* Ingo Molnar <mingo@xxxxxxx> wrote:
* Ingo Molnar <mingo@xxxxxxx> wrote:
managed to bisect one of the boot crashes i've been seeing:Cc:-ed more folks - it's either the percpu changes or the APIC changes (both occured at about the same time). Or maybe something from upstream.tip/master. It looks like this appeared since -rc1. Mu current suspicion is the percpu changes, since I'm seeing some other strange symptoms.Call Trace:Hmmm... Mysterious, as you seem to be using classic RCU, which hasn't
[<ffffffff80238c1f>] __schedule_bug+0x62/0x66
[<ffffffff80211d2d>] ? retint_restore_args+0x5/0x20
[<ffffffff80503921>] __schedule+0x95/0x792
[<ffffffff802093aa>] ? _stext+0x3aa/0x1000
[<ffffffff802093aa>] ? _stext+0x3aa/0x1000
[<ffffffff805040c2>] schedule+0xe/0x22
[<ffffffff8020ff04>] cpu_idle+0x70/0x72
[<ffffffff804fc3a0>] cpu_bringup_and_idle+0x13/0x15
Creating initial device nodes
Setting up hotplug.
From what I can see, softirq 8 is the RCU softirq. I don't know if the "scheduling while atomic" is related or not, but its two new schedulerish symptoms appearing at once, so I think its likely they're related.
changed in awhile. Which branch of the tip tree are you using?
a698c823e15149941b0f0281527d0c0d1daf2639 is first bad commit
commit a698c823e15149941b0f0281527d0c0d1daf2639
Author: Tejun Heo <tj@xxxxxxxxxx>
Date: Tue Jan 13 20:41:35 2009 +0900
x86: make vmlinux_32.lds.S use PERCPU() macro
Make vmlinux_32.lds.S use the generic PERCPU() macro instead of open
coding it. This will ease future changes.
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
# bad: [b16884e8] Merge branch 'x86/urgent'
# good: [f2257b70] Merge git://git.kernel.org/pub/scm/linux/kernel/gi
# good: [345fa66b] Merge branch 'core/locking'
# bad: [f534caca] Merge branch 'oprofile'
# bad: [3eb3963f] Merge branch 'cpus4096' into core/percpu
# bad: [1b437c8c] x86-64: Move irq stats from PDA to per-cpu and con
# good: [54da5b3d] x86: fix broken flush_tlb_others_ipi(), fix
# good: [c2c21745] x86: replacing mp_config_intsrc with mpc_intsrc
# bad: [c8f3329a] x86: use static _cpu_pda array
# good: [7de6883f] x86: fix pda_to_op()
# bad: [a698c823] x86: make vmlinux_32.lds.S use PERCPU() macro
# good: [c90aa894] x86: cleanup early setup_percpu references
testing the revert now.
This might be similar to the other 32-bit linker bug that was tracked down yesterday and reverted - maybe that revert unearthed a problem with this commit?
seems to do the trick.
Tejun, a detail, this config has:
CONFIG_RELOCATABLE=y
Have you considered 32-bit relocatable kernels too? Config attached.