Date:	Wed, 24 Jul 2013 05:33:12 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: spinlock lockup, rcu stalls etc.

On Tue, Jul 23, 2013 at 12:28:35PM -0400, Dave Jones wrote:
> Woke up to a box that I could log into, but would hang as soon as I tried to
> do any disk IO.  This is what hit the logs before that.
> 
> [28853.503179] hrtimer: interrupt took 4847 ns
> [28918.966734] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=6502 jiffies, g=655835, c=655834, q=0)
> [28918.968079] INFO: Stall ended before state dump start
> [28932.599607] BUG: spinlock lockup suspected on CPU#0, trinity-child2/6990
> [28932.600419]  lock: inode_sb_list_lock+0x0/0x80, .magic: dead4ead, .owner: trinity-child1/6763, .owner_cpu: 1
> [28932.601597] CPU: 0 PID: 6990 Comm: trinity-child2 Not tainted 3.11.0-rc2+ #54 
> [28932.604385]  0000000088c64840 ffff88022a567eb0 ffffffff81701c14 ffff8801f6cd5500
> [28932.605322]  ffff88022a567ed0 ffffffff81701cd4 ffffffff81c04640 0000000088c64840
> [28932.606666] BUG: spinlock lockup suspected on CPU#2, trinity-child2/6764
> [28932.606669]  lock: inode_sb_list_lock+0x0/0x80, .magic: dead4ead, .owner: trinity-child1/6763, .owner_cpu: 1
> [28932.606259]  ffff88022a567ef8 ffffffff81328e07 ffffffff81c04640 ffffffff81c04658
> [28932.609238] Call Trace:
> [28932.609545]  [<ffffffff81701c14>] dump_stack+0x4e/0x82
> [28932.610167]  [<ffffffff81701cd4>] spin_dump+0x8c/0x91
> [28932.610781]  [<ffffffff81328e07>] do_raw_spin_lock+0x67/0x130
> [28932.611476]  [<ffffffff811f2a70>] ? fdatawait_one_bdev+0x20/0x20
> [28932.612202]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.612866]  [<ffffffff811fe5fc>] ? iterate_bdevs+0x2c/0x120
> [28932.613550]  [<ffffffff811fe5fc>] iterate_bdevs+0x2c/0x120
> [28932.614213]  [<ffffffff811f2ce3>] sys_sync+0x63/0x90

Lots and lots of concurrent sync() system calls.  But one actual sync()
execution would serve any number of sync() requests, as long as each
request was initiated prior to the start of the sync() execution.
Would it make sense to enable concurrent sync() system calls to take
advantage of each others' work?

							Thanx, Paul

> [28932.615727]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.617231] sending NMI to all CPUs:
> [28932.617235] CPU: 2 PID: 6764 Comm: trinity-child2 Not tainted 3.11.0-rc2+ #54 
> [28932.617238]  0000000088c64840 ffff88021b703d68 ffffffff81701c14 ffff8801f6cd5500
> [28932.617239]  ffff88021b703d88 ffffffff81701cd4 ffffffff81c04640 0000000088c64840
> [28932.617241]  ffff88021b703db0 ffffffff81328e07 ffffffff81c04640 ffffffff81c04658
> [28932.617241] Call Trace:
> [28932.617244]  [<ffffffff81701c14>] dump_stack+0x4e/0x82
> [28932.617245]  [<ffffffff81701cd4>] spin_dump+0x8c/0x91
> [28932.617247]  [<ffffffff81328e07>] do_raw_spin_lock+0x67/0x130
> [28932.617249]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.617251]  [<ffffffff811ec948>] ? sync_inodes_sb+0x228/0x2a0
> [28932.617253]  [<ffffffff811ec948>] sync_inodes_sb+0x228/0x2a0
> [28932.617255]  [<ffffffff81708c1f>] ? wait_for_completion+0xdf/0x110
> [28932.617258]  [<ffffffff8109837d>] ? get_parent_ip+0xd/0x50
> [28932.617259]  [<ffffffff811f2a30>] ? generic_write_sync+0x70/0x70
> [28932.617260]  [<ffffffff811f2a49>] sync_inodes_one_sb+0x19/0x20
> [28932.617263]  [<ffffffff811c2b12>] iterate_supers+0xb2/0x110
> [28932.617265]  [<ffffffff811f2cb5>] sys_sync+0x35/0x90
> [28932.617266]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.635092] BUG: spinlock lockup suspected on CPU#3, trinity-child3/6975
> [28932.635095]  lock: inode_sb_list_lock+0x0/0x80, .magic: dead4ead, .owner: trinity-child1/6763, .owner_cpu: 1
> [28932.635098] CPU: 3 PID: 6975 Comm: trinity-child3 Not tainted 3.11.0-rc2+ #54 
> [28932.635101]  0000000088c64840 ffff88022dd43d68 ffffffff81701c14 ffff8801f6cd5500
> [28932.635102]  ffff88022dd43d88 ffffffff81701cd4 ffffffff81c04640 0000000088c64840
> [28932.635104]  ffff88022dd43db0 ffffffff81328e07 ffffffff81c04640 ffffffff81c04658
> [28932.635104] Call Trace:
> [28932.635106]  [<ffffffff81701c14>] dump_stack+0x4e/0x82
> [28932.635108]  [<ffffffff81701cd4>] spin_dump+0x8c/0x91
> [28932.635109]  [<ffffffff81328e07>] do_raw_spin_lock+0x67/0x130
> [28932.635110]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.635112]  [<ffffffff811ec948>] ? sync_inodes_sb+0x228/0x2a0
> [28932.635114]  [<ffffffff811ec948>] sync_inodes_sb+0x228/0x2a0
> [28932.635117]  [<ffffffff81708c1f>] ? wait_for_completion+0xdf/0x110
> [28932.635118]  [<ffffffff8109837d>] ? get_parent_ip+0xd/0x50
> [28932.635120]  [<ffffffff811f2a30>] ? generic_write_sync+0x70/0x70
> [28932.635121]  [<ffffffff811f2a49>] sync_inodes_one_sb+0x19/0x20
> [28932.635123]  [<ffffffff811c2b12>] iterate_supers+0xb2/0x110
> [28932.635124]  [<ffffffff811f2cb5>] sys_sync+0x35/0x90
> [28932.635126]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.686393] NMI backtrace for cpu 0
> [28932.687256] CPU: 0 PID: 6990 Comm: trinity-child2 Not tainted 3.11.0-rc2+ #54 
> [28932.689034] task: ffff8801f6cd3fc0 ti: ffff88022a566000 task.ti: ffff88022a566000
> [28932.689926] RIP: 0010:[<ffffffff81326097>]  [<ffffffff81326097>] find_next_bit+0xa7/0xe0
> [28932.690819] RSP: 0018:ffff88022a567e48  EFLAGS: 00000002
> [28932.691693] RAX: ffffffffffffffff RBX: 0000000000000001 RCX: 0000000000000001
> [28932.692555] RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000000
> [28932.693396] RBP: ffff88022a567e48 R08: ffff8802437ec540 R09: 0000000000000001
> [28932.694236] R10: 0000000000000000 R11: 0000000000000001 R12: ffff8802437ec540
> [28932.695071] R13: ffff8802437eda40 R14: 0000000000080000 R15: 000000000000d010
> [28932.695893] FS:  00007f7aeb601740(0000) GS:ffff880244800000(0000) knlGS:0000000000000000
> [28932.696709] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [28932.697530] CR2: 00000000020491c8 CR3: 000000021c3c3000 CR4: 00000000001407f0
> [28932.698358] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [28932.699193] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
> [28932.700019] Stack:
> [28932.700838]  ffff88022a567ea8 ffffffff81033b96 0000000000000292 000000000000d008
> [28932.701678]  0000000000000002 0000000000000000 0000000000000000 0000000000002710
> [28932.702526]  0000000088c64840 0000000088c64840 0000000000000510 0000000000000002
> [28932.703371] Call Trace:
> [28932.704204]  [<ffffffff81033b96>] __x2apic_send_IPI_mask+0x96/0x1c0
> [28932.705055]  [<ffffffff81033cdc>] x2apic_send_IPI_all+0x1c/0x20
> [28932.705908]  [<ffffffff81030115>] arch_trigger_all_cpu_backtrace+0x65/0xa0
> [28932.706752]  [<ffffffff81328e0c>] do_raw_spin_lock+0x6c/0x130
> [28932.707583]  [<ffffffff811f2a70>] ? fdatawait_one_bdev+0x20/0x20
> [28932.708392]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.709197]  [<ffffffff811fe5fc>] ? iterate_bdevs+0x2c/0x120
> [28932.710004]  [<ffffffff811fe5fc>] iterate_bdevs+0x2c/0x120
> [28932.710799]  [<ffffffff811f2ce3>] sys_sync+0x63/0x90
> [28932.711600]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.712399] Code: 00 00 48 c7 c2 ff ff ff ff 29 f1 48 d3 ea 48 21 d0 74 41 f3 48 0f bc c0 48 01 f8 5d c3 0f 1f 80 00 00 00 00 48 c7 c0 ff ff ff ff <48> d3 e0 49 23 00 48 83 fe 3f 76 c6 48 85 c0 75 d7 49 83 c0 08 
> [28932.714185] NMI backtrace for cpu 3
> [28932.714188] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: 27.792 msecs
> [28932.715902] CPU: 3 PID: 6975 Comm: trinity-child3 Not tainted 3.11.0-rc2+ #54 
> [28932.717707] task: ffff8801f3553fc0 ti: ffff88022dd42000 task.ti: ffff88022dd42000
> [28932.718623] RIP: 0010:[<ffffffff81328e22>]  [<ffffffff81328e22>] do_raw_spin_lock+0x82/0x130
> [28932.719554] RSP: 0000:ffff88022dd43d98  EFLAGS: 00000202
> [28932.720483] RAX: 00000000000000ed RBX: ffffffff81c04640 RCX: 0000000000000000
> [28932.721423] RDX: 00000000000000ef RSI: 0000000000000001 RDI: 0000000000000001
> [28932.722363] RBP: ffff88022dd43db0 R08: 0000000000000002 R09: 0000000000000000
> [28932.723293] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000088c64840
> [28932.724219] R13: 0000000088c64840 R14: ffff88023b57f648 R15: ffff88023b57f858
> [28932.725130] FS:  00007fe3310bf740(0000) GS:ffff880244e00000(0000) knlGS:0000000000000000
> [28932.726043] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [28932.726928] CR2: 0000000001bbadf8 CR3: 000000022ad51000 CR4: 00000000001407e0
> [28932.727827] DR0: 0000000002297000 DR1: 0000000000000000 DR2: 0000000000000000
> [28932.728727] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
> [28932.729613] Stack:
> [28932.730491]  ffffffff81c04640 ffffffff81c04658 ffff88023d0e8110 ffff88022dd43dd8
> [28932.731400]  ffffffff8170b620 ffffffff811ec948 ffff88023b57f648 ffff88023b57f6d0
> [28932.732310]  ffff88022dd43f18 ffffffff811ec948 7fffffffffffffff ffff88023d0e8000
> [28932.733225] Call Trace:
> [28932.734130]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.735042]  [<ffffffff811ec948>] ? sync_inodes_sb+0x228/0x2a0
> [28932.735958]  [<ffffffff811ec948>] sync_inodes_sb+0x228/0x2a0
> [28932.736871]  [<ffffffff81708c1f>] ? wait_for_completion+0xdf/0x110
> [28932.737788]  [<ffffffff8109837d>] ? get_parent_ip+0xd/0x50
> [28932.738705]  [<ffffffff811f2a30>] ? generic_write_sync+0x70/0x70
> [28932.739622]  [<ffffffff811f2a49>] sync_inodes_one_sb+0x19/0x20
> [28932.740541]  [<ffffffff811c2b12>] iterate_supers+0xb2/0x110
> [28932.741461]  [<ffffffff811f2cb5>] sys_sync+0x35/0x90
> [28932.742376]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.743274] Code: 00 48 c7 c6 ac c1 a4 81 48 89 df e8 41 8e 3d 00 e8 a4 72 d0 ff b8 00 01 00 00 f0 66 0f c1 03 0f b6 d4 38 c2 74 09 f3 90 0f b6 03 <38> c2 75 f7 eb 1a 0f 1f 84 00 00 00 00 00 8d 8a 00 01 00 00 89 
> [28932.745205] NMI backtrace for cpu 2
> [28932.745207] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: 58.812 msecs
> [28932.747019] CPU: 2 PID: 6764 Comm: trinity-child2 Not tainted 3.11.0-rc2+ #54 
> [28932.748893] task: ffff880242d63fc0 ti: ffff88021b702000 task.ti: ffff88021b702000
> [28932.749849] RIP: 0010:[<ffffffff81328e1f>]  [<ffffffff81328e1f>] do_raw_spin_lock+0x7f/0x130
> [28932.750818] RSP: 0018:ffff88021b703d98  EFLAGS: 00000202
> [28932.751778] RAX: 00000000000000ed RBX: ffffffff81c04640 RCX: 0000000000000000
> [28932.752740] RDX: 00000000000000ee RSI: 0000000000000001 RDI: 0000000000000001
> [28932.753699] RBP: ffff88021b703db0 R08: 0000000000000002 R09: 0000000000000000
> [28932.754645] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000088c64840
> [28932.755592] R13: 0000000088c64840 R14: ffff8802328e5548 R15: ffff8802328e5758
> [28932.756547] FS:  00007fbbe649e740(0000) GS:ffff880244c00000(0000) knlGS:0000000000000000
> [28932.757512] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [28932.758469] CR2: 00007fcd8f15d000 CR3: 00000001cc9cd000 CR4: 00000000001407e0
> [28932.759438] DR0: 000000000232b000 DR1: 0000000000000000 DR2: 0000000000000000
> [28932.760405] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
> [28932.761363] Stack:
> [28932.762312]  ffffffff81c04640 ffffffff81c04658 ffff88023c33e8c0 ffff88021b703dd8
> [28932.763289]  ffffffff8170b620 ffffffff811ec948 ffff8802328e5548 ffff8802328e55d0
> [28932.764261]  ffff88021b703f18 ffffffff811ec948 7fffffffffffffff ffff88023c33e7b0
> [28932.765229] Call Trace:
> [28932.766189]  [<ffffffff8170b620>] _raw_spin_lock+0x60/0x80
> [28932.767157]  [<ffffffff811ec948>] ? sync_inodes_sb+0x228/0x2a0
> [28932.768125]  [<ffffffff811ec948>] sync_inodes_sb+0x228/0x2a0
> [28932.769093]  [<ffffffff81708c1f>] ? wait_for_completion+0xdf/0x110
> [28932.770068]  [<ffffffff8109837d>] ? get_parent_ip+0xd/0x50
> [28932.771045]  [<ffffffff811f2a30>] ? generic_write_sync+0x70/0x70
> [28932.772003]  [<ffffffff811f2a49>] sync_inodes_one_sb+0x19/0x20
> [28932.772939]  [<ffffffff811c2b12>] iterate_supers+0xb2/0x110
> [28932.773871]  [<ffffffff811f2cb5>] sys_sync+0x35/0x90
> [28932.774790]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.775691] Code: 92 00 00 00 48 c7 c6 ac c1 a4 81 48 89 df e8 41 8e 3d 00 e8 a4 72 d0 ff b8 00 01 00 00 f0 66 0f c1 03 0f b6 d4 38 c2 74 09 f3 90 <0f> b6 03 38 c2 75 f7 eb 1a 0f 1f 84 00 00 00 00 00 8d 8a 00 01 
> [28932.777623] NMI backtrace for cpu 1
> [28932.777625] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: 91.230 msecs
> [28932.779440] CPU: 1 PID: 6763 Comm: trinity-child1 Not tainted 3.11.0-rc2+ #54 
> [28932.781322] task: ffff8801f6cd5500 ti: ffff8801f37f0000 task.ti: ffff8801f37f0000
> [28932.782283] RIP: 0010:[<ffffffff81710385>]  [<ffffffff81710385>] add_preempt_count+0x25/0xf0
> [28932.783258] RSP: 0018:ffff880244a03d18  EFLAGS: 00000046
> [28932.784226] RAX: ffff8801f37f1fd8 RBX: 0000000000000001 RCX: 0000000000000000
> [28932.785198] RDX: 0000000000000103 RSI: 0000000000000103 RDI: 0000000000000001
> [28932.786164] RBP: ffff880244a03d20 R08: 0000000000000000 R09: 0000000000000000
> [28932.787125] R10: 0000000000000001 R11: 0000000000000001 R12: 00000000000059a4
> [28932.788078] R13: 0000000000000001 R14: 00000000bb2c46dc R15: ffff8801f37f1fd8
> [28932.789040] FS:  00007fe3310bf740(0000) GS:ffff880244a00000(0000) knlGS:0000000000000000
> [28932.790007] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [28932.790964] CR2: 00007fc75af18070 CR3: 00000001ebf1f000 CR4: 00000000001407e0
> [28932.791934] DR0: 0000000001ef0000 DR1: 0000000000000000 DR2: 0000000000000000
> [28932.792903] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
> [28932.793859] Stack:
> [28932.794811]  00000000bb2c1760 ffff880244a03d58 ffffffff81320851 ffff8801f6cd5500
> [28932.795786]  ffff8802360d9860 0000000000000020 0000000000002cbb ffff8801f0e75c78
> [28932.796770]  ffff880244a03d68 ffffffff81320789 ffff880244a03d80 ffffffff810816d4
> [28932.797761] Call Trace:
> [28932.798737]  <IRQ> 
> [28932.799715]  [<ffffffff81320851>] delay_tsc+0x61/0xe0
> [28932.800693]  [<ffffffff81320789>] __const_udelay+0x29/0x30
> [28932.801674]  [<ffffffff810816d4>] __rcu_read_unlock+0x54/0xa0
> [28932.802657]  [<ffffffff810af531>] cpuacct_account_field+0xf1/0x200
> [28932.803645]  [<ffffffff810af445>] ? cpuacct_account_field+0x5/0x200
> [28932.804613]  [<ffffffff8109e430>] account_system_time+0xb0/0x1b0
> [28932.805561]  [<ffffffff8109e565>] __vtime_account_system+0x35/0x40
> [28932.806506]  [<ffffffff8109e59d>] vtime_account_system.part.2+0x2d/0x50
> [28932.807445]  [<ffffffff8109e8e5>] vtime_account_irq_enter+0x55/0x80
> [28932.808365]  [<ffffffff8105f42f>] irq_enter+0x4f/0x90
> [28932.809269]  [<ffffffff81716a15>] smp_apic_timer_interrupt+0x35/0x60
> [28932.810156]  [<ffffffff817156af>] apic_timer_interrupt+0x6f/0x80
> [28932.811030]  [<ffffffff8170c6a0>] ? retint_restore_args+0xe/0xe
> [28932.811895]  [<ffffffff8105eff1>] ? __do_softirq+0xb1/0x440
> [28932.812756]  [<ffffffff8105f53d>] irq_exit+0xcd/0xe0
> [28932.813618]  [<ffffffff81716a25>] smp_apic_timer_interrupt+0x45/0x60
> [28932.814483]  [<ffffffff817156af>] apic_timer_interrupt+0x6f/0x80
> [28932.815345]  <EOI> 
> [28932.816207]  [<ffffffff8170c6a0>] ? retint_restore_args+0xe/0xe
> [28932.817069]  [<ffffffff810c1275>] ? lock_acquired+0x105/0x3f0
> [28932.817924]  [<ffffffff811ec8e2>] ? sync_inodes_sb+0x1c2/0x2a0
> [28932.818767]  [<ffffffff8170b62c>] _raw_spin_lock+0x6c/0x80
> [28932.819616]  [<ffffffff811ec8e2>] ? sync_inodes_sb+0x1c2/0x2a0
> [28932.820468]  [<ffffffff811ec8e2>] sync_inodes_sb+0x1c2/0x2a0
> [28932.821310]  [<ffffffff81708c1f>] ? wait_for_completion+0xdf/0x110
> [28932.822147]  [<ffffffff8109837d>] ? get_parent_ip+0xd/0x50
> [28932.822984]  [<ffffffff811f2a30>] ? generic_write_sync+0x70/0x70
> [28932.823819]  [<ffffffff811f2a49>] sync_inodes_one_sb+0x19/0x20
> [28932.824649]  [<ffffffff811c2b12>] iterate_supers+0xb2/0x110
> [28932.825477]  [<ffffffff811f2cb5>] sys_sync+0x35/0x90
> [28932.826300]  [<ffffffff81714c54>] tracesys+0xdd/0xe2
> [28932.827119]  [<ffffffffa0000000>] ? 0xffffffff9fffffff
> [28932.827938] Code: c2 fe ff ff c9 c3 0f 1f 44 00 00 8b 0d 0d 3c 9b 00 55 65 48 8b 04 25 f0 b9 00 00 48 89 e5 53 89 fb 85 c9 75 59 8b 90 44 e0 ff ff <85> d2 0f 88 87 00 00 00 01 b8 44 e0 ff ff 80 b8 44 e0 ff ff f4 
> [28932.829761] INFO: NMI handler (arch_trigger_all_cpu_backtrace_handler) took too long to run: 143.366 msecs
> [29113.907186] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=26007 jiffies, g=655835, c=655834, q=0)
> [29113.909408] INFO: Stall ended before state dump start
> [29308.847645] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=45512 jiffies, g=655835, c=655834, q=0)
> [29308.849897] INFO: Stall ended before state dump start
> [29503.788103] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=65017 jiffies, g=655835, c=655834, q=0)
> [29503.790346] INFO: Stall ended before state dump start
> [29698.728562] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=84522 jiffies, g=655835, c=655834, q=0)
> [29698.730820] INFO: Stall ended before state dump start
> [29893.669020] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=104027 jiffies, g=655835, c=655834, q=0)
> [29893.671281] INFO: Stall ended before state dump start
> [30088.609477] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=123532 jiffies, g=655835, c=655834, q=0)
> [30088.611737] INFO: Stall ended before state dump start
> [30283.549935] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=143037 jiffies, g=655835, c=655834, q=0)
> [30283.552212] INFO: Stall ended before state dump start
> [30478.490392] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=162542 jiffies, g=655835, c=655834, q=0)
> [30478.492697] INFO: Stall ended before state dump start
> [30673.430849] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=182047 jiffies, g=655835, c=655834, q=0)
> [30673.433188] INFO: Stall ended before state dump start
> [30868.371305] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=201552 jiffies, g=655835, c=655834, q=0)
> [30868.373659] INFO: Stall ended before state dump start
> [31063.311762] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=221057 jiffies, g=655835, c=655834, q=0)
> [31063.314138] INFO: Stall ended before state dump start
> [31258.252218] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=240562 jiffies, g=655835, c=655834, q=0)
> [31258.254620] INFO: Stall ended before state dump start
> [31453.192674] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=260067 jiffies, g=655835, c=655834, q=0)
> [31453.195094] INFO: Stall ended before state dump start
> [31648.133129] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=279572 jiffies, g=655835, c=655834, q=0)
> [31648.135568] INFO: Stall ended before state dump start
> [31843.073585] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=299077 jiffies, g=655835, c=655834, q=0)
> [31843.076054] INFO: Stall ended before state dump start
> [32038.014040] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=318582 jiffies, g=655835, c=655834, q=0)
> [32038.016541] INFO: Stall ended before state dump start
> [32232.954496] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=338087 jiffies, g=655835, c=655834, q=0)
> [32232.957026] INFO: Stall ended before state dump start
> [32427.894950] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=357592 jiffies, g=655835, c=655834, q=0)
> [32427.897513] INFO: Stall ended before state dump start
> [32622.835405] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=377097 jiffies, g=655835, c=655834, q=0)
> [32622.837989] INFO: Stall ended before state dump start
> [32817.775860] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=396602 jiffies, g=655835, c=655834, q=0)
> [32817.778470] INFO: Stall ended before state dump start
> [33012.716315] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=416107 jiffies, g=655835, c=655834, q=0)
> [33012.718960] INFO: Stall ended before state dump start
> [33207.656769] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=435612 jiffies, g=655835, c=655834, q=0)
> [33207.659440] INFO: Stall ended before state dump start
> [33402.597223] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=455117 jiffies, g=655835, c=655834, q=0)
> [33402.599928] INFO: Stall ended before state dump start
> [33597.537677] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=474622 jiffies, g=655835, c=655834, q=0)
> [33597.540406] INFO: Stall ended before state dump start
> [33792.478131] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=494127 jiffies, g=655835, c=655834, q=0)
> [33792.480884] INFO: Stall ended before state dump start
> [33987.418585] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=513632 jiffies, g=655835, c=655834, q=0)
> [33987.421377] INFO: Stall ended before state dump start
> [34182.359039] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=533137 jiffies, g=655835, c=655834, q=0)
> [34182.361850] INFO: Stall ended before state dump start
> [34377.299493] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=552642 jiffies, g=655835, c=655834, q=0)
> [34377.302337] INFO: Stall ended before state dump start
> [34572.239946] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=572147 jiffies, g=655835, c=655834, q=0)
> [34572.242822] INFO: Stall ended before state dump start
> [34767.180400] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=591652 jiffies, g=655835, c=655834, q=0)
> [34767.183313] INFO: Stall ended before state dump start
> [34962.120853] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=611157 jiffies, g=655835, c=655834, q=0)
> [34962.123764] INFO: Stall ended before state dump start
> [35157.061306] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=630662 jiffies, g=655835, c=655834, q=0)
> [35157.064221] INFO: Stall ended before state dump start
> [35352.001759] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=650167 jiffies, g=655835, c=655834, q=0)
> [35352.004664] INFO: Stall ended before state dump start
> [35546.942213] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=669672 jiffies, g=655835, c=655834, q=0)
> [35546.945120] INFO: Stall ended before state dump start
> [35741.882666] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=689177 jiffies, g=655835, c=655834, q=0)
> [35741.885579] INFO: Stall ended before state dump start
> [35936.823119] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=708682 jiffies, g=655835, c=655834, q=0)
> [35936.826030] INFO: Stall ended before state dump start
> [36131.763572] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=728187 jiffies, g=655835, c=655834, q=0)
> [36131.766484] INFO: Stall ended before state dump start
> [36326.704024] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=747692 jiffies, g=655835, c=655834, q=0)
> [36326.706939] INFO: Stall ended before state dump start
> [36521.644477] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=767197 jiffies, g=655835, c=655834, q=0)
> [36521.647383] INFO: Stall ended before state dump start
> [36716.584930] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=786702 jiffies, g=655835, c=655834, q=0)
> [36716.587836] INFO: Stall ended before state dump start
> [36911.525383] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=806207 jiffies, g=655835, c=655834, q=0)
> [36911.528300] INFO: Stall ended before state dump startd
> [37106.465835] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=825712 jiffies, g=655835, c=655834, q=0)
> [37106.468753] INFO: Stall ended before state dump start
> [37301.406288] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=845217 jiffies, g=655835, c=655834, q=0)
> [37301.409196] INFO: Stall ended before state dump start
> [37496.346740] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=864722 jiffies, g=655835, c=655834, q=0)
> [37496.349658] INFO: Stall ended before state dump start
> [37691.287193] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=884227 jiffies, g=655835, c=655834, q=0)
> [37691.290111] INFO: Stall ended before state dump start
> [37886.227645] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=903732 jiffies, g=655835, c=655834, q=0)
> [37886.230560] INFO: Stall ended before state dump start
> [38081.168097] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=923237 jiffies, g=655835, c=655834, q=0)
> [38081.171016] INFO: Stall ended before state dump start
> [38276.108550] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=942742 jiffies, g=655835, c=655834, q=0)
> [38276.111471] INFO: Stall ended before state dump start
> [38471.049002] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=962247 jiffies, g=655835, c=655834, q=0)
> [38471.051911] INFO: Stall ended before state dump start
> [38665.989454] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 0, t=981752 jiffies, g=655835, c=655834, q=0)
> [38665.992372] INFO: Stall ended before state dump start
> [38860.929906] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 1, t=1001257 jiffies, g=655835, c=655834, q=0)
> [38860.932839] INFO: Stall ended before state dump start
> [38946.631742] INFO: rcu_preempt detected stalls on CPUs/tasks: {} (detected by 2, t=6502 jiffies, g=655989, c=655988, q=0)
> [38946.634633] INFO: Stall ended before state dump start
> 

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