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Message-ID: <747214d9-be8c-2bbb-9b19-147541b3d439@I-love.SAKURA.ne.jp> Date: Fri, 15 Jul 2016 20:42:40 +0900 From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> To: Ondrej Kozina <okozina@...hat.com>, Michal Hocko <mhocko@...nel.org> Cc: Mikulas Patocka <mpatocka@...hat.com>, Jerome Marchand <jmarchan@...hat.com>, Stanislav Kozina <skozina@...hat.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, dm-devel@...hat.com Subject: Re: System freezes after OOM On 2016/07/15 2:07, Ondrej Kozina wrote: > On 07/14/2016 05:31 PM, Michal Hocko wrote: >> On Thu 14-07-16 16:08:28, Ondrej Kozina wrote: >> [...] >>> As Mikulas pointed out, this doesn't work. The system froze as well with the >>> patch above. Will try to tweak the patch with Mikulas's suggestion... >> >> Thank you for testing! Do you happen to have traces of the frozen >> processes? Does the flusher still gets throttled because the bias it >> gets is not sufficient. Or does it get throttled at a different place? >> > > Sure. Here it is (including sysrq+t and sysrq+w output): https://okozina.fedorapeople.org/bugs/swap_on_dmcrypt/4.7.0-rc7+/1/4.7.0-rc7+.log > Oh, this resembles another dm-crypt lockup problem reported last month. ( http://lkml.kernel.org/r/20160616212641.GA3308@sig21.net ) In Johannes's case, there are so many pending kcryptd_crypt work requests and mempool_alloc() is waiting at throttle_vm_writeout() or shrink_inactive_list(). [ 2378.279029] kswapd0 D ffff88003744f538 0 766 2 0x00000000 [ 2378.286167] ffff88003744f538 00ff88011b5ccd80 ffff88011b5d62d8 ffff88011ae58000 [ 2378.293628] ffff880037450000 ffff880037450000 00000001000984f2 ffff88003744f570 [ 2378.301168] ffff88011b5ccd80 ffff880037450000 ffff88003744f550 ffffffff81845cec [ 2378.308674] Call Trace: [ 2378.311154] [<ffffffff81845cec>] schedule+0x8b/0xa3 [ 2378.316153] [<ffffffff81849b5b>] schedule_timeout+0x20b/0x285 [ 2378.322028] [<ffffffff810e6da6>] ? init_timer_key+0x112/0x112 [ 2378.327931] [<ffffffff81845070>] io_schedule_timeout+0xa0/0x102 [ 2378.333960] [<ffffffff81845070>] ? io_schedule_timeout+0xa0/0x102 [ 2378.340166] [<ffffffff81162c2b>] mempool_alloc+0x123/0x154 [ 2378.345781] [<ffffffff810bdd00>] ? wait_woken+0x72/0x72 [ 2378.351148] [<ffffffff8133fdc1>] bio_alloc_bioset+0xe8/0x1d7 [ 2378.356910] [<ffffffff816342ea>] alloc_tio+0x2d/0x47 [ 2378.361996] [<ffffffff8163587e>] __split_and_process_bio+0x310/0x3a3 [ 2378.368470] [<ffffffff81635e15>] dm_make_request+0xb5/0xe2 [ 2378.374078] [<ffffffff81347ae7>] generic_make_request+0xcc/0x180 [ 2378.380206] [<ffffffff81347c98>] submit_bio+0xfd/0x145 [ 2378.385482] [<ffffffff81198948>] __swap_writepage+0x202/0x225 [ 2378.391349] [<ffffffff810a5eeb>] ? preempt_count_sub+0xf0/0x100 [ 2378.397398] [<ffffffff8184a5f7>] ? _raw_spin_unlock+0x31/0x44 [ 2378.403273] [<ffffffff8119a903>] ? page_swapcount+0x45/0x4c [ 2378.408984] [<ffffffff811989a5>] swap_writepage+0x3a/0x3e [ 2378.414530] [<ffffffff811727ef>] pageout.isra.16+0x160/0x2a7 [ 2378.420320] [<ffffffff81173a8f>] shrink_page_list+0x5a0/0x8c4 [ 2378.426197] [<ffffffff81174489>] shrink_inactive_list+0x29e/0x4a1 [ 2378.432434] [<ffffffff81174e8b>] shrink_zone_memcg+0x4c1/0x661 [ 2378.438406] [<ffffffff81175107>] shrink_zone+0xdc/0x1e5 [ 2378.443742] [<ffffffff81175107>] ? shrink_zone+0xdc/0x1e5 [ 2378.449238] [<ffffffff8117628f>] kswapd+0x6df/0x814 [ 2378.454222] [<ffffffff81175bb0>] ? mem_cgroup_shrink_node_zone+0x209/0x209 [ 2378.461196] [<ffffffff8109f208>] kthread+0xff/0x107 [ 2378.466182] [<ffffffff8184b1f2>] ret_from_fork+0x22/0x50 [ 2378.471631] [<ffffffff8109f109>] ? kthread_create_on_node+0x1ea/0x1ea [ 2378.769494] kworker/u8:4 D ffff8800c5dc3508 0 1592 2 0x00000000 [ 2378.776582] Workqueue: kcryptd kcryptd_crypt [ 2378.780887] ffff8800c5dc3508 00ff88011b7ccd80 ffff88011b7d62d8 ffff88011ae5a900 [ 2378.788399] ffff88011a605200 ffff8800c5dc4000 00000001000983f7 ffff8800c5dc3540 [ 2378.795930] ffff88011b7ccd80 0000000000000000 ffff8800c5dc3520 ffffffff81845cec [ 2378.803408] Call Trace: [ 2378.805879] [<ffffffff81845cec>] schedule+0x8b/0xa3 [ 2378.810908] [<ffffffff81849b5b>] schedule_timeout+0x20b/0x285 [ 2378.816783] [<ffffffff810e6da6>] ? init_timer_key+0x112/0x112 [ 2378.822677] [<ffffffff81845070>] io_schedule_timeout+0xa0/0x102 [ 2378.828716] [<ffffffff81845070>] ? io_schedule_timeout+0xa0/0x102 [ 2378.834956] [<ffffffff8117d5c0>] congestion_wait+0x84/0x160 [ 2378.840658] [<ffffffff810bdd00>] ? wait_woken+0x72/0x72 [ 2378.845997] [<ffffffff8116c32f>] throttle_vm_writeout+0x88/0xab [ 2378.852036] [<ffffffff81174fff>] shrink_zone_memcg+0x635/0x661 [ 2378.857982] [<ffffffff81175107>] shrink_zone+0xdc/0x1e5 [ 2378.863309] [<ffffffff81175107>] ? shrink_zone+0xdc/0x1e5 [ 2378.868832] [<ffffffff811753b5>] do_try_to_free_pages+0x1a5/0x2c3 [ 2378.875028] [<ffffffff811755f6>] try_to_free_pages+0x123/0x21f [ 2378.880972] [<ffffffff81168216>] __alloc_pages_nodemask+0x4c9/0x978 [ 2378.887385] [<ffffffff8138027a>] ? debug_smp_processor_id+0x17/0x19 [ 2378.893782] [<ffffffff8119fb2a>] new_slab+0xbc/0x3bb [ 2378.898868] [<ffffffff811a1acd>] ___slab_alloc.constprop.22+0x2fb/0x37b [ 2378.905634] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2378.911659] [<ffffffff8101f5ba>] ? sched_clock+0x9/0xd [ 2378.916909] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2378.922325] [<ffffffff810c6438>] ? __lock_acquire.isra.16+0x55e/0xb4c [ 2378.928877] [<ffffffff8101f5ba>] ? sched_clock+0x9/0xd [ 2378.934138] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2378.939555] [<ffffffff810c6438>] ? __lock_acquire.isra.16+0x55e/0xb4c [ 2378.946125] [<ffffffff811a1ba4>] __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2378.953289] [<ffffffff811a1ba4>] ? __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2378.960630] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2378.966706] [<ffffffff811a1c78>] kmem_cache_alloc+0xa0/0x1d6 [ 2378.972503] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2378.978567] [<ffffffff81162a88>] mempool_alloc_slab+0x15/0x17 [ 2378.984426] [<ffffffff81162b7a>] mempool_alloc+0x72/0x154 [ 2378.989930] [<ffffffff810c4b45>] ? lockdep_init_map+0xc9/0x5a3 [ 2378.995866] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2379.001300] [<ffffffff8133fdc1>] bio_alloc_bioset+0xe8/0x1d7 [ 2379.007107] [<ffffffff81643127>] kcryptd_crypt+0x1ab/0x325 [ 2379.012704] [<ffffffff810998fd>] ? process_one_work+0x1ad/0x4e2 [ 2379.018753] [<ffffffff810999d3>] process_one_work+0x283/0x4e2 [ 2379.024629] [<ffffffff810c502d>] ? put_lock_stats.isra.9+0xe/0x20 [ 2379.030851] [<ffffffff8109a860>] worker_thread+0x285/0x370 [ 2379.036423] [<ffffffff8109a5db>] ? rescuer_thread+0x2d1/0x2d1 [ 2379.042309] [<ffffffff8109f208>] kthread+0xff/0x107 [ 2379.047310] [<ffffffff8184b1f2>] ret_from_fork+0x22/0x50 [ 2379.052726] [<ffffffff8109f109>] ? kthread_create_on_node+0x1ea/0x1ea [ 2379.059328] kworker/u8:6 D ffff8800c5ec3508 0 1594 2 0x00000000 [ 2379.066468] Workqueue: kcryptd kcryptd_crypt [ 2379.070808] ffff8800c5ec3508 00ff88011b7ccd80 ffff88011b7d62d8 ffff88011ae5a900 [ 2379.078296] ffff88003749a900 ffff8800c5ec4000 0000000100098467 ffff8800c5ec3540 [ 2379.085836] ffff88011b7ccd80 0000000000000000 ffff8800c5ec3520 ffffffff81845cec [ 2379.093315] Call Trace: [ 2379.095776] [<ffffffff81845cec>] schedule+0x8b/0xa3 [ 2379.100785] [<ffffffff81849b5b>] schedule_timeout+0x20b/0x285 [ 2379.106627] [<ffffffff810e6da6>] ? init_timer_key+0x112/0x112 [ 2379.112494] [<ffffffff81845070>] io_schedule_timeout+0xa0/0x102 [ 2379.118524] [<ffffffff81845070>] ? io_schedule_timeout+0xa0/0x102 [ 2379.124740] [<ffffffff8117d5c0>] congestion_wait+0x84/0x160 [ 2379.130432] [<ffffffff810bdd00>] ? wait_woken+0x72/0x72 [ 2379.135771] [<ffffffff8116c32f>] throttle_vm_writeout+0x88/0xab [ 2379.141839] [<ffffffff81174fff>] shrink_zone_memcg+0x635/0x661 [ 2379.147810] [<ffffffff81175107>] shrink_zone+0xdc/0x1e5 [ 2379.153155] [<ffffffff81175107>] ? shrink_zone+0xdc/0x1e5 [ 2379.158651] [<ffffffff811753b5>] do_try_to_free_pages+0x1a5/0x2c3 [ 2379.164881] [<ffffffff811755f6>] try_to_free_pages+0x123/0x21f [ 2379.170861] [<ffffffff81168216>] __alloc_pages_nodemask+0x4c9/0x978 [ 2379.177292] [<ffffffff811a1776>] ? get_partial_node.isra.19+0x353/0x3af [ 2379.184026] [<ffffffff8119fb2a>] new_slab+0xbc/0x3bb [ 2379.189103] [<ffffffff811a1acd>] ___slab_alloc.constprop.22+0x2fb/0x37b [ 2379.195843] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2379.201895] [<ffffffff81049da2>] ? glue_xts_crypt_128bit+0x1a6/0x1d8 [ 2379.208357] [<ffffffff8101f5ba>] ? sched_clock+0x9/0xd [ 2379.213610] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2379.219050] [<ffffffff810c6438>] ? __lock_acquire.isra.16+0x55e/0xb4c [ 2379.225596] [<ffffffff811a1ba4>] __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2379.232769] [<ffffffff811a1ba4>] ? __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2379.240143] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2379.246177] [<ffffffff811a1c78>] kmem_cache_alloc+0xa0/0x1d6 [ 2379.251957] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2379.258024] [<ffffffff81162a88>] mempool_alloc_slab+0x15/0x17 [ 2379.263907] [<ffffffff81162b7a>] mempool_alloc+0x72/0x154 [ 2379.269403] [<ffffffff810c4b45>] ? lockdep_init_map+0xc9/0x5a3 [ 2379.275354] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2379.280754] [<ffffffff8133fdc1>] bio_alloc_bioset+0xe8/0x1d7 [ 2379.286535] [<ffffffff81643127>] kcryptd_crypt+0x1ab/0x325 [ 2379.292143] [<ffffffff810998fd>] ? process_one_work+0x1ad/0x4e2 [ 2379.298208] [<ffffffff810999d3>] process_one_work+0x283/0x4e2 [ 2379.304117] [<ffffffff810c502d>] ? put_lock_stats.isra.9+0xe/0x20 [ 2379.310341] [<ffffffff8109a860>] worker_thread+0x285/0x370 [ 2379.315946] [<ffffffff8109a5db>] ? rescuer_thread+0x2d1/0x2d1 [ 2379.321840] [<ffffffff8109f208>] kthread+0xff/0x107 [ 2379.326825] [<ffffffff8184b1f2>] ret_from_fork+0x22/0x50 [ 2379.332299] [<ffffffff8109f109>] ? kthread_create_on_node+0x1ea/0x1ea [ 2385.193584] kworker/u8:1 D ffff880022e634b8 0 2342 2 0x00000000 [ 2385.200692] Workqueue: kcryptd kcryptd_crypt [ 2385.205023] ffff880022e634b8 00ff88011b3ccd80 ffff88011b3d62d8 ffff88011ae45200 [ 2385.212554] ffff88011a472900 ffff880022e64000 0000000100098b0a ffff880022e634f0 [ 2385.220052] ffff88011b3ccd80 ffff8800c5b19350 ffff880022e634d0 ffffffff81845cec [ 2385.227547] Call Trace: [ 2385.230002] [<ffffffff81845cec>] schedule+0x8b/0xa3 [ 2385.235001] [<ffffffff81849b5b>] schedule_timeout+0x20b/0x285 [ 2385.240893] [<ffffffff810e6da6>] ? init_timer_key+0x112/0x112 [ 2385.246787] [<ffffffff81849c33>] schedule_timeout_uninterruptible+0x1e/0x20 [ 2385.253858] [<ffffffff81849c33>] ? schedule_timeout_uninterruptible+0x1e/0x20 [ 2385.261140] [<ffffffff8117d72e>] wait_iff_congested+0x92/0x1b4 [ 2385.267083] [<ffffffff810bdd00>] ? wait_woken+0x72/0x72 [ 2385.272448] [<ffffffff811745c7>] shrink_inactive_list+0x3dc/0x4a1 [ 2385.278662] [<ffffffff81174e8b>] shrink_zone_memcg+0x4c1/0x661 [ 2385.284643] [<ffffffff81175107>] shrink_zone+0xdc/0x1e5 [ 2385.290006] [<ffffffff81175107>] ? shrink_zone+0xdc/0x1e5 [ 2385.295518] [<ffffffff811753b5>] do_try_to_free_pages+0x1a5/0x2c3 [ 2385.301739] [<ffffffff811755f6>] try_to_free_pages+0x123/0x21f [ 2385.307710] [<ffffffff81168216>] __alloc_pages_nodemask+0x4c9/0x978 [ 2385.314097] [<ffffffff8138027a>] ? debug_smp_processor_id+0x17/0x19 [ 2385.320509] [<ffffffff8119fb2a>] new_slab+0xbc/0x3bb [ 2385.325598] [<ffffffff811a1acd>] ___slab_alloc.constprop.22+0x2fb/0x37b [ 2385.332320] [<ffffffff8138027a>] ? debug_smp_processor_id+0x17/0x19 [ 2385.338726] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2385.344784] [<ffffffff8101f5ba>] ? sched_clock+0x9/0xd [ 2385.350052] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2385.355494] [<ffffffff810c6438>] ? __lock_acquire.isra.16+0x55e/0xb4c [ 2385.362063] [<ffffffff811a1ba4>] __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2385.369247] [<ffffffff811a1ba4>] ? __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2385.376630] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2385.382689] [<ffffffff811a1c78>] kmem_cache_alloc+0xa0/0x1d6 [ 2385.388493] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2385.394544] [<ffffffff81162a88>] mempool_alloc_slab+0x15/0x17 [ 2385.400410] [<ffffffff81162b7a>] mempool_alloc+0x72/0x154 [ 2385.405915] [<ffffffff810c4b45>] ? lockdep_init_map+0xc9/0x5a3 [ 2385.411875] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2385.417311] [<ffffffff8133fdc1>] bio_alloc_bioset+0xe8/0x1d7 [ 2385.423082] [<ffffffff81643127>] kcryptd_crypt+0x1ab/0x325 [ 2385.428704] [<ffffffff810998fd>] ? process_one_work+0x1ad/0x4e2 [ 2385.434771] [<ffffffff810999d3>] process_one_work+0x283/0x4e2 [ 2385.440664] [<ffffffff810c502d>] ? put_lock_stats.isra.9+0xe/0x20 [ 2385.446904] [<ffffffff8109a860>] worker_thread+0x285/0x370 [ 2385.452510] [<ffffffff8109a5db>] ? rescuer_thread+0x2d1/0x2d1 [ 2385.458385] [<ffffffff8109f208>] kthread+0xff/0x107 [ 2385.463379] [<ffffffff8184b1f2>] ret_from_fork+0x22/0x50 [ 2385.468776] [<ffffffff8109f109>] ? kthread_create_on_node+0x1ea/0x1ea [ 2386.089621] kworker/u8:0 D ffff88010cd434b8 0 15543 2 0x00000000 [ 2386.096770] Workqueue: kcryptd kcryptd_crypt [ 2386.101060] ffff88010cd434b8 00ff88011b1ccd80 ffff88011b1d62d8 ffffffff81e1d540 [ 2386.108598] ffff8800c00ca900 ffff88010cd44000 00000001000982fe ffff88010cd434f0 [ 2386.116102] ffff88011b1ccd80 ffff8800c5b19350 ffff88010cd434d0 ffffffff81845cec [ 2386.123651] Call Trace: [ 2386.126132] [<ffffffff81845cec>] schedule+0x8b/0xa3 [ 2386.131167] [<ffffffff81849b5b>] schedule_timeout+0x20b/0x285 [ 2386.137017] [<ffffffff810e6da6>] ? init_timer_key+0x112/0x112 [ 2386.142902] [<ffffffff81849c33>] schedule_timeout_uninterruptible+0x1e/0x20 [ 2386.149999] [<ffffffff81849c33>] ? schedule_timeout_uninterruptible+0x1e/0x20 [ 2386.157271] [<ffffffff8117d72e>] wait_iff_congested+0x92/0x1b4 [ 2386.163258] [<ffffffff810bdd00>] ? wait_woken+0x72/0x72 [ 2386.168622] [<ffffffff811745c7>] shrink_inactive_list+0x3dc/0x4a1 [ 2386.174862] [<ffffffff81174e8b>] shrink_zone_memcg+0x4c1/0x661 [ 2386.180834] [<ffffffff81175107>] shrink_zone+0xdc/0x1e5 [ 2386.186154] [<ffffffff81175107>] ? shrink_zone+0xdc/0x1e5 [ 2386.191691] [<ffffffff811753b5>] do_try_to_free_pages+0x1a5/0x2c3 [ 2386.197931] [<ffffffff811755f6>] try_to_free_pages+0x123/0x21f [ 2386.203893] [<ffffffff81168216>] __alloc_pages_nodemask+0x4c9/0x978 [ 2386.210314] [<ffffffff811a1776>] ? get_partial_node.isra.19+0x353/0x3af [ 2386.217057] [<ffffffff8119fb97>] new_slab+0x129/0x3bb [ 2386.222246] [<ffffffff811a1acd>] ___slab_alloc.constprop.22+0x2fb/0x37b [ 2386.228979] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2386.235039] [<ffffffff81049da2>] ? glue_xts_crypt_128bit+0x1a6/0x1d8 [ 2386.241529] [<ffffffff8101f5ba>] ? sched_clock+0x9/0xd [ 2386.246790] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2386.252248] [<ffffffff810c6438>] ? __lock_acquire.isra.16+0x55e/0xb4c [ 2386.258863] [<ffffffff811a1ba4>] __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2386.266027] [<ffffffff811a1ba4>] ? __slab_alloc.isra.17.constprop.21+0x57/0x8b [ 2386.273358] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2386.279383] [<ffffffff811a1c78>] kmem_cache_alloc+0xa0/0x1d6 [ 2386.285196] [<ffffffff81162a88>] ? mempool_alloc_slab+0x15/0x17 [ 2386.291246] [<ffffffff81162a88>] mempool_alloc_slab+0x15/0x17 [ 2386.297146] [<ffffffff81162b7a>] mempool_alloc+0x72/0x154 [ 2386.302669] [<ffffffff810c4b45>] ? lockdep_init_map+0xc9/0x5a3 [ 2386.308622] [<ffffffff810ae420>] ? local_clock+0x20/0x22 [ 2386.314073] [<ffffffff8133fdc1>] bio_alloc_bioset+0xe8/0x1d7 [ 2386.319843] [<ffffffff81643127>] kcryptd_crypt+0x1ab/0x325 [ 2386.325443] [<ffffffff810998fd>] ? process_one_work+0x1ad/0x4e2 [ 2386.331482] [<ffffffff810999d3>] process_one_work+0x283/0x4e2 [ 2386.337331] [<ffffffff810c502d>] ? put_lock_stats.isra.9+0xe/0x20 [ 2386.343528] [<ffffffff8109a860>] worker_thread+0x285/0x370 [ 2386.349143] [<ffffffff8109a5db>] ? rescuer_thread+0x2d1/0x2d1 [ 2386.355055] [<ffffffff8109f208>] kthread+0xff/0x107 [ 2386.360048] [<ffffffff8184b1f2>] ret_from_fork+0x22/0x50 [ 2386.365471] [<ffffffff8109f109>] ? kthread_create_on_node+0x1ea/0x1ea [ 2419.047134] workqueue kcryptd: flags=0x2a [ 2419.051178] pwq 8: cpus=0-3 flags=0x4 nice=0 active=4/4 [ 2419.056687] in-flight: 1592:kcryptd_crypt, 1594:kcryptd_crypt, 2342:kcryptd_crypt, 15543:kcryptd_crypt [ 2419.066479] delayed: kcryptd_crypt, kcryptd_crypt, (...snipped...) kcryptd_crypt, (...too long to finish...) Why can't we stop queuing so many kcryptd_crypt work requests?
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