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SubjectRe: rcu: INFO: rcu_preempt detected stalls on CPUs/tasks on v3.6
On 07/25/2012 01:10 AM, Sasha Levin wrote:
> Hi all,
>
> I was fuzzing with trinity inside a KVM tools guest, on the current 3.6, and stumbled on the following:

And is this a host dmesg or from the guest?
Could you please provide more details about your testing environment?

Thanks,
Michael Wang

>
> (Note that it also happens on -next).
>
> [ 215.034674] INFO: rcu_preempt detected stalls on CPUs/tasks:
> [ 215.035641] 1: (0 ticks this GP) idle=3f5/140000000000001/0 drain=0 . timer=18446744073709551615
> [ 215.035641] (detected by 3, t=111886 jiffies)
> [ 215.035641] sending NMI to all CPUs:
> [ 214.959504] NMI backtrace for cpu 2
> [ 214.959504] CPU 2
> [ 214.959504] Pid: 6583, comm: trinity-child6 Tainted: G W 3.5.0-sasha-01644-g824681b #267
> [ 214.959504] RIP: 0010:[<ffffffff81149aa3>] [<ffffffff81149aa3>] check_flags+0x93/0x1d0
> [ 214.959504] RSP: 0018:ffff880025175b58 EFLAGS: 00000046
> [ 214.959504] RAX: ffff880027910000 RBX: ffff880027910000 RCX: 0000000000000000
> [ 214.959504] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
> [ 214.959504] RBP: ffff880025175b58 R08: 0000000000000000 R09: 0000000000000000
> [ 214.959504] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
> [ 214.959504] R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
> [ 214.959504] FS: 00007f754d198700(0000) GS:ffff880029800000(0000) knlGS:0000000000000000
> [ 214.959504] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 214.959504] CR2: 0000000000000008 CR3: 00000000251aa000 CR4: 00000000000406e0
> [ 214.959504] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 214.959504] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 214.959504] Process trinity-child6 (pid: 6583, threadinfo ffff880025174000, task ffff880027910000)
> [ 214.959504] Stack:
> [ 214.959504] ffff880025175be8 ffffffff8114e610 ffff880027910000 0000000000000000
> [ 214.959504] 0000000000000286 ffffffffffffff10 ffffffff8114e51d 0000000000000010
> [ 214.959504] 0000000000000286 0000000025175bb8 ffff880019a767c8 0000000000000286
> [ 214.959504] Call Trace:
> [ 214.959504] [<ffffffff8114e610>] lock_acquire+0x80/0x270
> [ 214.959504] [<ffffffff8114e51d>] ? lock_release+0x1ad/0x220
> [ 214.959504] [<ffffffff83699dcb>] _raw_spin_lock+0x3b/0x70
> [ 214.959504] [<ffffffff8124a055>] ? __d_lookup+0x145/0x2e0
> [ 214.959504] [<ffffffff8124a055>] __d_lookup+0x145/0x2e0
> [ 214.959504] [<ffffffff8123d216>] lookup_fast+0x136/0x240
> [ 214.959504] [<ffffffff8123be8b>] ? __inode_permission+0xbb/0xd0
> [ 214.959504] [<ffffffff8123bea9>] ? inode_permission+0x9/0x50
> [ 214.959504] [<ffffffff8123da1c>] link_path_walk+0x22c/0x8f0
> [ 214.959504] [<ffffffff8123cc43>] ? path_init+0x213/0x550
> [ 214.959504] [<ffffffff81976e38>] ? __raw_spin_lock_init+0x38/0x70
> [ 214.959504] [<ffffffff8123faa8>] path_openat+0x98/0x400
> [ 214.959504] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 214.959504] [<ffffffff8123fe4d>] do_filp_open+0x3d/0xa0
> [ 214.959504] [<ffffffff819770c8>] ? do_raw_spin_unlock+0xc8/0xe0
> [ 214.959504] [<ffffffff8124f703>] ? alloc_fd+0x1d3/0x1f0
> [ 214.959504] [<ffffffff8124f531>] ? alloc_fd+0x1/0x1f0
> [ 214.959504] [<ffffffff8122f125>] do_sys_open+0x115/0x1b0
> [ 214.959504] [<ffffffff8122f1dc>] sys_open+0x1c/0x20
> [ 214.959504] [<ffffffff8369b77d>] system_call_fastpath+0x1a/0x1f
> [ 214.959504] Code: a4 26 84 e8 70 e2 f8 ff e9 25 01 00 00 0f 1f 00 44 8b 05 61 1c 1e 04 45 85 c0 75 4c 65 48 8b 04 25 00 da 00 00 8b b8 b0 08 00 00 <85> ff 75 39 e8 64 b4 81 00 85 c0 0f 84 09 01 00 00 83 3d 45 bf
> [ 215.026612] NMI backtrace for cpu 1
> [ 215.026612] CPU 1
> [ 215.026612] Pid: 2395, comm: pageattr-test Tainted: G W 3.5.0-sasha-01644-g824681b #267
> [ 215.026612] RIP: 0010:[<ffffffff8109bd5a>] [<ffffffff8109bd5a>] native_write_msr_safe+0xa/0x10
> [ 215.026612] RSP: 0018:ffff88001b803f70 EFLAGS: 00000046
> [ 215.026612] RAX: 0000000000000000 RBX: 000000000000ef80 RCX: 000000000000080b
> [ 215.026612] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000080b
> [ 215.026612] RBP: ffff88001b803f70 R08: 00003ffffffff000 R09: ffff880000000000
> [ 215.026612] R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
> [ 215.026612] R13: ffff880007a98000 R14: ffff88001fc3a4b8 R15: ffff880000000000
> [ 215.026612] FS: 0000000000000000(0000) GS:ffff88001b800000(0000) knlGS:0000000000000000
> [ 215.026612] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 215.026612] CR2: 000000000000000c CR3: 0000000019dcf000 CR4: 00000000000406e0
> [ 215.026612] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 215.026612] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 215.026612] Process pageattr-test (pid: 2395, threadinfo ffff88000ced0000, task ffff88000d773000)
> [ 215.026612] Stack:
> [ 215.026612] ffff88001b803f88 ffffffff81095d07 000000000000ef80 ffff88001b803fa8
> [ 215.026612] ffffffff810901c4 ffff88000ced1db0 0000000000007a98 ffff88000ced1d00
> [ 215.026612] ffffffff8369c4af ffff88000ced1c78 <EOI> ffff88000ced1d00 ffffffff8369aeb4
> [ 215.026612] Call Trace:
> [ 215.026612] <IRQ>
> [ 215.026612] [<ffffffff81095d07>] native_apic_msr_eoi_write+0x27/0x30
> [ 215.026612] [<ffffffff810901c4>] smp_apic_timer_interrupt+0x34/0xa0
> [ 215.026612] [<ffffffff8369c4af>] apic_timer_interrupt+0x6f/0x80
> [ 215.026612] <EOI>
> [ 215.026612] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 215.026612] [<ffffffff810a2cb2>] ? lookup_address+0x112/0x170
> [ 215.026612] [<ffffffff810a32ae>] print_split+0x7e/0x200
> [ 215.026612] [<ffffffff810a4300>] pageattr_test+0x80/0x4a0
> [ 215.026612] [<ffffffff8114a2f8>] ? trace_hardirqs_on_caller+0x118/0x140
> [ 215.026612] [<ffffffff83696cbe>] ? schedule_timeout+0x2ce/0x370
> [ 215.026612] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 215.026612] [<ffffffff810a4720>] ? pageattr_test+0x4a0/0x4a0
> [ 215.026612] [<ffffffff810a473f>] do_pageattr_test+0x1f/0x50
> [ 215.026612] [<ffffffff8110607d>] kthread+0xad/0xc0
> [ 215.026612] [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
> [ 215.026612] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 215.026612] [<ffffffff81105fd0>] ? kthread_flush_work_fn+0x10/0x10
> [ 215.026612] [<ffffffff8369cdb0>] ? gs_change+0x13/0x13
> [ 215.026612] Code: 00 55 89 f9 48 89 e5 0f 32 45 31 c0 89 c7 48 89 d0 44 89 06 48 c1 e0 20 89 f9 5d 48 09 c8 c3 66 90 55 89 f0 89 f9 48 89 e5 0f 30 <31> c0 5d c3 66 90 55 89 f9 48 89 e5 0f 33 89 c7 48 89 d0 5d 48
> [ 215.035641] NMI backtrace for cpu 3
> [ 215.035641] CPU 3
> [ 215.035641] Pid: 0, comm: swapper/3 Tainted: G W 3.5.0-sasha-01644-g824681b #267
> [ 215.035641] RIP: 0010:[<ffffffff8109bd5a>] [<ffffffff8109bd5a>] native_write_msr_safe+0xa/0x10
> [ 215.035641] RSP: 0018:ffff88000d5b5ce8 EFLAGS: 00000086
> [ 215.035641] RAX: 0000000000000400 RBX: 0000000000000003 RCX: 0000000000000830
> [ 215.035641] RDX: 0000000000000003 RSI: 0000000000000400 RDI: 0000000000000830
> [ 215.035641] RBP: ffff88000d5b5ce8 R08: ffffffff84edc9c0 R09: 0000000000000000
> [ 215.035641] R10: 000000000000739d R11: 0000000000025370 R12: ffffffff84edc9c0
> [ 215.035641] R13: 0000000000000003 R14: 000000000000f042 R15: 0000000000000002
> [ 215.035641] FS: 0000000000000000(0000) GS:ffff880035a00000(0000) knlGS:0000000000000000
> [ 215.035641] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 215.035641] CR2: 0000000000bc5958 CR3: 00000000278b0000 CR4: 00000000000406e0
> [ 215.035641] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 215.035641] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 215.035641] Process swapper/3 (pid: 0, threadinfo ffff88000d5b4000, task ffff88000d5b8000)
> [ 215.035641] Stack:
> [ 215.035641] ffff88000d5b5d48 ffffffff81095e0d ffff88000d5b5d58 0000000000000086
> [ 215.035641] 0000000000000002 0008000000000008 ffff88000d5b5d68 0000000000002710
> [ 215.035641] 000000000001b50e 0000000000000001 ffffffff84966008 0000000000000086
> [ 215.035641] Call Trace:
> [ 215.035641] [<ffffffff81095e0d>] __x2apic_send_IPI_mask+0xcd/0x190
> [ 215.035641] [<ffffffff81095ee7>] x2apic_send_IPI_all+0x17/0x20
> [ 215.035641] [<ffffffff810918c3>] arch_trigger_all_cpu_backtrace+0x63/0xa0
> [ 215.035641] [<ffffffff81194513>] print_other_cpu_stall+0x223/0x290
> [ 215.035641] [<ffffffff81194600>] __rcu_pending+0x80/0x200
> [ 215.035641] [<ffffffff8110e1d8>] ? __atomic_notifier_call_chain+0xe8/0x120
> [ 215.035641] [<ffffffff811947bf>] rcu_pending+0x3f/0x70
> [ 215.035641] [<ffffffff811949c4>] rcu_prepare_for_idle+0x1d4/0x430
> [ 215.035641] [<ffffffff81194e6c>] rcu_idle_enter_common+0x24c/0x400
> [ 215.035641] [<ffffffff8110e1f5>] ? __atomic_notifier_call_chain+0x105/0x120
> [ 215.035641] [<ffffffff8110e0f0>] ? atomic_notifier_chain_unregister+0x90/0x90
> [ 215.035641] [<ffffffff8119530b>] rcu_idle_enter+0xdb/0x130
> [ 215.035641] [<ffffffff81074636>] cpu_idle+0x106/0x160
> [ 215.035641] [<ffffffff835d1bb0>] start_secondary+0xd0/0xd7
> [ 215.035641] Code: 00 55 89 f9 48 89 e5 0f 32 45 31 c0 89 c7 48 89 d0 44 89 06 48 c1 e0 20 89 f9 5d 48 09 c8 c3 66 90 55 89 f0 89 f9 48 89 e5 0f 30 <31> c0 5d c3 66 90 55 89 f9 48 89 e5 0f 33 89 c7 48 89 d0 5d 48
> [ 214.997077] NMI backtrace for cpu 0
> [ 214.997077] CPU 0
> [ 214.997077] Pid: 2277, comm: kworker/0:2 Tainted: G W 3.5.0-sasha-01644-g824681b #267
> [ 214.997077] RIP: 0010:[<ffffffff8109bd5a>] [<ffffffff8109bd5a>] native_write_msr_safe+0xa/0x10
> [ 214.997077] RSP: 0018:ffff88000d803f70 EFLAGS: 00000046
> [ 214.997077] RAX: 0000000000000000 RBX: 000000000000ef80 RCX: 000000000000080b
> [ 214.997077] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000080b
> [ 214.997077] RBP: ffff88000d803f70 R08: 0000000000000000 R09: 0000000000000000
> [ 214.997077] R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
> [ 214.997077] R13: ffffffff84854840 R14: 0000000000000286 R15: 00000000000493e0
> [ 214.997077] FS: 0000000000000000(0000) GS:ffff88000d800000(0000) knlGS:0000000000000000
> [ 214.997077] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> [ 214.997077] CR2: 0000000000000000 CR3: 0000000012f58000 CR4: 00000000000406f0
> [ 214.997077] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> [ 214.997077] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> [ 214.997077] Process kworker/0:2 (pid: 2277, threadinfo ffff88000d782000, task ffff88000d653000)
> [ 214.997077] Stack:
> [ 214.997077] ffff88000d803f88 ffffffff81095d07 000000000000ef80 ffff88000d803fa8
> [ 214.997077] ffffffff810901c4 0000000000000002 ffff88000d653000 ffff88000d783cf0
> [ 214.997077] ffffffff8369c4af ffff88000d783c48 <EOI> ffff88000d783cf0 ffffffff8369aeb4
> [ 214.997077] Call Trace:
> [ 214.997077] <IRQ>
> [ 214.997077] [<ffffffff81095d07>] native_apic_msr_eoi_write+0x27/0x30
> [ 214.997077] [<ffffffff810901c4>] smp_apic_timer_interrupt+0x34/0xa0
> [ 214.997077] [<ffffffff8369c4af>] apic_timer_interrupt+0x6f/0x80
> [ 214.997077] <EOI>
> [ 214.997077] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 214.997077] [<ffffffff8114b46d>] ? lock_is_held+0xed/0x110
> [ 214.997077] [<ffffffff8313ed87>] rt_check_expire+0x117/0x300
> [ 214.997077] [<ffffffff8313ef79>] rt_worker_func+0x9/0x20
> [ 214.997077] [<ffffffff810fa936>] process_one_work+0x376/0x700
> [ 214.997077] [<ffffffff810fa7f0>] ? process_one_work+0x230/0x700
> [ 214.997077] [<ffffffff8313ef70>] ? rt_check_expire+0x300/0x300
> [ 214.997077] [<ffffffff810fb508>] ? worker_thread+0x48/0x320
> [ 214.997077] [<ffffffff810fb69c>] worker_thread+0x1dc/0x320
> [ 214.997077] [<ffffffff810fb4c0>] ? manage_workers.isra.11+0x120/0x120
> [ 214.997077] [<ffffffff8110607d>] kthread+0xad/0xc0
> [ 214.997077] [<ffffffff8369cdb4>] kernel_thread_helper+0x4/0x10
> [ 214.997077] [<ffffffff8369aeb4>] ? retint_restore_args+0x13/0x13
> [ 214.997077] [<ffffffff81105fd0>] ? kthread_flush_work_fn+0x10/0x10
> [ 214.997077] [<ffffffff8369cdb0>] ? gs_change+0x13/0x13
> [ 214.997077] Code: 00 55 89 f9 48 89 e5 0f 32 45 31 c0 89 c7 48 89 d0 44 89 06 48 c1 e0 20 89 f9 5d 48 09 c8 c3 66 90 55 89 f0 89 f9 48 89 e5 0f 30 <31> c0 5d c3 66 90 55 89 f9 48 89 e5 0f 33 89 c7 48 89 d0 5d 48
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