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Re: qemu sparc64 runtime crashes in -next

From David Miller <davem@davemloft.net>
Newsgroups linux.kernel
Subject Re: qemu sparc64 runtime crashes in -next
Date 2017-06-14 21:40 +0200
Message-ID <tSmj0-Qa-9@gated-at.bofh.it> (permalink)
References <tSdz4-3TR-13@gated-at.bofh.it>
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From: Guenter Roeck <linux@roeck-us.net>
Date: Wed, 14 Jun 2017 03:13:54 -0700

> Hi,
> 
> my sparc qemu tests started failing with next-20170613.
> Log output is not very helpful:
> 
> Unhandled Exception 0x0000000000000028
> PC = 0x00000000004620f4 NPC = 0x00000000004620f8
> Stopping execution
> 
> It looks like 0x00000000004620f4 is in init_tick_ops().
> 
> Bisect points to commit 'sparc64: improve modularity tick options'.
> Bisect log is attached.
> 
> No idea if this is a qemu problem. If you think it is, anything to
> help
> tracking it down would be appreciated.

Pavel, please look into this.

It looks weird that the commit it bisects to would cause a problem.
Maybe the change from __read_mostly to __cachelin_aligned causes the
issue?

Really weird...

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Thread

qemu sparc64 runtime crashes in -next Guenter Roeck <linux@roeck-us.net> - 2017-06-14 12:20 +0200
  Re: qemu sparc64 runtime crashes in -next David Miller <davem@davemloft.net> - 2017-06-14 21:40 +0200
    Re: qemu sparc64 runtime crashes in -next Guenter Roeck <linux@roeck-us.net> - 2017-06-14 22:50 +0200
      Re: qemu sparc64 runtime crashes in -next Pasha Tatashin <pasha.tatashin@oracle.com> - 2017-06-14 23:00 +0200

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