On Sun, Feb 17, 2008 at 09:10:46AM +0530, Kamalesh Babulal wrote:
> To conform the patches causing the panic, I tested the 2.6.24.2 kernel with
> the futex-fix-init-order.patch and
> futex-runtime-enable-pi-and-robust-functionality.patch applied and they seem
> to cause the kernel
> panic.
>
> Unable to handle kernel pointer dereference at virtual kernel address
> 0000000000
> 000000
> Oops: 0004 #1¨ SMP
> Modules linked in:
> CPU: 0 Not tainted 2.6.25-rc2-mm1-autotest #1
> Process swapper (pid: 1, task: 000000003f830000, ksp: 000000003f83ba48)
> Krnl PSW : 0704a00180000000 000000000024b2be
> (futex_atomic_cmpxchg_std+0x12/0x28
> )
> R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:2 CC:2 PM:0 EA:3
> Krnl GPRS: 0000000000000074 00000000fffffff2 0000000000000000 0000000000000000
> 0000000000000000 0000000000000001 0000000000000000 00000000004d0764
> 0000000000000000 00000000004d8768 0000000000000000 000000003f83bdb0
> 0000000000000040 0000000000343950 00000000000627e4 000000003f83bdb0
> Krnl Code: 000000000024b2b2: b90400bf lgr %r11,%r15
> 000000000024b2b6: a718fff2 lhi %r1,-14
> 000000000024b2ba: b2790100 sacf 256
> >000000000024b2be: ba342000 cs %r3,%r4,0(%r2)
> 000000000024b2c2: 1813 lr %r1,%r3
> 000000000024b2c4: b2790000 sacf 0
> 000000000024b2c8: b9140021 lgfr %r2,%r1
> 000000000024b2cc: e3b0b0700004 lg %r11,112(%r11)
> Call Trace:
> (<000000003f83bda8>¨ 0x3f83bda8)
> <00000000004bdeec>¨ init+0x30/0x104
> <00000000004b0c40>¨ kernel_init+0x1e0/0x370
> <000000000001a5c6>¨ kernel_thread_starter+0x6/0xc
> <000000000001a5c0>¨ kernel_thread_starter+0x0/0xc
>
> <4>--- end trace 561bb236c800851f ¨---
> note: swapper1¨ exited with preempt_count 1
> Kernel panic - not syncing: Attempted to kill init!
Thanks for reporting! Patch below should fix it.
Index: linux-2.6/arch/s390/lib/uaccess_std.c
===================================================================
--- linux-2.6.orig/arch/s390/lib/uaccess_std.c
+++ linux-2.6/arch/s390/lib/uaccess_std.c
@@ -293,8 +293,8 @@ int futex_atomic_cmpxchg_std(int __user
asm volatile(
" sacf 256\n"
- " cs %1,%4,0(%5)\n"
- "0: lr %0,%1\n"
+ "0: cs %1,%4,0(%5)\n"
+ " lr %0,%1\n"
"1: sacf 0\n"
EX_TABLE(0b,1b)
: "=d" (ret), "+d" (oldval), "=m" (*uaddr)
--
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