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Date: Thu, 21 Sep 2017 11:46:43 +1000 (AEST) From: Michael Ellerman <patch-notifications@...erman.id.au> To: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>, linuxppc-dev@...ts.ozlabs.org Cc: maddy@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org, Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>, paulus@...ba.org, kan.liang@...el.com, tglx@...utronix.de, mingo@...nel.org Subject: Re: powerpc/sysrq: Fix oops whem ppmu is not registered 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@...ux.vnet.ibm.com> > Reviewed-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> Applied to powerpc fixes, thanks. https://git.kernel.org/powerpc/c/4917fcb58cc73f6b81455e3c5f9601 cheers
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