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* Ingo Molnar <mingo@elte.hu> wrote: > i think what happened is that the pagefault happened with irqs > disabled, and the entry.S return-to-exception-site irq-flags tracing > code mistakenly turned on the irq flag - causing the mismatch and > lockdep's confusion. here's the fix for the irqs-off iret irqflags-tracing problem. Does this fix the bug(s) on your box? Ingo Index: linux/arch/i386/kernel/entry.S =================================================================== --- linux.orig/arch/i386/kernel/entry.S +++ linux/arch/i386/kernel/entry.S @@ -364,6 +364,8 @@ restore_all: CFI_REMEMBER_STATE je ldt_ss # returning to user-space with LDT SS restore_nocheck: + testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception path) ? + jz restore_nocheck_notrace TRACE_IRQS_ON restore_nocheck_notrace: RESTORE_REGS @@ -404,7 +406,10 @@ ldt_ss: * and a switch16 pointer on top of the current frame. */ call setup_x86_bogus_stack CFI_ADJUST_CFA_OFFSET -8 # frame has moved + testl $IF_MASK,EFLAGS(%esp) # interrupts off (exception path) ? + jz restore_nocheck_notrace2 TRACE_IRQS_ON +restore_nocheck_notrace2: RESTORE_REGS lss 20+4(%esp), %esp # switch to 16bit stack 1: iret - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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