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Subjecthrtimer: Lockups with latest -next kernel
Hi all,

While fuzzing with trinity inside a KVM tools guest on the latest -next kernel, I've started seeing
hangs straight away after the guest has started fuzzing.

I've annotated the hang spots with [HANG]. When those happen everything is pretty much locked up.


[ 39.030023] hrtimer: interrupt took 3064 ns
[ 39.030025] hrtimer: interrupt took 2769 ns

[HANG]

[ 78.052011] ------------[ cut here ]------------
[ 78.052012] ------------[ cut here ]------------
[ 78.052038] WARNING: at kernel/time/clockevents.c:209 clockevents_program_event+0x48/0xf0()
[ 78.052041] Pid: 0, comm: swapper/2 Tainted: G W 3.5.0-rc7-next-20120720-sasha-00001-g0bb3f48-dirty #227
[ 78.052041] Call Trace:
[ 78.052058] <IRQ> [<ffffffff811554b8>] ? clockevents_program_event+0x48/0xf0
[ 78.052082] [<ffffffff810e93d7>] warn_slowpath_common+0x87/0xb0
[ 78.052086] [<ffffffff810e94c5>] warn_slowpath_null+0x15/0x20
[ 78.052086] [<ffffffff811554b8>] clockevents_program_event+0x48/0xf0
[ 78.052103] [<ffffffff8115717f>] tick_program_event+0x1f/0x30
[ 78.052121] [<ffffffff8111e62a>] hrtimer_interrupt+0x1ea/0x220
[ 78.052132] [<ffffffff81092035>] smp_apic_timer_interrupt+0x85/0xa0
[ 78.052132] [<ffffffff8378c82f>] apic_timer_interrupt+0x6f/0x80
[ 78.052150] <EOI> [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 78.052169] [<ffffffff8109e036>] ? native_safe_halt+0x6/0x10
[ 78.052179] [<ffffffff8115d78d>] ? trace_hardirqs_on+0xd/0x10
[ 78.052179] [<ffffffff81074a65>] default_idle+0x235/0x5c0
[ 78.052196] [<ffffffff81076648>] cpu_idle+0x118/0x160
[ 78.052212] [<ffffffff836c100e>] start_secondary+0xd0/0xd7
[ 78.052218] ---[ end trace 2b1961b84676e158 ]---
[ 78.061989] WARNING: at kernel/time/clockevents.c:209 clockevents_program_event+0x48/0xf0()
[ 78.061989] Pid: 0, comm: swapper/3 Tainted: G W 3.5.0-rc7-next-20120720-sasha-00001-g0bb3f48-dirty #227
[ 78.061989] Call Trace:
[ 78.061989] <IRQ> [<ffffffff811554b8>] ? clockevents_program_event+0x48/0xf0
[ 78.061989] [<ffffffff810e93d7>] warn_slowpath_common+0x87/0xb0
[ 78.061989] [<ffffffff810e94c5>] warn_slowpath_null+0x15/0x20
[ 78.061989] [<ffffffff811554b8>] clockevents_program_event+0x48/0xf0
[ 78.061989] [<ffffffff8115717f>] tick_program_event+0x1f/0x30
[ 78.061989] [<ffffffff8111e62a>] hrtimer_interrupt+0x1ea/0x220
[ 78.061989] [<ffffffff81092035>] smp_apic_timer_interrupt+0x85/0xa0
[ 78.061989] [<ffffffff8378c82f>] apic_timer_interrupt+0x6f/0x80
[ 78.061989] <EOI> [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 78.061989] [<ffffffff8109e036>] ? native_safe_halt+0x6/0x10
[ 78.061989] [<ffffffff8115d78d>] ? trace_hardirqs_on+0xd/0x10
[ 78.061989] [<ffffffff81074a65>] default_idle+0x235/0x5c0
[ 78.061989] [<ffffffff81076648>] cpu_idle+0x118/0x160
[ 78.061989] [<ffffffff836c100e>] start_secondary+0xd0/0xd7
[ 78.061989] ---[ end trace 2b1961b84676e159 ]---

[HANG]

[ 234.121718] BUG: soft lockup - CPU#0 stuck for 34s! [trinity-child41:6057]
[ 234.121718] irq event stamp: 31065397
[ 234.121718] hardirqs last enabled at (31065396): [<ffffffff8378b234>] restore_args+0x0/0x30
[ 234.121718] hardirqs last disabled at (31065397): [<ffffffff8378c82a>] apic_timer_interrupt+0x6a/0x80
[ 234.121718] softirqs last enabled at (344302): [<ffffffff8311a114>] release_sock+0x94/0xa0
[ 234.121718] softirqs last disabled at (7204061): [<ffffffff8378d22c>] call_softirq+0x1c/0x30
[ 234.121718] CPU 0
[ 234.121718] Pid: 6057, comm: trinity-child41 Tainted: G W 3.5.0-rc7-next-20120720-sasha-00001-g0bb3f48-dirty #227
[ 234.121718] RIP: 0010:[<ffffffff810f3604>] [<ffffffff810f3604>] __do_softirq+0x94/0x450
[ 234.121718] RSP: 0018:ffff88000d803ec0 EFLAGS: 00000282
[ 234.121718] RAX: 0000000000000086 RBX: ffffffff8378b234 RCX: 0000000000000000
[ 234.121718] RDX: ffff88000bad0000 RSI: 0000000000000000 RDI: ffff88000bad0000
[ 234.121718] RBP: ffff88000d803f30 R08: 0000000000000000 R09: 0000000000000000
[ 234.121718] R10: 0000000000000001 R11: 0000000000000000 R12: ffff88000d803e38
[ 234.121718] R13: ffffffff8378c82f R14: ffff88000d803f30 R15: 0000000000000282
[ 234.121718] FS: 00007f8ca2ccb700(0000) GS:ffff88000d800000(0000) knlGS:0000000000000000
[ 234.121718] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 234.121718] CR2: 0000000000000000 CR3: 000000000bab3000 CR4: 00000000000406f0
[ 234.121718] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 234.121718] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 234.121718] Process trinity-child41 (pid: 6057, threadinfo ffff88000baca000, task ffff88000bad0000)
[ 234.121718] Stack:
[ 234.121718] ffff88000d9d7640 ffff88000bacbfd8 ffff88000bacbfd8 ffff88000000000a
[ 234.121718] ffff88000bacbfd8 000000000d803f18 ffff88000bacbfd8 0000000000005678
[ 234.121718] 0000000000000000 0000000000000086 ffff88000bacbfd8 0000000000000001
[ 234.121718] Call Trace:
[ 234.121718] <IRQ>
[ 234.121718] [<ffffffff8378d22c>] call_softirq+0x1c/0x30
[ 234.121718] [<ffffffff8106d41d>] do_softirq+0x7d/0x100
[ 234.121718] [<ffffffff810f3cec>] irq_exit+0x5c/0xd0
[ 234.121718] [<ffffffff8109203a>] smp_apic_timer_interrupt+0x8a/0xa0
[ 234.121718] [<ffffffff8378c82f>] apic_timer_interrupt+0x6f/0x80
[ 234.121718] <EOI>
[ 234.121718] [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 234.121718] [<ffffffff8378a3ed>] ? _raw_spin_unlock_irqrestore+0x6d/0xa0
[ 234.121718] [<ffffffff8111e012>] hrtimer_try_to_cancel+0x182/0x1f0
[ 234.121718] [<ffffffff8111e098>] hrtimer_cancel+0x18/0x30
[ 234.121718] [<ffffffff83787e54>] do_nanosleep+0x84/0xd0
[ 234.121718] [<ffffffff8111ea47>] hrtimer_nanosleep+0xd7/0x180
[ 234.121718] [<ffffffff8111cce0>] ? update_rmtp+0x70/0x70
[ 234.121718] [<ffffffff81116a1e>] common_nsleep+0x1e/0x20
[ 234.121718] [<ffffffff8111805c>] sys_clock_nanosleep+0xcc/0x110
[ 234.121718] [<ffffffff8378bafd>] system_call_fastpath+0x1a/0x1f
[ 234.121718] Code: 1f 84 00 00 00 00 00 65 c7 04 25 c0 46 1d 00 00 00 00 00 e8 8f a1 06 00 48 83 3d df 70 75 03 00 75 05 0f 0b 0f 1f 00 fb 66 66 90 <66> 66 90 48 c7 c3 00 60 80 84 66 90 41 f6 c4 01 0f 84 76 02 00
[ 234.121718] Kernel panic - not syncing: softlockup: hung tasks
[ 234.121718] Pid: 6057, comm: trinity-child41 Tainted: G W 3.5.0-rc7-next-20120720-sasha-00001-g0bb3f48-dirty #227
[ 234.121718] Call Trace:
[ 234.121718] <IRQ> [<ffffffff836cf8e2>] panic+0xcd/0x1f4
[ 234.121718] [<ffffffff810f3618>] ? __do_softirq+0xa8/0x450
[ 234.121718] [<ffffffff81195b5e>] watchdog_timer_fn+0x15e/0x190
[ 234.121718] [<ffffffff8111d51e>] __run_hrtimer+0x27e/0x4d0
[ 234.121718] [<ffffffff8109dda9>] ? kvm_clock_get_cycles+0x9/0x10
[ 234.121718] [<ffffffff81195a00>] ? __touch_watchdog+0x20/0x20
[ 234.121718] [<ffffffff811508cc>] ? ktime_get_update_offsets+0x4c/0xd0
[ 234.121718] [<ffffffff8111e559>] hrtimer_interrupt+0x119/0x220
[ 234.121718] [<ffffffff81092035>] smp_apic_timer_interrupt+0x85/0xa0
[ 234.121718] [<ffffffff8378c82f>] apic_timer_interrupt+0x6f/0x80
[ 234.121718] [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 234.121718] [<ffffffff810f3604>] ? __do_softirq+0x94/0x450
[ 234.121718] [<ffffffff8378d22c>] call_softirq+0x1c/0x30
[ 234.121718] [<ffffffff8106d41d>] do_softirq+0x7d/0x100
[ 234.121718] [<ffffffff810f3cec>] irq_exit+0x5c/0xd0
[ 234.121718] [<ffffffff8109203a>] smp_apic_timer_interrupt+0x8a/0xa0
[ 234.121718] [<ffffffff8378c82f>] apic_timer_interrupt+0x6f/0x80
[ 234.121718] <EOI> [<ffffffff8378b234>] ? retint_restore_args+0x13/0x13
[ 234.121718] [<ffffffff8378a3ed>] ? _raw_spin_unlock_irqrestore+0x6d/0xa0
[ 234.121718] [<ffffffff8111e012>] hrtimer_try_to_cancel+0x182/0x1f0
[ 234.121718] [<ffffffff8111e098>] hrtimer_cancel+0x18/0x30
[ 234.121718] [<ffffffff83787e54>] do_nanosleep+0x84/0xd0
[ 234.121718] [<ffffffff8111ea47>] hrtimer_nanosleep+0xd7/0x180
[ 234.121718] [<ffffffff8111cce0>] ? update_rmtp+0x70/0x70
[ 234.121718] [<ffffffff81116a1e>] common_nsleep+0x1e/0x20
[ 234.121718] [<ffffffff8111805c>] sys_clock_nanosleep+0xcc/0x110
[ 234.121718] [<ffffffff8378bafd>] system_call_fastpath+0x1a/0x1f


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