Andrea Righi <andrea.ri...@canonical.com> writes:
> I'm triggering the following bug when booting my qemu powerpc VM:
I'm not seeing that here :/
Can you give a bit more detail?
- qemu version
- qemu command line
- what userspace are you using?
- full dmesg of the failing case
> event-sources: Unable to request interrupt 23 for
> /event-sources/hot-plug-events
> WARNING: CPU: 0 PID: 1 at arch/powerpc/platforms/pseries/event_sources.c:26
> request_event_sources_irqs+0xbc/0xf0
> Modules linked in:
> CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.2.2-kc #1
> Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1200 0xf000005
> of:SLOF,HEAD pSeries
> NIP: c000000002022eec LR: c000000002022ee8 CTR: 0000000000000000
> REGS: c000000003483910 TRAP: 0700 Tainted: G W (6.2.2-kc)
> MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24483200 XER: 00000000
> CFAR: c000000000180838 IRQMASK: 0
> GPR00: c000000002022ee8 c000000003483bb0 c000000001a5ce00 0000000000000050
> GPR04: c000000002437d78 c000000002437e28 0000000000000001 0000000000000001
> GPR08: c000000002437d00 0000000000000001 0000000000000000 0000000044483200
> GPR12: 0000000000000000 c000000002720000 c000000000012758 0000000000000000
> GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> GPR24: 0000000000000000 c0000000020033fc cccccccccccccccd c0000000000e07f0
> GPR28: c000000000db0520 0000000000000000 c0000000fff92ac0 0000000000000017
> NIP [c000000002022eec] request_event_sources_irqs+0xbc/0xf0
> LR [c000000002022ee8] request_event_sources_irqs+0xb8/0xf0
> Call Trace:
> [c000000003483bb0] [c000000002022ee8] request_event_sources_irqs+0xb8/0xf0
> (unreliable)
> [c000000003483c40] [c000000002022fa0]
> __machine_initcall_pseries_init_ras_hotplug_IRQ+0x80/0xb0
> [c000000003483c70] [c0000000000121b8] do_one_initcall+0x98/0x300
> [c000000003483d50] [c000000002004b28] kernel_init_freeable+0x2ec/0x370
> [c000000003483df0] [c000000000012780] kernel_init+0x30/0x190
> [c000000003483e50] [c00000000000cf5c] ret_from_kernel_thread+0x5c/0x64
> --- interrupt: 0 at 0x0
>
> I did a bisect it and it seems that the offending commit is:
> baa49d81a94b ("powerpc/pseries: hvcall stack frame overhead")
>
> Reverting that and also dfecd06bc552 ("powerpc: remove
> STACK_FRAME_OVERHEAD"), because we need to re-introduce
> STACK_FRAME_OVERHEAD, seems to fix everything.
That function doesn't make a hcall, so presumably there was some earlier
problem which we only detect here.
cheers
