Messages in this thread |  | | Date | Fri, 28 Sep 2001 10:23:17 -0700 | From | "Martin J. Bligh" <> | Subject | Adding a printk in start_secondary breaks 2.4.10, not 2.4.9 ?? |
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If I add a couple of printks to the latter part of start_secondary on 2.4.10, and I enable serial console, I get a garbled panic. This worked fine on 2.4.9 - can anyone give me any idea why it broke on 2.4.10?
This is error is on a normal SMP box, not just a NUMA system with wierd patches ;-)
(I need the printks for some arcane and disgusting reasons. Without them, the multiquad NUMA machines die with an undiagnosable BINT error - I have no idea why ... maybe the console_lock serialises some action of the procs?)
Thanks,
Martin.
The patch ========
int __init start_secondary(void *unused) { /* * Dont put anything before smp_callin(), SMP * booting is too fragile that we want to limit the * things done here to the most necessary things. */ cpu_init(); smp_callin(); while (!atomic_read(&smp_commenced)) rep_nop(); /* * low-memory mappings have been cleared, flush them from * the local TLBs too. */ + printk("Before tlbflush - processor: \n"); local_flush_tlb(); + printk("After tlbflush - processor: \n");
return cpu_idle(); }
The panic ========
Before tlbf2.4 -Based upon Swansea University C- processor: 6 NBT3.039 bUnable to hcessor: 7 l NULL pointer dereferencer at virtual address 00000050 .10 enting eip: 2c0114214 us=2 = 00000000 cOops: 0000 type 1 1 I: Probing010:[<ardware ] CI: SeaS: 000 for i450NX host bridges on 00:10.0 Unknown00000040 edx: c025b440 nesi: c0279550 edi: 00000IRQ transform: 5f1c ,P0) -> 23 0 Ids: 0018PPB(B1,I12,P ) to get irqPr0 sPCIwapper (pid: 1, form: (B2,I4,P0) -> 40 StPCI: u000002PB(Bc02795P1) to get irqffffffff -fffIC IRQ 00000040 : (B2,260 1) -> 39 P CI: PP00000002,00000002 t irq 302 0PCI->APICf7ee6000 sform: (B2,f7ee2) - f7ef5f28 usi Bc0115,P3) t7ee4000 qf7e 4000 -c0PIC IR transfor :f7ef5fac 3c0105000 f7ef5f70 s[10Cal101f] for [<c0115a28>] [<c0116be7>rat[<c0105000>] I[<c01059faAfter tlbflush - proc so 2 011bad8>] [<c0105000>] [<c0105626>] [<c011bad8>] [<c010507d>] [<c0105000>] [<c010562f>]
Code: 8b 4f 50 89 4d dc 8b 5d d0 8b 4d fc 89 5d d8 8b 41 28 a8 10 <0>Kernel panic: Attempted to kill init!
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