> Interesting. That commit is not supposed to make any semantic > difference at all. And even if we do end up in the retry path, the > arch/x86/mm/fault.c code is very explicitly designed so that it > retries only _once_. > > Michel, any ideas? I could see problems with the mmap_sem if > VM_FAULT_OOM is set at the same time as VM_FAULT_RETRY, but I can't > see how that could ever happen. > > Anybody? > > CAI, can you get any output from sysrq-W when this happens? Hi Linus, please see below, CAI Qian [ 580.191996] SysRq : Show Blocked State [ 580.192024] task PC stack pid father [ 580.192024] Sched Debug Version: v0.09, 2.6.36+ #22 [ 580.192024] now at 580203.234510 msecs [ 580.192024] .jiffies : 4295247509 [ 580.192024] .sysctl_sched_latency : 18.000000 [ 580.192024] .sysctl_sched_min_granularity : 2.250000 [ 580.192024] .sysctl_sched_wakeup_granularity : 3.000000 [ 580.192024] .sysctl_sched_child_runs_first : 0 [ 580.192024] .sysctl_sched_features : 31855 [ 580.192024] .sysctl_sched_tunable_scaling : 1 (logaritmic) [ 580.192024] [ 580.192024] cpu#0, 2826.528 MHz [ 580.192024] .nr_running : 1 [ 580.192024] .load : 1024 [ 580.192024] .nr_switches : 35799 [ 580.192024] .nr_load_updates : 128515 [ 580.192024] .nr_uninterruptible : 0 [ 580.192024] .next_balance : 4295.247545 [ 580.192024] .curr->pid : 1366 [ 580.192024] .clock : 580191.025058 [ 580.192024] .cpu_load[0] : 1024 [ 580.192024] .cpu_load[1] : 1016 [ 580.192024] .cpu_load[2] : 957 [ 580.192024] .cpu_load[3] : 872 [ 580.192024] .cpu_load[4] : 799 [ 580.192024] .yld_count : 140 [ 580.192024] .sched_switch : 0 [ 580.192024] .sched_count : 44224 [ 580.192024] .sched_goidle : 6268 [ 580.192024] .avg_idle : 1000000 [ 580.192024] .ttwu_count : 11413 [ 580.192024] .ttwu_local : 8684 [ 580.192024] .bkl_count : 0 [ 580.192024] [ 580.192024] cfs_rq[0]:/ [ 580.192024] .exec_clock : 125215.744234 [ 580.192024] .MIN_vruntime : 0.000001 [ 580.192024] .min_vruntime : 45692.541683 [ 580.192024] .max_vruntime : 0.000001 [ 580.192024] .spread : 0.000000 [ 580.192024] .spread0 : 0.000000 [ 580.192024] .nr_running : 1 [ 580.192024] .load : 1024 [ 580.192024] .nr_spread_over : 4 [ 580.192024] .shares : 0 [ 580.192024] [ 580.192024] rt_rq[0]:/ [ 580.192024] .rt_nr_running : 0 [ 580.192024] .rt_throttled : 0 [ 580.192024] .rt_time : 0.000000 [ 580.192024] .rt_runtime : 950.000000 [ 580.192024] [ 580.192024] runnable tasks: [ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep [ 580.192024] ---------------------------------------------------------------------------------------------------------- [ 580.192024] R sendmail 1366 45692.541683 9276 120 45692.541683 46469.996943 411694.347209 / [ 580.192024] [ 580.192024] cpu#1, 2826.528 MHz [ 580.192024] .nr_running : 2 [ 580.192024] .load : 2048 [ 580.192024] .nr_switches : 46514 [ 580.192024] .nr_load_updates : 130936 [ 580.192024] .nr_uninterruptible : 0 [ 580.192024] .next_balance : 4295.247917 [ 580.192024] .curr->pid : 1295 [ 580.192024] .clock : 580557.002284 [ 580.192024] .cpu_load[0] : 2048 [ 580.192024] .cpu_load[1] : 1520 [ 580.192024] .cpu_load[2] : 1679 [ 580.192024] .cpu_load[3] : 1513 [ 580.192024] .cpu_load[4] : 1688 [ 580.192024] .yld_count : 124 [ 580.192024] .sched_switch : 0 [ 580.192024] .sched_count : 54526 [ 580.192024] .sched_goidle : 6063 [ 580.192024] .avg_idle : 1000000 [ 580.192024] .ttwu_count : 9145 [ 580.192024] .ttwu_local : 5902 [ 580.192024] .bkl_count : 0 [ 580.192024] [ 580.192024] cfs_rq[1]:/ [ 580.192024] .exec_clock : 122340.374690 [ 580.192024] .MIN_vruntime : 51807.120538 [ 580.192024] .min_vruntime : 51807.120538 [ 580.192024] .max_vruntime : 51807.120538 [ 580.192024] .spread : 0.000000 [ 580.192024] .spread0 : 6114.578855 [ 580.192024] .nr_running : 2 [ 580.192024] .load : 2048 [ 580.192024] .nr_spread_over : 1 [ 580.192024] .shares : 0 [ 580.192024] [ 580.192024] rt_rq[1]:/ [ 580.192024] .rt_nr_running : 0 [ 580.192024] .rt_throttled : 0 [ 580.192024] .rt_time : 0.000000 [ 580.192024] .rt_runtime : 950.000000 [ 580.192024] [ 580.192024] runnable tasks: [ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep [ 580.192024] ---------------------------------------------------------------------------------------------------------- [ 580.192024] kworker/1:1 30 51798.120538 3390 120 51798.120538 14.488166 578377.071351 / [ 580.192024] Rhald-addon-inpu 1295 52383.947330 3612 120 52388.948353 21427.078504 454223.044707 / [ 580.192024] sshd 1494 51807.120538 4985 120 51807.120538 41792.344148 43008.912088 / [ 580.192024] [ 580.192024] cpu#2, 2826.528 MHz [ 580.192024] .nr_running : 3 [ 580.192024] .load : 3072 [ 580.192024] .nr_switches : 38687 [ 580.192024] .nr_load_updates : 128857 [ 580.192024] .nr_uninterruptible : 0 [ 580.192024] .next_balance : 4295.248178 [ 580.192024] .curr->pid : 1002 [ 580.192024] .clock : 580830.001334 [ 580.192024] .cpu_load[0] : 3072 [ 580.192024] .cpu_load[1] : 2688 [ 580.192024] .cpu_load[2] : 2231 [ 580.192024] .cpu_load[3] : 2408 [ 580.192024] .cpu_load[4] : 2606 [ 580.192024] .yld_count : 0 [ 580.192024] .sched_switch : 0 [ 580.192024] .sched_count : 49977 [ 580.192024] .sched_goidle : 4442 [ 580.192024] .avg_idle : 1000000 [ 580.192024] .ttwu_count : 7958 [ 580.192024] .ttwu_local : 5710 [ 580.192024] .bkl_count : 0 [ 580.192024] [ 580.192024] cfs_rq[2]:/ [ 580.192024] .exec_clock : 122185.543310 [ 580.192024] .MIN_vruntime : 49939.236793 [ 580.192024] .min_vruntime : 49948.236793 [ 580.192024] .max_vruntime : 49939.236793 [ 580.192024] .spread : 0.000000 [ 580.192024] .spread0 : 4255.695110 [ 580.192024] .nr_running : 3 [ 580.192024] .load : 3072 [ 580.192024] .nr_spread_over : 5 [ 580.192024] .shares : 0 [ 580.192024] [ 580.192024] rt_rq[2]:/ [ 580.192024] .rt_nr_running : 0 [ 580.192024] .rt_throttled : 0 [ 580.192024] .rt_time : 0.000000 [ 580.192024] .rt_runtime : 950.000000 [ 580.192024] [ 580.192024] runnable tasks: [ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep [ 580.192024] ---------------------------------------------------------------------------------------------------------- [ 580.192024] kworker/2:1 31 49939.236793 3110 120 49939.236793 16.244410 577598.865226 / [ 580.192024] kswapd0 33 49939.236793 5021 120 49939.236793 39855.128906 456899.562827 / [ 580.192024] R irqbalance 1002 50700.231326 10599 120 50705.232536 37995.007739 451842.051677 / [ 580.192024] [ 580.192024] cpu#3, 2826.528 MHz [ 580.192024] .nr_running : 2 [ 580.192024] .load : 2048 [ 580.192024] .nr_switches : 28514 [ 580.192024] .nr_load_updates : 142983 [ 580.192024] .nr_uninterruptible : 0 [ 580.192024] .next_balance : 4295.248441 [ 580.192024] .curr->pid : 1517 [ 580.192024] .clock : 581105.001367 [ 580.192024] .cpu_load[0] : 2048 [ 580.192024] .cpu_load[1] : 2048 [ 580.192024] .cpu_load[2] : 6702 [ 580.192024] .cpu_load[3] : 6746 [ 580.192024] .cpu_load[4] : 5982 [ 580.192024] .yld_count : 179 [ 580.192024] .sched_switch : 0 [ 580.192024] .sched_count : 38579 [ 580.192024] .sched_goidle : 5981 [ 580.192024] .avg_idle : 1000000 [ 580.192024] .ttwu_count : 8881 [ 580.192024] .ttwu_local : 7007 [ 580.192024] .bkl_count : 0 [ 580.192024] [ 580.192024] cfs_rq[3]:/ [ 580.192024] .exec_clock : 135810.747600 [ 580.192024] .MIN_vruntime : 64636.582469 [ 580.192024] .min_vruntime : 64645.582469 [ 580.192024] .max_vruntime : 64636.582469 [ 580.192024] .spread : 0.000000 [ 580.192024] .spread0 : 18953.040786 [ 580.192024] .nr_running : 3 [ 580.192024] .load : 8148 [ 580.192024] .nr_spread_over : 4 [ 580.192024] .shares : 0 [ 580.192024] [ 580.192024] rt_rq[3]:/ [ 580.192024] .rt_nr_running : 0 [ 580.192024] .rt_throttled : 0 [ 580.192024] .rt_time : 0.000000 [ 580.192024] .rt_runtime : 950.000000 [ 580.192024] [ 580.192024] runnable tasks: [ 580.192024] task PID tree-key switches prio exec-runtime sum-exec sum-sleep [ 580.192024] ---------------------------------------------------------------------------------------------------------- [ 580.192024] kworker/3:1 32 64636.582469 4854 120 64636.582469 856.962108 576060.366837 / [ 580.192024] audispd 952 64636.582469 96 112 64636.582469 7948.252669 553967.243338 / [ 580.192024] R oom01 1517 65744.576906 64 120 65748.577669 11613.730238 0.000000 / [ 580.192024] -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . 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