kernel BUG in preempt_schedule_irq at kernel/sched.c:3114!
Hi all,
My system is a PPC running kernel 2.6.14.7 . My application uses interrupts to collect bytes from the uart . And I have to uarts running in parallel which signal to the same interrupt line . When I run only one uart at a time the system works fine . But when the 2 run symultaniously the system crashes as follows : " kernel BUG in preempt_schedule_irq at kernel/sched.c:3114! Oops: Exception in kernel mode, sig: 5 [#1] PREEMPT NIP: C02297A8 LR: C0004A40 SP: C0286170 REGS: c02860c0 TRAP: 0700 Tainted: P MSR: 00029032 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c0265b00[0] 'swapper' THREAD: c0286000 Last syscall: 120 GPR00: 00000001 C0286170 C0265B00 00009032 00000000 00003032 00600084 C02B5594 GPR08: C0280000 C0286000 00000001 C026A200 512037AD 4377FFBF 0FFFD000 00000000 GPR16: 00000001 00000001 FFFFFFFF 007FFF00 0FFF7E68 00000000 00000002 0FBC62B0 GPR24: 00000000 00000000 40000000 007FFF7D 007FFF00 C02A0000 C0265B00 C02A28F0 Call trace: [c0004a40] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] [c0004c7c] Kernel panic - not syncing: Attempted to kill the idle task! <0>Rebooting in 1 seconds..þ " Does anyone have an idea why this is happening and what am I doing wrong ? Thanks, Yigal Goldberger . |
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If I had to make a wild guess, I am assuming you are not using the correct locking mechanism around some shared resource. This line Code:
kernel BUG in preempt_schedule_irq at kernel/sched.c:3114! |
Hi David,
I'll be happy to provide you all you need in order to diagnose the problem, including the source code of the interrupt handler . I'm somewhat new to Linux and can't find the option for debug build , How is this done ? Thanks ! Yigal Goldberger. |
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kernel BUG in preempt_schedule_irq at kernel/sched.c:3114!
Hi David,
I've looked it up in the System.map file and the addresses correspond to the following : c0004c7c - __ipipe_ret_from_except c0004a40 - somewhere inside resume_kernel. I'm still stuck with this problem. Thanks in advance. Yigal. |
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