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Subject: Re: 2.6.8.1-mm2
From: Nathan Lynch <nathanl@austin.ibm.com>
To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org, Srivatsa Vaddagiri <vatsa@in.ibm.com>,
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> +dont-sleep-after-were-out-of-task-list.patch
> 
>  CPU hotplug race fix

I don't mean to be a pain, but this patch does not fix the bug I
reported.  It is still occurring on i386 and ppc64 (and proc_pid_flush
now generates lots of might_sleep warnings).

kernel BUG in migration_call at kernel/sched.c:4044!
cpu 0x1: Vector: 700 (Program Check) at [c00000027c7cb640]
    pc: c00000000004e730: .migration_call+0x150/0x350
    lr: c00000000004e6f4: .migration_call+0x114/0x350
    sp: c00000027c7cb8c0
   msr: 8000000000029032
  current = 0xc00000027c3d0a40
  paca    = 0xc000000000434880
    pid   = 4657, comm = cpuonoff.pl
1:mon> t
[c00000027c7cb8c0] c00000000004e6d8 .migration_call+0xf8/0x350 (unreliable)
[c00000027c7cb970] c000000000067330 .notifier_call_chain+0x58/0x98
[c00000027c7cba00] c0000000000743ec .cpu_down+0x1e0/0x364
[c00000027c7cbae0] c0000000001fcd3c .store_online+0x68/0x70
[c00000027c7cbb60] c0000000001f86bc .sysdev_store+0x54/0x60
[c00000027c7cbbe0] c0000000000fef70 .flush_write_buffer+0x48/0x60
[c00000027c7cbc60] c0000000000fefe8 .sysfs_write_file+0x60/0x78
[c00000027c7cbcf0] c0000000000ac720 .vfs_write+0x10c/0x164
[c00000027c7cbd90] c0000000000ac874 .sys_write+0x58/0xa4
[c00000027c7cbe30] c000000000011e00 syscall_exit+0x0/0x18
--- Exception: c01 (System Call) at 000000000fe562f8
SP (ffffe390) is in userspace


Hopefully, I should have time to perform a bisection search this
weekend.

Nathan