From: Jack Steiner <steiner@sgi.com>
To: venkatesh.pallipadi@intel.com, suresh.b.siddha@intel.com
Cc: mingo@elte.hu, tglx@linutronix.de, linux-kernel@vger.kernel.org
Subject: Panic in reserve_memtype()
Date: Wed, 24 Feb 2010 14:22:58 -0600 [thread overview]
Message-ID: <20100224202258.GA615@sgi.com> (raw)
We see an X86_64 regression that started a few days ago. The kernel is booted
via EFI & panics in the pat.c code trying to deref a NULL pointer.
I didn't debug the problem but am suspicious of
x86, pat: Migrate to rbtree only backend for pat memtype management x86/pat
author Pallipadi, Venkatesh <venkatesh.pallipadi@intel.com>
Wed, 10 Feb 2010 23:26:07 +0000 (15:26 -0800)
committer H. Peter Anvin <hpa@zytor.com>
Thu, 18 Feb 2010 23:41:36 +0000 (15:41 -0800)
Has anyone seen this? If not, I can debug further....
Problem is in the git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git tree.
Pid: 0, comm: swapper Not tainted 2.6.33-rc8-tip-medusa+ #2 /
RIP: 0010:[<ffffffff810304b0>] [<ffffffff810304b0>] rbt_memtype_check_insert+0x1b2/0x232
RSP: 0000:ffffffff81601df8 EFLAGS: 00000256
RAX: 00000000000b0000 RBX: ffff88000f840100 RCX: 00000000000001c1
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88000f8244c0
RBP: ffffffff81601e38 R08: 0000000000000001 R09: ffffffff8152cd79
R10: ffffffff8152cd79 R11: 0000000000018620 R12: ffff88000f8244c0
R13: 0000000000000010 R14: 0000000000000000 R15: 00000000fffffff4
FS: 0000000000000000(0000) GS:ffff880001c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005007b
CR2: 0000000000000000 CR3: 0000000001604000 CR4: 00000000000006b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 0000000000000000 DR7: 0000000000000000
Process swapper (pid: 0, threadinfo ffffffff81600000, task ffffffff8160c020)
Stack:
ffffffff81601e38 00000000000b0000 0000000000006000 ffff88000f840100
<0> ffff88000f8244c0 0000000000000000 0000000000000010 00000000fffffff4
<0> ffffffff81601e88 ffffffff8102edff 00000000000b0000 0000000000006000
Call Trace:
[<ffffffff8102edff>] reserve_memtype+0x2ce/0x4c9
[<ffffffff8102e0d0>] set_memory_uc+0x41/0x89
[<ffffffff816b92be>] efi_enter_virtual_mode+0xc9/0x269
[<ffffffff816aada0>] start_kernel+0x3b8/0x42b
[<ffffffff816aa140>] ? early_idt_handler+0x0/0x71
[<ffffffff816aa29e>] x86_64_start_reservations+0xa5/0xa9
[<ffffffff816aa3ed>] x86_64_start_kernel+0x14b/0x15a
Source of the NULL pointer is:
int set_memory_uc(unsigned long addr, int numpages)
{
...
ret = reserve_memtype(__pa(addr), __pa(addr) + numpages * PAGE_SIZE,
_PAGE_CACHE_UC_MINUS, NULL);
--- jack
next reply other threads:[~2010-02-24 20:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-24 20:22 Jack Steiner [this message]
2010-02-24 21:09 ` Panic in reserve_memtype() Pallipadi, Venkatesh
2010-02-24 21:37 ` Jack Steiner
2010-02-24 21:43 ` Pallipadi, Venkatesh
2010-02-24 22:05 ` Jack Steiner
2010-03-01 15:11 ` Jack Steiner
2010-03-01 17:55 ` Pallipadi, Venkatesh
2010-03-01 23:21 ` [tip:x86/pat] x86, pat: In rbt_memtype_check_insert(), update new->type only if valid tip-bot for Pallipadi, Venkatesh
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