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Date: Sun, 6 Jan 2013 12:07:00 +0000 From: Eric Wong <normalperson@...t.net> To: Mel Gorman <mgorman@...e.de> Cc: linux-mm@...ck.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>, Minchan Kim <minchan@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending Mel Gorman <mgorman@...e.de> wrote: > Using a 3.7.1 or 3.8-rc2 kernel, can you reproduce the problem and then > answer the following questions please? This is on my main machine running 3.8-rc2 > 1. What are the contents of /proc/vmstat at the time it is stuck? ===> /proc/vmstat <=== nr_free_pages 40305 nr_inactive_anon 25023 nr_active_anon 85684 nr_inactive_file 2614786 nr_active_file 209440 nr_unevictable 0 nr_mlock 0 nr_anon_pages 73510 nr_mapped 6017 nr_file_pages 2843997 nr_dirty 695934 nr_writeback 629239 nr_slab_reclaimable 68414 nr_slab_unreclaimable 14178 nr_page_table_pages 3136 nr_kernel_stack 314 nr_unstable 0 nr_bounce 0 nr_vmscan_write 12220042 nr_vmscan_immediate_reclaim 31213310 nr_writeback_temp 0 nr_isolated_anon 0 nr_isolated_file 0 nr_shmem 24101 nr_dirtied 534655274 nr_written 281872191 nr_anon_transparent_hugepages 24 nr_free_cma 0 nr_dirty_threshold 2790220 nr_dirty_background_threshold 29370 pgpgin 6961109514 pgpgout 1124854772 pswpin 3940 pswpout 127109 pgalloc_dma 6 pgalloc_dma32 7750674038 pgalloc_normal 78295989795 pgalloc_movable 0 pgfree 86049272519 pgactivate 21397174 pgdeactivate 423853 pgfault 473074235 pgmajfault 20093 pgrefill_dma 0 pgrefill_dma32 158720 pgrefill_normal 233024 pgrefill_movable 0 pgsteal_kswapd_dma 0 pgsteal_kswapd_dma32 450844931 pgsteal_kswapd_normal 1288388818 pgsteal_kswapd_movable 0 pgsteal_direct_dma 0 pgsteal_direct_dma32 71774371 pgsteal_direct_normal 197326432 pgsteal_direct_movable 0 pgscan_kswapd_dma 0 pgscan_kswapd_dma32 459780161 pgscan_kswapd_normal 1334016908 pgscan_kswapd_movable 0 pgscan_direct_dma 0 pgscan_direct_dma32 75632525 pgscan_direct_normal 222990090 pgscan_direct_movable 0 pgscan_direct_throttle 0 pginodesteal 228906 slabs_scanned 4077568 kswapd_inodesteal 2591027 kswapd_low_wmark_hit_quickly 674289 kswapd_high_wmark_hit_quickly 39642 kswapd_skip_congestion_wait 506 pageoutrun 2908071 allocstall 431220 pgrotated 15736438 pgmigrate_success 865182 pgmigrate_fail 78157 compact_migrate_scanned 17276417 compact_free_scanned 204979571 compact_isolated 3463801 compact_stall 349792 compact_fail 160801 compact_success 188991 htlb_buddy_alloc_success 0 htlb_buddy_alloc_fail 0 unevictable_pgs_culled 0 unevictable_pgs_scanned 0 unevictable_pgs_rescued 0 unevictable_pgs_mlocked 0 unevictable_pgs_munlocked 0 unevictable_pgs_cleared 0 unevictable_pgs_stranded 0 thp_fault_alloc 720 thp_fault_fallback 1719 thp_collapse_alloc 8631 thp_collapse_alloc_failed 4110 thp_split 700 thp_zero_page_alloc 0 thp_zero_page_alloc_failed 0 > 2. What are the contents of /proc/PID/stack for every toosleepy > process when they are stuck? pid and tid stack info, 28018 is the thread I used to automate reporting (pushed to git://bogomips.org/toosleepy.git) ===> 28014[28014]/stack <=== [<ffffffff8105a97b>] futex_wait_queue_me+0xb7/0xd2 [<ffffffff8105b7fc>] futex_wait+0xf6/0x1f6 [<ffffffff811bb3af>] cpumask_next_and+0x2b/0x37 [<ffffffff8104ebfa>] select_task_rq_fair+0x518/0x59a [<ffffffff8105c8f1>] do_futex+0xa9/0x88f [<ffffffff810509a4>] check_preempt_wakeup+0x10d/0x1a7 [<ffffffff8104757d>] check_preempt_curr+0x25/0x62 [<ffffffff8104d4cc>] wake_up_new_task+0x96/0xc2 [<ffffffff8105d1e9>] sys_futex+0x112/0x14d [<ffffffff81322a49>] stub_clone+0x69/0x90 [<ffffffff81322769>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff ===> 28014[28015]/stack <=== [<ffffffff812ae316>] dev_hard_start_xmit+0x281/0x3f1 [<ffffffff81041010>] add_wait_queue+0x14/0x40 [<ffffffff810de0bc>] poll_schedule_timeout+0x43/0x5d [<ffffffff810deb46>] do_sys_poll+0x314/0x39b [<ffffffff810de220>] pollwake+0x0/0x4e [<ffffffff8129fc1d>] release_sock+0xe5/0x11b [<ffffffff812d7f61>] tcp_recvmsg+0x713/0x846 [<ffffffff812f432c>] inet_recvmsg+0x64/0x75 [<ffffffff8129a26b>] sock_recvmsg+0x86/0x9e [<ffffffff8100541c>] emulate_vsyscall+0x1e6/0x28e [<ffffffff8129a3bc>] sockfd_lookup_light+0x1a/0x50 [<ffffffff8129c18b>] sys_recvfrom+0x110/0x128 [<ffffffff81000e34>] __switch_to+0x235/0x3c5 [<ffffffff810ca402>] kmem_cache_free+0x32/0xb9 [<ffffffff810b809d>] remove_vma+0x44/0x4c [<ffffffff810df0a5>] sys_ppoll+0xaf/0x123 [<ffffffff81322769>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff ===> 28014[28016]/stack <=== [<ffffffff812ae7ad>] dev_queue_xmit+0x327/0x336 [<ffffffff8102cb9f>] _local_bh_enable_ip+0x7a/0x8b [<ffffffff81041010>] add_wait_queue+0x14/0x40 [<ffffffff810de0bc>] poll_schedule_timeout+0x43/0x5d [<ffffffff810deb46>] do_sys_poll+0x314/0x39b [<ffffffff810de220>] pollwake+0x0/0x4e [<ffffffff8129fc1d>] release_sock+0xe5/0x11b [<ffffffff812d7f61>] tcp_recvmsg+0x713/0x846 [<ffffffff812f432c>] inet_recvmsg+0x64/0x75 [<ffffffff8129a26b>] sock_recvmsg+0x86/0x9e [<ffffffff8100541c>] emulate_vsyscall+0x1e6/0x28e [<ffffffff8129a3bc>] sockfd_lookup_light+0x1a/0x50 [<ffffffff8129c18b>] sys_recvfrom+0x110/0x128 [<ffffffff81000e34>] __switch_to+0x235/0x3c5 [<ffffffff810df0a5>] sys_ppoll+0xaf/0x123 [<ffffffff81322769>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff ===> 28014[28017]/stack <=== [<ffffffff8129fc1d>] release_sock+0xe5/0x11b [<ffffffff812a642c>] sk_stream_wait_memory+0x1f7/0x1fc [<ffffffff81040d5e>] autoremove_wake_function+0x0/0x2a [<ffffffff812d8fc3>] tcp_sendmsg+0x710/0x86d [<ffffffff8129a33e>] sock_sendmsg+0x7b/0x93 [<ffffffff8129a642>] sys_sendto+0xee/0x145 [<ffffffff8129a3bc>] sockfd_lookup_light+0x1a/0x50 [<ffffffff8129a668>] sys_sendto+0x114/0x145 [<ffffffff81000e34>] __switch_to+0x235/0x3c5 [<ffffffff81322769>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff ===> 28014[28018]/stack <=== [<ffffffff8102b23e>] do_wait+0x1a6/0x21a [<ffffffff8104757d>] check_preempt_curr+0x25/0x62 [<ffffffff8102b34a>] sys_wait4+0x98/0xb5 [<ffffffff81026321>] do_fork+0x12c/0x1a7 [<ffffffff810297b0>] child_wait_callback+0x0/0x48 [<ffffffff8131c688>] page_fault+0x28/0x30 [<ffffffff81322769>] system_call_fastpath+0x16/0x1b [<ffffffffffffffff>] 0xffffffffffffffff > 3. Can you do a sysrq+m and post the resulting dmesg? SysRq : Show Memory Mem-Info: DMA per-cpu: CPU 0: hi: 0, btch: 1 usd: 0 CPU 1: hi: 0, btch: 1 usd: 0 CPU 2: hi: 0, btch: 1 usd: 0 CPU 3: hi: 0, btch: 1 usd: 0 DMA32 per-cpu: CPU 0: hi: 186, btch: 31 usd: 4 CPU 1: hi: 186, btch: 31 usd: 181 CPU 2: hi: 186, btch: 31 usd: 46 CPU 3: hi: 186, btch: 31 usd: 13 Normal per-cpu: CPU 0: hi: 186, btch: 31 usd: 106 CPU 1: hi: 186, btch: 31 usd: 183 CPU 2: hi: 186, btch: 31 usd: 20 CPU 3: hi: 186, btch: 31 usd: 76 active_anon:85782 inactive_anon:25023 isolated_anon:0 active_file:209440 inactive_file:2610279 isolated_file:0 unevictable:0 dirty:696664 writeback:629020 unstable:0 free:44152 slab_reclaimable:68414 slab_unreclaimable:14178 mapped:6017 shmem:24101 pagetables:3136 bounce:0 free_cma:0 DMA free:15872kB min:84kB low:104kB high:124kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15640kB managed:15896kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:24kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes lowmem_reserve[]: 0 3132 12078 12078 DMA32 free:85264kB min:17504kB low:21880kB high:26256kB active_anon:46808kB inactive_anon:21212kB active_file:122040kB inactive_file:2833064kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:3208020kB managed:3185856kB mlocked:0kB dirty:92120kB writeback:225356kB mapped:356kB shmem:6776kB slab_reclaimable:67156kB slab_unreclaimable:7412kB kernel_stack:80kB pagetables:816kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 8946 8946 Normal free:75472kB min:49988kB low:62484kB high:74980kB active_anon:296320kB inactive_anon:78880kB active_file:715720kB inactive_file:7608052kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:9160704kB managed:9084264kB mlocked:0kB dirty:2694536kB writeback:2290724kB mapped:23712kB shmem:89628kB slab_reclaimable:206500kB slab_unreclaimable:49276kB kernel_stack:2432kB pagetables:11728kB unstable:0kB bounce:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no lowmem_reserve[]: 0 0 0 0 DMA: 0*4kB 0*8kB 0*16kB 0*32kB 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U) 1*2048kB (R) 3*4096kB (M) = 15872kB DMA32: 1681*4kB (UEM) 3196*8kB (UEM) 3063*16kB (UEM) 63*32kB (UEM) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB (R) 0*4096kB = 85364kB Normal: 8874*4kB (UEM) 1885*8kB (UEM) 581*16kB (UEM) 412*32kB (UM) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 1*2048kB (R) 0*4096kB = 75104kB 2839464 total pagecache pages 891 pages in swap cache Swap cache stats: add 131049, delete 130158, find 1103447/1103954 Free swap = 4152384kB Total swap = 4194300kB 3145712 pages RAM 73642 pages reserved 3313060 pages shared 1432170 pages non-shared -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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