Ingo Molnar <mingo <at> elte.hu> writes:
>
> i have released the v2.6.20-rt1 kernel, which can be downloaded from the
> usual place:
>
> http://redhat.com/~mingo/realtime-preempt/
>
> more info about the -rt patchset can be found in the RT wiki:
>
> http://rt.wiki.kernel.org
>
On FC6 with KVM userspace from trunk I get a ton of errors like this in dmesg -
=======================
---------------------------
| preempt count: 00000001 ]
| 1-level deep critical section nesting:
----------------------------------------
.. [<f90ecc48>] .... vmx_vcpu_load+0x26/0xd2 [kvm_intel]
.....[<f90b0a1c>] .. ( <= vcpu_load+0x38/0x3c [kvm])
BUG: sleeping function called from invalid context qemu(4314) at
arch/i386/mm/highmem.c:8
in_atomic():1 [00000001], irqs_disabled():0
[<c010503c>] dump_trace+0x63/0x1e8
[<c01051dd>] show_trace_log_lvl+0x1c/0x39
[<c01055d4>] show_trace+0x12/0x14
[<c01055ea>] dump_stack+0x14/0x16
[<c0122b71>] __might_sleep+0x110/0x117
[<c012161b>] kmap+0x3e/0x48
[<f90b415e>] paging32_walk_addr+0x214/0x276 [kvm]
[<f90b4f08>] paging32_page_fault+0x51/0x749 [kvm]
[<f90ede01>] handle_exception+0xeb/0x1da [kvm_intel]
[<f90edc8a>] kvm_vmx_return+0x169/0x1f5 [kvm_intel]
[<f90b108a>] kvm_dev_ioctl+0x284/0x1148 [kvm]
[<c0189db9>] do_ioctl+0x21/0x66
[<c018a053>] vfs_ioctl+0x255/0x268
[<c018a0ae>] sys_ioctl+0x48/0x62
[<c0104009>] syscall_call+0x7/0xb
[<009858b2>] 0x9858b2
=======================
---------------------------
| preempt count: 00000001 ]
| 1-level deep critical section nesting:
----------------------------------------
.. [<f90ecc48>] .... vmx_vcpu_load+0x26/0xd2 [kvm_intel]
.....[<f90b0a1c>] .. ( <= vcpu_load+0x38/0x3c [kvm])
BUG: sleeping function called from invalid context qemu(4314) at
arch/i386/mm/highmem.c:8
in_atomic():1 [00000001], irqs_disabled():0
[<c010503c>] dump_trace+0x63/0x1e8
[<c01051dd>] show_trace_log_lvl+0x1c/0x39
[<c01055d4>] show_trace+0x12/0x14
[<c01055ea>] dump_stack+0x14/0x16
[<c0122b71>] __might_sleep+0x110/0x117
[<c012161b>] kmap+0x3e/0x48
[<f90b415e>] paging32_walk_addr+0x214/0x276 [kvm]
[<f90b4f08>] paging32_page_fault+0x51/0x749 [kvm]
[<f90ede01>] handle_exception+0xeb/0x1da [kvm_intel]
[<f90edc8a>] kvm_vmx_return+0x169/0x1f5 [kvm_intel]
[<f90b108a>] kvm_dev_ioctl+0x284/0x1148 [kvm]
[<c0189db9>] do_ioctl+0x21/0x66
[<c018a053>] vfs_ioctl+0x255/0x268
[<c018a0ae>] sys_ioctl+0x48/0x62
[<c0104009>] syscall_call+0x7/0xb
[<009858b2>] 0x9858b2
=======================
---------------------------
| preempt count: 00000001 ]
| 1-level deep critical section nesting:
----------------------------------------
.. [<f90ecc48>] .... vmx_vcpu_load+0x26/0xd2 [kvm_intel]
.....[<f90b0a1c>] .. ( <= vcpu_load+0x38/0x3c [kvm])
-
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