On May 14 21:15, Ben Hutchings wrote: > On Wed, 2014-05-14 at 12:21 -0400, Paul Gortmaker wrote: > > On 14-05-13 03:45 AM, Alexandra N. Kossovsky wrote: > > > Hello. > > > > > > One of my computers fails to boot with 3.2.57-rt kernel, i686. > > > The kernel is the Debian one: linux-image-3.2.0-4-rt-686-pae, version > > > 3.2.57-3. Same non-rt kernel boots fine. All newer -rt kernels (I've > > > tried kernels starting from 3.6) boot fine. > > > You can find some details of the hardware in > > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=746232, > > > including lspci output and full kernel output. > > > > One of the more recent additions was to ensure RCU_BOOST was > > auto selected via Kconfig dependencies. It might not have > > been present in 3.2.57-rt; not sure w/o checking what debian > > has in there. But you might want to check the .config you > > have to see whether it is on or off, and try enabling it. > [...] > > $ grep RCU_BOOST /usr/src/linux-headers-3.2.0-4-rt-686-pae/.config > # CONFIG_RCU_BOOST is not set $ grep BOOST .config CONFIG_RCU_BOOST=y CONFIG_RCU_BOOST_PRIO=1 CONFIG_RCU_BOOST_DELAY=500 Does not help. Should I play with PRIO and DELAY numbers? Log: [ 5.414059] Switching to clocksource tsc [ 64.503649] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 6, t=15002 jiffies) [ 64.503655] INFO: Stall ended before state dump start [ 244.054622] INFO: task swapper/0:1 blocked for more than 120 seconds. [ 244.075069] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 244.088152] swapper/0 D e9f40680 0 1 0 0x00000000 [ 244.094720] e28d56f0 00000046 00000df4 e9f40680 e28d58c4 c102815b c14c7680 c14c7680 [ 244.103035] c1547fdc c12c35f2 000035c0 c102815b 00000001 c12c6149 e2818800 c12c357c [ 244.111342] c119012e 00000004 c13fc07c e2818800 00000000 c13fc07c c12c6276 ffffffff [ 244.119649] Call Trace: [ 244.122163] [<c102815b>] ? get_parent_ip+0x8/0x19 [ 244.127012] [<c12c35f2>] ? _raw_spin_lock_irqsave+0x1b/0x39 [ 244.132726] [<c102815b>] ? get_parent_ip+0x8/0x19 [ 244.137576] [<c12c6149>] ? sub_preempt_count+0x68/0x84 [ 244.142859] [<c12c357c>] ? _raw_spin_unlock_irqrestore+0x1f/0x29 [ 244.149031] [<c119012e>] ? vgacon_scroll+0x109/0x19a [ 244.154142] [<c12c6276>] ? __atomic_notifier_call_chain+0x33/0x3c [ 244.160374] [<c12c26ca>] ? schedule+0x65/0x7e [ 244.164871] [<c12c28f2>] ? schedule_timeout+0x1f/0xaf [ 244.170064] [<c102815b>] ? get_parent_ip+0x8/0x19 [ 244.174909] [<c12c6149>] ? sub_preempt_count+0x68/0x84 [ 244.180188] [<c102815b>] ? get_parent_ip+0x8/0x19 [ 244.185032] [<c102815b>] ? get_parent_ip+0x8/0x19 [ 244.189880] [<c12c6149>] ? sub_preempt_count+0x68/0x84 [ 244.195166] [<c102b005>] ? migrate_enable+0xb3/0x135 [ 244.200272] [<c12c259c>] ? wait_for_common+0x7f/0xe1 [ 244.205377] [<c102aed0>] ? try_to_wake_up+0x183/0x183 [ 244.210577] [<c10781d5>] ? __call_rcu+0xe7/0xe7 [ 244.215257] [<c1044f64>] ? wait_rcu_gp+0x2e/0x33 [ 244.220019] [<c1044f69>] ? wait_rcu_gp+0x33/0x33 [ 244.224790] [<c1020000>] ? kmap_atomic_prot+0x7b/0xd9 [ 244.229979] [<c102b005>] ? migrate_enable+0xb3/0x135 [ 244.235097] [<c119bd45>] ? acpi_post_unmap_gar+0x78/0x93 [ 244.240562] [<c11b9ff2>] ? apei_res_sub+0xd2/0xd2 [ 244.245407] [<c11ba007>] ? post_unmap_gar_callback+0x15/0x18 [ 244.251208] [<c11b9e14>] ? apei_exec_for_each_entry+0x56/0x68 [ 244.257105] [<c1436be8>] ? setup_erst_disable+0xd/0xd [ 244.262302] [<c11b9e44>] ? apei_exec_post_unmap_gars+0xe/0x10 [ 244.268183] [<c1436e18>] ? erst_init+0x230/0x29d [ 244.272956] [<c11ef1ca>] ? bus_add_driver+0x17d/0x1ce [ 244.278158] [<c1436a00>] ? acpi_initialize_subsystem+0x83/0x83 [ 244.284140] [<c11efbb8>] ? driver_register+0x75/0xd6 [ 244.289252] [<c100115c>] ? do_one_initcall+0x66/0x10e [ 244.294445] [<c14137d7>] ? kernel_init+0xfc/0x173 [ 244.299291] [<c14136db>] ? start_kernel+0x314/0x314 [ 244.304310] [<c12c7d3e>] ? kernel_thread_helper+0x6/0xd [ 244.309676] INFO: task rcub/1:13 blocked for more than 120 seconds. [ 244.315993] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 244.323885] rcub/1 D e9f40680 0 13 2 0x00000000 [ 244.330414] e28eec10 00000046 6572756c e9f40680 30056543 00000001 c14c7680 c14c7680 [ 244.338732] c104ba42 c1471680 c10061df e9f406c4 ff48e500 ffffffff e28d56f0 c12cc3d8 [ 244.347049] e28d56f0 c12cc3d8 c1020f7b [ 244.350142] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=60034 jiffies) [ 244.350143] INFO: Stall ended before state dump start [ 244.365081] e28d56f0 e9f40680 00000062 c102a24f 00000078 [ 244.370853] Call Trace: [ 364.546439] [<c104ba42>] ? sched_clock_cpu+0x10/0x146 [ 364.551634] [<c10061df>] ? __cycles_2_ns+0x19/0x7e [ 364.556567] [<c1020f7b>] ? check_class_changed+0x25/0x33 [ 364.562020] [<c102a24f>] ? rt_mutex_setprio+0x10d/0x134 [ 364.567384] [<c12c26ca>] ? schedule+0x65/0x7e [ 364.571882] [<c12c2f87>] ? __rt_mutex_slowlock+0x79/0xb7 [ 364.577336] [<c12c3086>] ? rt_mutex_slowlock+0xc1/0x116 [ 364.582701] [<c1024abb>] ? finish_task_switch+0x66/0x9f [ 364.588066] [<c10579a7>] ? rt_mutex_fastlock.constprop.14+0x12/0x2a [ 364.594472] [<c1076fba>] ? rcu_boost_kthread+0xdf/0x125 [ 364.599843] [<c1020101>] ? __kunmap_atomic+0x2f/0x6a [ 364.604949] [<c1076edb>] ? trace_rcu_utilization+0x50/0x50 [ 364.610573] [<c1046c54>] ? kthread+0x64/0x69 [ 364.614986] [<c1046bf0>] ? flush_kthread_worker+0x7d/0x7d [ 364.620525] [<c12c7d3e>] ? kernel_thread_helper+0x6/0xd Sasha. -- Alexandra N. Kossovsky OKTET Labs (http://www.oktetlabs.ru/) -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
