[parisc-linux] [BUG] SysRQ H kills the machine

[Joel Soete]

> On Mon, 2006-07-24 at 00:01 -0400, Thibaut VARENE wrote:
> > Hi pa-ckers
> > 
> > quick brain dump before going to bed:
> > 2.6.18-rc1-pa3
> > boot init=/bin/sh -- machine is alive
> > issue a sysrq h (help) -- machine is dead
> > 
> > happened to me on parisc and probably ia64 (have to double check the latter).
> 
> This is a known and incredibly annoying bug:  serial console is broken
> for sysrq.  Alan Cox is currently trying to fix it, I believe.
> 
> James
> 
I also read this report: <http://lkml.org/lkml/2006/7/17/40>

similar to the baktrace in this:
Jul 17 09:23:03 [kernel] BUG: soft lockup detected on CPU#1!
Jul 17 09:23:03 [kernel]  [<c0103cd2>] show_trace+0x12/0x20
Jul 17 09:23:03 [kernel]  [<c0103de9>] dump_stack+0x19/0x20
Jul 17 09:23:03 [kernel]  [<c0143e77>] softlockup_tick+0xa7/0xd0
Jul 17 09:23:03 [kernel]  [<c0129422>] run_local_timers+0x12/0x20
Jul 17 09:23:03 [kernel]  [<c012923e>] update_process_times+0x6e/0xa0
--- snip ---

even thought the author mentioned: "...I got the following reported via dmesg:".

So imho is system did hang?

Could it be also related to this same 'serial console' pb you spoke above?

Thanks,
    Joel


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