On Tue, 2011-01-25 at 17:54 -0600, kevin diggs wrote: > Hi, > > The cpufreq driver I wrote for the 750gx causes a kernel panic in 2.6.36. > > This is from a screen shot: > > [c6035f30] [c001014c] timer_interrupt+0x13c/0x19c > [c6035f40] [c0013294] ret_from_except+0x0/0x14 > --- Exception: 901 at 0x1000c694 > LR = 0x1000f3e4 > Instruction dump: > 4bffff48 38610008 4be7b2b1 4bffff9c 9421fff0 7c0802a6 bfc10xxx > 90010014 7c0000a6 68008000 54008ffe <0f000000> 3d20c030 2f84xxxx > Kernel panic - not syncing: Fatal exception in interrupt > Call Trace: > [c6035bf0] [c00084e4] show_stack+0x3c/0x160 (unreliable) > [c6035c20] [c002cf44] panic+0xa4/0x1c8 > [c6035c70] [c001085c] die+0x194/0x1a0 > [c6035c90] [c0010aa8] _exception+0xfc/0x108 > [c6035d80] [c0013248] ret_from_except_full+0x0/0x4c > --- Exception: 700 at cpufreq_notify_transition+0x20/0x128 > LR = cf750gx_pll_switch_cb+0x20/0xd0 [cf750gx] > [c6035e40] [c02e2280] 0xc02e2280 (unreliable) > [c6035e50] [ddc4b3dc] cf750gx_pll_switch_cb+0x20/0xd0 [cf750gx] > [c6035e60] [c004d7ac] notifier_call_chain+0x60/0xb0 > [c6035e80] [ddc361c4] pllif_i_switch_PLLs+0xa0/0x140 [pll_if] > [c6035e90] [ddc365fc] pllif_i_timer_f+0x4c/0x6c [pll_if] > [c6035ea0] [c004bb24] __run_hrtimer+0x44/0xb8 > [c6035eb0] [c004c1f8] hrtimer_interrupt+0x10c/0x388 > [c6035f30] [c001014c] timer_interrupt+0x13c/0x19c > [c6035f40] [c0013294] ret_from_except+0x0/0x14 > --- Exception: 901 at 0x1000c694 > LR = 0x1000f3e4 > Rebooting in 180 seconds.._ > > What are exception 700 & 901?
700 is a program check (illegal instruction or BUG_ON() statement) 900 is decrementer (aka timer) interrupt. > The 0x1000c694 address looks fishy? That's userspace. So you took a timer interrupt, which got into hrtimer, and something you did caused cpufreq_notify_transition to crash, probably with a BUG_ON (which you can probably see above what you pasted, unless you don't have access to that part of the backtrace). Cheers, Ben. > Thanks! > > kevin > _______________________________________________ > Linuxppc-dev mailing list > Linuxppc-dev@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/linuxppc-dev _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
