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Date: Sun, 22 May 2016 18:23:25 +0800
From: kernel test robot <fengguang.wu@...el.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: LKP <lkp@...org>, linux-kernel@...r.kernel.org,
Ingo Molnar <mingo@...nel.org>, wfg@...ux.intel.com
Subject: [sched/fair] b5179ac70d: INFO: task killall5:11539 blocked for
more than 120 seconds.
Greetings,
0day kernel testing robot got the below dmesg and the first bad commit is
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
commit b5179ac70de85ef477cedf8b026a57913754cf1e
Author: Peter Zijlstra <peterz@...radead.org>
AuthorDate: Wed May 11 16:10:34 2016 +0200
Commit: Ingo Molnar <mingo@...nel.org>
CommitDate: Thu May 12 09:55:31 2016 +0200
sched/fair: Prepare to fix fairness problems on migration
Mike reported that our recent attempt to fix migration problems:
3a47d5124a95 ("sched/fair: Fix fairness issue on migration")
broke interactivity and the signal starve test. We reverted that
commit and now let's try it again more carefully, with some other
underlying problems fixed first.
One problem is that I assumed ENQUEUE_WAKING was only set when we do a
cross-cpu wakeup (migration), which isn't true. This means we now
destroy the vruntime history of tasks and wakeup-preemption suffers.
Cure this by making my assumption true, only call
sched_class::task_waking() when we do a cross-cpu wakeup. This avoids
the indirect call in the case we do a local wakeup.
Reported-by: Mike Galbraith <mgalbraith@...e.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Andrew Hunter <ahh@...gle.com>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Mike Galbraith <efault@....de>
Cc: Morten Rasmussen <morten.rasmussen@....com>
Cc: Paul Turner <pjt@...gle.com>
Cc: Pavan Kondeti <pkondeti@...eaurora.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: byungchul.park@....com
Cc: linux-kernel@...r.kernel.org
Fixes: 3a47d5124a95 ("sched/fair: Fix fairness issue on migration")
Signed-off-by: Ingo Molnar <mingo@...nel.org>
+--------------------------------------------------+------------+------------+------------+
| | c58d25f371 | b5179ac70d | c660ebcab5 |
+--------------------------------------------------+------------+------------+------------+
| boot_successes | 1203 | 257 | 54 |
| boot_failures | 17 | 49 | 3 |
| BUG:kernel_test_crashed | 17 | 24 | 1 |
| INFO:task_blocked_for_more_than#seconds | 0 | 17 | 3 |
| RIP:__sanitizer_cov_trace_pc | 0 | 2 | |
| RIP:native_apic_mem_write | 0 | 46 | 3 |
| Kernel_panic-not_syncing:hung_task:blocked_tasks | 0 | 46 | 3 |
| backtrace:lru_add_drain_all | 0 | 29 | 2 |
| backtrace:SyS_mlockall | 0 | 28 | 2 |
| backtrace:lock_torture_writer | 0 | 36 | 3 |
| backtrace:watchdog | 0 | 46 | 3 |
| invoked_oom-killer:gfp_mask=0x | 0 | 2 | |
| Mem-Info | 0 | 2 | |
| Out_of_memory:Kill_process | 0 | 2 | |
| backtrace:vfs_read | 0 | 1 | |
| backtrace:SyS_read | 0 | 1 | |
| RIP:native_safe_halt | 0 | 10 | |
| backtrace:cpu_startup_entry | 0 | 10 | |
| RIP:lock_is_held | 0 | 7 | |
| backtrace:do_mlock | 0 | 13 | |
| backtrace:SyS_mlock | 0 | 13 | |
| RIP:debug_lockdep_rcu_enabled | 0 | 5 | |
| backtrace:do_migrate_pages | 0 | 1 | |
| backtrace:SyS_migrate_pages | 0 | 1 | |
| RIP:__fentry | 0 | 1 | |
| INFO:rcu_preempt_detected_stalls_on_CPUs/tasks | 0 | 2 | 1 |
| backtrace:do_sys_open | 0 | 3 | |
| backtrace:SyS_open | 0 | 3 | |
| backtrace:schedule_timeout | 0 | 2 | 1 |
| RIP:stutter_wait | 0 | 1 | |
| backtrace:SyS_move_pages | 0 | 1 | |
| RIP:check_flags | 0 | 6 | 1 |
| RIP:___might_sleep | 0 | 3 | 1 |
| backtrace:do_group_exit | 0 | 1 | |
| backtrace:SyS_exit_group | 0 | 1 | |
| RIP:__lock_is_held | 0 | 2 | |
| RIP:arch_local_irq_restore | 0 | 4 | |
| RIP:fgraph_trace | 0 | 1 | |
| RIP:arch_local_irq_save | 0 | 1 | |
| backtrace:SYSC_newstat | 0 | 1 | |
| backtrace:SyS_newstat | 0 | 1 | |
| RIP:arch_local_save_flags | 0 | 3 | 1 |
| backtrace:tty_ldisc_setup | 0 | 1 | |
| backtrace:tty_init_dev | 0 | 1 | |
| backtrace:_do_fork | 0 | 1 | |
| backtrace:call_usermodehelper_exec_work | 0 | 1 | |
| backtrace:SYSC_perf_event_open | 0 | 0 | 1 |
| backtrace:SyS_perf_event_open | 0 | 0 | 1 |
+--------------------------------------------------+------------+------------+------------+
[ 67.041473] init: hwclock-save main process (11520) terminated with status 70
[ 67.044842] init: plymouth-upstart-bridge main process (11521) terminated with status 1
[ 240.238015] INFO: task killall5:11539 blocked for more than 120 seconds.
[ 240.240672] Not tainted 4.6.0-rc7-00117-gb5179ac #1
[ 240.241466] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 240.242611] killall5 D ffff8800123afcb8 14072 11539 11525 0x00000000
[ 240.243688] ffff8800123afcb8 00ffffff8100f75b ffff8800103d40d8 ffff8800103d40c0
[ 240.244917] ffff88000abe8700 ffff880000610080 ffff8800123b0000 ffff8800123afe50
[ 240.246185] 0000000000000002 ffffffff81456831 ffff8800123afe48 ffff8800123afcd0
[ 240.252329] Call Trace:
[ 240.252687] [<ffffffff81456831>] ? usleep_range+0x66/0x66
[ 240.253454] [<ffffffff814530a9>] schedule+0x30/0x48
[ 240.254150] [<ffffffff8145686f>] schedule_timeout+0x3e/0xfb
[ 240.254947] [<ffffffff814571e2>] ? _raw_spin_unlock_irq+0x2c/0x4e
[ 240.255834] [<ffffffff81456831>] ? usleep_range+0x66/0x66
[ 240.256818] [<ffffffff8127fd5c>] ? __this_cpu_preempt_check+0x1c/0x1f
[ 240.257821] [<ffffffff810a4a4f>] ? trace_hardirqs_on_caller+0x1c2/0x1e1
[ 240.258805] [<ffffffff810a4a7b>] ? trace_hardirqs_on+0xd/0xf
[ 240.260274] [<ffffffff81453a06>] __wait_for_common+0x12d/0x176
[ 240.261172] [<ffffffff81453a06>] ? __wait_for_common+0x12d/0x176
[ 240.262080] [<ffffffff8109076f>] ? wake_up_q+0x4c/0x4c
[ 240.262806] [<ffffffff81453a73>] wait_for_completion+0x24/0x26
[ 240.263637] [<ffffffff8107e1f8>] flush_work+0x25d/0x284
[ 240.264659] [<ffffffff8107c770>] ? flush_workqueue_prep_pwqs+0x233/0x233
[ 240.265638] [<ffffffff81453915>] ? __wait_for_common+0x3c/0x176
[ 240.266492] [<ffffffff81145da0>] lru_add_drain_all+0x1a9/0x1cd
[ 240.267340] [<ffffffff8116a408>] SyS_mlockall+0x65/0x174
[ 240.268181] [<ffffffff81457b3c>] entry_SYSCALL_64_fastpath+0x1f/0xbd
[ 240.269180] [<ffffffff8127fd5c>] ? __this_cpu_preempt_check+0x1c/0x1f
[ 240.270133] [<ffffffff810a1d75>] ? trace_hardirqs_off_caller+0xf1/0x13e
[ 240.271115] 2 locks held by killall5/11539:
[ 240.271725] #0: (lock#2){+.+...}, at: [<ffffffff81145c2b>] lru_add_drain_all+0x34/0x1cd
[ 240.273144] #1: (cpu_hotplug.lock){++++++}, at: [<ffffffff81066077>] get_online_cpus+0x33/0x84
[ 240.274532] Sending NMI to all CPUs:
[ 240.275434] NMI backtrace for cpu 0
[ 240.276270] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6.0-rc7-00117-gb5179ac #1
[ 240.277354] task: ffffffff81a0b540 ti: ffffffff81a00000 task.ti: ffffffff81a00000
[ 240.278434] RIP: 0010:[<ffffffff810229a1>] [<ffffffff810229a1>] native_safe_halt+0x6/0x8
[ 240.279629] RSP: 0018:ffffffff81a03ec0 EFLAGS: 00000202
[ 240.280463] RAX: ffffffff81a0b540 RBX: 0000000000000000 RCX: 0000000000000000
[ 240.281502] RDX: ffffffff81a0b540 RSI: ffffffff81774d6d RDI: ffffffff8179782d
[ 240.282556] RBP: ffffffff81a03ec0 R08: 0000000000000000 R09: 0000000000000000
[ 240.283587] R10: ffffffff81a03df8 R11: 0000000000000001 R12: ffffffff81a00000
[ 240.284668] R13: 0000000000000000 R14: ffffffff81a00000 R15: ffffffff81a04000
[ 240.285724] FS: 0000000000000000(0000) GS:ffff880010200000(0000) knlGS:0000000000000000
[ 240.286896] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 240.287732] CR2: 00007f4b74889688 CR3: 00000000121e7000 CR4: 00000000000006b0
[ 240.289081] DR0: 0000000000c3b4f0 DR1: 0000000000000000 DR2: 0000000000000000
[ 240.290123] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 240.291155] Stack:
[ 240.291463] ffffffff81a03ed0 ffffffff810104cd ffffffff81a03ee0 ffffffff81010ac1
[ 240.292702] ffffffff81a03ef0 ffffffff8109fd9e ffffffff81a03f38 ffffffff8109ff09
[ 240.293780] ffffffff8108dea6 ffffffff81a00000 0000000000000002 0000000000000000
[ 240.294845] Call Trace:
[ 240.295220] [<ffffffff810104cd>] default_idle+0x24/0x37
[ 240.297607] [<ffffffff81010ac1>] arch_cpu_idle+0xf/0x11
[ 240.298394] [<ffffffff8109fd9e>] default_idle_call+0x28/0x2f
[ 240.299255] [<ffffffff8109ff09>] cpu_startup_entry+0x164/0x224
[ 240.300393] [<ffffffff8108dea6>] ? preempt_latency_start+0x21/0x57
[ 240.301316] [<ffffffff81450b71>] rest_init+0x168/0x16e
[ 240.302080] [<ffffffff81c7f0c3>] ? trace_event_define_fields_x86_irq_vector+0x2c/0x2c
[ 240.303240] [<ffffffff81c7c0cf>] start_kernel+0x449/0x456
[ 240.304098] [<ffffffff81c7b120>] ? early_idt_handler_array+0x120/0x120
[ 240.305064] [<ffffffff81c7b2b8>] x86_64_start_reservations+0x2a/0x2c
[ 240.306019] [<ffffffff81c7b3e8>] x86_64_start_kernel+0x12e/0x13d
[ 240.306902] Code: 48 89 e5 0f 09 5d c3 55 48 89 e5 9c 58 5d c3 55 48 89 e5 57 9d 5d c3 55 48 89 e5 fa 5d c3 55 48 89 e5 fb 5d c3 55 48 89 e5 fb f4 <5d> c3 55 48 89 e5 f4 5d c3 55 49 89 c9 49 89 d0 8b 07 48 89 e5
[ 240.310774] NMI backtrace for cpu 1
[ 240.311313] CPU: 1 PID: 18 Comm: khungtaskd Not tainted 4.6.0-rc7-00117-gb5179ac #1
[ 240.312645] task: ffff88000fed0480 ti: ffff88000fed4000 task.ti: ffff88000fed4000
[ 240.313730] RIP: 0010:[<ffffffff8101b7d4>] [<ffffffff8101b7d4>] native_apic_mem_write+0xc/0xe
[ 240.314964] RSP: 0018:ffff88000fed7d28 EFLAGS: 00000046
[ 240.315752] RAX: 0000000000000000 RBX: 0000000000000c00 RCX: 0000000000000002
[ 240.316969] RDX: 0000000000000002 RSI: 0000000000000c00 RDI: 0000000000000300
[ 240.318010] RBP: ffff88000fed7d28 R08: 0000000000000001 R09: 0000000000000000
[ 240.319069] R10: ffffffff8245eea0 R11: 0000000000000001 R12: 0000000000000002
[ 240.320153] R13: 0000000000000003 R14: 0000000000000001 R15: ffffffff8101c649
[ 240.321190] FS: 0000000000000000(0000) GS:ffff880010400000(0000) knlGS:0000000000000000
[ 240.322369] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 240.323214] CR2: 00007f86055713d0 CR3: 0000000001a06000 CR4: 00000000000006a0
[ 240.324519] DR0: 0000000000c3b4f0 DR1: 0000000000000000 DR2: 0000000000000000
[ 240.325581] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
[ 240.326614] Stack:
[ 240.326929] ffff88000fed7d50 ffffffff8101b883 0000000000000286 0000000000000040
[ 240.328078] 00000000001cf960 ffff88000fed7d78 ffffffff8101eb62 0000000000000003
[ 240.329176] 000000028179477f ffffffff8179477f ffff88000fed7d88 ffffffff8101ec2c
[ 240.330247] Call Trace:
[ 240.330615] [<ffffffff8101b883>] __default_send_IPI_dest_field+0x58/0x5f
[ 240.331597] [<ffffffff8101eb62>] _flat_send_IPI_mask+0x41/0x68
[ 240.332655] [<ffffffff8101ec2c>] flat_send_IPI_mask+0x11/0x13
[ 240.333515] [<ffffffff8101c664>] nmi_raise_cpu_backtrace+0x1b/0x1d
[ 240.334424] [<ffffffff812660ee>] nmi_trigger_all_cpu_backtrace+0x12a/0x293
[ 240.335441] [<ffffffff8101c695>] arch_trigger_all_cpu_backtrace+0x19/0x1b
[ 240.336749] [<ffffffff810f49cd>] watchdog+0x407/0x4b0
[ 240.337514] [<ffffffff810f45c6>] ? rcu_read_lock+0x84/0x84
[ 240.338333] [<ffffffff81086a7f>] kthread+0xe3/0xf2
[ 240.339070] [<ffffffff810a4a4f>] ? trace_hardirqs_on_caller+0x1c2/0x1e1
[ 240.340095] [<ffffffff81457d72>] ret_from_fork+0x22/0x50
[ 240.340879] [<ffffffff8108699c>] ? kthread_worker_fn+0x163/0x163
[ 240.341769] Code: 90 66 90 5d c3 55 48 89 e5 57 9d 66 66 90 66 90 5d c3 55 48 89 e5 fa 66 66 90 66 66 90 5d c3 55 89 ff 48 89 e5 89 b7 00 d0 5f ff <5d> c3 55 48 89 e5 8b 04 25 00 d3 5f ff 0f ba e0 0c 73 04 f3 90
[ 240.344776] Kernel panic - not syncing: hung_task: blocked tasks
[ 240.345779] CPU: 1 PID: 18 Comm: khungtaskd Not tainted 4.6.0-rc7-00117-gb5179ac #1
[ 240.346874] 00000000ffffffff ffff88000fed7d70 ffffffff81261683 ffffffff0fed0480
[ 240.348191] ffffffff8177e39e ffff88000fed7e00 0000000000000002 ffff88000fed7df0
[ 240.348713] ffffffff81132d3b ffff880000000008 ffff88000fed7e00 ffff88000fed7d98
[ 240.348713] Call Trace:
[ 240.348713] [<ffffffff81261683>] dump_stack+0xb1/0x103
[ 240.348713] [<ffffffff81132d3b>] panic+0xfa/0x2a7
[ 240.348713] [<ffffffff810f49d9>] watchdog+0x413/0x4b0
[ 240.348713] [<ffffffff810f45c6>] ? rcu_read_lock+0x84/0x84
[ 240.348713] [<ffffffff81086a7f>] kthread+0xe3/0xf2
[ 240.348713] [<ffffffff810a4a4f>] ? trace_hardirqs_on_caller+0x1c2/0x1e1
[ 240.348713] [<ffffffff81457d72>] ret_from_fork+0x22/0x50
[ 240.348713] [<ffffffff8108699c>] ? kthread_worker_fn+0x163/0x163
[ 240.348713] Kernel Offset: disabled
Elapsed time: 250
git bisect start c660ebcab59299b0f78d34625284a5582658bb56 2dcd0af568b0cf583645c8a317dd12e344b1c72a --
git bisect bad 9ae4681372e9ca0410ca000a0b59063d7ae07512 # 13:37 240- 15 Merge 'uml/linux-next' into devel-spot-201605221230
git bisect bad 12fa4247b3496ba213577c3631e78fe77d5c4c1f # 13:46 268- 9 Merge 'anttip-media/zd1301' into devel-spot-201605221230
git bisect bad 37c97bf7a28b106b395467b1ca3e4ba6cb730b22 # 13:52 300- 9 Merge 'linux-review/Dexuan-Cui/Drivers-hv-vmbus-fix-the-race-when-querying-updating-the-percpu-list/20160522-122421' into devel-spot-201605221230
git bisect good 801cd38d92b5318f9f5b9ac98993ddde2f20cedd # 13:58 309+ 5 0day base guard for 'devel-spot-201605221230'
git bisect bad f7df9be067160eef52f04bd2f137a20683fb1c12 # 14:05 296- 6 Merge tag 'armsoc-dt' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect good 917fa5353da05e8a0045b8acacba8d50400d5b12 # 14:12 306+ 3 Revert "phy dp83867: Fix compilation with CONFIG_OF_MDIO=m"
git bisect bad 46c13450624e36302547a2ac3695f2350fe7ffc3 # 14:20 157- 4 Merge tag 'acpi-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
git bisect good 07dc900e17a94681877b5797ce62ba97fa170400 # 15:10 308+ 3 perf/x86: Move Kconfig.perf and other perf configuration bits to events/Kconfig
git bisect bad 62a0027839a4a69bc5d2696672242019a6bb6221 # 15:18 279- 6 Merge branch 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 3f56e687a138481894a1088d5aa7d41951bdb020 # 15:25 310+ 8 perf/core: Disable the event on a truncated AUX record
git bisect good cf6ed9a6682d3f171cf9550d4bbe0ef31b768a7e # 15:31 309+ 4 Merge branch 'ras-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good 4afd0565552c87f23834db9121dd9cf6955d0b43 # 15:37 309+ 5 x86/arch_prctl/64: Restore accidentally removed put_cpu() in ARCH_SET_GS
git bisect bad 1be0eb2a97d756fb7dd8c9baf372d81fa9699c09 # 15:44 294- 7 sched/fair: Clean up scale confusion
git bisect good 2159197d66770ec01f75c93fb11dc66df81fd45b # 15:51 309+ 12 sched/core: Enable increased load resolution on 64-bit kernels
git bisect good e5ef27d0f5acf9f1db2882d7546a41c021f66820 # 15:57 310+ 4 sched: Make hrtick_notifier an explicit call
git bisect good 8c5e95548d41a48b1eb2be741107a259251ebd86 # 16:02 302+ 5 sched/core: Remove unused variable
git bisect bad b5179ac70de85ef477cedf8b026a57913754cf1e # 16:11 194- 27 sched/fair: Prepare to fix fairness problems on migration
git bisect good 4eb867651721228ee2eeae142c53378375303e8b # 16:23 301+ 2 Merge branch 'smp/hotplug' into sched/core, to resolve conflicts
git bisect good c58d25f371f5e4b2dfbec3a7bd6f3c24dd79095b # 17:10 303+ 3 sched/fair: Move record_wakee()
# first bad commit: [b5179ac70de85ef477cedf8b026a57913754cf1e] sched/fair: Prepare to fix fairness problems on migration
git bisect good c58d25f371f5e4b2dfbec3a7bd6f3c24dd79095b # 18:02 905+ 17 sched/fair: Move record_wakee()
# extra tests with DEBUG_INFO
git bisect bad b5179ac70de85ef477cedf8b026a57913754cf1e # 18:09 382- 13 sched/fair: Prepare to fix fairness problems on migration
# extra tests on HEAD of linux-devel/devel-spot-201605221230
git bisect bad c660ebcab59299b0f78d34625284a5582658bb56 # 18:09 0- 3 0day head guard for 'devel-spot-201605221230'
# extra tests on tree/branch linus/master
git bisect bad f6c658df63856db3bf8f467024b1dbee37b5399c # 18:21 151- 5 Merge tag 'for-f2fs-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
# extra tests on tree/branch linus/master
git bisect bad f6c658df63856db3bf8f467024b1dbee37b5399c # 18:21 0- 5 Merge tag 'for-f2fs-4.7' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs
# extra tests on tree/branch linux-next/master
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=quantal-core-x86_64.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu kvm64
-kernel $kernel
-initrd $initrd
-m 300
-smp 2
-device e1000,netdev=net0
-netdev user,id=net0
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
hung_task_panic=1
earlyprintk=ttyS0,115200
systemd.log_level=err
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=-1
softlockup_panic=1
nmi_watchdog=panic
oops=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
root=/dev/ram0
rw
drbd.minor_count=8
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/lkp Intel Corporation
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