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Date: Mon, 2 Aug 2004 15:19:07 +0530
From: Dipankar Sarma <dipankar@in.ibm.com>
To: V Srivatsa <vatsa@in.ibm.com>, nathanl@in.ibm.com
Cc: Joel Schopp <jschopp@austin.ibm.com>,
       Rusty Russell <rusty@rustcorp.com.au>, linux-kernel@vger.kernel.org,
       nickp@in.ibm.com
Subject: CPU hotplug broken in 2.6.8-rc2 ?
Message-ID: <20040802094907.GA3945@in.ibm.com>
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Could it be that recent sched domain stuff broke CPU hotplug ?
While testing cpu hotplug with some RCU changes, I got the following
panic (while onlining).

Thanks
Dipankar

cpu 0x2: Vector: 380 (Data SLB Access) at [c00000000152f4a0]
    pc: c00000000004b1b0: .find_busiest_group+0x274/0x464
    lr: c00000000004b0e4: .find_busiest_group+0x1a8/0x464
    sp: c00000000152f720
   msr: 8000000000001032
   dar: 10
  current = 0xc000000001520040
  paca    = 0xc000000000535200
    pid   = 0, comm = swapper
enter ? for help
2:mon>

2:mon> t
[c00000000152f720] c000000000654f30 (unreliable)
[c00000000152f830] c00000000004b4cc .rebalance_tick+0x12c/0x2d4
[c00000000152f920] c00000000005b954 .update_process_times+0xc4/0x154
[c00000000152f9c0] c0000000000385e8 .smp_local_timer_interrupt+0x3c/0x58
[c00000000152fa30] c000000000015088 .timer_interrupt+0x11c/0x3fc
[c00000000152fb10] c00000000000a2b4 Decrementer_common+0xb4/0x100
--- Exception: 901 (Decrementer) at c000000000013bc0 .default_idle+0x70/0x110
[c00000000152fe90] c0000000000139e4 .cpu_idle+0x38/0x50
[c00000000152ff00] c000000000038e18 .start_secondary+0xfc/0x150
[c00000000152ff90] c00000000000bf20 .enable_64b_mode+0x0/0x28
                                                                                
2:mon> r
R00 = 000000000000002b   R16 = 0000000000000040
R01 = c00000000152f720   R17 = 0000000000000180
R02 = c0000000006d6d40   R18 = 0000000000000040
R03 = 0000000000000020   R19 = c000000000828e08
R04 = 0000000000000020   R20 = 0000000000000002
R05 = 0000000000000002   R21 = 0000000000000000
R06 = c00000000073f9b0   R22 = 0000000000000000
R07 = 000000000000000b   R23 = c00000000152f790
R08 = c0000000006fc728   R24 = c0000000006d5008
R09 = 0000000000000015   R25 = c000000000529c38
R10 = 0000000000000000   R26 = c000000000529c38
R11 = 0000000000000080   R27 = c00000000073f9b0
R12 = 0000000028282482   R28 = 0000000000000001
R13 = c000000000535200   R29 = 0000000000000015
R14 = c00000000073f980   R30 = c0000000005bbe00
R15 = 0000000000000000   R31 = c00000000152f720
pc  = c00000000004b1b0 .find_busiest_group+0x274/0x464
lr  = c00000000004b0e4 .find_busiest_group+0x1a8/0x464
msr = 8000000000001032   cr  = 28282488
ctr = c000000000013b50   xer = 0000000000000000   trap =      380