From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org
Cc: maddy@linux.vnet.ibm.com, linux-kernel@vger.kernel.org,
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>,
paulus@samba.org, kan.liang@intel.com, tglx@linutronix.de,
mingo@kernel.org
Subject: Re: powerpc/sysrq: Fix oops whem ppmu is not registered
Date: Thu, 21 Sep 2017 11:46:43 +1000 (AEST) [thread overview]
Message-ID: <3xyKGX1f9lz9sRV@ozlabs.org> (raw)
In-Reply-To: <1505801826-12396-1-git-send-email-ravi.bangoria@linux.vnet.ibm.com>
On Tue, 2017-09-19 at 06:17:06 UTC, Ravi Bangoria wrote:
> Kernel crashes if power pmu is not registered and user tries to dump
> regs with 'echo p > /proc/sysrq-trigger'. Sample log:
>
> Unable to handle kernel paging request for data at address 0x00000008
> Faulting instruction address: 0xc0000000000d52f0
>
> NIP [c0000000000d52f0] perf_event_print_debug+0x10/0x230
> LR [c00000000058a938] sysrq_handle_showregs+0x38/0x50
> Call Trace:
> printk+0x38/0x4c (unreliable)
> __handle_sysrq+0xe4/0x270
> write_sysrq_trigger+0x64/0x80
> proc_reg_write+0x80/0xd0
> __vfs_write+0x40/0x200
> vfs_write+0xc8/0x240
> SyS_write+0x60/0x110
> system_call+0x58/0x6c
>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
> Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Applied to powerpc fixes, thanks.
https://git.kernel.org/powerpc/c/4917fcb58cc73f6b81455e3c5f9601
cheers
prev parent reply other threads:[~2017-09-21 1:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-19 6:17 [PATCH] " Ravi Bangoria
2017-09-19 10:00 ` Michael Ellerman
2017-09-19 10:04 ` Madhavan Srinivasan
2017-09-21 1:46 ` Michael Ellerman [this message]
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