff88021f5f5c00
Dec 2 14:25:54 tux kernel: [ 8550.791708] ffff88011bcebfd8 ffff88011bcebce8
ffffffff811fb970 ffff8802149a2a00
Dec 2 14:25:54 tux kernel: [ 8550.791710] ffff8802149a2cc8 ffff88011bcebd28
ffffffff8103e979 ffff88020ed01398
Dec 2 14:25:54 tux kernel: [ 8550.791712] Call Trace:
Dec 2 14:25:54 tux kernel: [ 8550.791718] [<ffffffff810cb7f1>] ?
release_pages+0xa1/0x1e0
Dec 2 14:25:54 tux kernel: [ 8550.791722] [<ffffffff811fb970>] ?
cpumask_any_but+0x30/0x40
Dec 2 14:25:54 tux kernel: [ 8550.791725] [<ffffffff8103e979>] ?
flush_tlb_page+0x49/0xf0
Dec 2 14:25:54 tux kernel: [ 8550.791727] [<ffffffff810cbe72>] ?
lru_cache_add_active_or_unevictable+0x22/0x90
Dec 2 14:25:54 tux kernel: [ 8550.791731] [<ffffffff810fc4c2>] ?
alloc_pages_vma+0x72/0x130
Dec 2 14:25:54 tux kernel: [ 8550.791733] [<ffffffff810cbe72>] ?
lru_cache_add_active_or_unevictable+0x22/0x90
Dec 2 14:25:54 tux kernel: [ 8550.791735] [<ffffffff810e5220>] ?
handle_mm_fault+0x3a0/0xaf0
Dec 2 14:25:54 tux kernel: [ 8550.791737] [<ffffffff81039074>] ?
__do_page_fault+0x224/0x4c0
Dec 2 14:25:54 tux kernel: [ 8550.791740] [<ffffffff8110d54c>] ?
new_sync_write+0x7c/0xb0
Dec 2 14:25:55 tux kernel: [ 8550.791743] [<ffffffff8114765c>] ?
fsnotify+0x27c/0x350
Dec 2 14:25:55 tux kernel: [ 8550.791746] [<ffffffff81087233>] ?
rcu_eqs_enter+0x93/0xa0
Dec 2 14:25:55 tux kernel: [ 8550.791748] [<ffffffff81087a5e>] ?
rcu_user_enter+0xe/0x10
Dec 2 14:25:55 tux kernel: [ 8550.791749] [<ffffffff8103938a>] ?
do_page_fault+0x5a/0x70
Dec 2 14:25:55 tux kernel: [ 8550.791752] [<ffffffff8139d9d2>] ?
page_fault+0x22/0x30
If you need more info/testing, just ask.
--
Linux 3.17.0-dirty: Shuffling Zombie Juror
http://www.youtube.com/DanielFragaBR
http://exchangewar.info
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