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    SubjectRe: [BUG] Linux 2.6.25-rc2 - Regression from 2.6.24-rc1-git1 softlockup while bootup on powerpc
    On Sat, Feb 16 2008, Kamalesh Babulal wrote:
    > Hi,
    >
    > The softlockup is seen from 2.6.25-rc1-git{1,3} and is visible in the 2.6.24-rc2 kernel,
    > While booting up with the 2.6.25-rc1-git{1,3} and 2.6.25-rc2 kernel(s) on the powerbox
    >
    > Loading st.ko module
    > BUG: soft lockup - CPU#1 stuck for 61s! [insmod:379]
    > NIP: c0000000001b0620 LR: c0000000001a5dcc CTR: 0000000000000040
    > REGS: c00000077caab8a0 TRAP: 0901 Not tainted (2.6.25-rc2-autotest)
    > MSR: 8000000000009032 <EE,ME,IR,DR> CR: 84004088 XER: 20000000
    > TASK = c00000077cb450a0[379] 'insmod' THREAD: c00000077caa8000 CPU: 1
    > GPR00: c00000077c9d4000 c00000077caabb20 c000000000538a40 000000000000000b
    > GPR04: ffc0000000000000 c00000077e0c0000 0000000000000036 000000000000000a
    > GPR08: 0040000000000000 c00000077c9d4250 c000000000000000 0000000000000000
    > GPR12: c00000077c9d4230 c000000000481d00
    > NIP [c0000000001b0620] .radix_tree_gang_lookup+0x100/0x1e4
    > LR [c0000000001a5dcc] .call_for_each_cic+0x50/0x10c
    > Call Trace:
    > [c00000077caabb20] [c0000000001a5e2c] .call_for_each_cic+0xb0/0x10c (unreliable)
    > [c00000077caabc60] [c00000000019dba4] .exit_io_context+0xf0/0x110
    > [c00000077caabcf0] [c000000000061e38] .do_exit+0x820/0x850
    > [c00000077caabda0] [c000000000061f34] .do_group_exit+0xcc/0xe8
    > [c00000077caabe30] [c00000000000872c] syscall_exit+0x0/0x40
    > Instruction dump:
    > 7d296214 39290018 e8090000 7caa2038 39290008 2fa00000 409e0018 7caa4215
    > 396b0001 418200cc 424000b8 4bffffdc <79691f24> 7d296214 e9690018 2fab0000

    It's odd stuff. Could you perhaps try and add some printks to
    block/cfq-iosched.c:call_for_each_cic(), like dumping the 'nr' return
    from radix_tree_gang_lookup() and the pointer value of cics[i] in the
    for() loop after the lookup?

    How many SCSI devices are online?

    --
    Jens Axboe



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