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    SubjectRe: 2.6.21-mm1
    On 06/05/07 21:54, Andrew Morton wrote:
    > On Sun, 06 May 2007 21:36:32 +0100 Simon Arlott <simon@fire.lp0.eu> wrote:
    >
    >> On 05/05/07 09:49, Andrew Morton wrote:
    >>> ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21/2.6.21-mm1/
    >> Not sure exactly what's going on here, but it happened with a lock held on my
    >> (XFS) filesystem while compiling part of the kernel because I can't do anything
    >> with it now.
    >>
    >> [ 1128.122000] BUG: sleeping function called from invalid context at block/cfq-iosched.c:1895
    >> [ 1128.122000] in_atomic():1, irqs_disabled():0
    >> [ 1128.122000] INFO: lockdep is turned off.
    >> [ 1128.122000] BUG: unable to handle kernel paging request at virtual address 8b0c4034
    >> [ 1128.122000] printing eip:
    >> [ 1128.122000] b0104e36
    >> [ 1128.123000] *pde = 00000000
    >> [ 1128.123000] Oops: 0000 [#1]
    >> [ 1128.123000] PREEMPT
    >> [ 1128.123000] Modules linked in: drbd mt352 saa7134_dvb dvb_pll video_buf_dvb dvb_core
    >> [ 1128.123000] CPU: 0
    >> [ 1128.123000] EIP: 0060:[<b0104e36>] Not tainted VLI
    >> [ 1128.123000] EFLAGS: 00010246 (2.6.21-git #195)
    >> [ 1128.123000] EIP is at dump_trace+0x66/0xb0
    >> [ 1128.123000] eax: 00000000 ebx: b18f6fd0 ecx: b06323ec edx: b05afc71
    >> [ 1128.123000] esi: 8b0c4000 edi: 8b0c4ffd ebp: b18f6fd0 esp: b18f6fb8
    >> [ 1128.123000] ds: 007b es: 007b fs: 0000 gs: 0000 ss: 0068
    >> [ 1128.123000] Process pdflush (pid: 186, ti=b18f6000 task=eff88b10 task.ti=b18f7000)
    >> [ 1128.123000] Stack: b000205d 00000000 fffffffc b05b9937 efd1adb4 00000010 b18f6ff0 b0104f3a
    >> [ 1128.123000] b06323ec b05b9937 00000000 b05d33e6 efd1adb4 b05d33e6 b18f7000 b0104f62
    >> [ 1128.123000] b05b9937 b18f700c
    >> [ 1128.123000] Call Trace:
    >> [ 1128.123000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30
    >> [ 1128.123000] [<b0104ffb>] show_stack_log_lvl+0x8b/0xb0
    >> [ 1128.123000] [<b0105243>] show_registers+0x1c3/0x320
    >> [ 1128.123000] [<b0105525>] die+0x105/0x230
    >> [ 1128.123000] [<b011703f>] do_page_fault+0x2cf/0x5b0
    >> [ 1128.123000] [<b04eae3a>] error_code+0x6a/0x70
    >> [ 1128.123000] [<b0104f3a>] show_trace_log_lvl+0x1a/0x30
    >> [ 1128.123000] [<b0104f62>] show_trace+0x12/0x20
    >> [ 1128.123000] =======================
    >> [ 1128.123000] Code: 18 8b 4d 08 8b 45 0c 8b 53 04 ff 51 08 8b 03 39 d8 76 06 89 c3 39 f3 77 e4 8b 4d 08 ba 71 fc 5a b0 8b 45 0c ff 51 0c 85 c0 78 38 <8b> 76 34 85 f6 74 31 8d 76 00 e8 bb d7 00 00 eb b3 89 eb eb af
    >> [ 1128.123000] EIP: [<b0104e36>] dump_trace+0x66/0xb0 SS:ESP 0068:b18f6fb8
    >
    > Mess. Someone incorrectly called the IO scheduler under a spinlock (or
    > similar), CFQ tried to do a dump_stack(), but the dump_stack() code
    > exploded. Usually this happens when the x86_64 tree contains stacktrace
    > improvements, but the unwinder (at least) wasn't present in -mm1.
    >
    > How come those addresses are 0xb0......, btw? You're running a different
    > vm split?

    I'm using CONFIG_VMSPLIT_3G_OPT, yes.

    --
    Simon Arlott
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